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Surface Mount RF Schottky Barrier Diodes Technical Data
HSMS-282x Series
Features
* Low Turn-On Voltage (As Low as 0.34 V at 1 mA) * Low FIT (Failure in Time) Rate* * Six-sigma Quality Level * Single, Dual and Quad Versions * Unique Configurations in Surface Mount SOT-363 Package
Package Lead Code Identification, SOT-23/SOT-143 (Top View) COMMON COMMON
SINGLE 3 SERIES 3 ANODE 3 CATHODE 3
1
#0
2
1
#2
2
1
#3
2
1
#4
2
UNCONNECTED PAIR 3 4
RING QUAD 3 4
BRIDGE QUAD 3 4
CROSS-OVER QUAD 3 4
- increase flexibility - save board space - reduce cost
* HSMS-282K Grounded Center Leads Provide up to 10 dB Higher Isolation * Matched Diodes for Consistent Performance * Better Thermal Conductivity for Higher Power Dissipation
1
#5
2
1
#7
2
1
#8
2
1
#9
2
Package Lead Code Identification, SOT-323 (Top View)
SINGLE SERIES
Package Lead Code Identification, SOT-363 (Top View)
HIGH ISOLATION UNCONNECTED PAIR
6 5 4
UNCONNECTED TRIO
6 5 4
* Lead-free Option Available * For more information see the Surface Mount Schottky Reliability Data Sheet.
B COMMON ANODE
C COMMON CATHODE
1
2
3
K COMMON CATHODE QUAD
6 5 4
1
2
3
L COMMON ANODE QUAD
6 5 4
E
F
1 2
Description/Applications
These Schottky diodes are specifically designed for both analog and digital applications. This series offers a wide range of specifications and package configurations to give the designer wide flexibility. Typical applications of these Schottky diodes are mixing, detecting, switching, sampling, clamping,
and wave shaping. The HSMS-282x series of diodes is the best all-around choice for most applications, featuring low series resistance, low forward voltage at all current levels and good RF characteristics. Note that Agilent's manufacturing techniques assure that dice found in pairs and quads are taken from adjacent sites on the wafer, assuring the highest degree of match.
M
3
1
2
N
3
BRIDGE QUAD
6 5 4 6
RING QUAD
5
4
1
2
P
3
1
2
R
3
2
Pin Connections and Package Marking
1 2 3 6 5 4
Absolute Maximum Ratings[1] TC = 25C
Symbol Parameter If PIV Tj Tstg jc Forward Current (1 s Pulse) Peak Inverse Voltage Junction Temperature Storage Temperature Thermal Resistance[2] Unit SOT-23/SOT-143 SOT-323/SOT-363 Amp V C C C/W 1 15 150 -65 to 150 500 1 15 150 -65 to 150 150
Notes: 1. Package marking provides orientation and identification. 2. See "Electrical Specifications" for appropriate package marking.
Electrical Specifications TC = 25C, Single Diode[4]
Part Package Number Marking Lead HSMS[5] Code Code 2820 2822 2823 2824 2825 2827 2828 2829 282B 282C 282E 282F 282K 282L 282M 282N 282P 282R C0[3] C2[3] C3[3] C4[3] C5[3] C7[3] C8[3] C9[3] C0[7] C2[7] C3[7] C4[7] CK[7] CL[7] HH[7] NN[7] CP[7] OO[7] 0 2 3 4 5 7 8 9 B C E F K L M N P R Minimum Maximum Breakdown Forward Voltage Voltage VBR (V) VF (mV) 15 340 Maximum Forward Voltage VF (V) @ IF (mA) 0.5 10 Maximum Reverse Typical Leakage Maximum Dynamic IR (nA) @ Capacitance Resistance VR (V) CT (pF) RD () [6] 100 1 1.0 12
Test Conditions
Notes: 1. VF for diodes in pairs and quads in 15 mV maximum at 1 mA. 2. C TO for diodes in pairs and quads is 0.2 pF maximum. 3. Package marking code is in white. 4. Effective Carrier Lifetime () for all these diodes is 100 ps maximum measured with Krakauer method at 5 mA. 5. See section titled "Quad Capacitance." 6. R D = R S + 5.2 at 25C and I f = 5 mA. 7. Package marking code is laser marked.
GUx
Notes: 1. Operation in excess of any one of these conditions may result in permanent damage to the device. 2. TC = +25C, where TC is defined to be the temperature at the package pins where contact is made to the circuit board.
Configuration Single Series Common Anode Common Cathode Unconnected Pair Ring Quad[5] Bridge Quad[5] Cross-over Quad Single Series Common Anode Common Cathode High Isolation Unconnected Pair Unconnected Trio Common Cathode Quad Common Anode Quad Bridge Quad Ring Quad
IR = 100 A IF = 1 mA[1]
VF = 0 V f = 1 MHz[2]
IF = 5 mA
3
Quad Capacitance
Capacitance of Schottky diode quads is measured using an HP4271 LCR meter. This instrument effectively isolates individual diode branches from the others, allowing accurate capacitance measurement of each branch or each diode. The conditions are: 20 mV R.M.S. voltage at 1 MHz. Agilent defines this measurement as "CM", and it is equivalent to the capacitance of the diode by itself. The equivalent diagonal and adjacent capacitances can then be calculated by the formulas given below.
In a quad, the diagonal capacitance is the capacitance between points A and B as shown in the figure below. The diagonal capacitance is calculated using the following formula C1 x C2 C3 x C4 CDIAGONAL = _______ + _______ C1 + C2 C3 + C4
A C1 C C2 C4 B C3
The equivalent adjacent capacitance is the capacitance between points A and C in the figure below. This capacitance is calculated using the following formula 1 CADJACENT = C1 + ____________ 11 1 -- + -- + -- C2 C3 C4 This information does not apply to cross-over quad diodes.
Linear Equivalent Circuit Model Diode Chip
Rj RS
SPICE Parameters
Parameter Units BV CJ0 EG IBV IS N RS PB PT M V pF eV A A V HSMS-282x 15 0.7 0.69 1E - 4 2.2E - 8 1.08 6.0 0.65 2 0.5
Cj
RS = series resistance (see Table of SPICE parameters) C j = junction capacitance (see Table of SPICE parameters) Rj = 8.33 X 10-5 nT Ib + Is
where Ib = externally applied bias current in amps Is = saturation current (see table of SPICE parameters) T = temperature, K n = ideality factor (see table of SPICE parameters) Note: To effectively model the packaged HSMS-282x product, please refer to Application Note AN1124.
ESD WARNING: Handling Precautions Should Be Taken To Avoid Static Discharge.
4
Typical Performance, TC = 25C (unless otherwise noted), Single Diode
100
I F - FORWARD CURRENT (mA)
C T - CAPACITANCE (pF)
I R - REVERSE CURRENT (nA)
10
TA = +125C TA = +75C TA = +25C TA = -25C
100,000
1
10,000
0.8
1000
0.6
1
100
0.4
0.1
10 1 0 5
0.01 0 0.10 0.20 0.30 0.40 0.50 VF - FORWARD VOLTAGE (V)
TA = +125C TA = +75C TA = +25C 10 15
0.2 0 0 2 4 6 8 VR - REVERSE VOLTAGE (V)
VR - REVERSE VOLTAGE (V)
Figure 1. Forward Current vs. Forward Voltage at Temperatures.
Figure 2. Reverse Current vs. Reverse Voltage at Temperatures.
Figure 3. Total Capacitance vs. Reverse Voltage.
VF - FORWARD VOLTAGE DIFFERENCE (mV)
1000
30
30
100
1.0
10
IF (Left Scale)
10
100
IF (Left Scale) 10
10
1
VF (Right Scale)
1
VF (Right Scale)
1 0.1
1
10
100
0.3 0.2
0.4
0.6
0.8
1.0
1.2
0.3 1.4
1 0.10
0.15
0.20
0.1 0.25
I F - FORWARD CURRENT (mA)
VF - FORWARD VOLTAGE (V)
VF - FORWARD VOLTAGE (V)
Figure 4. Dynamic Resistance vs. Forward Current.
Figure 5. Typical Vf Match, Series Pairs and Quads at Mixer Bias Levels.
Figure 6. Typical Vf Match, Series Pairs at Detector Bias Levels.
1
10 10
VO - OUTPUT VOLTAGE (V)
VO - OUTPUT VOLTAGE (V)
DC bias = 3 A 0.1
-25C +25C +75C
0.1 0.01
+25C
CONVERSION LOSS (dB)
1
9
8
0.01
RF in 18 nH HSMS-282B Vo 3.3 nH 100 pF 100 K 0
0.001 0.0001 1E-005 -20
RF in 68
HSMS-282B
Vo
100 pF
7
4.7 K 20 30 6 0 2 4 6 8 10 12 LOCAL OSCILLATOR POWER (dBm)
0.001 -40
-30
-20
-10
-10
0
10
Pin - INPUT POWER (dBm)
Pin - INPUT POWER (dBm)
Figure 7. Typical Output Voltage vs. Input Power, Small Signal Detector Operating at 850 MHz.
Figure 8. Typical Output Voltage vs. Input Power, Large Signal Detector Operating at 915 MHz.
Figure 9. Typical Conversion Loss vs. L.O. Drive, 2.0 GHz (Ref AN997).
VF - FORWARD VOLTAGE DIFFERENCE (mV)
RD - DYNAMIC RESISTANCE ()
IF - FORWARD CURRENT (mA)
IF - FORWARD CURRENT (A)
5
Applications Information
Product Selection Agilent's family of surface mount Schottky diodes provide unique solutions to many design problems. Each is optimized for certain applications. The first step in choosing the right product is to select the diode type. All of the products in the HSMS-282x family use the same diode chip - they differ only in package configuration. The same is true of the HSMS-280x, -281x, 285x, -286x and -270x families. Each family has a different set of characteristics, which can be compared most easily by consulting the SPICE parameters given on each data sheet. The HSMS-282x family has been optimized for use in RF applications, such as DC biased small signal detectors to 1.5 GHz. Biased or unbiased large signal detectors (AGC or power monitors) to 4 GHz. Mixers and frequency multipliers to 6 GHz.
need very low flicker noise. The HSMS-285x is a family of zero bias detector diodes for small signal applications. For high frequency detector or mixer applications, use the HSMS-286x family. The HSMS-270x is a series of specialty diodes for ultra high speed clipping and clamping in digital circuits. Schottky Barrier Diode Characteristics Stripped of its package, a Schottky barrier diode chip consists of a metal-semiconductor barrier formed by deposition of a metal layer on a semiconductor. The most common of several different types, the passivated diode, is shown in Figure 10, along with its equivalent circuit. RS is the parasitic series resistance of the diode, the sum of the bondwire and leadframe resistance, the resistance of the bulk layer of silicon, etc. RF energy coupled into RS is lost as heat--it does not contribute to the rectified output of the diode. CJ is parasitic junction capacitance of the diode, controlled by the thickness of the epitaxial layer and the diameter of the Schottky contact. Rj is the junction resistance of the diode, a function of the total current flowing through it.
8.33 X 10-5 n T R j = ------------ = R V - R s IS + I b 0.026 ----- at 25C IS + I b where n = ideality factor (see table of SPICE parameters) T = temperature in K IS = saturation current (see table of SPICE parameters) Ib = externally applied bias current in amps Rv = sum of junction and series resistance, the slope of the V-I curve IS is a function of diode barrier height, and can range from picoamps for high barrier diodes to as much as 5 A for very low barrier diodes. The Height of the Schottky Barrier The current-voltage characteristic of a Schottky barrier diode at room temperature is described by the following equation: I = IS (e
S -----
V - IR 0.026
- 1)
The other feature of the HSMS-282x family is its unit-to-unit and lot-to-lot consistency. The silicon chip used in this series has been designed to use the fewest possible processing steps to minimize variations in diode characteristics. Statistical data on the consistency of this product, in terms of SPICE parameters, is available from Agilent. For those applications requiring very high breakdown voltage, use the HSMS-280x family of diodes. Turn to the HSMS-281x when you
N-TYPE OR P-TYPE SILICON SUBSTRATE
;;
METAL
PASSIVATION N-TYPE OR P-TYPE EPI
On a semi-log plot (as shown in the Agilent catalog) the current graph will be a straight line with inverse slope 2.3 X 0.026 = 0.060 volts per cycle (until the effect of
RS
PASSIVATION LAYER
SCHOTTKY JUNCTION
Cj
Rj
CROSS-SECTION OF SCHOTTKY BARRIER DIODE CHIP
EQUIVALENT CIRCUIT
Figure 10. Schottky Diode Chip.
6
RS is seen in a curve that droops at high current). All Schottky diode curves have the same slope, but not necessarily the same value of current for a given voltage. This is determined by the saturation current, IS, and is related to the barrier height of the diode. Through the choice of p-type or n-type silicon, and the selection of metal, one can tailor the characteristics of a Schottky diode. Barrier height will be altered, and at the same time CJ and RS will be changed. In general, very low barrier height diodes (with high values of IS, suitable for zero bias applications) are realized on p-type silicon. Such diodes suffer from higher values of RS than do the n-type. Thus, p-type diodes are generally reserved for detector applications (where very high values of RV swamp out high RS) and n-type diodes such as the HSMS-282x are used for mixer applications (where high L.O. drive levels keep RV low). DC biased detectors and self-biased detectors used in gain or power control circuits. Detector Applications Detector circuits can be divided into two types, large signal (Pin > -20 dBm) and small signal (Pin < -20 dBm). In general, the former use resistive impedance matching at the input to improve flatness over frequency -- this is possible since the input signal levels are high enough to produce adequate output voltages without the need for a high Q reactive input matching network. These circuits are self-biased (no external DC bias) and are used for gain and power control of amplifiers.
Small signal detectors are used as very low cost receivers, and require a reactive input impedance matching network to achieve adequate sensitivity and output voltage. Those operating with zero bias utilize the HSMS285x family of detector diodes. However, superior performance over temperature can be achieved with the use of 3 to 30 A of DC bias. Such circuits will use the HSMS-282x family of diodes if the operating frequency is 1.5 GHz or lower. Typical performance of single diode detectors (using HSMS-2820 or HSMS-282B) can be seen in the transfer curves given in Figures 7 and 8. Such detectors can be realized either as series or shunt circuits, as shown in Figure 11.
DC Bias
The two diodes are in parallel in the RF circuit, lowering the input impedance and making the design of the RF matching network easier. The two diodes are in series in the output (video) circuit, doubling the output voltage. Some cancellation of even-order harmonics takes place at the input.
DC Bias
Zero Biased Diodes
DC Biased Diodes
Figure 12. Voltage Doubler.
The most compact and lowest cost form of the doubler is achieved when the HSMS-2822 or HSMS-282C series pair is used. Both the detection sensitivity and the DC forward voltage of a biased Schottky detector are temperature sensitive. Where both must be compensated over a wide range of temperatures, the differential detector[2] is often used. Such a circuit requires that the detector diode and the reference diode exhibit identical characteristics at all DC bias levels and at all temperatures. This is accomplished through the use of two diodes in one package, for example the HSMS-2825 in Figure 13. In the Agilent assembly facility, the two dice in a surface mount package are taken from adjacent sites on the wafer (as illustrated in Figure 14). This
Shunt inductor provides video signal return Shunt diode provides video signal return
DC Bias
Zero Biased Diodes
DC Biased Diodes
Figure 11. Single Diode Detectors.
The series and shunt circuits can be combined into a voltage doubler[1], as shown in Figure 12. The doubler offers three advantages over the single diode circuit.
[1] [2]
Agilent Application Note 956-4, "Schottky Diode Voltage Doubler."
Raymond W. Waugh, "Designing Large-Signal Detectors for Handsets and Base Stations," Wireless Systems Design, Vol. 2, No. 7, July 1997, pp 42 - 48.
7
assures that the characteristics of the two diodes are more highly matched than would be possible through individual testing and hand matching.
bias
detector diode PA Vbias
bias
differential amplifier
HSMS-282K reference diode to differential amplifier
differential amplifier
matching network
HSMS-282P
Figure 15. High Power Differential Detector.
Figure 17. Voltage Doubler Differential Detector.
matching network
HSMS-2825
Figure 13. Differential Detector.
The concept of the voltage doubler can be applied to the differential detector, permitting twice the output voltage for a given input power (as well as improving input impedance and suppressing second harmonics). However, care must be taken to assure that the two reference diodes closely match the two detector diodes. One possible configuration is given in Figure 16, using two HSMS-2825. Board space can be saved through the use of the HSMS-282P open bridge quad, as shown in Figure 17.
bias
While the differential detector works well over temperature, another design approach[3] works well for large signal detectors. See Figure 18 for the schematic and a physical layout of the circuit. In this design, the two 4.7 K resistors and diode D2 act as a variable power divider, assuring constant output voltage over temperature and improving output linearity.
RF in 68
D1
4.7 K 33 pF
Vo 4.7 K D2 68 33 pF
Figure 14. Fabrication of Agilent Diode Pairs.
In high power applications, coupling of RF energy from the detector diode to the reference diode can introduce error in the differential detector. The HSMS-282K diode pair, in the six lead SOT-363 package, has a copper bar between the diodes that adds 10 dB of additional isolation between them. As this part is manufactured in the SOT-363 package it also provides the benefit of being 40% smaller than larger SOT-143 devices. The HSMS-282K is illustrated in Figure 15 -- note that the ground connections must be made as close to the package as possible to minimize stray inductance to ground.
HSMS-2825 or HSMS-282K
RFin
HSMS-282K
differential amplifier
Vo 4.7 K
Figure 18. Temperature Compensated Detector.
HSMS-2825
matching network
HSMS-2825
Figure 16. Voltage Doubler Differential Detector.
In certain applications, such as a dual-band cellphone handset operating at both 900 and 1800 MHz, the second harmonics generated in the power control output detector when the handset is working at 900 MHz can cause problems. A filter at the output can reduce unwanted emissions at 1800 MHz in this case, but a
[3]
Hans Eriksson and Raymond W. Waugh, "A Temperature Compensated Linear Diode Detector," to be published.
8
lower cost solution is available[4]. Illustrated schematically in Figure 19, this circuit uses diode D2 and its associated passive components to cancel all even order harmonics at the detector's RF input. Diodes D3 and D4 provide temperature compensation as described above. All four diodes are contained in a single HSMS- 282R package, as illustrated in the layout shown in Figure 20.
Mixer applications The HSMS-282x family, with its wide variety of packaging, can be used to make excellent mixers at frequencies up to 6 GHz. The HSMS-2827 ring quad of matched diodes (in the SOT-143 package) has been designed for double balanced mixers. The smaller (SOT-363) HSMS-282R ring quad can similarly be used, if the quad is closed with external connections as shown in Figure 21.
RF in 68 D2 R3
D1
R1
V+ R2
HSMS-282R
V- C2 R4
C1 D3
LO in
RF in
A review of Figure 21 may lead to the question as to why the HSMS-282R ring quad is open on the ends. Distortion in double balanced mixers can be reduced if LO drive is increased, up to the point where the Schottky diodes are driven into saturation. Above this point, increased LO drive will not result in improvements in distortion. The use of expensive high barrier diodes (such as those fabricated on GaAs) can take advantage of higher LO drive power, but a lower cost solution is to use a eight (or twelve) diode ring quad. The open design of the HSMS-282R permits this to easily be done, as shown in Figure 23.
D4 C1 = C2 100 pF R1 = R2 = R3 = R4 = 4.7 K D1 & D2 & D3 & D4 = HSMS-282R
IF out
LO in
Figure 21. Double Balanced Mixer.
RF in
Figure 19. Schematic of Suppressed Harmonic Detector.
HSMS-282R 4.7 K V+ 100 pF 4.7 K
V-
100 pF
RF in
68
Both of these networks require a crossover or a three dimensional circuit. A planar mixer can be made using the SOT-143 crossover quad, HSMS-2829, as shown in Figure 22. In this product, a special lead frame permits the crossover to be placed inside the plastic package itself, eliminating the need for via holes (or other measures) in the RF portion of the circuit itself.
HSMS-2829
HSMS-282R
IF out
Figure 23. Low Distortion Double Balanced Mixer.
This same technique can be used in the single-balanced mixer. Figure 24 shows such a mixer, with two diodes in each spot normally occupied by one. This mixer, with a sufficiently high LO drive level, will display low distortion.
RF in 180 hybrid LO in HSMS-282R Low pass filter
Figure 20. Layout of Suppressed Harmonic Detector.
Note that the forgoing discussion refers to the output voltage being extracted at point V+ with respect to ground. If a differential output is taken at V+ with respect to V-, the circuit acts as a voltage doubler.
LO in
RF in
IF out
Figure 24. Low Distortion Balanced Mixer.
IF out
Figure 22. Planar Double Balanced Mixer.
[4]
Alan Rixon and Raymond W. Waugh, "A Suppressed Harmonic Power Detector for Dual Band `Phones," to be published.
9
Sampling Applications The six lead HSMS-282P can be used in a sampling circuit, as shown in Figure 25. As was the case with the six lead HSMS-282R in the mixer, the open bridge quad is closed with traces on the circuit board. The quad was not closed internally so that it could be used in other applications, such as illustrated in Figure 17.
sample point HSMS-282P
Note that jc, the thermal resistance from diode junction to the foot of the leads, is the sum of two component resistances, jc = pkg + chip (2)
sampling pulse
Package thermal resistance for the SOT-3x3 package is approximately 100C/W, and the chip thermal resistance for the HSMS-282x family of diodes is approximately 40C/W. The designer will have to add in the thermal resistance from diode case to ambient -- a poor choice of circuit board material or heat sink design can make this number very high. Equation (1) would be straightforward to solve but for the fact that diode forward voltage is a function of temperature as well as forward current. The equation for Vf is:
sampling circuit
Figure 25. Sampling Circuit.
Thermal Considerations The obvious advantage of the SOT-323 and SOT-363 over the SOT-23 and SOT-142 is combination of smaller size and extra leads. However, the copper leadframe in the SOT-3x3 has a thermal conductivity four times higher than the Alloy 42 leadframe of the SOT-23 and SOT-143, which enables the smaller packages to dissipate more power. The maximum junction temperature for these three families of Schottky diodes is 150C under all operating conditions. The following equation applies to the thermal analysis of diodes: Tj = (Vf If + PRF) jc + Ta (1)
Diode Burnout Any Schottky junction, be it an RF diode or the gate of a MESFET, is relatively delicate and can be burned out with excessive RF power. Many crystal video receivers used in RFID (tag) applications find themselves in poorly controlled environments where high power sources may be present. Examples are the areas around airport and FAA radars, nearby ham radio operators, the vicinity of a broadcast band transmitter, etc. In such environments, the Schottky diodes of the receiver can be protected by a device known as a limiter diode.[5] Formerly available only in radar warning receivers and other high cost electronic warfare applications, these diodes have been adapted to commercial and consumer circuits. Agilent offers a complete line of surface mountable PIN limiter diodes. Most notably, our HSMP4820 (SOT-23) can act as a very fast (nanosecond) power-sensitive switch when placed between the antenna and the Schottky diode, shorting out the RF circuit temporarily and reflecting the excessive RF energy back out the antenna.
I f = IS
11600 (Vf - If Rs) nT e -1
(3)
where n = ideality factor T = temperature in K Rs = diode series resistance and IS (diode saturation current) is given by
2 n 1 ( 1T - 298)
I s = I0
T ( 298)
- 4060
e
(4)
where Tj = junction temperature Ta = diode case temperature jc = thermal resistance V f I f = DC power dissipated P RF = RF power dissipated
Equation (4) is substituted into equation (3), and equations (1) and (3) are solved simultaneously to obtain the value of junction temperature for given values of diode case temperature, DC power dissipation and RF power dissipation.
[5]
Agilent Application Note 1050, "Low Cost, Surface Mount Power Limiters."
10
Assembly Instructions
SOT-3x3 PCB Footprint Recommended PCB pad layouts for the miniature SOT-3x3 (SC-70) packages are shown in Figures 26 and 27 (dimensions are in inches). These layouts provide ample allowance for package placement by automated assembly equipment without adding parasitics that could impair the performance.
0.026
0.07 0.035
SMT Assembly Reliable assembly of surface mount components is a complex process that involves many material, process, and equipment factors, including: method of heating (e.g., IR or vapor phase reflow, wave soldering, etc.) circuit board material, conductor thickness and pattern, type of solder alloy, and the thermal conductivity and thermal mass of components. Components with a low mass, such as the SOT packages, will reach solder reflow temperatures faster than those with a greater mass. Agilent's diodes have been qualified to the time-temperature profile shown in Figure 28. This profile is representative of an IR reflow type of surface mount assembly process. After ramping up from room temperature, the circuit board with components attached to it (held in place with solder paste)
passes through one or more preheat zones. The preheat zones increase the temperature of the board and components to prevent thermal shock and begin evaporating solvents from the solder paste. The reflow zone briefly elevates the temperature sufficiently to produce a reflow of the solder. The rates of change of temperature for the ramp-up and cooldown zones are chosen to be low enough to not cause deformation of the board or damage to components due to thermal shock. The maximum temperature in the reflow zone (TMAX) should not exceed 235C. These parameters are typical for a surface mount assembly process for Agilent diodes. As a general guideline, the circuit board and components should be exposed only to the minimum temperatures and times necessary to achieve a uniform reflow of solder.
0.016
Figure 26. PCB Pad Layout, SOT-323 (dimensions in inches).
0.026
0.075
250 TMAX 200
TEMPERATURE (C)
0.035
0.016
150 Reflow Zone 100 Preheat Zone 50 0 0 60 120 180 240 300 TIME (seconds) Cool Down Zone
Figure 27. PCB Pad Layout, SOT-363 (dimensions in inches).
Figure 28. Surface Mount Assembly Profile.
11
Part Number Ordering Information
Part Number HSMS-282x-TR2* HSMS-282x-TR1* HSMS-282x-BLK * No. of Devices 10000 3000 100 Container 13" Reel 7" Reel antistatic bag
x = 0, 2, 3, 4, 5, 7, 8, 9, B, C, E, F, K, L, M, N, P or R For lead-free option, the part number will have the character "G" at the end, eg. HSMS-282x-TR2G for a 10,000 lead-free reel.
Package Dimensions
Outline 23 (SOT-23)
1.02 (0.040) 0.89 (0.035) 0.54 (0.021) 0.37 (0.015) 3 1.40 (0.055) 1.20 (0.047) 2
0.650 BSC (0.025)
Outline SOT-323 (SC-70 3 Lead)
DATE CODE (X)
PACKAGE MARKING CODE (XX) 1.30 (0.051) REF. DATE CODE (X)
PACKAGE MARKING CODE (XX)
XXX
2.65 (0.104) 2.10 (0.083)
2.20 (0.087) 2.00 (0.079)
XXX
1.35 (0.053) 1.15 (0.045)
1 0.60 (0.024) 0.45 (0.018)
2.04 (0.080) 1.78 (0.070) TOP VIEW 0.152 (0.006) 0.066 (0.003) 1.02 (0.041) 0.85 (0.033)
0.10 (0.004) 0.00 (0.00)
2.20 (0.087) 1.80 (0.071)
0.425 (0.017) TYP.
0.30 REF.
3.06 (0.120) 2.80 (0.110)
0.25 (0.010) 0.15 (0.006)
1.00 (0.039) 0.80 (0.031)
10
0.30 (0.012) 0.10 (0.004)
0.20 (0.008) 0.10 (0.004)
0.10 (0.004) 0.013 (0.0005) SIDE VIEW DIMENSIONS ARE IN MILLIMETERS (INCHES)
0.69 (0.027) 0.45 (0.018)
DIMENSIONS ARE IN MILLIMETERS (INCHES)
END VIEW
Outline 143 (SOT-143)
0.92 (0.036) 0.78 (0.031) DATE CODE (X) 2 PACKAGE MARKING CODE (XX) 1
Outline SOT-363 (SC-70 6 Lead)
PACKAGE MARKING CODE (XX) 1.30 (0.051) REF. DATE CODE (X)
XXX
1.40 (0.055) 1.20 (0.047) 3
2.65 (0.104) 2.10 (0.083)
2.20 (0.087) 2.00 (0.079)
XXX
1.35 (0.053) 1.15 (0.045)
4
0.60 (0.024) 0.45 (0.018) 2.04 (0.080) 1.78 (0.070) 3.06 (0.120) 2.80 (0.110)
0.54 (0.021) 0.37 (0.015)
0.650 BSC (0.025) 2.20 (0.087) 1.80 (0.071)
0.15 (0.006) 0.09 (0.003)
0.425 (0.017) TYP.
0.10 (0.004) 0.00 (0.00)
0.30 REF.
1.04 (0.041) 0.85 (0.033) 0.10 (0.004) 0.013 (0.0005) DIMENSIONS ARE IN MILLIMETERS (INCHES) 0.69 (0.027) 0.45 (0.018)
1.00 (0.039) 0.80 (0.031) 0.25 (0.010) 0.15 (0.006)
10
0.30 (0.012) 0.10 (0.004)
0.20 (0.008) 0.10 (0.004)
DIMENSIONS ARE IN MILLIMETERS (INCHES)
12
Device Orientation
REEL
For Outlines SOT-23, -323
TOP VIEW 4 mm END VIEW
CARRIER TAPE USER FEED DIRECTION COVER TAPE
8 mm
ABC
ABC
ABC
ABC
Note: "AB" represents package marking code. "C" represents date code.
For Outline SOT-143
TOP VIEW 4 mm END VIEW
For Outline SOT-363
TOP VIEW 4 mm END VIEW
8 mm
ABC
ABC
ABC
ABC
8 mm
ABC
ABC
ABC
ABC
Note: "AB" represents package marking code. "C" represents date code.
Note: "AB" represents package marking code. "C" represents date code.
13
Tape Dimensions and Product Orientation
For Outline SOT-23
P D
P2
E
P0
F W
t1
D1
9 MAX
Ko
8 MAX
13.5 MAX
A0
B0
DESCRIPTION CAVITY LENGTH WIDTH DEPTH PITCH BOTTOM HOLE DIAMETER DIAMETER PITCH POSITION WIDTH THICKNESS CAVITY TO PERFORATION (WIDTH DIRECTION) CAVITY TO PERFORATION (LENGTH DIRECTION)
SYMBOL A0 B0 K0 P D1 D P0 E W t1 F P2
SIZE (mm) 3.15 0.10 2.77 0.10 1.22 0.10 4.00 0.10 1.00 + 0.05 1.50 + 0.10 4.00 0.10 1.75 0.10 8.00 +0.30 -0.10 0.229 0.013 3.50 0.05 2.00 0.05
SIZE (INCHES) 0.124 0.004 0.109 0.004 0.048 0.004 0.157 0.004 0.039 0.002 0.059 + 0.004 0.157 0.004 0.069 0.004 0.315 +0.012 -0.004 0.009 0.0005 0.138 0.002 0.079 0.002
PERFORATION
CARRIER TAPE
DISTANCE BETWEEN CENTERLINE
For Outline SOT-143
P P0 D P2 E F W
D1 t1
9 MAX
K0
9 MAX
A0
DESCRIPTION CAVITY LENGTH WIDTH DEPTH PITCH BOTTOM HOLE DIAMETER DIAMETER PITCH POSITION WIDTH THICKNESS CAVITY TO PERFORATION (WIDTH DIRECTION) CAVITY TO PERFORATION (LENGTH DIRECTION) SYMBOL A0 B0 K0 P D1 D P0 E W t1 F P2 SIZE (mm) 3.19 0.10 2.80 0.10 1.31 0.10 4.00 0.10 1.00 + 0.25 1.50 + 0.10 4.00 0.10 1.75 0.10
B0
SIZE (INCHES) 0.126 0.004 0.110 0.004 0.052 0.004 0.157 0.004 0.039 + 0.010 0.059 + 0.004 0.157 0.004 0.069 0.004 0.315+0.012 -0.004 0.0100 0.0005 0.138 0.002 0.079 0.002
PERFORATION
CARRIER TAPE DISTANCE
8.00 +0.30 -0.10 0.254 0.013 3.50 0.05 2.00 0.05
Tape Dimensions and Product Orientation
For Outlines SOT-323, -363
P P0 D P2
E
F W C
D1 t1 (CARRIER TAPE THICKNESS) Tt (COVER TAPE THICKNESS)
An
K0
An
A0
B0
DESCRIPTION CAVITY LENGTH WIDTH DEPTH PITCH BOTTOM HOLE DIAMETER DIAMETER PITCH POSITION WIDTH THICKNESS WIDTH TAPE THICKNESS CAVITY TO PERFORATION (WIDTH DIRECTION) CAVITY TO PERFORATION (LENGTH DIRECTION) ANGLE FOR SOT-323 (SC70-3 LEAD) FOR SOT-363 (SC70-6 LEAD)
SYMBOL A0 B0 K0 P D1 D P0 E W t1 C Tt F P2 An
SIZE (mm) 2.40 0.10 2.40 0.10 1.20 0.10 4.00 0.10 1.00 + 0.25 1.55 0.05 4.00 0.10 1.75 0.10 8.00 0.30 0.254 0.02 5.4 0.10 0.062 0.001 3.50 0.05 2.00 0.05 8C MAX 10C MAX
SIZE (INCHES) 0.094 0.004 0.094 0.004 0.047 0.004 0.157 0.004 0.039 + 0.010 0.061 0.002 0.157 0.004 0.069 0.004 0.315 0.012 0.0100 0.0008 0.205 0.004 0.0025 0.00004 0.138 0.002 0.079 0.002
PERFORATION
CARRIER TAPE COVER TAPE DISTANCE
www.agilent.com/semiconductors
For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (916) 788-6763 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (65) 6756 2394 India, Australia, New Zealand: (65) 6755 1939 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (65) 6755 1989 Singapore, Malaysia, Vietnam, Thailand, Philippines, Indonesia: (65) 6755 2044 Taiwan: (65) 6755 1843 Data subject to change. Copyright (c) 2004 Agilent Technologies, Inc. Obsoletes 5968-8014E February 6, 2004 5989-0279EN

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