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PROTECTION PRODUCTS Description
RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The SRDA70-4 has been specifically designed to protect sensitive components which are connected to data and transmission lines from over-voltages caused by electrostatic discharge (ESD), electrical fast transients (EFT), and lightning. The unique design of the SRDA70-4 integrates eight surge rated, low capacitance steering diodes in a low profile SO-8 package. During transient conditions, the steering diodes direct the transient to either the positive side of the power supply line or to ground. The SRDA70-4 may be used as a stand alone device or in conjunction with TVS diodes for enhanced protection. The low capacitance array configuration allows the user to protect four high speed data or I/O lines. The low inductance construction minimizes voltage overshoot during high current surges.
RailClamp Low Capacitance TVS Diode Array
Features
Transient protection for high speed data lines to IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 1kV, 24A (8/20s) Array of surge rated diodes Protects four I/O lines Low capacitance for high-speed interfaces High surge capability Low forward voltage characteristics Solid-state silicon avalanche technology
SRDA70-4
Mechanical Characteristics
JEDEC SO-8 package UL 497B listed Molding compound flammability rating: UL 94V-0 Marking : Part number, date code, logo Packaging : Tube or Tape and Reel per EIA 481 RoHS/WEEE Compliant
Applications
Latch-Up Protection Microcontroller Input Protection Token Ring I2C Bus Protection Video Line Protection Set Top Box I/O LAN/WAN Equipment
Circuit Diagram
Schematic and PIN Configuration
REF 1
I/O 1
1
8
REF 2 I/O 4
I/O 1
I/O 2
I/O 3
I/O 4
REF 1
2
7
REF 1
3
6
I/O 3 REF 2
REF 2
I/O 2
4
5
SO-8 (Top View)
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SRDA70-4
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Current (tp = 8/20s) Rectifier Repetitive Peak Reverse Voltage Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Lead Soldering Temperature Operating Temperature Storage Temperature Symbol IP P V RRM J A J C TL TJ TSTG Value 24 70 163 38.8 260 (10 sec.) -55 to +125 -55 to +150 Units A V C /W C /W C C C
Electrical Characteristics
SR DA70-4 Parameter Rectifier Rep etitive Peak reverse Voltage Reverse Breakdown Voltage Reverse Leakage Current Forward Voltage Forward Voltage Junction Cap acitance Symbol V RRM V BR IR VF VF Cj It = 50A VRWM = 70V, T=25C IPP = 1A, tp = 8/20s IPP = 10A, tp = 8/20s Between I/O p ins and Ground VR = 0V, f = 1MHz Between I/O p ins VR = 0V, f = 1MHz 4 85 5 1.3 3.3 15 Conditions Minimum Typical Maximum 70 Units V V A V V pF
pF
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SRDA70-4
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10 Peak Pulse Power - Ppk (kW)
Power Derating Curve
110 100 % of Rated Power or PP I 90 80 70 60 50 40 30 20 10 0
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
0
25
50
75
100
125
150
Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 Percent of IPP 70 60 50 40 30 20 10 0 0 5 10 15 T im e (s) 20 25 30 td = I PP /2 e
-t
Variation of Capacitance vs. Reverse Voltage
W aveform Parameters: tr = 8s td = 20s
0 -2 % Change in Capacitance -4 -6 -8 -10 -12 -14 -16 0 1 2 3 4 5 6 Reverse Voltage - VR (V)
Foward Voltage vs. Forward Current
10 9 Forward Voltage - VF (V) 8 7 6 5 4 3 2 1 0 0 5 10 15 20 25 30 35 40 45 50 Forward Current - IF (A) Waveform Parameters: tr = 8s td = 20s
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SRDA70-4
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Four High-Speed Data Lines The SRDA70-4 TVS is designed to protect four data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode VF) the steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. Data lines are connected at pins 1, 4, 6 and 7. The negative reference (REF2) is connected at pins 5 and 8. These pins should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic inductance. The positive reference (REF1) is connected at pins 2 and 3. The options for connecting the positive reference are as follows: 1. To protect data lines and the power line, connect pins 2 and 3 directly to the positive supply rail (VCC). In this configuration the data lines are referenced to the supply voltage. An external TVS diode may be added between the supply rail and ground in order to prevent over-voltage on the supply rail. 2. The SRDA70-4 can be isolated from the power supply by adding a series resistor between pins 2 and 3 and VCC. A value of 10k is recommended. The internal steering diodes remain biased, providing the advantage of lower capacitance. 3. In applications where no positive supply reference is available, or complete supply isolation is desired, an external TVS diode may be used as the reference. The steering diodes will begin to conduct when the voltage on the protected line exceeds the working voltage of the TVS (plus one diode drop). I/O Protection
Microcontroller Protection
SRDA70-4
Matte Tin Lead Finish Matte tin has become the industry standard lead-free replacement for SnPb lead finishes. A matte tin finish is composed of 100% tin solder with large grains. Since the solder volume on the leads is small compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both lead-free and SnPb assembly techniques. In addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint.
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SRDA70-4
PROTECTION PRODUCTS Applications Information - Spice Model
Vcc
I/O
0.8 nH
SRDA70-4 Spice Model
SRDA70-4 Spice Parameters Parameter IS BV VJ RS IBV CJO TT M N EG Unit Amp Volt Volt O hm Amp Farad sec --eV D1 (LCRD) 3.54E-14 680 0.62 0.330 1 E -3 5.2E-12 2.56E-9 0.058 1.1 1.11 D2 (LCRD) 1.46E-14 240 0.64 0.124 1E-3 6.2E-12 2.56E-9 0.058 1.1 1.11
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SRDA70-4
PROTECTION PRODUCTS Outline Drawing - SO-8
A N 2X E/2 E1 E 1 ccc C 2X N/2 TIPS 2 e/2 B D aaa C SEATING PLANE A2 A C bxN bbb A1 C A-B D SIDE VIEW GAGE PLANE 0.25 e D
h h
H
DIM
c
A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.053 .069 .010 .004 .065 .049 .012 .020 .010 .007 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 8 0 .004 .010 .008 1.35 1.75 0.10 0.25 1.25 1.65 0.31 0.51 0.17 0.25 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 0 8 0.10 0.25 0.20
L (L1) DETAIL
01
A
SEE DETAIL
A
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION AA.
Land Pattern - SO-8
X
DIM
(C) G Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40
Y P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
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SRDA70-4
PROTECTION PRODUCTS Ordering Information
Part Number SRDA70-4.TB SRDA70-4.TBT SRDA70-4 SRDA70-4.T Lead Finish SnPb Pb Free SnPb Pb Free Qty per Reel 500 500 95/Tube 95/Tube Reel Size 7 Inch 7 Inch N/A N/A
Note: Lead-free devices are RoHS/WEEE Compliant
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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