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DISCRETE SEMICONDUCTORS
DATA SHEET
book, halfpage
M3D302
BZA418A Quadruple ESD transient voltage suppressor
Product specification 2002 Sep 02
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
FEATURES * ESD rating >8 kV, according to IEC1000-4-2 * SOT457 surface mount package * Common anode configuration * Non-clamping range -0.5 to 18 V * Maximum reverse peak power dissipation: 19.6 W at tp = 1 ms * Maximum clamping voltage at peak pulse current: 27 V at IZSM = 0.7 A. APPLICATIONS * Computers and peripherals * Audio and video equipment * Communication systems * Medical equipment.
1 2 3
MAM357
BZA418A
PINNING PIN 1 2 3 4 5 6 cathode 1 common cathode 2 cathode 3 common cathode 4 DESCRIPTION
handbook, halfpage 6
5
4 1 3 4 6 2 5
DESCRIPTION Monolithic transient voltage suppressor diode in a six lead SOT457 (SC-74) package for 4-bit wide ESD transient suppression at 18 V level.
Top view
Marking code: L1.
Fig.1 Simplified outline (SOT457) and symbol.
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 60134). SYMBOL Per diode IZ IF IFSM IZSM Ptot PZSM Tstg Tj Notes 1. Ts is the temperature at the soldering point of the anode pin. 2. DC working current limited by Ptot max. working current continuous forward current non-repetitive peak forward current non-repetitive peak reverse current total power dissipation non repetitive peak reverse power dissipation storage temperature junction temperature Ts = 60 C; note 1 Ts = 60 C tp = 1 ms; square pulse tp = 1 ms; square pulse; see Fig.2 Ts = 60 C; see Fig.3 square pulse; tp = 1 ms; see Fig.4 - - - - - - -65 -65 note 2 100 3.75 0.7 720 19.6 +150 +150 mA mA A A mW W C C PARAMETER CONDITIONS MIN. MAX. UNIT
2002 Sep 02
2
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
THERMAL CHARACTERISTICS SYMBOL Rth j-s PARAMETER thermal resistance from junction to soldering point CONDITIONS one or more diodes loaded
BZA418A
VALUE 125
UNIT K/W
ELECTRICAL CHARACTERISTICS Tj = 25 C unless otherwise specified. SYMBOL Per diode VZ VF VZSM IR rdif SZ Cd working voltage forward voltage reverse current differential resistance temperature coefficient of working voltage diode capacitance IZ = 1 mA IF = 200 mA VR = 14 V IZ = 1 mA IZ = 5 mA see Fig.5 VR = 0; f = 1 MHz - - - 48 14 pF pF VR = 13 V; f = 1 MHz - 17.1 - - - - - 18 - - - - 14.4 18.9 1.3 27 75 125 - V V V nA mV/K PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
non-repetitive peak reverse voltage IZSM = 0.7 A; tp = 1 ms
2002 Sep 02
3
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
BZA418A
handbook, halfpage
10
MDA197
handbook, halfpage
1000 Ptot
MDA198
IZSM (A)
(mW) 800
600 1 400
200
10-1 10-1
1
tp (ms)
10
0 0 50 100 150 Ts (oC) 200
All diodes loaded.
Fig.2
Maximum non-repetitive peak reverse current as a function of pulse time.
Fig.3 Power derating curve.
102 handbook, halfpage
MDA199
handbook, halfpage
50 Cd
MDA200
PZSM (W)
(pF) 40
30 10 20
10
1 10-1
1
tp (ms)
10
0 0 5 10 VR (V) 15
PZSM = VZSM x IZSM. VZSM is the non-repetitive peak reverse voltage at IZSM.
Tj = 25 C; f = 1 MHz.
Fig.4
Maximum non-repetitive peak reverse power dissipation as a function of pulse duration (square pulse).
Fig.5
Diode capacitance as a function of reverse voltage; typical values.
2002 Sep 02
4
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
APPLICATION INFORMATION Typical common anode application
BZA418A
A quadruple transient suppressor in a SOT457 package makes it possible to protect four separate lines using only one package. Two simplified examples are shown in Figs 6 and 7.
handbook, full pagewidth
keyboard, terminal, printer, etc.
I/O
A B C D FUNCTIONAL DECODER
BZA418A GND
MGU788
Fig.6 Computer interface protection.
handbook, full pagewidth
VDD address bus VGG
RAM
ROM
data bus I/O
CPU CLOCK
control bus
BZA418A GND
MGU789
Fig.7 Microprocessor protection.
2002 Sep 02
5
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
Device placement and printed-circuit board layout Circuit board layout is of extreme importance in the suppression of transients. The clamping voltage of the BZA418A is determined by the peak transient current and the rate of rise of that current (di/dt). Since parasitic inductances can further add to the clamping voltage (V = L di/dt) the series conductor lengths on the printed-circuit board should be kept to a minimum. This includes the lead length of the suppression element. In addition to minimizing conductor length the following printed-circuit board layout guidelines are recommended: 1. Place the suppression element close to the input terminals or connectors 2. Keep parallel signal paths to a minimum 3. Avoid running protection conductors in parallel with unprotected conductors 4. Minimize all printed-circuit board loop areas including power and ground loops 5. Minimize the length of the transient return path to ground 6. Avoid using shared transient return paths to a common ground point.
BZA418A
2002 Sep 02
6
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
PACKAGE OUTLINE Plastic surface mounted package; 6 leads
BZA418A
SOT457
D
B
E
A
X
y
HE
vMA
6
5
4
Q
pin 1 index
A A1 c
1
2
3
Lp
e
bp
wM B detail X
0
1 scale
2 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A 1.1 0.9 A1 0.1 0.013 bp 0.40 0.25 c 0.26 0.10 D 3.1 2.7 E 1.7 1.3 e 0.95 HE 3.0 2.5 Lp 0.6 0.2 Q 0.33 0.23 v 0.2 w 0.2 y 0.1
OUTLINE VERSION SOT457
REFERENCES IEC JEDEC EIAJ SC-74
EUROPEAN PROJECTION
ISSUE DATE 97-02-28 01-05-04
2002 Sep 02
7
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
DATA SHEET STATUS DATA SHEET STATUS(1) Objective data PRODUCT STATUS(2) Development DEFINITIONS
BZA418A
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
Preliminary data
Qualification
Product data
Production
Notes 1. Please consult the most recently issued data sheet before initiating or completing a design. 2. The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. DEFINITIONS Short-form specification The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. DISCLAIMERS Life support applications These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
2002 Sep 02
8
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
NOTES
BZA418A
2002 Sep 02
9
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
NOTES
BZA418A
2002 Sep 02
10
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
NOTES
BZA418A
2002 Sep 02
11
Philips Semiconductors - a worldwide company
Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
(c) Koninklijke Philips Electronics N.V. 2002
SCA74
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
613514/01/pp12
Date of release: 2002
Sep 02
Document order number:
9397 750 10098

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