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DISCRETE SEMICONDUCTORS
DATA SHEET
book, halfpage
M3D302
BZA462A Quadruple ESD transient voltage suppressor
Product specification Supersedes data of 1998 Oct 30 1999 May 25
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
FEATURES * ESD rating >15 kV, according to IEC1000-4-2 * SOT457 surface mount package * Common anode configuration * Non-clamping range -0.5 to 6.2 V * Maximum reverse peak power dissipation: 24 W at tp = 1 ms * Maximum clamping voltage at peak pulse current: 9 V at IZSM = 2.66 A. APPLICATIONS * Computers and peripherals * Audio and video equipment * Communication systems * Medical equipment.
1 2 3
MAM357
BZA462A
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 6.2 V level.
Top view
Marking code: Z2t.
Fig.1 Simplified outline (SOT457) and symbol.
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). 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 2.66 720 24 +150 +150 mA mA A A mW W C C PARAMETER CONDITIONS MIN. MAX. UNIT
1999 May 25
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
BZA462A
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 non-repetitive peak reverse voltage reverse current differential resistance temperature coefficient of working voltage diode capacitance IZ = 1 mA IF = 200 mA IZSM = 3.5 A; tp = 1 ms VR = 4 V IZ = 1 mA IZ = 5 mA see Fig.5 VR = 0; f = 1 MHz VR = 4 V; f = 1 MHz - - - - 200 110 pF pF 5.89 - - - - - 6.2 - - - - 1.2 6.51 1.3 9 700 300 - V V V nA mV/K PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
1999 May 25
3
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
BZA462A
handbook, halfpage
10
MBK479
handbook, halfpage
1000 Ptot
MDA198
(mW) 800
600 IZSM (A) 400
200
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
MBK481
handbook, halfpage
200 Cd
MBK480
(pF)
PZSM (W)
160
120
10
80
40
1 10-1
0
1
tp (ms)
10
0
1
2
3
4
5 VR (V)
6
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.
1999 May 25
4
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
BZA462A
ESD TESTER RZ CZ
450
RG 223/U 50 coax
10x ATTENUATOR note 1
DIGITIZING OSCILLOSCOPE
50
Note 1: attenuator is only used for open socket high voltage measurements IEC 1000-4-2 network CZ = 150 pF; RZ = 330 1/4 BZA462A
vertical scale = 100 V/Div horizontal scale = 50 ns/Div
vertical scale = 10 V/Div horizontal scale = 50 ns/Div
GND
GND
unclamped +1 kV ESD voltage waveform (IEC 1000-4-2 network)
clamped +1 kV ESD voltage waveform (IEC 1000-4-2 network)
GND
GND
vertical scale = 100 V/Div horizontal scale = 50 ns/Div unclamped -1 kV ESD voltage waveform (IEC 1000-4-2 network)
vertical scale = 10 V/Div horizontal scale = 50 ns/Div clamped -1 kV ESD voltage waveform (IEC 1000-4-2 network)
MBK478
Fig.6 ESD clamping test set-up and waveforms.
1999 May 25
5
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
APPLICATION INFORMATION Typical common anode application
BZA462A
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 7 and 8.
handbook, full pagewidth
keyboard, terminal, printer, etc.
I/O
A B C D FUNCTIONAL DECODER
BZA462A GND
MBK476
Fig.7 Computer interface protection.
handbook, full pagewidth
VDD address bus VGG
RAM
ROM
I/O
data bus
CPU CLOCK
control bus
BZA462A GND
MBK477
Fig.8 Microprocessor protection.
1999 May 25
6
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 BZA462A 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.
BZA462A
1999 May 25
7
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
PACKAGE OUTLINE Plastic surface mounted package; 6 leads
BZA462A
SOT457
D
B
E
A
X
y
HE
vMA
6
5
4
Q
pin 1 index
A
A1
1
e
2
bp
3
wM B detail X Lp
c
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
1999 May 25
8
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
DEFINITIONS Data Sheet Status Objective specification Preliminary specification Product specification Limiting values
BZA462A
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). 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 Where application information is given, it is advisory and does not form part of the specification. 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 customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.
1999 May 25
9
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
NOTES
BZA462A
1999 May 25
10
Philips Semiconductors
Product specification
Quadruple ESD transient voltage suppressor
NOTES
BZA462A
1999 May 25
11
Philips Semiconductors - a worldwide company
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For all other countries apply to: Philips Semiconductors, International Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 (c) Philips Electronics N.V. 1999
Internet: http://www.semiconductors.philips.com
SCA 65
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
115002/00/03/pp12
Date of release: 1999 May 25
Document order number:
9397 750 05926

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