DATA SH EET
Product specification
Supersedes data of 1998 Jun 05 1998 Oct 15
BZA408B
Quadruple bidirectional ESD
transient voltage suppressor
b
ook, halfpage
M3D302
1998 Oct 15 2
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
FEATURES
•ESD rating >15 kV, according to IEC1000-4-2
•SOT457 surface mount package
•Non-clamping range: −5Vto+5V
•Channel separation: >70 dB
•Low reverse current: <100 nA
•Low diode capacitance: <75 pF.
APPLICATIONS
•Protection of equipment, connected to data and
transmission lines, against voltage surges caused by
electrostatic discharge e.g:
– Computers and peripherals
– Audio and video equipment
– Communication systems
– Medical equipment
– Portable electronics.
DESCRIPTION
4-bit wide monolithic bidirectional ESD transient voltage
suppressor in a six lead SOT457 (SC-74) package.
PINNING
PIN DESCRIPTION
1 cathode 1
2, 5 ground
3 cathode 2
4 cathode 3
6 cathode 4
Fig.1 Simplified outline (SOT457) and symbol.
Marking code: Z8.
handbook, halfpage
132
4
56
Top view
MAM409
132
456
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
Per diode (pin 2 and / or 5 connected to ground)
IZSM non-repetitive peak reverse current tp= 1 ms; square pulse; see Fig.2 −2A
P
ZSM non-repetitive peak power tp= 1 ms; square pulse −20 W
Tstg storage temperature −65 +150 °C
Tjjunction temperature −65 +150 °C
1998 Oct 15 3
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
THERMAL CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
Tj=25°C unless otherwise specified.
Note
1. αch (p to p) is measured as follows: a −7 dBs sinewave of 400 Hz is connected to e.g. pin 6 and a −7 dBs sinewave of
1 kHz to pin 1. The 1 kHz signal of pin 1 is measured on pin 6 by means of a spectrum analyser with an input
impedance of 1 MΩ. So αch (p to p) equals the 1 kHz level on pin 1 minus the 1 kHz level on pin 6. For the 400 Hz
signal the same measurement is done in the opposite way.
SYMBOL PARAMETER CONDITIONS VALUE UNIT
Rth j-s thermal resistance from junction to soldering point one or more diodes loaded 340 K/W
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
Per diode (pin 2 and / or 5 connected to ground)
VRWM working reverse voltage −5V
V
Rreverse voltage Itest = 5 mA 5.5 −V
VZSM non-repetitive peak reverse voltage tp= 1 ms; IZSM =2A −10 V
IRreverse current VR=V
RWM −100 nA
Cddiode capacitance see Fig.3
VR= 0; f = 1 MHz −75 pF
VR= 5 V; f = 1 MHz −55 pF
αch (p to p) pin to pin channel separation note 1; see Fig.4 70 −dB
1998 Oct 15 4
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
GRAPHICAL DATA
Fig.2 Maximum non-repetitive peak reverse
current as a function of pulse time.
handbook, halfpage
10
1
10−1
MGR557
10−210−1110
t
p
(ms)
IZSM
(A)
Fig.3 Diode capacitance as a function of reverse
voltage; typical values.
Tj=25°C; f = 1 MHz.
handbook, halfpage
0
80
60
40
20 15
MGR558
234
C
d
(pF)
VR (V)
Fig.4 Channel separation measurement setup.
handbook, full pagewidth
MGR556
600 Ω1
3
2
4
5
6
f = 1 kHz
−7 dBs
600 Ω
f = 400 Hz
−7 dBs
1 MΩ
SIGNAL
GENERATOR
SIGNAL
GENERATOR
SPECTRUM
ANALYZER
coaxial cable with
SMB connector
DUT
1998 Oct 15 5
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
Fig.5 ESD clamping test set-up and waveforms.
handbook, full pagewidth
MGR560
450 Ω
50 Ω
Note 1: attenuator is only used for open
socket high voltage measurements
IEC1000-4-2 network
CZ = 150 pF; RZ = 330 Ω
1/4 BZA408B
RG 223/U
50 Ω coax
RZ
CZ
ESD TESTER DIGITIZING
OSCILLOSCOPE
10×
ATTENUATOR
note 1
vertical scale = 100 V/Div
horizontal scale = 50 ns/Div vertical scale = 10 V/Div
horizontal scale = 50 ns/Div
vertical scale = 100 V/Div
horizontal scale = 50 ns/Div vertical scale = 10 V/Div
horizontal scale = 50 ns/Div
GND
GND
GND
unclamped +1 kV ESD voltage waveform
(IEC1000-4-2 network) clamped +1 kV ESD voltage waveform
(IEC1000-4-2 network)
GND
unclamped −1 kV ESD voltage waveform
(IEC1000-4-2 network) clamped −1 kV ESD voltage waveform
(IEC1000-4-2 network)
1998 Oct 15 6
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
APPLICATION INFORMATION
Typical bidirectional application
A quadruple bidirectional transient suppressor in a SOT457 package makes it possible to protect four separate lines
using only one package. One simplified example is shown in Fig.6.
Fig.6 Scart connector protection.
handbook, full pagewidth
MGR559
BZA408B
GND
SCART
CONNECTOR
TVSET/VCR
audio in L
audio in R
audio out L
audio out R
Device placement and printed-circuit board layout
Circuit board layout is of extreme importance in the suppression of transients. The clamping voltage of the BZA408B 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.
1998 Oct 15 7
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
PACKAGE OUTLINE
REFERENCES
OUTLINE
VERSION EUROPEAN
PROJECTION ISSUE DATE
IEC JEDEC EIAJ
SOT457 SC-74
wBM
b
p
D
e
pin 1
index A
A1
Lp
Q
detail X
HE
E
vMA
AB
y
0 1 2 mm
scale
c
X
132
4
56
Plastic surface mounted package; 6 leads SOT457
UNIT A1bpcDEH
E
L
p
Qywv
mm 0.1
0.013 0.40
0.25 3.1
2.7
0.26
0.10 1.7
1.3
e
0.95 3.0
2.5 0.2 0.10.2
DIMENSIONS (mm are the original dimensions)
0.6
0.2 0.33
0.23
A
1.1
0.9
97-02-28
1998 Oct 15 8
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
DEFINITIONS
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.
Data Sheet Status
Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.
Limiting values
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.
1998 Oct 15 9
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
NOTES
1998 Oct 15 10
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
NOTES
1998 Oct 15 11
Philips Semiconductors Product specification
Quadruple bidirectional ESD transient
voltage suppressor BZA408B
NOTES
Internet: http://www.semiconductors.philips.com
Philips Semiconductors – a worldwide company
© Philips Electronics N.V. 1998 SCA60
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
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Printed in The Netherlands 115104/00/02/pp12 Date of release: 1998 Oct 15 Document order number: 9397 750 04313
