Datasheet BZA456A Datasheet (Philips)

DISCRETE SEMICONDUCTORS

DATA SH EET

ook, halfpage

M3D302

BZA456A

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 BZA456A

FEATURES

• ESD rating >8 kV, according to IEC1000-4-2

• SOT457 surface mount package

• Common anode configuration

• Non-clamping range −0.5 to 5.6 V

• Maximum reverse peak power dissipation:

24 W at tp=1ms

• Maximum clamping voltage at peak pulse current:
8 V at I

ZSM

=3A.

APPLICATIONS

• Computers and peripherals

• Audio and video equipment

• Communication systems

• Medical equipment.

DESCRIPTION

Monolithic transient voltage suppressor diode in a six lead
SOT457 (SC-74) package for 4-bit wide ESD transient
suppression at 5.6 V level.

PINNING

PIN DESCRIPTION

1 cathode 1
2 common
3 cathode 2
4 cathode 3
5 common
6 cathode 4

handbook, halfpage

132

Top view

Marking code: Z6.

56

4

1
3
4
6

MAM357

Fig.1 Simplified outline (SOT457) and symbol.

2
5

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

Per diode

I

Z

I

F

I

FSM

I

ZSM

P

tot

P

ZSM

working current Ts=60°C; note 1 − note 2 mA
continuous forward current Ts=60°C − 100 mA
non-repetitive peak forward current tp= 1 ms; square pulse − 3.75 A
non-repetitive peak reverse current tp= 1 ms; square pulse; see Fig.2 − 3A
total power dissipation Ts=60°C; see Fig.3 − 720 mW
non repetitive peak reverse power

square pulse; tp= 1 ms; see Fig.4 − 24 W

dissipation

T

stg

T

j

storage temperature −65 +150 °C
junction temperature −65 +150 °C

Notes

1. T

is the temperature at the soldering point of the anode pin.

s

2. DC working current limited by P

tot max

.

1999 May 25 2

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th j-s

ELECTRICAL CHARACTERISTICS

=25°C unless otherwise specified.

T

j

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Per diode

V

Z

V

F

V

ZSM

I

R

r

dif

S

Z

C

d

thermal resistance from junction to soldering point one or more diodes loaded 125 K/W

working voltage IZ= 1 mA 5.32 5.6 5.88 V
forward voltage IF= 200 mA −−1.3 V
non-repetitive peak reverse voltage I

= 3 A; tp=1ms −−8V

ZSM

reverse current VR=3V −−2µA
differential resistance IZ= 250 µA −−1600 Ω

I

=1mA −−400 Ω

Z

temperature coefficient of working

IZ=5mA − 1.2 − mV/K

voltage
diode capacitance see Fig.5

V

= 0; f = 1 MHz −−240 pF

R

V

= 3 V; f = 1 MHz −−140 pF

R

1999 May 25 3

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

10

handbook, halfpage

I

ZSM

(A)

1

−1

10

1

tp (ms)

Fig.2 Maximum non-repetitive peak reverse

current as a function of pulse time.

MDA190

150

Ts (

MDA198

o

C)

1000

handbook, halfpage

P

tot

(mW)

800

600

400

200

10

0

0 50 100 200

All diodes loaded.

Fig.3 Power derating curve.

2

10

handbook, halfpage

P

ZSM

(W)

10

1

−1

10

P

ZSM=VZSM

V

ZSM

× I

.

is the non-repetitive peak reverse voltage at I

ZSM

110

tp (ms)

Fig.4 Maximum non-repetitive peak reverse

power dissipation as a function of pulse
duration (square pulse).

MDA199

ZSM

250

handbook, halfpage

C

d

(pF)

200

150

100

50

0

05

.

Tj=25°C; f = 1 MHz.

1234

MDA192

VR (V)

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 BZA456A

handbook, full pagewidth

IEC 1000-4-2 network
CZ = 150 pF; RZ = 330 Ω

ESD TESTER DIGITIZING

R

Z

C

Z

1/4 BZA456A

vertical scale = 100 V/Div
horizontal scale = 50 ns/Div

450 Ω

RG 223/U

50 Ω coax

10×

ATTENUATOR

note 1

Note 1: attenuator is only used for open
socket high voltage measurements

vertical scale = 10 V/Div
horizontal scale = 50 ns/Div

OSCILLOSCOPE

50 Ω

GND

unclamped +1 kV ESD voltage waveform
(IEC 1000−4−2 network)

GND

vertical scale = 100 V/Div
horizontal scale = 50 ns/Div

unclamped −1 kV ESD voltage waveform
(IEC 1000−4−2 network)

Fig.6 ESD clamping test set-up and waveforms.

GND

clamped +1 kV ESD voltage waveform
(IEC 1000−4−2 network)

GND

vertical scale = 10 V/Div
horizontal scale = 50 ns/Div

clamped −1 kV ESD voltage waveform
(IEC 1000−4−2 network)

MGL247

1999 May 25 5

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

APPLICATION INFORMATION
Typical common anode application

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

handbook, full pagewidth

keyboard,

terminal,

printer,

etc.

I/O

BZA456A

Fig.7 Computer interface protection.

address bus

RAM

ROM

A
B
C
D

FUNCTIONAL

DECODER

MGK458

GND

V

DD

V

GG

I/O

BZA456A

Fig.8 Microprocessor protection.

1999 May 25 6

data bus

control bus

CPU

CLOCK

MGK459

GND

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

Device placement and printed-circuit board layout

Circuit board layout is of extreme importance in the
suppression of transients. The clamping voltage of the
BZA456A 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.

1999 May 25 7

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

PACKAGE OUTLINE

Plastic surface mounted package; 6 leads SOT457

D

y

56

pin 1
index

4

132

e

b

p

wBM

E

H

E

A

A

1

detail X

AB

Q

c

L

p

X

v M

A

0 1 2 mm

scale

DIMENSIONS (mm are the original dimensions)

A

UNIT

A

1.1

mm

OUTLINE
VERSION

SOT457 SC-74

0.9

0.013

0.1

b

cD

p

1

0.40

0.26

0.25

0.10

IEC JEDEC EIAJ

3.1

2.7

E

1.7

1.3

REFERENCES

e

0.95

H

E

3.0

2.5

1999 May 25 8

L

Qywv

p

0.6

0.33

0.2

0.23

0.2 0.10.2

EUROPEAN

PROJECTION

ISSUE DATE

97-02-28

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

DEFINITIONS

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.

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 BZA456A

NOTES

1999 May 25 10

Philips Semiconductors Product specification

Quadruple ESD transient voltage suppressor BZA456A

NOTES

1999 May 25 11

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1999 65

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Printed in The Netherlands 115002/00/03/pp12 Date of release: 1999May 25 Document order number: 9397 750 05953