MMBZXAL_SER_2

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 02 — 10 December 2009

12 of 17

NXP Semiconductors

MMBZxAL series

Low capacitance unidirectional double ESD protection diodes

8.

Application information

The MMBZxAL series is designed for the protection of up to two unidirectional data or

signal lines from the damage caused by ESD and surge pulses. The devices may be used

on lines where the signal polarities are either positive or negative with respect to ground.

The MMBZ5V6AL, MMBZ6V2AL, MMBZ6V8AL, MMBZ9V1AL and MMBZ10VAL provide

a surge capability of 24 W per line, the MMBZ12VAL, MMBZ15VAL, MMBZ18VAL,

MMBZ20VAL, MMBZ27VAL and MMBZ33VAL provide a surge capability of 40 W per line,

for a 10/1000

μs waveform.

Circuit board layout and protection device placement

Circuit board layout is critical for the suppression of ESD, Electrical Fast Transient (EFT)

and surge transients. The following guidelines are recommended:

1. Place the MMBZxAL series as close to the input terminal or connector as possible.

2. The path length between the MMBZxAL series and the protected line should be

minimized.

3. Keep parallel signal paths to a minimum.

4. Avoid running protected conductors in parallel with unprotected conductors.

5. Minimize all PCB conductive loops including power and ground loops.

6. Minimize the length of the transient return path to ground.

7. Avoid using shared transient return paths to a common ground point.

8. Ground planes should be used whenever possible. For multilayer PCBs, use ground

vias.

9.

Test information

9.1 Quality information

This product has been qualified in accordance with the Automotive Electronics Council

(AEC) standard Q101 - Stress test qualification for discrete semiconductors, and is

suitable for use in automotive applications.

Fig 10. Typical application: ESD and transient voltage protection of data lines

006aab842

MMBZxAL

line 1 to be protected

unidirectional protection

of two lines

bidirectional protection

of one line

line 2 to be protected

GND

MMBZxAL

line 1 to be protected

GND