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Objective data sheet

Rev. 01 — 25 January 2005

7 of 12

Philips Semiconductors

PESD1CAN

CAN bus ESD protection diode in SOT23

7.

Application information

The PESD1CAN is designed for the protection of two automotive CAN bus lines from the

damage caused by ElectroStatic Discharge (ESD) and surge pulses. The PESD1CAN

provides a surge capability of up to 200 W per line for a 8/20

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 protection device as close to the input terminal or connector as possible.

2. The path length between the protection device and the protected line should be

minimized.

3. Keep parallel signal paths to a minimum.

4. Avoid running protection conductors in parallel with unprotected conductor.

5. Minimize all printed-circuit board 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 printed-circuit

boards, use ground vias.

Fig 7.

Typical application: ESD protection of two automotive CAN bus lines

006aaa260

GND

PESD1CAN

line 2 to be protected

line 1 to be protected