5 Layout considerations for TVS diodes (ESD protection diodes)

Note that the placement of ESD protection diodes affects their ESD protection performance.
1. Place ESD protection diodes close to the ESD entry point.
2. Minimize trace inductance in series with ESD protection diodes including GND after the board traces originating from the connector diverge into two paths leading to ESD protection diodes and the DUP.

When an ESD protection diode is placed near the DUP/When an ESD protection diode is placed near the connector
Figure 5.1 Difference in clamp voltage depending on the placement of ESD protection diodes
Figure 5.1 Difference in clamp voltage depending on the placement of ESD protection diodes
Figure 5.2 Board traces for ESD protection diodes
Figure 5.2 Board traces for ESD protection diodes

3. Do not run any board trace in parallel with a signal trace to which an ESD pulse might be introduced. In particular, avoid running board traces leading to a device with low ESD immunity in parallel with a board trace that could be exposed to an ESD event.

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