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AN315 - ROBUST ELECTRICAL SURGE IMMUNITY

General Description

Si3400 and Si3401 protection consists of a stack of ten, high-current 6.2 V Zener diodes.

These lower-voltage Zener diodes have a lower temperature and process variation than a higher voltage Zener clamp, such as an SMAJ58A.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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AN315 ROBUST ELECTRICAL SURGE IMMUNITY F O R P O E PD S T H R O U G H I N T E G R A T E D P R O T E C T I O N 1. Introduction The Si3400 and Si3401 Power over Ethernet (PoE) powered device (PD) controllers are designed in an efficient Silicon on Insulator (SOI) process technology, which enables the integration of a robust surge protection function. Competitive PoE PD devices require external transient voltage suppressors (TVS), such as an SMAJ58A, to provide surge protection. However, due to their inherently wider range of clamping voltage specifications, external TVS-based protectors typically necessitate the use of 100 V processes for the PD controller device. This note discusses some of the detailed considerations regarding the Si3400's proprietary surge protection circuitry that www.