That night, her test board sat on the bench. ECHO pin dark.

Used in devices requiring compact, efficient voltage regulation. Industrial/Telecom:

The VPM2SM is a high-performance, surface-mount transient voltage suppressor (TVS) diode, designed to protect sensitive electronics from voltage spikes and electrostatic discharge (ESD). This article serves as a comprehensive resource, consolidating everything you need to know: from absolute maximum ratings and electrical characteristics to PCB layout tips and cross-reference alternatives.

That night, Elara soldered a VPM2SM onto a test board. No load. Just a 3V coin cell, a scope probe on ECHO, and a switch on SENSE.

The VPM2SM datasheet provides two main application topologies: