A 600 W bidirectional transient suppressor for 24 V rails
It offers a peak pulse power rating of 600 W (10/1000 µs waveform) and a reverse standoff voltage of 23.1 V, meaning it sits across the line and does not conduct until the transient exceeds that threshold. The clamping voltage is held to 48.3 V at the peak pulse current of 83 A (8/20 µs waveform), which keeps downstream silicon within its safe operating area during surge events like inductive load dump or lightning-coupled spikes. This part is a general-purpose protector for industrial control, telecom, and automotive auxiliary circuits where the board sees a 24 V bus and needs a single bidirectional device to handle both positive and negative transients without polarity concerns.
Bidirectional channel — one part covers both polarities
The SM6T27CA is a single-channel bidirectional device, which means it protects against overvoltage events of either polarity on the same line. This simplifies the BOM compared to using two unidirectional TVS diodes back-to-back, saving board area and reducing component count. The breakdown voltage range starts at a minimum of 25.7 V, so on a 24 V rail it stays transparent during normal operation and only activates when the transient pushes above that knee.
Package and mounting — DO-214AA SMB for standard reflow
The SMB body is large enough to handle the 600 W pulse without excessive junction temperature rise, and the gull-wing leads provide a visual solder-joint inspection point.