Transient protection for 17.1 V rails
The 1.5SMC20A-E3/9AT: With a peak pulse power rating of 1500 W (10/1000 µs waveform), it absorbs surge energy that would otherwise damage downstream silicon — a common fit for general-purpose DC bus protection in industrial control and power supply outputs.
Clamping voltage and current handling
The reverse standoff voltage is 17.1 V, meaning the diode stays effectively open until the line exceeds that level. The device handles a peak pulse current of 54.2 A under the 10/1000 µs test condition, which defines the energy it can absorb without failing. Operating temperature spans -65 °C to 150 °C (junction), covering the full industrial range and beyond — no derating concern for most ambient environments.
Supplied in a DO-214AB (SMC) surface-mount package, the same footprint as the SMCJ suffix. The single unidirectional channel occupies minimal board area, and the Tape & Reel packaging suits automated assembly. No power line protection feature — this is a signal- or low-voltage DC rail clamp, not a mains-side device.