1500 W clamping in a DO-214AB footprint
The 1.5SMC180A-E3/57T: Its 154 V reverse standoff voltage (working voltage) means it stays transparent on a 150 V DC rail, only conducting when a surge pushes the line above 171 V (minimum breakdown). At the 6.1 A peak pulse current (10/1000 µs waveform), the clamping voltage is held to 246 V max — the voltage the protected circuitry sees during the event. The 1500 W rating is the product of clamp voltage and peak current; a lower-standoff part in the same package delivers less energy handling at a given voltage.
Package and temperature envelope
Housed in the DO-214AB (SMC) package, the same footprint as the SMCJ series. The junction temperature range spans -65°C to 150°C, covering automotive under-hood and industrial outdoor use without derating at the high end. The unidirectional Zener structure provides a single-channel clamp — suitable for DC rails where polarity is fixed. No power line protection feature (no bidirectional clamping), so reverse-polarity events require a separate diode or a bidirectional TVS.
Sourcing and compliance
The base product number is 1.5SMC180, and the -/57T suffix denotes the tape-and-reel packaging (7-inch reel, 500-piece quantity).