Transient suppression for 30.8 V automotive rails
The 1.5SMC36AHE3/9AT is a 1500 W peak-pulse Zener TVS from Vishay's TransZorb series, qualified to AEC-Q101 for automotive applications. Its 30.8 V reverse standoff voltage protects 28 V or 30 V nominal rails — typical in 24 V truck or heavy-equipment electrical systems — while the 34.2 V minimum breakdown ensures the device stays off the line during normal operation. Clamping at 49.9 V with a 30.1 A peak-pulse current (10/1000 µs waveform), this part handles load-dump and inductive-kick transients that exceed the battery voltage. The single unidirectional channel biases the cathode toward the protected rail, shunting positive overvoltage to ground.
AEC-Q101 and package traceability
The supplier device package is listed as DO-214AB (SMCJ) — same JEDEC outline, same pad layout. Tape-and-reel packaging suits high-volume pick-and-place assembly.
The laser-etch marking on the DO-214AB body should read the Vishay date-code format consistent with the TransZorb series — a mismatch in font or pad oxidation pattern flags potential re-marked stock. Lot traceability is confirmed at RFQ.