SM15T39AY ST Diode

The SM15T39AY from STMicroelectronics is an automotive-grade 1500 W unidirectional TVS diode that safeguards circuits against load‑dump surges and ESD. For selection, key parameters are a 33.3 V stand‑off voltage, a 37.1 V minimum breakdown, and a 69.7 V clamp that divert up to 143 A pulse current (8/20 µs). The leakage current stays below 0.2 µA at 25 °C, so standby losses are minimal. AEC‑Q101 qualification and –40 °C to +150 °C operation guarantee reliability in harsh under‑hood or industrial environments. The planar technology and SMC footprint simplify surface‑mount layout while satisfying ISO 7637‑2 and ISO 10605. In application it guards 24 V/28 V automotive ECUs, engine‑management modules, body‑control units, and infotainment buses; it also shields industrial PLC I/O ports, sensor supplies, telecom line cards, and any 24 V power rail requiring compact, high‑surge transient protection. In stock at HL Electronics – request a quote for fast delivery.