Automotive-grade transient clamp for 300 V rails
The 1.5KE350CAHB0G: Its 300 V reverse standoff voltage and 482 V clamping level protect a nominal 300 V DC bus or 240 VAC line against inductive-load dump and lightning-induced transients.
Clamping voltage and pulse current — the fit decision
The minimum breakdown voltage is 333 V, so the diode starts conducting at that threshold and clamps the transient to 482 V maximum at the rated 3.2 A peak pulse current. For a protected rail rated at 300 V nominal, this clamping margin keeps the downstream semiconductor stress below typical 500 V abs-max ratings. The 1500 W peak pulse rating uses the standard 10/1000 µs double-exponential waveform — a shorter transient (e.g. 8/20 µs) allows higher peak current; a longer surge requires derating. The 3.2 A Ipp at the clamp voltage confirms the diode can absorb the energy of a typical 300 V rail surge without exceeding the junction temperature limit of 175 °C.
Through-hole package and board integration
The DO-201AA (DO-27) axial leaded package requires a 1.0 mm diameter hole on a 0.100-inch pitch and is typically wave-soldered. The bulk packaging and through-hole format suit high-reliability power supplies, motor drives, and battery-management boards where the TVS is hand-inserted or auto-inserted on a leaded line. No power line protection feature is built in — this is a pure transient suppressor, not a reverse-polarity or overcurrent device.