1500 W peak pulse in a DO-214AB footprint
The 1.5SMC170: With a peak pulse power rating of 1500 W (10/1000 µs waveform) and a clamping voltage of 245.7 V at 6.5 A peak pulse current, it protects downstream silicon from surges like inductive load dumps or lightning-induced spikes on a DC bus.
What the ratings mean for the board
The 145 V reverse standoff voltage (V_RWM) is the maximum DC or AC peak voltage the diode can withstand without conducting — it sits across the rail in standby, drawing negligible leakage. The breakdown voltage range starts at 153.45 V minimum, meaning the diode begins to avalanche just above the normal operating voltage, leaving a guard band for rail tolerance. For a 1500 W pulse, the clamping voltage is the product of the peak current and the dynamic resistance; a lower clamp voltage means tighter protection for the downstream MOSFET or IC, but the trade-off is a higher standby current at the breakdown knee. The DO-214AB (SMC) package is a standard surface-mount footprint for TVS diodes in this power class. The junction operates from -55°C to 150°C, so the part handles the self-heating from repetitive surges as long as the average power stays within the derating curve — a single 1500 W pulse at 25°C is well within the single-pulse rating, but repetitive pulses require thermal budgeting.
Obsolete — sourcing through independent channels
For a BOM line that calls out this exact ordering code, the supply path is through verified surplus and broker inventory. The DO-214AB package and 1500 W rating are the key fit criteria — any replacement would need to match the footprint and the 145 V standoff.