Transient suppression for 128 V rails
The 1.5SMC150AS_R1_00001: With a 128 V reverse standoff voltage and a 207 V clamping point at 7.2 A peak pulse current, it sits on a 128 V DC bus or a 90 V AC line (rectified) and shunts transients that exceed the standoff before they reach the downstream silicon.
Clamp voltage and peak current — the real protection envelope
The 207 V maximum clamping voltage at Ipp defines the voltage the protected circuit must survive. For a 128 V nominal rail, the TVS holds the transient to 207 V — a downstream MOSFET rated at 250 Vds has 43 V of headroom. The 7.2 A peak pulse current at the 10/1000 µs test waveform is the current the diode can sink; the upstream fuse or PTC must open before the TVS reaches its thermal limit under repetitive surges.
Board-fit and temperature range
The tape-and-reel or cut-tape packaging suits both prototyping reels and production pick-and-place.