600 W bidirectional transient suppressor in DO-15
The P6KE400CA-B: Its 342 V reverse standoff voltage means it begins clamping above the normal line voltage on a 277 VAC or 380 VDC rail, protecting downstream semiconductors from surges without conducting during steady-state operation. Housed in the DO-204AC (DO-15) axial-lead package, it mounts through-hole and suits point-of-use transient suppression on power entry boards, industrial control inputs, and telecom rectifier outputs where the 1.1 A peak pulse current (Ipp) at 548 V clamping is sufficient for secondary-side protection.
Clamping voltage and temperature envelope
For a 380 VDC bus, this clamping margin of ~168 V above the standoff gives the downstream MOSFETs or capacitors enough headroom to survive without avalanche breakdown, provided their Vds or Vr ratings exceed 548 V. The 175°C TJ max means the device can be placed near hot components or in sealed enclosures without derating the peak pulse power at elevated ambient — the 600 W rating holds up to 25°C, then derates linearly per the datasheet curve.
Active lifecycle and sourcing posture
The bidirectional configuration (single device replaces two unidirectional diodes in anti-series) simplifies PCB layout and reduces component count on the rail.