The STMicroelectronics P6KE15CA is a 600W bidirectional TRANSIL™ TVS diode in a DO-204AC (DO-15) axial-lead through-hole package. It is designed for general-purpose transient voltage suppression on unipolar or bipolar lines where the working voltage sits at 12.8V reverse standoff. The bidirectional construction means a single device clamps both positive and negative transients, saving a board position compared to back-to-back zeners.
The 14.3V minimum breakdown voltage sets the threshold where the diode starts conducting — for a 12V nominal rail, this provides a guard band above the steady-state supply, so the device stays out of conduction during normal operation. The 27.2V maximum clamp at 147A (8/20µs waveform) defines the voltage the protected circuitry sees during a surge; a downstream DC-DC converter or linear regulator needs to survive that peak without damage. The 600W peak pulse rating is the energy-handling envelope for a single 10/1000µs pulse — derate for repetitive events or elevated ambient temperature.
NRND — what it means for procurement
ST has not issued a formal last-time-buy notice as of the current record, but the part is no longer the recommended choice for new board layouts.