Surge protection for 77.8V DC rails
The 1.5KE91CA A0G: With a peak pulse power rating of 1500W (10/1000µs waveform), it absorbs surge energy that would otherwise damage sensitive downstream components in industrial control, telecom, and general-purpose power supply circuits.
Clamping voltage and breakdown threshold
The reverse standoff voltage is 77.8V typical — this is the maximum DC voltage the diode can block without conducting. This 125V clamp ceiling defines the voltage stress the protected circuit must survive during a surge event. The bidirectional configuration (single channel) means the clamping characteristic is symmetrical for positive and negative transients — useful on AC-coupled lines or bipolar signal buses where polarity cannot be guaranteed.
Package and thermal considerations
Housed in a DO-201AA (DO-27) axial leaded package, the through-hole footprint suits high-reliability soldering and board-level rework. The operating junction temperature range spans -55°C to 175°C, covering industrial and automotive under-hood ambient conditions without derating at the upper end.