P4KE91A – 91 V 400 W Uni-Directional TVS Diode | DO-41 | High-Voltage Industrial Surge Protector SEP

The P4KE91A is a 91 V, 400 W uni-directional TVS diode designed to protect 85–91 V DC rails, industrial controllers, telecom power systems, and sensitive electronic modules from high-energy surges and transient spikes. Its fast avalanche conduction and regulated breakdown window ensure stable and reliable clamping during lightning surges, inductive switching, and overload events.

Key Specifications

• VRWM: 77.8 V

• VBR: 86.5–95.5 V

• VC: 125 V

• Peak Pulse Power: 400 W

• Package: DO-41

• Response Time: < 1 ns

Applications

• 85–91 V DC bus surge protection

• Telecom line and power system suppression

• Industrial equipment and PLC I/O protection

• DC converters and SMPS front-end surge guarding

• Field instrumentation and control modules

Features

• Strong 400 W transient handling capability

• Accurate clamping suitable for ~90 V DC systems

• Fast avalanche response time (< 1 ns)

• Rugged DO-41 axial package for long service life

• Low leakage and stable breakdown behavior