The P4SMAJ90CA is a bidirectional SMD transient voltage suppressor diode manufactured by Diotec Semiconductor, designed for overvoltage and ESD protection in commercial and industrial applications. It features a standoff voltage (VWM) of 90 V, a breakdown voltage (VBR) of 123 V, and a peak pulse power dissipation of 400 W with a 10/1000 µs waveform, combined with very fast response time for transient suppression. The device operates over a junction temperature range of -50°C to +150°C and has a steady-state power dissipation rating of 1 W at 75°C, with a maximum forward voltage of 3.5 V at 25 A. The bidirectional configuration allows electrical characteristics to apply in both directions, making it suitable for protecting sensitive circuits against voltage transients, free-wheeling applications, and ESD events in power supply and signal line protection circuits.