SA78A 78.0 V 500 W Uni-Directional TVS Diode | DO-15 | Industrial & Power-Line Surge Protector HORNBY

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The SA78A is a 78 V, 500 W uni-directional TVS diode engineered to protect industrial power rails, relay drivers, control equipment, and communication interfaces from high-energy transient surges. Its fast avalanche action and well-defined breakdown voltage ensure stable and reliable clamping during inductive switching, line disturbances, and voltage spikes.

Key Specifications

  • VRWM: 62.4 V

  • VBR: 74.182.0 V

  • VC: 126 V

  • Peak Pulse Power: 500 W

  • Package: DO-15

  • Response Time: < 1 ns

Applications

  • Surge protection for industrial power systems

  • Relay, solenoid, and inductive load suppression

  • DC power bus and SMPS input protection

  • Control panels and automation equipment

  • Communication and signaling line protection

Features

  • 500 W peak pulse surge capability

  • Fast uni-directional avalanche clamping

  • Ultra-fast response time (<1 ns)

  • Rugged DO-15 glass-passivated axial package

  • Low leakage current with stable avalanche behavior