Product Description

SMAJ78A is a unidirectional TVS diode with excellent performance, designed for applications such as communications, power supplies, and industrial control. It has fast response speed and strong clamping ability, and can effectively resist electrostatic discharge (ESD), lightning surges, and other transient overvoltage shocks. It is an ideal choice for protecting sensitive electronic equipment from voltage transient shocks!

Main Technical Parameters

  • Working voltage:78V
  • Breakdown voltage:86.7V-95.8V
  • Peak pulse current: up to 3.2A (8/20μs waveform)
  • Maximum clamping voltage:126V
  • Power level: 400W
  • Polarity: Unidirectional

Features and Advantages

  • Low profile package
  • Ideal for automated placement
  • 400 Watt peak pulse power capability with a 10/1000μs waveform
  • For surface mounted applicatons to optimize board space
  • Excellent clamping capability
  • Very fast response time
  • Low incremental surge resistance

Working Principle

  • Normal state
    When the circuit voltage is lower than the reverse cutoff voltage, the device is in high impedance state (cutoff state), which has almost no effect on the circuit.
  • Transient voltage trigger
    When the voltage exceeds the breakdown voltage, the device quickly enters the low impedance state (avalanche breakdown), discharges the excess energy to the ground through itself, and clamps the voltage below the clamping voltage.

Typical Applications

  • DC power supply protection
  • I/O interface and data lines
  • Automotive and industrial electronics
  • Telecom and networking equipment
  • Surge protection for sensors and controllers

Product Line

For datasheet and more details of SMAJ78A, please visit the website:

https://en.semiware.com/product-general-tvs/smaj78a

About Semiware
Semiware has a comprehensive product lineup of circuit protection device products.The company leverages its technology in the semiconductor field and application background in end products to serve customers in the electronics, automotive and industrial markets. For more information, please visit semiware official website: https://en.semiware.com/