TVS Series

Posted in TVS Series

Introduction

TVS Diodes (Transient Voltage Suppressor Diodes), SMD transient overvoltage suppressor, also called diodes, is a resistor with symmetry of voltage and current. TVS is based on semiconductor materials such as silicon or germanium, the termination is composed by P-type semiconductor and N-type semiconductor (PN junction). TVS is parallel with protected circuit, when the transient voltage exceeds the normal operating voltage of the circuit and diodes breakdown and provides a path for transient current so that it can avoid the internal circuit struck by overvoltage or burned by over current. Due to area of TVS is the larger, it has the advantage of transient current release with proper protective function.

Solution

Application

  1. High Speed digital circuitry application
  2. Portable products for I/O port
  3. Cellular handsets
  4. Networking system
  5. High Definition Multi-Media Interface (HDMI)

Operation Theory

Parameters

  1. Max. forward voltage V f(max)(at specific current and temp.)
  2. Max. forward current I f(max)(at specific temp.)
  3. Max. reverse cureent I r(max)(at specific temp.)
  4. Reverse rated voltage (PIV) or (PRV) or breakdown V(BR)(at specific temp.)
  5. Max. capacitance.
  6. Max. reverse recovery time (TRR)
  7. Max. working temp.

Features

  • TVS/ESD Diode features:
    TVS is connected in parallel with the protected circuit. TVS will breakdown when transient voltage exceeds normal working voltage of circuit and make transient current passed in ultra-low-resistance through TVS and protect components. Before voltage recovering to normal value, the protected circuit will keep the clamping voltage. While transient pulse eliminated. TVS will recover to high resistance and the circuit becomes normal voltage.

    VRWM:Working Voltage IR:Reverse Current
    VBR:Breakdown Voltage IT:Test Current
    VC:Clamping Voltage Ipp:Clamping Current
    PD:VCxIPP
  • Schottky Diode Features:
    Schottky diodes are mainly applied in high frequency and high-speed switching, known as hot carrier diode. Schottky diode is a semiconductor (usually n-type) doped by some gold, silver or platinum metal combination. Therefore, the junction is not a PN junction. The Schottky diode is a fast switching diode as a feature for application. It’s often for high-frequency signal rectifier, such as microwave circuit. The switching time which conduction changed to non-conducting is more short than PN diode (about 0.3 ~ 0.5 V).
  • Zener Diode Features:
    While the diode reverse breakdown occurs, the reverse current increase rapidly. The feature curve is almost vertical with the horizontal axis. The current is changed within large range and the base voltage won’t change. Taking the advantage can achieve the purpose of stabilizing the voltage.
    VR:Reverse Voltage IR:Reverse Current
    VZ:ZENER Voltage (subject to IZT test voltage)
    IZK:Min. Adjusted Current
    IZM:Max. Adjusted Current
    PZM:Max. Consumption energy=IZM*VZ
    ZZT:IZT the corresponding dynamic impedance ZZK:IZM the corresponding dynamic impedance * Dynamic impedance is one of indicators to judge if the adjusted voltage performance of Zener diodes is good or not. The smaller value of RZ, the better performance of non-voltage adjustment*