What are TVS Diodes?

TVS is a type of the Zener diodes, and uses the characteristics in the breakdown region of the diode. This diode is used to make reference voltage circuits using the characteristics of a voltage to stay almost constant regardless of the current flowing, and it is also used to protect circuits or element by absorbing surges.

  • TVS diode symbol
    When current IR flows, the loss: VBR × IR occurs.

Type of TVS and Zener diodes, and how to use them

1.Surge protector diodes

These are generally called TVS (Transient Voltage Suppressor), and are used as a voltage clamping surge protector.  The clamping voltage is expressed as VCL.
This diode is categorized as a power semiconductor and is made to absorb a large amount of energy for a short period in order to ensure a low operating resistance and high current rating. The surge voltage Vp is absorbed and reduces it up until VCL.

2.Voltage regulator diodes

By running a slight current through the Zener diode, it is uses the voltage between K and A as a reference voltage.
This diode is generally not made for large current flow, and is categorized as a small-signal semiconductor.
When Vi>VZ, even if Vi and IZ change, VZ becomes an almost constant value.

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