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# What is breakdown voltage of NPN transistor?

## What is breakdown voltage of NPN transistor?

Breakdown in the opposite direction (e.g. NPN: +V to Emitter, Collector grounded) is roughly equivalent to the breakdown between the Emitter and Base. Typically this is between 5 to 7V, making the Collector-Emitter reverse voltage less than 5V.

What is zener breakdown voltage?

A normal p-n junction diode allows electric current only in forward biased condition. This sudden rise in electric current causes a junction breakdown called zener or avalanche breakdown. The voltage at which zener breakdown occurs is called zener voltage and the sudden increase in current is called zener current.

### What is the maximum voltage of a transistor?

The rating for maximum collector-emitter voltage VCE can be thought of as the maximum voltage it can withstand while in cutoff mode (no base current). This rating is of particular importance when using a bipolar transistor as a switch. A typical value for a small signal transistor is 60 to 80 V.

What is breakdown voltage rating?

The breakdown voltage of an insulator is the minimum voltage that causes a portion of an insulator to become electrically conductive. For diodes, the breakdown voltage is the minimum reverse voltage that makes the diode conduct appreciably in reverse. Some devices (such as TRIACs) also have a forward breakdown voltage.

#### What is the formula of breakdown voltage?

Eb = Vb d . (6) In plane geometry, the breakdown voltage Vb is given by Equation (7) (31–33). This equation represents the general formula of the breakdown voltage of pure gases.

How does breakdown voltage occur?

Breakdown occurs when the electric field becomes strong enough to pull electrons from the molecules of the material, ionizing them. When a voltage is applied across a piece of insulator, the electric field at each point is equal to the gradient of the voltage.

## What is voltage breakdown?

What is breakdown voltage of Zener diode?

Zener diode specifications Voltage Vz: The Zener voltage refers to the reverse breakdown voltage—2.4 V to about 200 V; can go up to 1 kV while the maximum for the surface-mounted device (SMD) is about 47 V).