# What is the difference between Vrrm and Vrm

• yugeci
In summary, peak inverse voltage is the maximum amount of voltage that can be blocked on the negative cycle of a sine wave. The difference between maximum reverse voltage and maximum repetitive reverse voltage is that the former can only be blocked once, while the latter can be blocked repeatedly without causing damage. The normal operating voltage for a rectifier should be less than Vrrm, and Vrm is only relevant in the case of a fault, such as a lightning strike.
yugeci
Hello,

I know peak inverse voltage is the maximum amount of voltage can block, and that it is the maximum value on the negative cycle of the sine wave. But what is the difference between maximum reverse voltage and maximum repetitive reverse voltage? What does the repetitive imply? Does the former mean the maximum voltage that can be blocked in single wave?

The device can block the maximum reverse voltage just once (and probably only for short time). After that has happened, the device may be damaged so it does not meet the rest of its specification.

The maximum repetitive reverse voltage can be blocked repeatedly, any number of times, without causing any damage.

For a rectifier, the normal operating voltage should be less than Vrrm. Usually, Vrm is only relevant if there is a fault, for example if there was a lightning strike that hit the mains power supply and caused a voltage spike.

1 person
Thanks. That explains it very well.

## What is the difference between Vrrm and Vrm?

Vrrm stands for "Reverse Recovery Voltage" and Vrm stands for "Repetitive Peak Reverse Voltage". Vrrm refers to the maximum voltage that a diode can withstand in its reverse direction without breaking down. Vrm, on the other hand, refers to the maximum voltage that a diode can withstand in its reverse direction during repeated cycles. In simpler terms, Vrrm is a single instance rating, while Vrm is a repetitive rating.

## Do Vrrm and Vrm have the same value?

No, Vrrm and Vrm do not necessarily have the same value. Vrrm is typically higher than Vrm as it represents the maximum voltage a diode can withstand in a single instance, while Vrm represents the maximum voltage it can withstand during repeated cycles.

## Why do Vrrm and Vrm ratings matter?

Vrrm and Vrm ratings are important because they help determine the maximum voltage that a diode can handle in its reverse direction. This is crucial in preventing damage to the diode and ensuring its proper functioning in a circuit.

## What happens if the Vrrm or Vrm rating is exceeded?

If the Vrrm or Vrm rating is exceeded, the diode may break down and become permanently damaged. This can result in the diode failing to function as expected in a circuit or even causing damage to other components in the circuit.

## Can Vrrm and Vrm ratings be increased?

No, Vrrm and Vrm ratings cannot be increased as they are intrinsic properties of the diode. However, manufacturers may offer diodes with higher Vrrm and Vrm ratings for specific applications, but these are not technically increasing the ratings of the diode itself.

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