# What rating is the effect on-state current?

Latest Updated:08/01/2007

## Question:

What rating is the effective on-state current?

## Answer:

It is defined as an effective value (Root Mean Square) of the current that is allowed to continuously flow through a thyristor or triac under a specific condition.

The effective on-state current is limited by the condition that the current density at the junction, current capacity of constituent components, temperature rise and so on do not exceed the permissible values. Therefore, since the effective on-state current rating is determined by element design and does not change even if the cooling condition is changed, the product must not be used with a current exceeding this value regardless of the ambient temperature, the case temperature, or the waveform of the current.

The effective on-state current is limited by the condition that the current density at the junction, current capacity of constituent components, temperature rise and so on do not exceed the permissible values. Therefore, since the effective on-state current rating is determined by element design and does not change even if the cooling condition is changed, the product must not be used with a current exceeding this value regardless of the ambient temperature, the case temperature, or the waveform of the current.

**Suitable Products**

Diodes for Constant Voltage |