AN303

Conclusion

Doc ID 3654 Rev 3

11/13

3

Conclusion

The SCR or TRIAC choice does not depend only on the voltage, the rated current and the

sensitivity. Other parameters must be taken into account to ensure appropriate operation.

The value of this parameter varies with

●

gate current pulse (amplitude, shape and width)

●

temperature

●

control circuit (in the case of sensitive SCRs)

●

direction of current flow

TRIAC and SCR applications, involving highly inductive loads or loads with considerable

power variations, are the main applications for which the latching current must be given

particular consideration.

Taking into account these aspects, the designer can obtain satisfactory operation of the

circuit in industrial applications.