Thyristor Short in field deployment

[Srinivas_02]

Hi Team,

We have used a Thyristor for our 24v input protection and conducted lab tests for 24v inputs by feeding upto 2kv surge. When the device is tested with normal regulated power supply or SMPS. The device is ok but when it is deployed in field the Thyristors are getting short. What could be the reason. Kindly help us to resolve.

Part Number: SMP100LC-35

For every 1000 lot we are getting back atleast 20 device back to the factory. Please let me know if you need any other clarification or details.

Thanks

Srinivas

[Peter BENSCH]

Welcone @Srinivas_02, to the community!

The SMP100LC-35 are extensively tested during manufacture, so a 2% failure rate is most certainly due to electrical stress, most likely because of the 2kV test you mentioned. Unfortunately, you have not given any parameters of this test, so no one can estimate what happens. The standards to which the SMP100LC-35 is compliant are listed on the first two pages of the datasheet.

Regards

/Peter