ISO7762: Surge Capability

Brian Wang0928

Part Number: ISO7762

Tool/software:

Customer did a surge test with 9.6KV and 1.2/50uS impulse voltage. However, the device was broken and arcing oberseved. in the d/s, it specifies the surge capability is up to 12.8KV.

Could you help to clarify this issue?

Regards

Brian

6 months ago

0 Aaditya V. 6 months ago

TI__Mastermind 18525 points

Hi Brian,

Thanks for reaching out.

The VIOSM Surge specification in the datasheet tests using the "two terminal method" which is when all left side pins are tied as one pin and all right side pins are tied as the second pins. The surge is then applied across the two sides to measure the VIOSM spec while the device is submerged and tested in oil, as per the standard.

If the customer's test is conducted in air, not oil, then VIMP spec should be considered. the VIMP spec is tested in air, resulting in VIMP = 8kV for DW package. Considering this, the customer test results of 9.6kV would align with VIMP assuming that the test is not performed in oil. Please confirm the test setup of the customer to verify.

Additional Resource:

[FAQ] What is Surge Isolation Voltage (VIOSM)? - Isolation forum - Isolation - TI E2E support forums

[FAQ] What is Maximum Impulse Voltage (VIMP)? - Isolation forum - Isolation - TI E2E support forums

Regards,
Aaditya Vittal