The internal circuit damage of a high-voltage product during the negative-current-triggered (NCT) latch-up test

A novel failure mechanism of the high-voltage (HV) product during the negative-current-triggered (NCT) latch-up test is found. From the failure analysis and simulation results, the failure is identified as the unexpected parasitic-bipolar transistors turn-on induced the regulator malfunction to result in the low-voltage (LV) component damage.