T
treez
Guest
Hello,
We are using the BSS138PW NFET to switch off an IC by pulling a pin low. (it does this once per day for 10 years plus) . In so doing, the NFET suddenly discharges a 10uF ceramic capacitor, as in the schematic attached.
The current spike in the FET (during the discharge) goes up to 4A and lasts 15us.
The BSS138PW datasheet on page 2 states that 1.2A is the maximum current allowed, and states that even this is only allowed for 10us maximum.
Do you think we are going to see this FET fail within the ten year warrantee period?
Schematic, waveform and LTspice simulation are attached.
BSS138PW datasheet
https://assets.nexperia.com/documents/data-sheet/BSS138PW.pdf
We are using the BSS138PW NFET to switch off an IC by pulling a pin low. (it does this once per day for 10 years plus) . In so doing, the NFET suddenly discharges a 10uF ceramic capacitor, as in the schematic attached.
The current spike in the FET (during the discharge) goes up to 4A and lasts 15us.
The BSS138PW datasheet on page 2 states that 1.2A is the maximum current allowed, and states that even this is only allowed for 10us maximum.
Do you think we are going to see this FET fail within the ten year warrantee period?
Schematic, waveform and LTspice simulation are attached.
BSS138PW datasheet
https://assets.nexperia.com/documents/data-sheet/BSS138PW.pdf