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A PCB came to my shop for repair that has a capacitor soft charge (or inrush current limiter) using a IRFR5305 MOSFET and driver. The chip that failed is obviously the 6-TSOP driver labeled "AASN".

The circuit pinout is

1 MOSFET SOURCE
2 MOSFET DRAIN
3 MOSFET GATE
4 GND
5 5V
6 UNKNOWN

Searching AASN on Digikey yields both NCP4306DAHZZAASNT1G and NCP4307AASNT1G. However, none of these have pinouts that match what this PCB has, to my thinking.

I removed the AASN chip and added a PTC fuse and the circuit works again, but it would be nice to replace the failed chip and have it original again.

Before removal: enter image description here

After chip removal: enter image description here

Edit: My question is, what is that AASN chip?

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  • \$\begingroup\$ What is your question? \$\endgroup\$ Commented Mar 23 at 1:01
  • \$\begingroup\$ @Andyaka what is that AASN chip? \$\endgroup\$ Commented Mar 23 at 1:15

1 Answer 1

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After speaking with Digikey tech support, they pointed me to https://2024.hotenda.com/marking-code/search/list/AAS.html which lists AASN as MAX5903NNEUT+T which is a hot-swap controller and in stock at Digikey.

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