
Vishay Siliconix
SI4401FDY-T1-GE3 is a close SO-8 P-MOSFET candidate for AO4407C, pending pinout and loss checks.
AO4407C is a 30V SO-8 P-channel MOSFET. The closest catalog candidates need pinout and loss review before use.
RDS(on) and thermal loss need checking.
Kept candidates list SO-8.
No firmware interface.
Lifecycle data is mixed.
No verified pin-compatible replacement is confirmed from the provided data.
Review SI4401FDY-T1-GE3 first; it is the closest electrical SO-8 P-MOSFET candidate.
Pinout is not verified, and RDS(on) may increase conduction loss.

Vishay Siliconix
SI4401FDY-T1-GE3 is a close SO-8 P-MOSFET candidate for AO4407C, pending pinout and loss checks.
| Feature / factor | AO4407C | SI4401FDY-T1-GE3 | SI4435DYTRPBF | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 — same package name; SI4435DYTRPBF: same package name | |
| Pinout | AO4407C pinout | missing | missing | missing — must verify pins; SI4435DYTRPBF: must verify pins | |
| Voltage | -30V | -40V | -30V | -40V / -30V — higher VDS; SI4435DYTRPBF: same VDS | |
| Current | -14A | -14A | -8A | -14A / -8A — same listed ID; SI4435DYTRPBF: lower ID | |
| Resistance | 11.5mΩ max | 14.2mΩ max | 20mΩ | 14.2mΩ max / 20mΩ — higher loss; SI4435DYTRPBF: higher loss |
From the provided data, SI4401FDY-T1-GE3 is the closest candidate, but it still needs pinout and loss review.