AO3480C
Alpha & Omega Semiconductor Inc.
Needs validationmedium risk
AO3480C is a stronger SOT-23 N-MOSFET candidate for SI2302 after pinout and gate-drive review.
Best Alternatives to SI2302
SI2302 is a 20V SOT-23 N-channel MOSFET. Several SOT-23 N-MOSFETs look usable, but pinout and gate-drive checks are required.
AI replacement insight
Electrical riskmedium
Vth and Qg can change switching loss.
Package riskmedium
Package matches, pinout does not.
Firmware risklow
Discrete MOSFET, no firmware.
Sourcing riskmedium
AO3400A has NRND evidence.
Can it be replaced directly?
Direct replacement for SI2302 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
Start with AO3480C or AO3400C, then verify pinout, RDS(on) at drive voltage, Qg, and thermal limits.
Main risk
Unverified SOT-23 pinout and gate-drive differences.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | SI2302 | AO3480C | AO3400C | AO3400A | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 | SOT-23 — same package; AO3400C: same package; AO3400A: same package; IRLML6244TRPBF: same package |
| Pinout | SI2302 pinout | not provided | not provided | not provided | not provided — must verify GDS order; AO3400C: must verify; AO3400A: must verify; IRLML6244TRPBF: must verify |
| Voltage | 20 V | 30 V | 30 V | 30 V | 30 V / 20 V — meets margin; AO3400C: meets margin; AO3400A: meets margin; IRLML6244TRPBF: no 1.1x margin |
| Current | 3 A | 6.2 A | 6.2 A | 5.7 A | 6.2 A / 5.7 A / 6 A — higher rating; AO3400C: higher rating; AO3400A: higher rating; IRLML6244TRPBF: higher rating |
| Power | Qg 4 nC | 6-12 nC | - | - | 6-12 nC — slower drive possible |
| Interface | Vth 0.5-1.0V | - | 1.3-2.3V | - | 1.3-2.3V / not provided — needs gate margin; IRLML6244TRPBF: logic drive unknown |
| Lifecycle | Active | - | - | Not For New Designs | Not For New Designs — sourcing risk |
Application & sourcing insights
Questions & answers
Verified drop-in options for SI2302 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.