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Best Alternatives to AO3400

Package: SOT-23Alpha & Omega Semiconductor Inc.FETsMOSFET Type: N-channelDrain-Source Voltage (VDS): 30 VContinuous Drain Current (ID): 5.8 ARDS(on) at VGS = 10 V: 22 mΩ typ, 30 mΩ maxRDS(on) at VGS = 4.5 V: 24 mΩ typ, 30 mΩ max

AO3400 is an obsolete 30V N-channel SOT-23 MOSFET. No listed option is verified pin-compatible from the provided data.

AI replacement insight

Electrical riskmedium

RDS(on) and ratings differ or are missing.

Package riskmedium

Package matches, pinout is unverified.

Firmware risklow

Discrete MOSFET; no firmware.

Sourcing riskmedium

Target obsolete; one option is NRND.

Can it be replaced directly?

No verified direct replacement is proven by the provided fields.

Best replacement path

Start with NP3400MR-S-G, then verify pinout, RDS(on), PD, and thermal limits.

Main risk

Pinout and MOSFET loss/thermal limits are not fully proven.

Recommended alternatives

2
NP3400MR-S-G package
NP3400MR-S-G

natlinear

Needs validationmedium risk

NP3400MR-S-G is a close AO3400 candidate but needs FAE checks.

View details

Alternative comparison matrix

Feature / factorAO3400NP3400MR-S-G03N06L-BAlt 3Compatibility / risk
PackageSOT-23-3LSOT-23-3LSOT-23-3LSOT-23-3L — same package text; 03N06L-B: same package text
Pinout3 pins3 pins3 pins3 pins — pin map missing; 03N06L-B: pin map missing
Voltage30V30V60V30V / 60V — no 1.1x margin; 03N06L-B: meets margin
Current5.8A5.8A3A5.8A / 3A — same ID; 03N06L-B: large derating
Resistance21mΩ@10V24mΩ@4.5V<100mΩ24mΩ@4.5V / <100mΩ — test point differs; 03N06L-B: more heat

Application & sourcing insights

Questions & answers

NP3400MR-S-G is the closest listed candidate, but it still needs pinout and electrical review.