ProjectsPricingInsights

Best Alternatives to PMBT3904

Package: SOT-23PAKER Microelectronics (Shenzhen) Co., Ltd.TransistorsTransistor Type: NPNCollector-Emitter Voltage (VCEO): 40 VCollector Current (IC): 200 mAPower Dissipation (PC): 200 mWDC Current Gain (hFE): 100 - 400

PMBT3904 is an NPN SOT-23 BJT. Several NPN SOT-23 parts may work, but no pin-compatible replacement is verified here.

AI replacement insight

Electrical riskmedium

Check V/I/P, hFE, VCE(sat), and fT.

Package riskmedium

SOT-23 matches, pin functions missing.

Firmware risklow

Discrete BJT; no firmware impact expected.

Sourcing riskmedium

Avoid obsolete options for new builds.

Can it be replaced directly?

No verified pin-compatible replacement is proven from the supplied fields.

Best replacement path

For switching, review PBSS4160T first; for common NPN use, review MMBT4401 with derating.

Main risk

Pinout is not verified and some candidates have lower fT or no voltage margin.

Recommended alternatives

3
PBSS4160T package
PBSS4160T

Nexperia USA Inc.

Needs validationmedium risk

PBSS4160T is a stronger-stress NPN SOT-23 option for review.

View details

Alternative comparison matrix

Feature / factorPMBT3904PBSS4160TFMMT493MMBT4401Compatibility / risk
PackageSOT-23SOT-23SOT-23SOT-23SOT-23 — same package; FMMT493: same package; MMBT4401: same package
Pinout3 pins3 pins3 pins3 pins3 pins — pin functions missing; FMMT493: pin functions missing; MMBT4401: pin functions missing
Voltage40V60V100V40V60V / 100V / 40V — meets 1.1x rule; FMMT493: ample margin; MMBT4401: no 1.1x margin
Current200mA1A1A600mA1A / 600mA — large margin; FMMT493: ample margin; MMBT4401: higher IC
Application300MHz fT220MHz fT150MHz, 0.6V sat250MHz fT220MHz fT / 150MHz, 0.6V sat / 250MHz fT — check speed; FMMT493: slower, higher loss; MMBT4401: check speed

Application & sourcing insights

Questions & answers

PBSS4160T is the strongest active candidate for switching review, but it is not verified as drop-in.