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Best Alternatives to MMBT5551

Package: TO-236-3, SC-59, SOT-23-3Good-Ark SemiconductorBipolar (BJT)Series: -Package: Tape & Reel (TR) Cut Tape (CT) Digi-Reel®Current - Collector (Ic) (Max): 600 mAVoltage - Collector Emitter Breakdown (Max): 160 VCurrent - Collector Cutoff (Max): 50nA (ICBO)

No pin-compatible MMBT5551 replacement was verified from these candidates. MMBTA44 is only a review candidate for high-voltage, low-current designs.

AI replacement insight

Electrical riskhigh

most candidates fail voltage or current

Package riskmedium

SOT-23 listed but pinout missing

Firmware risklow

discrete BJT has no firmware

Sourcing riskmedium

PDF checks are pending

Can it be replaced directly?

No direct replacement is verified from the reviewed list.

Best replacement path

Use exact MMBT5551 or a verified MMBT5551 cross; review MMBTA44 only for low-current use.

Main risk

Pinout is unverified and current ratings differ.

Recommended alternatives

1
MMBTA44 package
MMBTA44

Yangzhou Yangjie Electronic Technology Co.,Ltd

Needs validationhigh risk

MMBTA44 is a high-voltage NPN SOT-23 option, but its current rating is lower.

View details

Alternative comparison matrix

Feature / factorMMBT5551MMBTA44Alt 2Alt 3Compatibility / risk
PackageSOT-23SOT-23SOT-23 — same package name
Pinout3-pin BJT3-pin BJT3-pin BJT — pin functions absent
Voltage160V VCEO400V VCEO400V VCEO — meets voltage margin
Current0.6A0.2A0.2A — large derating
Temperature-55..150C-55..150C-55..150C — ES match

Application & sourcing insights

Questions & answers

No direct alternative is verified here. MMBTA44 is only a high-voltage, low-current review candidate.