FMMT493
FUXINSEMI
Needs validationmedium risk
FMMT493 is a strong SOT-23 NPN candidate, but power, gain and pinout need review.
Best Alternatives to BC846
BC846 is a 65V NPN SOT-23 BJT. Several SOT-23 NPN parts are possible, but none here is proven pin-compatible.
AI replacement insight
Electrical riskmedium
Pd, fT and gain vary.
Package riskmedium
SOT-23 matches, pinout missing.
Firmware risklow
Discrete BJT.
Sourcing riskmedium
Some candidates obsolete or derated.
Can it be replaced directly?
No direct pin-compatible replacement is verified from the provided evidence.
Best replacement path
Start with FMMT493, then verify pinout, Pd, hFE and fT.
Main risk
Unverified pinout and weaker power or frequency ratings.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | BC846 | FMMT493 | PBSS4160T | BC847C | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 | SOT-23 — same package; PBSS4160T: same package; BC847C: same package |
| Pinout | 3 pins | 3 pins | 3 pins | 3 pins | 3 pins — mapping missing; PBSS4160T: mapping missing; BC847C: mapping missing |
| Voltage | 65V VCEO | 100V VCEO | 60V VCEO | 45V VCEO | 100V VCEO / 60V VCEO / 45V VCEO — margin ok; PBSS4160T: below target; BC847C: large downgrade |
| Current | 100mA | 1A | 1A | 100mA | 1A / 100mA — higher rating; PBSS4160T: higher rating; BC847C: same rating |
| Power | 350mW | 250mW | - | 200mW | 250mW / 200mW — derate needed; BC847C: lower Pd |
| Application | general BJT | - | low VCEsat BJT | - | low VCEsat BJT — may help switching |
Application & sourcing insights
Questions & answers
FMMT493 is the strongest listed candidate, but it still needs pinout, power and gain review.