MMBT3904_R1_000Z8
Panjit International Inc.
Needs validationhigh risk
MMBT3904 may fit low-stress NPN roles but is not a direct BC817-40 replacement.
Best Alternatives to BC817-40
BC817-40 is a 45V, 500mA NPN SOT-23 transistor. Listed alternatives need FAE review because pinout and ratings are not fully aligned.
AI replacement insight
Electrical riskhigh
kept candidates derate I or V/P
Package riskmedium
SOT-23 matches, pinout unverified
Firmware risklow
discrete transistor
Sourcing riskmedium
catalog matched, PDF pending
Can it be replaced directly?
No pin-compatible replacement is verified from these candidates.
Best replacement path
Prefer another BC817-40 or BC817 family source with verified SOT-23 pinout and equal ratings.
Main risk
Lower current, power, or voltage ratings may overstress the substitute.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | BC817-40 | BC846C | MMBT3904_R1_000Z8 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 — same package; MMBT3904_R1_000Z8: same package | |
| Pinout | 3-pin BJT | 3-pin, unverified | 3-pin, unverified | 3-pin, unverified — pin functions not shown; MMBT3904_R1_000Z8: pin functions not shown | |
| Voltage | 45 V | 65 V | 40 V | 65 V / 40 V — higher VCEO; MMBT3904_R1_000Z8: below target | |
| Current | 500 mA | 100 mA | 200 mA | 100 mA / 200 mA — major derating; MMBT3904_R1_000Z8: large derating | |
| Power | 300 mW | 200 mW | 225 mW | 200 mW / 225 mW — less Pd; MMBT3904_R1_000Z8: less Pd |
Application & sourcing insights
Questions & answers
From this set, none is a full replacement. Use a verified BC817-40 or equal BC817-family NPN first.