BC817-40
Nexperia USA Inc.
Needs validationmedium risk
BC817-40 is the closest catalog candidate for BC817-25 with gain-bin caveats.
Best Alternatives to BC817-25
BC817-25 is an active SOT-23 NPN transistor rated 45V and 500mA. BC817-40 is the closest listed candidate, but pinout and gain-bin checks are still required.
AI replacement insight
Electrical riskmedium
hFE or power may differ.
Package riskmedium
SOT-23 matches; pinout absent.
Firmware risklow
Discrete BJT.
Sourcing risklow
Target and kept options are active.
Can it be replaced directly?
No verified pin-compatible replacement is proven from the provided fields.
Best replacement path
Start with BC817-40, then verify pinout, hFE rank, and power rating.
Main risk
Gain-bin and unverified pinout evidence.
Recommended alternatives
1Alternative comparison matrix
| Feature / factor | BC817-25 | BC817-40 | MMBTA06 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT-23 | SOT-23 | SOT-23 — same outline; MMBTA06: same outline | |
| Pinout | 3-pin BJT | 3-pin BJT | 3-pin BJT | 3-pin BJT — pin roles absent; MMBTA06: pin roles absent | |
| Voltage | 45V | 45V | 80V | 45V / 80V — VCEO same; MMBTA06: VCEO higher | |
| Current | 500mA | 500mA | 500mA | 500mA — IC same; MMBTA06: IC same | |
| Application | hFE 160-400 | hFE 250-600 | hFE 100 | hFE 250-600 / hFE 100 — higher gain bin; MMBTA06: drive may change | |
| Power | 300mW | 250/300mW | 225mW | 250/300mW / 225mW — ES conflict; MMBTA06: thermal derate |
Application & sourcing insights
Questions & answers
BC817-40 is the closest candidate in the provided data, but its gain bin and pinout need review.