
Nexperia USA Inc.
BC817-40 is a low-current NPN SOT-23 alternative needing pinout and load review.
SS8050 is a 1.5A NPN SOT-23 transistor. Most listed NPN options are lower-current parts and need FAE review.
kept parts are 0.5A vs 1.5A
SOT-23 matches but pinout is missing
discrete BJT, no firmware
kept parts are Active
No pin-compatible replacement is proven from the provided evidence.
Start with BC817-40 or MMBTA06 only for derated, low-current circuits.
Collector current and unverified pinout.

Nexperia USA Inc.
BC817-40 is a low-current NPN SOT-23 alternative needing pinout and load review.
| Feature / factor | SS8050 | BC817-40 | MMBTA06 | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23, 3-pin | SOT23, 3-pin | SOT-23, 3-pin | SOT23, 3-pin / SOT-23, 3-pin — package family matches; MMBTA06: mechanical match only | |
| Pinout | unknown | unknown | unknown | unknown — not proven; MMBTA06: not proven | |
| Voltage | 25V | 45V | 80V | 45V / 80V — meets 1.1x rule; MMBTA06: meets 1.1x rule | |
| Current | 1.5A | 0.5A | 0.5A | 0.5A — major derating; MMBTA06: major derating | |
| Power | 300mW | 250-300mW | 225mW | 250-300mW / 225mW — source varies; MMBTA06: thermal risk |
From the provided list, BC817-40 or MMBTA06 may work only in low-current derated circuits.