2SC5658-R-MS
MSKSEMI
Needs validationmedium risk
2SC5658-R-MS is a SOT-723 NPN candidate with derating limits.
Best Alternatives to MMBT3904M
MMBT3904M is an active SOT-723 NPN transistor. Provided alternatives need FAE review because pinout is not verified.
AI replacement insight
Electrical riskmedium
Several candidates have lower IC or fT.
Package risklow
Kept parts list SOT-723.
Firmware risklow
Discrete BJT; no firmware.
Sourcing riskmedium
Some close parts are obsolete.
Can it be replaced directly?
No verified pin-compatible replacement is proven by the provided data.
Best replacement path
Start with 2SC5658-R-MS for low-current use, then verify pinout, IC, fT, and thermal margin.
Main risk
Unverified pinout plus lower current or frequency ratings.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | MMBT3904M | 2SC5658-R-MS | PNT723T503E0-2 | MMBT5551M3T5G | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-723 | SOT-723 | SOT-723 | SOT-723 | SOT-723 — same package; PNT723T503E0-2: same package; MMBT5551M3T5G: same package |
| Pinout | 3 pins; map missing | 3 pins; map missing | 3 pins; map missing | 3 pins; map missing | 3 pins; map missing — not pin verified; PNT723T503E0-2: not pin verified; MMBT5551M3T5G: not pin verified |
| Voltage | 40 V | 50 V | 50 V | 160 V | 50 V / 160 V — meets 1.1x rule; PNT723T503E0-2: meets 1.1x rule; MMBT5551M3T5G: large margin |
| Current | 200 mA | 100 mA | 150 mA | 60 mA | 100 mA / 150 mA / 60 mA — 50% of target; PNT723T503E0-2: 25% lower; MMBT5551M3T5G: severe derating |
| Application | hFE 100-300; fT 300MHz | hFE 180-390; fT 180MHz | hFE 250-560; fT missing | - | hFE 180-390; fT 180MHz / hFE 250-560; fT missing — slower device; PNT723T503E0-2: gain range shifts high |
| Temperature | -55 to 150C | - | - | -55 to 150C | -55 to 150C — same range |
Application & sourcing insights
Questions & answers
2SC5658-R-MS is the closest kept candidate, but it needs pinout and derating review.