| Price | $0.20 |
|---|---|
| Category | Components |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
The small-signal PNP that partners the BC547 - 45V, 100 mA and 500 mW in a TO-92, with hFE anywhere from 110 to 800 depending on the A, B or C grade. Use it on the high side, emitter to the positive rail, turning on when the base is pulled low: level shifting, the PNP half of a complementary pair, or a small audio stage. It is a signal transistor, not a power one - 100 mA is the ceiling, so a motor or a relay coil wants a MOSFET or a Darlington instead.
Key features
- PNP small-signal transistor in TO-92
- 45V collector-emitter, 100 mA collector current
- 500 mW dissipation, hFE 110-800 by grade
- Transition frequency around 150 MHz
- Direct complement to the BC547 NPN
- For high-side switching and audio stages
Details
Specifications
| Model | BC557 |
|---|---|
| Type | PNP bipolar transistor, small signal |
| Collector-emitter voltage | -45V |
| Collector-base voltage | -50V |
| Emitter-base voltage | -5V |
| Collector current | -100 mA |
| Power dissipation | 500 mW |
| DC current gain hFE | 110 to 800 (A/B/C grades) |
| Transition frequency | ~150 MHz |
| Package | TO-92 |
