BC557B is a small signal PNP transistor suitable for TV and home appliance equipment. It has high gain and low saturation voltage, making it suitable for small load switch transistor applications.
This document is a datasheet for the BC557B, a silicon epitaxial planar PNP transistor available in TO-92 packages (Bulk and Ammopack). It is designed for through-hole PCB assembly and is well-suited for TV and home appliance equipment as a small load switch transistor with high gain and low saturation voltage.
The datasheet provides absolute maximum ratings, thermal data, and comprehensive electrical characteristics including collector-emitter breakdown voltage, DC current gain, and transition frequency. It also includes detailed mechanical dimensions for both the standard TO-92 package and the TO-92 Ammopack shipment variant.
| Collector-Emitter Voltage (Vceo) | -45 V |
|---|---|
| Collector Current (Ico) | -100 mA |
| Total Dissipation (Prot) | 500 mW |
| Storage Temperature (Tstg) | -65 to 150 °C |
| DC Current Gain (hfe) | 220 to 475 |
| Transition Frequency (fT) | 100 MHz |
The complementary NPN type is the BC547B.
Yes, the TO-92 package is suitable for through-hole PCB assembly.
The transistor is available in TO-92 Bulk and TO-92 Ammopack packages.