BC557B Datasheet & Equivalents
PNP
TO-92
General Purpose
LGE
VCEO
45V
Ic Max
100mA
Pd Max
625mW
hFE Gain
180
Quick Reference
The BC557B is a PNP bipolar junction transistor in a TO-92 package, manufactured by LGE. It supports a breakdown voltage of 45V and continuous collector current of 100mA. It is widely used in switching and amplification circuits.
Technical Specifications
| Parameter | Value | Description |
|---|---|---|
| Manufacturer | LGE | Original Manufacturer |
| Package | TO-92 | Physical mounting |
| Transistor Type | BJT | Bipolar Junction Transistor |
| Category | Single | Configuration |
| Collector-Emitter Voltage (VCEO) | 45V | Max breakdown voltage |
| Collector Current (Ic) | 100mA | Max current handling |
| Power Dissipation (Pd) | 625mW | Max thermal limit |
| DC Current Gain (hFE) | 180 | Base signal amplification ratio |
| Transition Frequency (fT) | 150MHz | Max operating frequency |
| Saturation Voltage (VCEsat) | 650mV | Voltage drop when fully ON |
| Emitter-Base Voltage (Vebo) | 5V | Max emitter-base breakdown |
| Collector Cutoff Current | 100nA | Leakage current when OFF |
| Operating Temp | - | Safe junction temperature range |
Equivalent Transistors & Alternatives
| Part | Type | Package | VCEO | IC | hFE | Pd | Manufacturer / Datasheet |
|---|---|---|---|---|---|---|---|
| BC557BTA | PNP | TO-92 | 45V | 100mA | 110 | 500mW | onsemi 📄 PDF |
| 2SA1015(RANGE:200-400) | PNP | TO-92 | 50V | 150mA | 200 | 400mW | JSCJ 📄 PDF |
| KTA1266 | PNP | TO-92 | 50V | 150mA | 70 | 625mW | BLUE ROCKET 📄 PDF |
| 2SA1015 | PNP | TO-92 | 50V | 150mA | 70 | 400mW | BLUE ROCKET 📄 PDF |
| 2SA1015-GR | PNP | TO-92 | 50V | 150mA | 400 | 400mW | YFW 📄 PDF |
| BC556B | PNP | TO-92 | 65V | 100mA | 200 | 500mW | DIOTEC 📄 PDF |
| BC556BTF | PNP | TO-92 | 65V | 100mA | 110 | 500mW | onsemi 📄 PDF |
| BC556BTA | PNP | TO-92 | 65V | 100mA | 800 | 500mW | onsemi 📄 PDF |