ROHM BC857B Data Sheet
Summary
The BC857B is a highly reliable PNP small signal transistor designed specifically for switching and audio/AF amplifier applications, offering high current gain (hFE). This technical manual provides essential engineering deep-dives, including absolute maximum ratings, detailed electrical characteristics, performance curves, and optimal operating conditions across various temperatures. It is perfect for electronics engineers, circuit designers, and hardware integrators who require precise specifications to ensure reliable system performance in their custom electronic designs.
Page 1 Text Content
PNP small signal transistor BC857B
Features Dimensions (Unit : mm) 1) Ideal for switching and AF amplifier applications.
BC857B
2) High current gain.
Packaging specifications
Package Taping
Type Code T116
Basic ordering unit (pieces) 1.9
BC857B (1)Emitter (2)Base Each lead has same dimensions (3)Collector
Abbreviated symbol : G3F
Absolute maximum ratings (Ta=25C)
Parameter Symbol Limits Unit
Collector-base voltage VCBO −50 Collector-emitter voltage VCEO −45
Emitter-base voltage VEBO −5 Collector current −0.1IC
Collector power dissipation PC
Junction temperature Tj °C Storage temperature Tstg −65 to 150 °C
∗ Mounted on a 7×5×0.6 mm CERAMIC SUBSTRATE
Electrical characteristics (Ta=25C)
0. 2M in
Parameter Symbol Min. Typ. Max. Unit Conditions
Collector-emitter breakdown voltage BVCEO −45 IC= −1m A
Collector-base breakdown voltage BVCBO −50 IC= −50μA
Emitter-base breakdown voltage BVEBO −5 IE= −50μA
Collector-base cutoff current ICBO −0.015 μA VCB= −30V
VCE(sat1) −0.3 IC/IB= −10m A/ −0.5m A
Collector-emitter saturation voltage
VCE(sat2) −0.65 IC/IB= −100m A/ −5m AV
Base-emitter voltage VBE(on) −0.6 −0.75 VCE= −5V, IC= −10m A
DC current transfer ratio h FE VCE= 5V, IC= −2m A
Transition frequency f T MHz VCE= −5V, IE= 20m A, f=100MHz
Collector outpu capacitance Cob 4.5 VCB= −10V, f=1MHzp F
Collector-base cutoff current ICBO −4 μA VCB= −30V
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1/2 2011.11 - Rev.B
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Page Summary Contents For ROHM BC857B Data Sheet
Manual Details
| Brand | ROHM |
|---|---|
| Pages | 3 |
| File Size | 988.67 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What is the BC857B ideal for?
It is ideal for switching and AF amplifier applications due to its high current gain.
What are the absolute maximum voltage ratings?
The collector-base voltage (VCBO) limit is -50 V, and the emitter-base voltage (VEBO) limit is -5 V.
How does the transistor perform at room temperature (25°C)?
At 25°C, the DC current transfer ratio (hFE) typically ranges from 210 to 480 when the collector is set to a -2mA current and emitter to 20mA.
What are the transistor's capacitance ratings?
The typical collector output capacitance (Cob) is 4.5 pF, and the minimum base-emitter internal capacitance (Cib) is not explicitly listed but appears in the 'Min' column as a parameter.