This post explains for the semiconductor B857.
The Part Number is 2SB857.
The Package is TO-220AB Type
The function of this semiconductor is PNP Transistor.
Preview images :
This is Silicon PNP Triple Diffused Transistor.
Application Low frequency power amplifier complementary pair with 2SD1133 and 2SD1134 Outline TO-220AB 1 2 3 1. Base 2. Collector (Flange) 3. Emitter Absolute Maximum Ratings (Ta = 25°C) Ratings Item Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Collector peak current Collector power dissipation Junction temperature Storage temperature Note: 1. Value at T C = 25°C Symbol VCBO VCEO VEBO IC I C(peak) PC – Tj Tstg 1 2SB857 –70 –50 –5 –4 –8 40 150 –45 to +150 2SB858 –70 –60 –5 –4 –8 40 150 –45 to +150 Unit V V V A A W °C °C 2SB857, 2SB858 Electrical Characteristics (Ta = 25°C) 2SB857 Item Collector to base breakdown voltage Collector to emitter breakdown voltage Emitter to base breakdown voltage Collector cutoff current Symbol V(BR)CBO V(BR)CEO V(BR)EBO I CBO 1 2SB858[…]
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = – 70 V
2. Collector to Emitter Voltage: Vceo = – 50 V
3. Emitter to Base Voltage: Vebo = – 5 V
4. Collector Current: Ic = – 4 A
5. Collector Dissipation : Pc = 40 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -45 ~ +150°C