This post explains for the semiconductor B778.
The Part Number is 2SB778.
The function of this semiconductor is -120V, PNP Transistor.
Manufacturer: Wing Shing Computer
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Description
2SB778 AUDIO POWER AMPLIFIER DC TO DC CONVERTER PNP PLANAR SILICON TRANSISTOR SC-65 ! ! High Current Capability High Power Dissipation ABSOLUTE MAXIMUM RATING (TA=25℃) Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base voltage Collector Current (DC) Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Rating -120 -120 -6 -10 80 150 -55~150 Unit V V V A W ℃ ℃ ELECTRICAL CHARACTERISTICS (TA=25℃) Characteristic Collector Base Breakdown Voltage Collector Emitter Breakdown Voltage Emitter Base Breakdown Voltage Collector Cutoff Current Emitter Cutoff Current *DC Current Gain DC Current Gain Collector- Emitter Saturation Voltage Symbol BVCBO BVCEO BVEBO ICBO IEBO hFE1 hFE2 VCE(sat) Test Condition IC=-5 mA IE=0 IC=-10 mA RBE=∞ IE=-5mA IC=0 VCB=-60V IE=0 VEB=-4V IC=0 VCE=-5V IC=-1A VCE=-5V IC=-2A IC=-3A IB=-0.3A Min -120 -120 -6 Typ Max Unit V V V mA mA 55 120 -0.1 -0.1 160 -1.5 V […]
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = – 120 V
2. Collector to Emitter Voltage: Vceo = – 120 V
3. Emitter to Base Voltage: Vebo = – 6 V
4. Collector Current: Ic = – 10 A
5. Collector Dissipation : Pc = 80 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C