2SB561-B Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -20 V
• Collector-Base Voltage, max: -25 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.7 A
• Collector Dissipation: 0.5 W
• DC Current Gain (h_fe): 85 to 170
• Transition Frequency, min: 350 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SB561-B is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The 2SB561-B transistor can have a current gain of 85 to 170. The gain of the 2SB561 will be in the range from 85 to 240, for the 2SB561-C it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SB561-B might only be marked "B561-B".The complementary NPN transistor to the 2SB561-B is the 2SD467-B.You can replace the 2SB561-B with the 2N4951, 2N4954, 2SA1534, 2SA1534-Q, 2SA683, 2SA683-Q, 2SB562, 2SB562-B, 2SB598, 2SB621, 2SB621-Q, 2SB621A, 2SB621A-Q, 2SB698, KSB564AC, KSB810, KSB811 or KTA1283.