2SB951-Q Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -8 A
• Collector Dissipation: 45 W
• DC Current Gain (h_fe): 2000 to 5000
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.The 2SB951-Q transistor can have a current gain of 2000 to 5000. The gain of the 2SB951 will be in the range from 2000 to 10000, for the 2SB951-P it will be in the range from 4000 to 10000.Sometimes the "2S" prefix is not marked on the package - the 2SB951-Q might only be marked "B951-Q".The complementary NPN transistor to the 2SB951-Q is the 2SD1277-Q.You can replace the 2SB951-Q with the 2N6040, 2N6040G, 2N6041, 2N6041G, 2N6042, 2N6042G, 2N6667, 2N6667G, 2N6668, 2N6668G, 2SB1225, 2SB1228, 2SB882, 2SB886, 2SB951A, 2SB951A-Q, BD204, BD304, BD536, BD538, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD646, BD648, BD650, BD652, BD798, BD800, BD802, BD808, BD810, BD898, BD898A, BD900, BD900A, BD902, BDT62, BDT62A, BDT62B, BDT62C, BDT64, BDT64A, BDT64B, BDT64C, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDW45, BDW46, BDW46G, BDW47, BDW47G, BDW48, BDW74A, BDW74B, BDW74C, BDW74D, BDX34A, BDX34B, BDX34BG, BDX34C, BDX34CG, BDX34D, BDX54A, BDX54B, BDX54BG, BDX54C, BDX54CG, BDX54D, BDX78, D45H11, D45H11FP, D45H8, MJE15029, MJE15029G, TIP105, TIP105G, TIP106, TIP106G, TIP107, TIP107G, TIP135, TIP135G, TIP136, TIP136G, TIP137, TIP137G, TIP145T, TIP146T or TIP147T.