BD166 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -45 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1.5 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 40
• Transition Frequency, min: 6 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The complementary NPN transistor to the BD166 is the BD165.The BCP51 (SOT-223), BCP51-10 (SOT-223), BCP51-16 (SOT-223), BCX51 (SOT-89), BCX51-10 (SOT-89) and BCX51-16 (SOT-89) is the SMD version of the BD166 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD166 with the 2N6035, 2N6035G, 2N6036, 2N6036G, 2SA1096, 2SA1096-Q, 2SA1096-R, 2SA1096A, 2SA1096A-Q, 2SA1096A-R, 2SA1214, 2SB1067, 2SB1142, 2SB1142-R, 2SB1142-S, 2SB1142-T, 2SB1143, 2SB1143-R, 2SB1143-S, 2SB1143-T, 2SB1143-U, 2SB1165, 2SB1165-Q, 2SB1165-R, 2SB1165-S, 2SB1165-T, 2SB1166, 2SB1166-Q, 2SB1166-R, 2SB1166-S, 2SB1166-T, 2SB744, 2SB744-O, 2SB744-R, 2SB744-Y, 2SB744A, 2SB744A-O, 2SB744A-R, 2SB744A-Y, 2SB794, 2SB794-K, 2SB794-L, 2SB794-M, 2SB795, 2SB795-K, 2SB795-L, 2SB795-M, 2SB986, 2SB986-R, 2SB986-S, 2SB986-T, 2SB986-U, BD136, BD136-10, BD136-16, BD136-6, BD136G, BD138, BD138-10, BD138-16, BD138-6, BD138G, BD140, BD140-10, BD140-16, BD140-6, BD140G, BD168, BD170, BD176, BD176-10, BD176-16, BD176-6, BD178, BD178-10, BD178-6, BD180, BD180-10, BD180-6, BD180G, BD188, BD190, BD227, BD229, BD231, BD234, BD234G, BD236, BD236G, BD238, BD238G, BD376, BD376-10, BD376-16, BD376-25, BD376-6, BD378, BD378-10, BD378-16, BD378-25, BD378-6, BD380, BD380-10, BD380-16, BD380-25, BD380-6, BD440, BD440G, BD442, BD442G, BD676, BD676A, BD676AG, BD676G, BD678, BD678A, BD678AG, BD678G, BD680, BD680A, BD680AG, BD680G, BD776, BD778, BD780, BD786, BD788, BD788G, BD790, KSB744, KSB744-O, KSB744-R, KSB744-Y, KSB744A, KSB744A-O, KSB744A-R, KSB744A-Y, KSB794, KSB794-O, KSB794-R, KSB794-Y, KSB795, KSB795-O, KSB795-R, KSB795-Y, KSE171, KSE172, KSE700, KSE701, KSE702, KSE703, KTA1715, KTA1715-O, KTA1715-Y, MJE171, MJE171G, MJE172, MJE172G, MJE233, MJE234, MJE250, MJE251, MJE700, MJE700G, MJE701, MJE701G, MJE702, MJE702G, MJE703, MJE703G, MJE711 or MJE712.