BD131 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 70 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 15 W
• DC Current Gain (h_fe): 20
• Transition Frequency, min: 60 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 2SD1626 (SOT-89) is the SMD version of the BD131 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BD131 with the 2N4922, 2N4922G, 2N4923, 2N4923G, 2N5191, 2N5191G, 2N5192, 2N5192G, 2N6038, 2N6038G, 2N6039, 2N6039G, 2SC3786, 2SD1348, 2SD1348-R, 2SD1348-S, 2SD1348-T, 2SD1348-U, 2SD1683, 2SD1683-R, 2SD1683-S, 2SD1683-T, 2SD1683-U, 2SD1722, 2SD1722-Q, 2SD1722-R, 2SD1722-R, 2SD1722-S, 2SD1723, 2SD1723-Q, 2SD1723-R, 2SD1723-R, 2SD1723-S, 2SD794, 2SD794-O, 2SD794-R, 2SD794-Y, 2SD794A, 2SD794A-O, 2SD794A-R, 2SD794A-Y, BD175, BD175-10, BD175-16, BD175-6, BD177, BD177-10, BD177-6, BD179, BD179-10, BD179-6, BD179G, BD187, BD189, BD437, BD437G, BD439, BD439G, BD441, BD441G, BD675, BD675A, BD675AG, BD675G, BD677, BD677A, BD677AG, BD677G, BD679, BD679A, BD679AG, BD679G, BD775, BD777, BD779, BD785, BD787, BD787G, BD789, BDX35, BDX36, BDX37, KSD794, KSD794-O, KSD794-R, KSD794-Y, KSD794A, KSD794A-O, KSD794A-R, KSD794A-Y, KSE181, KSE182, KSE800, KSE801, KSE802, KSE803, MJE181, MJE181G, MJE182, MJE182G, MJE223, MJE224, MJE225, MJE240, MJE241, MJE242, MJE800, MJE800G, MJE801, MJE801G, MJE802, MJE802G, MJE803, MJE803G or NTE184.