2SA1805-O Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -120 V
• Collector-Base Voltage, max: -120 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -8 A
• Collector Dissipation: 70 W
• DC Current Gain (h_fe): 80 to 160
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The 2SA1805-O transistor can have a current gain of 80 to 160. The gain of the 2SA1805 will be in the range from 55 to 160, for the 2SA1805-R it will be in the range from 55 to 110.Sometimes the "2S" prefix is not marked on the package - the 2SA1805-O might only be marked "A1805-O".The complementary NPN transistor to the 2SA1805-O is the 2SC4690-O.You can replace the 2SA1805-O with the 2SA1093, 2SA1093-O, 2SA1104, 2SA1105, 2SA1106, 2SA1146, 2SA1146-O, 2SA1186, 2SA1264, 2SA1264-O, 2SA1264N, 2SA1264N-O, 2SA1265, 2SA1265-O, 2SA1301, 2SA1301O, 2SA1302, 2SA1302O, 2SA1303, 2SA1386, 2SA1386A, 2SA1386A-O, 2SA1386A-P, 2SA1386A-Y, 2SA1490, 2SA1491, 2SA1492, 2SA1516, 2SA1633, 2SA1694, 2SA1695, 2SA1788, 2SA1804, 2SA1804-O, 2SA1940, 2SA1940O, 2SA1941, 2SA1941O, 2SA1942, 2SA1942O, 2SA1943, 2SA1943N, 2SA1943O, 2SA1986, 2SA1986-O, 2SA2062, 2SA2063, 2SA2120, 2SA2120-O, 2SA2121, 2SA2121-O, 2SA2151, 2SA2151A, 2SA2151A-O, 2SA2151A-P, 2SA2151A-Y, 2SB1162, 2SB1162-S, 2SB1163, 2SB1163-S, 2SB1361, 2SB1361-S, 2SB1362, 2SB1429, 2SB1429-O, 2SB688, 2SB688O, 2SB778, 2SB778-O, 2SB816, 2SB817, 2SB863, 2SB863-O, 2SB966, FJA4210, KTA1943, KTA1943A, KTA1943AO, KTA1943O, KTA1962, KTA1962A, KTA1962AO, KTA1962O, KTB688, KTB688-O, KTB688B, KTB688B-O, KTB778, KTB778-O, KTB817, KTB817B, MJW1302A, MJW1302AG, NTE2329, TTA0001, TTA0002 or TTA1943.