2SA1803R Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -80 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -6 A
• Collector Dissipation: 55 W
• DC Current Gain (h_fe): 55 to 110
• 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 2SA1803R transistor can have a current gain of 55 to 110. The gain of the 2SA1803 will be in the range from 55 to 160, for the 2SA1803O it will be in the range from 80 to 160.Sometimes the "2S" prefix is not marked on the package - the 2SA1803R might only be marked "A1803R".The complementary NPN transistor to the 2SA1803R is the 2SC4688R.The BDP952 (SOT-223) is the SMD version of the 2SA1803R transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SA1803R with the 2SA1093, 2SA1093-R, 2SA1102, 2SA1103, 2SA1104, 2SA1105, 2SA1106, 2SA1146, 2SA1146-R, 2SA1186, 2SA1263, 2SA1263-O, 2SA1263-R, 2SA1264, 2SA1264-O, 2SA1264-R, 2SA1264N, 2SA1264N-O, 2SA1264N-R, 2SA1265, 2SA1265-O, 2SA1265-R, 2SA1301, 2SA1301R, 2SA1303, 2SA1386, 2SA1489, 2SA1490, 2SA1491, 2SA1693, 2SA1694, 2SA1695, 2SA1804, 2SA1804-R, 2SA1805, 2SA1805-R, 2SA1939, 2SA1940, 2SA1941, 2SA1942, 2SA1942R, 2SB1230, 2SB1231, 2SB1232, 2SB686, 2SB686-R, 2SB688, 2SB688R, 2SB695, 2SB778, 2SB778-R, 2SB863, 2SB863-R, BD246B, BD246C, BD250B, BD250C, BD746B, BD746C, BDV94, BDV96, FJA4210, KTB688, KTB688-R, KTB688B, KTB688B-R, KTB778, KTB778-R or TIP36CA.