2SD1621-S Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 25 V
• Collector-Base Voltage, max: 30 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 2 A
• Collector Dissipation: 0.5 W
• DC Current Gain (h_fe): 140 to 280
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-89

Here is an image showing the pin diagram of this transistor.The 2SD1621-S transistor can have a current gain of 140 to 280. The gain of the 2SD1621 will be in the range from 100 to 560, for the 2SD1621-R it will be in the range from 100 to 200, for the 2SD1621-T it will be in the range from 200 to 400, for the 2SD1621-U it will be in the range from 280 to 560.The 2SD1621-S transistor is marked as "DDS".The complementary PNP transistor to the 2SD1621-S is the 2SB1121-S.You can replace the 2SD1621-S with the 2SD1623, 2SD1623-S, 2SD1624 or 2SD1624-S.