The KSA1220 transistor is a PNP from ON Semiconductors. It is a PNP power amplifier transistor, which is commonly used for high-frequency amplification and audio frequency (AF) amplification. It is commonly used in Class B amplifier circuits or projects. The Class B amplifiers require both an NPN and a PNP transistor to amplify the positive and negative portions of an audio wave. In these circuits the KSA1220A is used as a PNP transistor, and the KSC2690A NPN transistor is used.
KSA1220 transistor Pinout
Pins detail with discretion are given below in the table
| Pin Number | Pin Name |
Pin Description |
| 1 | Emitter | Current Drains out through emitter |
| 2 | Collector | Current flows in through the collector. |
| 3 | Base | Controls the biasing of transistor |
Characteristics of KSA1220
- Package: TO-126
- Type of transistor: PNP
- Max Collector-Emitter Voltage: -120 V
- Max Collector-Base Voltage: -120 V
- Max Emitter-Base Voltage: -5 V
- Collector Dissipation: 20 W
- Collector Current: -1.2 A
- DC Current Gain maximum (hfe): 60 to 320
- Max Transition Frequency: 175 MHz
- Operating and Storage Range: -55 to +150 °C
Complementary NPN transistor
The complementary NPN transistor to the KSA1220 transistor is the KSC2690; however, you can use any other related transistor.
Equivalent Of Transistor KSA1220
The equivalent of the KSA1220 transistor is the 2SA1021, 2SA1220, 2SA1220A, KSA1220A, or 2SB649.
SMD Version of KSA1220 Transistor
The SMD versions of the KSA1220-Y transistor are 2SB806 (SOT-89) and 2SD1007 (SOT-89).
Application of KSA1220A Transistor
- Mostly used in Audio Amplifiers
- Portable speakers
- Class B amplifiers designs
2D-Model (TO-126)
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