The 2SD718 or D718 is a high power BJT Transistor used in audio amplifier output stages, power supplies and general high current switching circuits. This transistor is a popular choice for 45-50W audio amplifier designs. This article describes the Pinout, Features, Specifications and Equivalent transistor for replacement.
2SD718 Transistor Pinout
To know the Pinout of the transistor, just hold the transistor metal side or Heatsink side at the backside and front facing you. Then the pins are need to point downward and count the pin numbers from left to right and pinout configuration is given below,
| Pin Number | Pin Name |
|---|---|
| 1 | Base |
| 2 | Collector |
| 3 | Emitter |
Features and Specifications
- Transistor Type: NPN
- Collector-Emitter Voltage (VCEO): 120 V
- Collector-Base Voltage (VCBO): 120 V
- Emitter-Base Voltage (VEBO): 5 V
- Collector Current (IC): 8A
- Collector Power Dissipation (Pc): 80 W
- DC Current Gain (hFE): 40 – 320
Complementary PNP Pair
2SB688 NPN transistor is the official complementary transistor for 2SD718.
Equivalent Transistor for Replacement
- 2SC3855
- 2SC3281
- TIP41C (lighter duty, only for lower power)
- 2N6488
- MJE15030
Applications
- Used in High power audio frequency power amplifiers circuits.
- 45-50W output amplifier stages as power output transistors.
- Switching regulators.
- Power control circuits.
- General high current switching applications.
