BD681 NPN Silicon Transistor
The BD681 is a high-gain NPN silicon Darlington transistor in a TO-220-style (SOT-32) package. It’s manufactured using planar base island technology and features a monolithic Darlington configuration with an integrated antiparallel collector-emitter diode. This design delivers excellent linearity and high frequency response, making it ideal for both switching and linear applications in industrial equipment.
Features
- Monolithic Darlington configuration with built-in antiparallel diode
- High DC current gain (hFE min. 750 at IC=1.5 A, VCE=3 V)
- Good hFE linearity over operating range
- High transition frequency (fT)
- Planar base island technology for improved reliability
- Through-hole SOT-32 (TO-220) package for easy mounting and heat sinking
Specifications
| Parameter | Value |
|---|---|
| Absolute Maximum Ratings | |
| Collector-Emitter Voltage (V_CEO) | 100 V |
| Collector-Base Voltage (V_CBO) | 100 V |
| Emitter-Base Voltage (V_EBO) | 5 V |
| Collector Current (I_C) | 4 A |
| Base Current (I_B) | 100 mA |
| Total Power Dissipation (P_tot) | 40 W (at T_C=25°C) |
| Junction Temperature (T_J) | 150 °C |
| Storage Temperature (T_stg) | -65 °C to 150 °C |
| Electrical Characteristics (at T_CASE=25°C unless specified) | |
| Collector Cut-off Current (I_CEO) | max 0.5 mA at V_CE=100 V, I_B=0 |
| Collector Cut-off Current (I_CBO) | max 0.2 mA at V_CB=100 V, I_E=0 |
| Emitter Cut-off Current (I_EBO) | max 2 mA at V_EB=5 V, I_C=0 |
| Collector-Emitter Sustaining Voltage (V_CEO(sus)) | min 100 V at I_C=50 mA, I_B=0 |
| DC Current Gain (h_FE) | min 750 at I_C=1.5 A, V_CE=3 V |
| Collector-Emitter Saturation Voltage (V_CE(sat)) | max 2.5 V at I_C=1.5 A, I_B=30 mA |
| Base-Emitter On Voltage (V_BE(on)) | max 2.5 V at I_C=1.5 A, V_CE=3 V |
| Package | |
| Type | TO-126 |
| Pin Configuration | 1. Base, 2. Collector, 3. Emitter |
| Integrated Antiparallel Diode | Yes |
Applications
- Audio Power Amplifiers
- Linear Voltage Regulators
- Switching Power Supplies
- Motor Control Circuits
- Relay and Solenoid Drivers
- General-Purpose Switching and Amplification
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