Overview
The BD678A is a PNP power Darlington transistor manufactured by STMicroelectronics. It is part of the BD6xxx series, known for its monolithic Darlington configuration and integrated antiparallel collector-emitter diode. This transistor is designed for medium power linear and switching applications, offering good hFE linearity and high fT frequency. The BD678A is packaged in a SOT-32 tube, making it suitable for various industrial and electronic systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Collector-Base Voltage (VCBO) | 60 | V |
| Collector-Emitter Voltage (VCEO) | 60 | V |
| Emitter-Base Voltage (VEBO) | 5 | V |
| Maximum DC Collector Current | 4 | A |
| Collector Cut-off Current (ICEO) | 0.2 - 2 | mA |
| Collector-Emitter Saturation Voltage (VCE(sat)) | 2.8 | V |
| Base-Emitter Voltage (VBE) | 2.5 | V |
| DC Current Gain (hFE) | 750 | |
| Total Dissipation at Tcase = 25°C (PTOT) | 40 | W |
| Maximum Operating Junction Temperature (TJ) | 150 | °C |
| Storage Temperature (Tstg) | -65 to 150 | °C |
Key Features
- Monolithic Darlington configuration with integrated antiparallel collector-emitter diode.
- Good hFE linearity and high fT frequency.
- High collector current capability up to 4 A.
- Low collector-emitter saturation voltage (VCE(sat)) of 2.8 V.
- High DC current gain (hFE) of 750.
- ECOPACK® packages with lead-free second level interconnect.
Applications
The BD678A is intended for use in medium power linear and switching applications, including:
- Industrial equipment.
- Linear and switching power supplies.
- Motor control systems.
- Relay and solenoid drivers.
Q & A
- What is the collector-emitter voltage (VCEO) of the BD678A? The collector-emitter voltage (VCEO) of the BD678A is 60 V.
- What is the maximum DC collector current of the BD678A? The maximum DC collector current of the BD678A is 4 A.
- What is the collector-emitter saturation voltage (VCE(sat)) of the BD678A? The collector-emitter saturation voltage (VCE(sat)) of the BD678A is 2.8 V.
- What is the DC current gain (hFE) of the BD678A? The DC current gain (hFE) of the BD678A is 750.
- What is the maximum operating junction temperature (TJ) of the BD678A? The maximum operating junction temperature (TJ) of the BD678A is 150 °C.
- What type of package does the BD678A come in? The BD678A comes in a SOT-32 tube package.
- Is the BD678A still in production? No, the BD678A is obsolete and no longer manufactured.
- What are the typical applications of the BD678A? The BD678A is used in medium power linear and switching applications, including industrial equipment and motor control systems.
- Does the BD678A have any integrated protection features? Yes, it has an integrated antiparallel collector-emitter diode.
- What is the total dissipation at Tcase = 25°C (PTOT) for the BD678A? The total dissipation at Tcase = 25°C (PTOT) for the BD678A is 40 W.
