onsemi

BDW42G

BDW42G Description

The BDW42G from onsemi is a high-power NPN Darlington transistor designed for demanding switching and amplification applications. With a collector-emitter breakdown voltage (Vce) of 100V and a maximum collector current (Ic) of 15A, this device is engineered for robust performance in high-current circuits. Its 4MHz transition frequency ensures efficient switching, while the Darlington configuration provides exceptionally high DC current gain (hFE ≥ 1000 @ 5A, 4V), minimizing drive requirements. Packaged in a TO-220 through-hole format, the BDW42G is suitable for heat-sinked designs, supporting a maximum power dissipation of 85W.

BDW42G Features

• High Current Handling: Supports up to 15A continuous collector current, ideal for power regulation and motor control.
• Low Drive Requirements: Darlington pair delivers ultra-high gain (1000+ @ 5A), reducing base current needs.
• Fast Switching: 4MHz transition frequency enables efficient high-frequency operation.
• Thermally Robust: TO-220 package with 85W power dissipation ensures reliability in high-temperature environments.
• Compliance: ROHS3 compliant, REACH unaffected, and EAR99 classified for global regulatory adherence.
• Low Leakage: Collector cutoff current ≤ 2mA enhances efficiency in standby modes.

BDW42G Applications

The BDW42G excels in high-power, high-gain applications, including:

• Power Supplies: Linear regulators and switch-mode power supplies (SMPS) requiring high current gain.
• Motor Drivers: H-bridge and solenoid drivers in industrial/automotive systems.
• Audio Amplifiers: High-fidelity Class AB/B output stages.
• Relay/Actuator Control: Low-drive, high-current switching for automation systems.
• Lighting Systems: LED drivers and ballast controls.

Conclusion of BDW42G

The BDW42G stands out as a high-performance Darlington transistor for power electronics, combining high current capacity, exceptional gain, and thermal resilience. While marked obsolete, its TO-220 package, compliance certifications, and low drive requirements make it a reliable choice for legacy designs or replacements in industrial, automotive, and audio applications. Engineers seeking a cost-effective, high-gain NPN solution for power switching will find the BDW42G a compelling option.