onsemi

LM337BT

LM337BT Description

The LM337BT from onsemi is a negative adjustable linear voltage regulator designed to deliver a stable, precisely controlled output voltage. With an output current capability of 1.5A, it is well-suited for power supply applications requiring reliable negative voltage regulation. The device operates with a quiescent current of 6 mA and offers a high PSRR of 77dB at 120Hz, ensuring minimal noise interference in sensitive circuits. Packaged in a TO-220 through-hole format, the LM337BT is optimized for ease of integration into industrial and consumer electronics. Although marked as obsolete, it remains a robust choice for legacy designs due to its proven performance and over-current/over-temperature protection.

LM337BT Features

• Adjustable Output: Allows precise voltage setting via external resistors.
• High Current Capacity: Supports up to 1.5A continuous output current.
• Excellent Ripple Rejection: 77dB PSRR at 120Hz minimizes noise in power rails.
• Built-in Protections: Includes over-current and over-temperature safeguards for enhanced reliability.
• Low Quiescent Current: 6 mA typical, improving efficiency in standby modes.
• Wide Compatibility: Compliant with EAR99 and REACH Unaffected regulations.

LM337BT Applications

The LM337BT is ideal for:

• Negative Voltage Supplies: Used in audio amplifiers, op-amp circuits, and instrumentation requiring dual rails (±V).
• Industrial Control Systems: Provides stable power for analog sensors, actuators, and control modules.
• Test & Measurement Equipment: Ensures clean, regulated negative voltages for precision instruments.
• Legacy Electronics Repair: A go-to solution for maintaining or upgrading older systems due to its reliability.

Conclusion of LM337BT

The LM337BT stands out as a dependable negative voltage regulator with high current handling, superior noise suppression, and robust protection features. While newer alternatives exist, its proven performance in demanding applications makes it a preferred choice for engineers working with legacy designs or cost-sensitive projects. Its TO-220 package ensures easy thermal management, further solidifying its role in power supply architectures.