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LM337D2T

LM337D2T Description

The LM337D2T from onsemi is a negative adjustable linear voltage regulator designed for high-performance power management applications. Packaged in a D2PAK-3 (TO-263-3) surface-mount form factor, it delivers a robust 1.5A output current with an adjustable output voltage range, making it highly versatile for diverse circuit designs. This regulator operates over a wide temperature range of 0°C to 125°C, ensuring reliability in harsh environments. With a quiescent current of 6 mA and a low dropout voltage, it optimizes power efficiency while maintaining stable output. The device is REACH unaffected and classified as obsolete, but remains a viable choice for legacy or specialized designs.

LM337D2T Features

• Adjustable Negative Output: Provides flexibility in setting the desired output voltage via external resistors.
• High Current Capacity: Supports 1.5A continuous output current, suitable for power-hungry applications.
• Excellent Ripple Rejection: 77dB PSRR at 120Hz ensures clean output by attenuating input noise.
• Robust Protection: Integrated over-current and over-temperature protection safeguards against fault conditions.
• Low Quiescent Current: 6 mA typical minimizes power waste in standby modes.
• Surface-Mount Design: D2PAK-3 package offers efficient thermal dissipation and PCB space savings.

LM337D2T Applications

• Industrial Power Supplies: Ideal for negative rail regulation in control systems and instrumentation.
• Audio Amplifiers: Provides stable negative voltage for op-amp circuits, reducing noise and distortion.
• Test & Measurement Equipment: Ensures precise voltage references in lab-grade devices.
• Legacy Systems: Suitable for maintaining or repairing older electronics requiring negative voltage regulation.
• Automotive Electronics: Operates reliably in high-temperature environments, though obsolescence limits new designs.

Conclusion of LM337D2T

The LM337D2T is a high-performance, adjustable negative voltage regulator offering 1.5A output, superior PSRR, and robust protection features. While marked obsolete, its thermal efficiency, wide operating range, and noise immunity make it a strong candidate for legacy or niche applications. Engineers seeking a reliable negative rail solution for industrial, audio, or precision systems may still find value in this regulator, despite its discontinued status. For new designs, alternative modern regulators should be evaluated, but the LM337D2T remains a proven choice for specific use cases.