onsemi

LM317LBD

LM317LBD Description

The LM317LBD from onsemi is an adjustable positive linear voltage regulator designed for low-power applications. Housed in an 8-SOIC surface-mount package, it delivers a 100mA output current with an input voltage range up to 40V and an adjustable output voltage from 1.2V to 37V. This regulator is ideal for precision voltage regulation in compact designs, offering low quiescent current (10mA) and high PSRR (80dB at 120Hz) for stable performance in noisy environments. Although marked as obsolete, it remains a reliable choice for legacy systems due to its robust protection features, including over-current, over-temperature, and short-circuit safeguards.

LM317LBD Features

• Adjustable Output: Wide 1.2V–37V range for flexible design integration.
• High PSRR (80dB): Superior noise rejection for sensitive analog/digital circuits.
• Low Quiescent Current (10mA): Enhances efficiency in battery-powered applications.
• Protection Mechanisms: Built-in over-current, over-temperature, and short-circuit protection for reliability.
• Surface-Mount Package (8-SOIC): Compact footprint suitable for space-constrained PCBs.
• REACH Unaffected: Compliant with environmental regulations.

LM317LBD Applications

• Portable Electronics: Ideal for low-power devices like sensors, wearables, and IoT modules due to its efficiency and small form factor.
• Precision Voltage References: Used in test equipment, ADCs, and DACs requiring stable, adjustable voltages.
• Embedded Systems: Suitable for microcontroller power supplies where noise immunity is critical.
• Legacy Industrial Systems: Maintains functionality in older designs needing robust, low-current regulation.

Conclusion of LM317LBD

The LM317LBD is a versatile, albeit obsolete, linear regulator offering precision, efficiency, and protection in a compact package. Its adjustable output, high PSRR, and low Iq make it well-suited for low-power, noise-sensitive applications, while its protection features ensure long-term reliability. While newer alternatives exist, the LM317LBD remains a practical choice for legacy designs or niche low-current requirements. Engineers should evaluate replacement options for future-proofing but can rely on this regulator for proven performance in existing systems.