LM317T-DG

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LM317T-DG is a positive adjustable linear voltage regulator manufactured by STMicroelectronics. It provides an output current exceeding 1.5 A with an adjustable output voltage range from 1.2 V to 37 V. The device operates within an input voltage range of up to 40 V and features a typical power supply rejection ratio (PSRR) of 80 dB at 120 Hz, dropping to 65 dB. It includes internal protections for overcurrent, thermal shutdown, and safe operating area control. The component is housed in a TO-220-3 through-hole package and supports operation temperatures from 0°C to 125°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Adjustable output voltage capability spanning 1.2 V to 37 V via external resistive divider
• Integrated protection mechanisms including current limiting, thermal shutdown, and safe operating area control
• High ripple rejection performance with PSRR reaching 80 dB at 120 Hz

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• General-purpose positive adjustable voltage regulation
• Local card-level regulation systems
• Programmable output power supplies

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure the correct package type and temperature rating. Confirm RoHS compliance status as per the latest product change notices. Check for any pinout variations or alternative marking codes that may indicate different manufacturing origins or revisions. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a robust, high-current adjustable regulator is required for through-hole applications. The TO-220 package facilitates effective heat dissipation for loads approaching 1.5 A. Consider the maximum input voltage limit of 40 V and the dropout voltage requirements relative to the desired output. Evaluate thermal management needs based on the expected power dissipation in the target environment.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the LM317 family of monolithic integrated circuits designed for positive adjustable voltage regulation. The LM317 series is widely recognized for its versatility and ease of use, eliminating the need for multiple fixed regulators. The 'DG' suffix typically denotes the specific tape-and-reel or tube packaging variant produced by STMicroelectronics, distinct from other package styles like D2PAK or SOT-223.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Compatible substitutes include the LM317T from Texas Instruments and the LM317TO from onsemi. Verify pin compatibility and thermal characteristics before substitution. Ensure the replacement part meets the same 1.5 A current and 40 V input voltage specifications.