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LM317M Voltage Regulator: Specifications, Alternatives, and Application Circuits

The LM317M is a simple, three-terminal voltage regulator that requires just two external resistors to set the output voltage, making it a favorite for both personal and commercial projects due to its simplicity and efficiency. Its straightforward design belies its sophisticated performance, enabling it to be used in a wide range of applications, from small DIY projects to large-scale commercial systems. This article explores the LM317M's capabilities, design intricacies, and practical applications in detail, providing a comprehensive guide for anyone looking to understand or utilize this versatile component.

Catalog

1. What is the LM317M Voltage Regulator?

2. LM317M Pin Configuration

3. LM317M Symbol, Footprint, and CAD Model

4. Features of the LM317M

5. LM317M Technical Specifications

6. Functional Block Diagram of the LM317M

7. Marking Diagrams of the LM317M

8. Test Circuits of the LM317M

9. Alternatives of the LM317M

10. Applications of the LM317M

11. Package for the LM317M

12. LM317M Manufacturer Information

What is the LM317M Voltage Regulator?

The LM317M voltage regulator offers a robust current handling of over 500 mA, making it a distinguished choice for a myriad of applications. Its adjustable output from 1.2 V to 37 V allows it to meet various power needs with effortless operation. This feature integrates seamlessly into both simple and sophisticated designs that necessitate consistent voltage control. The inherent range and flexibility speak to the innate desire for reliability and precision in power management solutions.

The LM317M finds great use in providing localized voltage regulation. By delivering a steady power output, it ensures the smooth operation of electronic parts. It's frequently selected for power solutions in high-sensitivity instruments, where stable performance is desired amid fluctuating inputs. The constancy it offers is akin to an unwavering promise of support in dynamic conditions.

By modifying external resistors, the LM317M can evolve from a voltage to a current regulator, enriching its utility in electronic endeavors. This transformation proves advantageous in LED setups and battery charging tasks, where current management is pursued. While not originally crafted for switching duties, the LM317M can be reimagined for these tasks, offering a budget-friendly alternative when customary regulators might not be the solution. This notion of adaptability reflects the inventive spirit, where challenges inspire the creation of solutions that harmonize cost and technical sturdiness.

LM317M Pin Configuration

LM317M Pinout

LM317M Symbol, Footprint, and CAD Model

LM317M Symbol

LM317M Footprint

LM317M CAD Model

Features of the LM317M

• Adjustable Output: Regulates voltage precisely for different needs.

• High Current: Delivers reliable power for demanding tasks.

• Thermal Protection: Prevents overheating, boosting reliability.

• Short-Circuit Protection: Guards against damage, improving safety.

• Handles High Voltage: Suitable for high-voltage applications, including automotive.

• Automotive-Grade (AEC-Q100): Certified for harsh environments.

• Versatile: Reduces need for multiple regulators.

• Cost & Space Efficient: Saves money and space in designs.

• Flexible Design: Supports diverse electronic projects easily.

LM317M Technical Specifications

Technical characteristics, features, and parameters of the LM317M, along with components that have comparable specifications to the ON Semiconductor LM317MTG.

Type	Parameter
Factory Lead Time	8 Weeks
Package / Case	TO-220-3
Mount	Through Hole
Weight	4.535924g
Packaging	Tube
JESD-609 Code	e3
Part Status	Active
Number of Terminations	3
Terminal Finish	Tin (Sn)
Terminal Position	SINGLE
Number of Functions	1
Time@Peak Reflow Temperature-Max (s)	40
Pin Count	3
Voltage - Input (Max)	40V
Output Type	Adjustable
Operating Supply Voltage	40V
Lifecycle Status	ACTIVE (Last Updated: 2 days ago)
Mounting Type	Through Hole
Number of Pins	3
Published	2006
Operating Temperature	0°C~125°C TJ
Pbfree Code	yes
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN Code	EAR99
Packing Method	RAIL
Peak Reflow Temperature (Cel)	260
Terminal Pitch	2.54mm
Base Part Number	LM317M
Number of Outputs	1
Output Voltage	37V
Max Output Current	500mA
Output Configuration	Positive
Accuracy	4%
Number of Regulators	1
Protection Features	Over Current, Over Temperature
Halogen Free	Halogen Free
Reference Voltage	1.3V
Dropout Voltage1-Nom	3V
Power Supply Rejection Ratio (PSRR)	80dB
Width	4.826mm
Height	15.748mm
Radiation Hardening	No
Lead Free	Lead Free
Max Output Voltage	37V
Min Input Voltage	4.2V
Current - Quiescent (Iq)	10mA
PSRR	80dB ~ 65dB (120Hz)
Dropout Voltage	2.1V
Min Output Voltage	1.2V
Output Voltage Accuracy	4%
Length	10.2616mm
RoHS Status	ROHS3 Compliant
REACH SVHC	No SVHC

Functional Block Diagram of the LM317M

LM317M Functional Block Diagram

Marking Diagrams of the LM317M

LM317M Marking Diagram

Test Circuits of the LM317M

Basic Circuit Configuration

Line Regulation and Line Test Circuit

Load Regulation and Load Test Circuit

Standard Test Circuit

Ripple Rejection Test Circuit

Alternatives of the LM317M

Model Number	Manufacturer	Description
7703401TA	TT Electronics Resistors	Adjustable Positive Standard Regulator, 1.2V Min, 1.3V Max, TO-257, 3 PIN
LM117H/883C	Texas Instruments	1.2 V-37V ADJUSTABLE POSITIVE REGULATOR, MBCY3, METAL CAN, TO-39, 3 PIN
7703401UA	International Rectifier	Adjustable Positive Standard Regulator, 1.5V Min, 5.5V Max, BIPolar
LM317HVG	TT Electronics Power and Hybrid / Semelab Limited	ADJUSTABLE POSITIVE REGULATOR, MSFM3, METAL, TO-257, 3 PIN
LM317KMDC	National Semiconductor Corporation	IC VREG 1.2 V-37 V ADJUSTABLE POSITIVE REGULATOR, UUC, DIE, Adjustable Positive Single Output Standard Regulator
LM317H	Texas Instruments	1.5-A, 40-V, adjustable linear voltage regulator 3-TO 0 to 0
LM117MHVHR1	TT Electronics Resistors	Adjustable Positive Standard Regulator, MBCY3, TO-39, 3 PIN
LM117H-BSS2	TT Electronics Resistors	Adjustable Positive Standard Regulator, MBCY3, TO-39, 3 PIN
LM317HVK	Linear Technology	IC VREG 1.2 V-57 V ADJUSTABLE POSITIVE REGULATOR, MBFM2, METAL CAN, TO-3, 2 PIN, Adjustable Positive Single Output Standard Regulator
SG117IG/883B	Linfinity Microelectronics	Adjustable Positive Standard Regulator, 1.2V Min, 37V Max, BIPolar, PSFM3, TO-257, 3 PIN
LM317MTG	ON Semiconductor	ADJUSTABLE POSITIVE REGULATOR, TO-220-3, 500 mA, 4.2V Min Input, 37V Max Output, 2.1V Dropout
LM317BTG	ON Semiconductor	ADJUSTABLE POSITIVE REGULATOR, TO-220-3, 500 mA, 4.2V Min Input, 37V Max Output, 2.1V Dropout
LM317T-DG	STMicroelectronics	ADJUSTABLE POSITIVE REGULATOR, TO-220-3, 400 mA, 4.2V Min Input, 37V Max Output, 1.95V Dropout
LM317TG	ON Semiconductor	ADJUSTABLE POSITIVE REGULATOR, TO-220-3, 400 mA, 4.2V Min Input, 37V Max Output, 2.25V Dropout
LM317MBTG	ON Semiconductor	ADJUSTABLE POSITIVE REGULATOR, TO-220-3, 400 mA, 4.2V Min Input, 37V Max Output

Applications of the LM317M

The LM317M supports precision, protection, and efficiency in electronics.

• Adjustable Current Limiting: Lets you set safe current limits using resistors and diodes. Maintains stability when resistance changes with temperature.

• Electronic Shutdown: Protects circuits from overcurrent and overheating. Increases reliability and extends the lifespan of devices.

• Current Regulation: Ensures consistent power delivery to prevent disruptions. Improves energy efficiency in power-sensitive systems.

• Testing and Troubleshooting: Allows fine-tuning through repeated testing for optimal performance. Requires expertise to refine complex circuits effectively.

Package for the LM317M

LM317M Manufacturer Information

On Semiconductor emerges as an influential figure in the electronics industry, strategically dedicated to enhancing energy efficiency across its diverse range of products. This dedication not only fuels the company's inventive spirit but also places it at the cutting edge of evolving sustainable technology solutions worldwide. By persistently engaging in advanced research and development, they aim to decrease energy consumption while boosting the performance of electronic devices. Their product offerings impact energy optimization across various applications, including electronics and industrial systems. On Semiconductor demonstrates how leading technology firms can seamlessly merge innovation with sustainability, showcasing an astute understanding of energy efficiency's in the contemporary world.

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Frequently Asked Questions [FAQ]

1. What is the optimal current output for the LM317M?

The LM317M can provide a current output of roughly 750 mA, roughly half of what the LM317 is capable of achieving. When incorporating such components into a circuit design, it becomes important to reflect on the demands of your project. Matching the LM317M’s current capacity to your needs can foster a harmonious balance of reliability and functionality. In practice, adherence to these limits often produces improved performance and enhanced operational stability.

2. What happens when the LM317 is subjected to a load exceeding 1.5A?

Should the LM317 be pushed beyond a 1.5A current load, it risks overheating or a complete output breakdown, which could culminate in component failure. Incorporating proper heat sinks and ensuring sufficient ventilation in your circuit design can alleviate these thermal risks. The mindful integration of thermal management strategies is often emphasized when dealing with components sensitive to high current.

3. How do the M5237L and LM317 compare as adjustable power supplies?

The LM317 garners attention for its straightforward design, which reduces opportunities for errors in assembly. The structural aspects of these adjustable power supplies are need to their performance, yet the LM317 presents a solution that shines for its friendly reliability across diverse applications. Deciding between the M5237L and LM317 largely depends on personal preferences and the specific scenarios at hand. Feedback often praises the LM317's simplicity and robust stability, especially when projects prioritize fuss-free execution.

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