LM317LM Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM317LM is a linear voltage regulator IC from onsemi designed for positive adjustable output applications. It delivers 100mA output current with adjustable voltage ranging from 1.2V to 37V, suitable for power management circuits requiring precision voltage regulation. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Direct substitutes from active manufacturers provide functional equivalence while maintaining electrical and mechanical compatibility.

Substiute Parts

LM317LM

onsemiIn Stock: 2393LM317LM Datasheet

Current PartRFQ

LM317LDR2G

onsemiIn Stock: 980453LM317LDR2G Datasheet

DirectRFQ

LM317LD13TR

STMicroelectronicsIn Stock: 886604LM317LD13TR Datasheet

DirectRFQ

LM317LM/NOPB

Texas InstrumentsIn Stock: 35198LM317LM/NOPB Datasheet

DirectRFQ

LM217LD13TR

STMicroelectronicsIn Stock: 40567LM217LD13TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM317LM is determined by strict electrical and mechanical parameter matching:

Critical Parameters for Substitution:

• Output Configuration: Positive
• Output Type: Adjustable
• Voltage Range: Input (Max) 40V, Output 1.2V to 37V
• Current - Output: 100mA
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Protection Features: Over Current, Over Temperature, Short Circuit

All substitute parts listed maintain these core parameters. Variations in quiescent current (Iq), PSRR specifications, and operating temperature ranges are secondary parameters that do not affect functional substitution within the defined electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

LM317LDR2G (onsemi) and LM317LD13TR (STMicroelectronics) are direct functional equivalents to the LM317LM. Both maintain identical electrical specifications and 8-SOIC packaging. LM317LDR2G is from the same manufacturer as the original part. LM317LD13TR offers equivalent performance with active product status and ROHS3 compliance. Both parts are available in high inventory quantities.

LM317LM/NOPB (Texas Instruments) provides direct substitution with extended operating temperature range (-40°C ~ 125°C) compared to the original 0°C ~ 125°C specification. This part is suitable for applications requiring wider temperature operation. ROHS3 compliance and active product status ensure long-term availability.

Alternative Substitute (Functional Compatibility with Differences):

LM217LD13TR (STMicroelectronics) is a functional substitute based on the LM217 base product number. It maintains all critical electrical parameters including 40V maximum input, 1.2V to 37V adjustable output, and 100mA output current. The LM217LD13TR lacks specified over-current protection compared to the LM317 series, which may affect suitability depending on application requirements. Extended operating temperature range (-40°C ~ 125°C) and ROHS3 compliance are provided.

Compliance and Availability:

All active substitute parts carry ROHS3 compliance and REACH unaffected status. Inventory availability is substantial across all substitutes, with LM317LDR2G offering the highest stock level (980,400 pcs). Product status is active for all recommended substitutes, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can LM317LDR2G directly replace LM317LM in existing designs?

A: Yes. LM317LDR2G maintains identical electrical specifications, output voltage range (1.2V to 37V), 100mA output current, and 8-SOIC packaging. The primary difference is packaging format (Cut Tape & Digi-Reel versus original specification). No circuit modifications are required.

Q: What is the difference between LM317LD13TR and LM317LM/NOPB?

A: Both are direct electrical equivalents with identical voltage and current specifications. LM317LD13TR is manufactured by STMicroelectronics, while LM317LM/NOPB is from Texas Instruments. LM317LM/NOPB offers extended operating temperature range (-40°C to 125°C versus 0°C to 125°C). Selection depends on temperature requirements and supplier availability.

Q: Why is LM217LD13TR listed as an alternative rather than a direct substitute?

A: LM217LD13TR is based on the LM217 product line rather than LM317. While it maintains critical electrical parameters (voltage range, output current, package), it does not specify over-current protection, which is present in LM317 variants. Use LM217LD13TR only when over-current protection is not required by the application.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts (LM317LDR2G, LM317LD13TR, LM317LM/NOPB, LM217LD13TR) are ROHS3 compliant. The original LM317LM does not specify RoHS status due to its obsolete classification.

Q: What packaging options are available for substitutes?

A: LM317LDR2G, LM317LD13TR, and LM217LD13TR are supplied in Cut Tape (CT) & Digi-Reel format. LM317LM/NOPB is supplied in Tube packaging. All maintain the same 8-SOIC physical package (0.154", 3.90mm Width) for PCB compatibility.

Q: Can I use a substitute with a lower quiescent current specification?

A: Yes. LM317LD13TR and LM317LM/NOPB specify 5mA quiescent current compared to the original 10mA. Lower quiescent current reduces standby power consumption and is functionally compatible. No circuit changes are required.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts maintain MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.