LM317BTG Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317BTG is a positive adjustable linear voltage regulator manufactured by onsemi, rated for 1.5A output current in a TO-220-3 package. This IC is designed for applications requiring adjustable output voltage regulation from 1.2V to 37V with input voltages up to 40V. The device is currently in active production status with robust inventory availability (100,099 pcs in stock).

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific product status or compliance requirements necessitate alternative sourcing.

Substiute Parts

LM317BTG

onsemiIn Stock: 100204LM317BTG Datasheet

Current PartRFQ

LM317KCS

Texas InstrumentsIn Stock: 2286LM317KCS Datasheet

DirectRFQ

LM317KCSE3

Texas InstrumentsIn Stock: 18333LM317KCSE3 Datasheet

DirectRFQ

LM317T

NTE Electronics, IncIn Stock: 89059LM317T Datasheet

DirectRFQ

LM317AT/NOPB

Texas InstrumentsIn Stock: 634465LM317AT/NOPB Datasheet

SimilarRFQ

LM317KCT

Texas InstrumentsIn Stock: 2619LM317KCT Datasheet

SimilarRFQ

LM317BT

STMicroelectronicsIn Stock: 3203LM317BT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM317BTG is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output Configuration: Positive
• Output Type: Adjustable
• Voltage - Input (Max): 40V
• Voltage - Output Range: 1.2V to 37V minimum
• Current - Output: 1.5A
• Protection Features: Over Current, Over Temperature, Short Circuit

Mechanical Compatibility Requirements:

• Package / Case: TO-220-3
• Mounting Type: Through Hole

Regulatory & Compliance Requirements:

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes: Parts from different manufacturers with identical electrical and mechanical specifications, suitable for direct replacement without circuit modification.

Similar Substitutes: Parts with minor parameter variations (such as operating temperature range or minimum output voltage) that remain functionally compatible within typical application requirements.

Parametric Equivalents: Parts with matching core electrical performance and package specifications, offering functional equivalence for standard applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

LM317KCS (Texas Instruments) and LM317AT/NOPB (Texas Instruments) are the preferred direct substitutes. Both maintain full electrical compatibility with the LM317BTG across all critical parameters. LM317AT/NOPB offers extended operating temperature range (-40°C ~ 125°C) matching the original part, making it the optimal choice for applications requiring full temperature coverage. LM317KCS is suitable for applications operating within the 0°C ~ 125°C range.

Secondary Substitutes (Functional Equivalence):

LM317BT (STMicroelectronics) provides parametric equivalence with identical minimum output voltage (1.2V) and extended temperature range (-40°C ~ 125°C). This part is recommended when supply chain diversification across manufacturers is required.

LM317T (NTE Electronics) is functionally compatible but operates within a reduced input voltage maximum (37V vs. 40V) and has lower PSRR specification (64dB vs. 80dB). This part is suitable for applications not requiring the full 40V input specification.

Parts Not Recommended for New Designs:

LM317KCSE3 carries a "Last Time Buy" status, indicating discontinued production. LM317KCT is marked obsolete and should not be selected for new applications.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use LM317KCS as a direct replacement for LM317BTG?

A: Yes. LM317KCS is electrically and mechanically compatible with LM317BTG. The primary difference is the operating temperature range (0°C ~ 125°C vs. -40°C ~ 125°C). Use LM317KCS in applications where the lower temperature limit of 0°C is acceptable.

Q: What is the difference between LM317AT/NOPB and LM317KCS?

A: Both are Texas Instruments products with identical electrical specifications. LM317AT/NOPB supports the extended temperature range (-40°C ~ 125°C) matching the original LM317BTG, while LM317KCS operates from 0°C ~ 125°C. Select LM317AT/NOPB for applications requiring full temperature coverage.

Q: Why is LM317T listed as a substitute if it has a lower input voltage maximum?

A: LM317T (37V max input) remains functionally compatible for applications where the input voltage does not exceed 37V. However, if your circuit design requires the full 40V input specification, use LM317KCS, LM317AT/NOPB, or LM317BT instead.

Q: Is LM317BT from STMicroelectronics a suitable alternative?

A: Yes. LM317BT provides parametric equivalence with matching minimum output voltage (1.2V) and extended operating temperature range (-40°C ~ 125°C). It is suitable for applications requiring manufacturer diversification while maintaining full electrical performance.

Q: Can I use LM317KCSE3 in a new design?

A: No. LM317KCSE3 is marked as "Last Time Buy," indicating the manufacturer has discontinued production. For new designs, select from active status parts: LM317KCS, LM317AT/NOPB, LM317T, or LM317BT.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All listed substitutes use the TO-220-3 package with through-hole mounting, ensuring mechanical compatibility without PCB layout modifications.

Q: What does PSRR specification mean for regulator selection?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple. Most substitutes maintain 80dB ~ 65dB (120Hz) matching the original part. LM317T has a lower PSRR of 64dB, which may be relevant in noise-sensitive applications.