LM317MBDTRK Equivalent & Substitute Parts

Part Overview

The LM317MBDTRK is a linear voltage regulator IC with positive adjustable output, rated for 500mA maximum output current in a DPAK surface mount package. This component is classified as obsolete by the manufacturer (onsemi), necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The part operates across an input voltage range of up to 40V with adjustable output from 1.2V to 37V, incorporating over-current, over-temperature, and short-circuit protection features.

Substiute Parts

LM317MBDTRK

onsemiIn Stock: 900LM317MBDTRK Datasheet

Current PartRFQ

LM317MBDTRKG

onsemiIn Stock: 475336LM317MBDTRKG Datasheet

DirectRFQ

LM317MABDTRKG

onsemiIn Stock: 2352LM317MABDTRKG Datasheet

Parametric EquivalentRFQ

LM217MDT-TR

STMicroelectronicsIn Stock: 146999LM217MDT-TR Datasheet

SimilarRFQ

LM317AMDT/NOPB

Texas InstrumentsIn Stock: 4779LM317AMDT/NOPB Datasheet

SimilarRFQ

LM317AMDTX/NOPB

Texas InstrumentsIn Stock: 1923LM317AMDTX/NOPB Datasheet

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LM317MDT-TR

STMicroelectronicsIn Stock: 150266LM317MDT-TR Datasheet

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LM317MDT/NOPB

Texas InstrumentsIn Stock: 2919LM317MDT/NOPB Datasheet

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LM317MDTX/NOPB

Texas InstrumentsIn Stock: 2256LM317MDTX/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM317MBDTRK is determined by the following critical parameters: output current rating (500mA), adjustable output voltage range (1.2V to 37V minimum), maximum input voltage (40V), package type (TO-252-3 DPAK), and surface mount compatibility. Parts are grouped into two categories:

Direct Manufacturer Equivalents (onsemi): Parts maintaining identical electrical specifications and package configuration with active product status.

Cross-Manufacturer Equivalents: Parts from alternative manufacturers (STMicroelectronics, Texas Instruments) that meet or exceed the electrical specifications within the same package family, enabling direct PCB substitution.

The LM317 base product family shares functional compatibility across manufacturers. Substitutes must maintain: positive adjustable output configuration, minimum 500mA output current capability, 40V maximum input voltage rating, TO-252-3 package format, and surface mount mounting type.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

LM317MBDTRKG and LM317MABDTRKG from onsemi are direct functional equivalents with identical electrical specifications and ROHS3 compliance. Both parts maintain the 500mA output current rating, 40V maximum input voltage, and -40°C to 125°C operating temperature range. These represent the most direct replacement path for obsolete LM317MBDTRK inventory.

Secondary Substitutes (Cross-Manufacturer Options):

LM317MDT-TR from STMicroelectronics provides electrical equivalence with ROHS3 compliance. Operating temperature range is limited to 0°C to 125°C, which may restrict use in applications requiring -40°C operation.

LM317MDT/NOPB and LM317MDTX/NOPB from Texas Instruments maintain 500mA output current and ROHS3 compliance. Maximum input voltage is specified at 37V (versus 40V for onsemi variants), and operating temperature is 0°C to 125°C.

Higher Current Alternative:

LM317AMDT/NOPB and LM317AMDTX/NOPB from Texas Instruments provide 1.5A output current capability, exceeding the 500mA specification. These are suitable for applications requiring higher current delivery within the same package footprint and maintain -40°C to 125°C operating temperature range with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LM317MBDTRKG directly replace LM317MBDTRK?

A: Yes. LM317MBDTRKG is the active production equivalent from onsemi with identical electrical specifications, package type (TO-252-3 DPAK), and mounting configuration. The primary difference is ROHS3 compliance status.

Q: What is the difference between 500mA and 1.5A variants?

A: Output current rating determines maximum load current the regulator can supply. The 500mA variants (LM317MBDTRK, LM317MDT-TR, LM317MDT/NOPB) are suitable for applications requiring up to 500mA. The 1.5A variants (LM317AMDT/NOPB, LM317AMDTX/NOPB) support higher current loads. Selection depends on circuit requirements; higher-rated parts are backward compatible with lower-current applications.

Q: Are there temperature range differences between substitutes?

A: Yes. onsemi variants (LM317MBDTRKG, LM317MABDTRKG) and Texas Instruments LM317AMDT/NOPB support -40°C to 125°C. STMicroelectronics LM317MDT-TR and Texas Instruments LM317MDT/NOPB, LM317MDTX/NOPB are limited to 0°C to 125°C. Applications requiring sub-zero operation must use onsemi or Texas Instruments A-grade variants.

Q: What is the maximum input voltage for each substitute?

A: onsemi variants and STMicroelectronics LM217MDT-TR support 40V maximum input. Texas Instruments LM317MDT/NOPB and LM317MDTX/NOPB are rated for 37V maximum input. Circuit design must account for this specification when selecting substitutes.

Q: Are all substitutes ROHS3 compliant?

A: All listed active substitutes are ROHS3 compliant. The original LM317MBDTRK is RoHS non-compliant. Compliance requirements for new designs or regulatory markets necessitate selection of active equivalents.

Q: Can I use LM217MDT-TR as a substitute?

A: LM217MDT-TR from STMicroelectronics is functionally equivalent for 500mA applications. The LM217 base product number indicates a lower-grade variant compared to LM317, but electrical specifications for this specific part match the LM317MBDTRK. Operating temperature is limited to 0°C to 125°C.

Q: What packaging options are available?

A: All substitutes use TO-252-3 DPAK surface mount package. Packaging variants (Cut Tape, Digi-Reel, Tube, Tape & Reel) affect procurement and handling but do not change electrical or mechanical compatibility. Verify packaging availability with your supplier for production requirements.