LM317MKTPR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317MKTPR is a linear positive adjustable voltage regulator IC manufactured by Texas Instruments, rated for 500mA output current in a TO-252-3 (DPAK) surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The LM317 base product remains actively manufactured by multiple suppliers in various packaging configurations, ensuring design continuity and component availability.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	37V
Current - Output	500mA
Current - Quiescent (Iq)	10 mA
PSRR	80dB ~ 65dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C (TJ)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM317MKTPR is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Output configuration: Positive adjustable
Output voltage range: 1.25V to 37V minimum
Output current: 500mA
Input voltage maximum: 37V or higher
Quiescent current: 10 mA
Protection features: Over current, over temperature, short circuit

Mechanical Equivalence Requirements:

Package type: TO-252-3 (DPAK)
Mounting type: Surface mount
Pin configuration: 2 Leads + Tab

Compliance Requirements:

RoHS3 compliant
REACH unaffected status

All substitute parts listed maintain identical electrical performance specifications and physical package compatibility. Differences exist only in manufacturer, product status (active vs. obsolete), packaging format (tube, tape & reel, cut tape), and operating temperature ranges for specific variants.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Input (Max)	Voltage Output (Min)	Current Output	Operating Temp	Packaging	Inventory
LM317MKTPR	Texas Instruments	Obsolete	40V	1.25V	500mA	0°C ~ 125°C	Tube	5900 Pcs
LM317MDT/NOPB	Texas Instruments	Active	37V	1.25V	500mA	0°C ~ 125°C	Tube	2901 Pcs
LM317MDTX/NOPB	Texas Instruments	Active	37V	1.25V	500mA	0°C ~ 125°C	Tape & Reel	2200 Pcs
LM317MABDTG	onsemi	Active	40V	1.2V	500mA	-40°C ~ 125°C	Tube	2502 Pcs
LM317MABDTRKG	onsemi	Active	40V	1.2V	500mA	-40°C ~ 125°C	Cut Tape & Digi-Reel	2320 Pcs
LM317MADTRKG	onsemi	Active	40V	1.2V	500mA	0°C ~ 125°C	Tape & Reel	5100 Pcs
LM317MBDTG	onsemi	Active	40V	1.2V	500mA	-40°C ~ 125°C	Tube	485300 Pcs
LM317MBDTRKG	onsemi	Active	40V	1.2V	500mA	-40°C ~ 125°C	Cut Tape & Digi-Reel	475300 Pcs
LM317MDTG	onsemi	Active	40V	1.2V	500mA	0°C ~ 125°C	Tube	475400 Pcs
LM317MDTRKG	onsemi	Active	40V	1.2V	500mA	0°C ~ 125°C	Cut Tape & Digi-Reel	57149 Pcs

Engineering Selection Recommendations

Primary Recommendation: Texas Instruments LM317MDT/NOPB or LM317MDTX/NOPB

Both Texas Instruments variants maintain active product status and identical electrical specifications to the original LM317MKTPR. The LM317MDT/NOPB is available in tube packaging, while LM317MDTX/NOPB is supplied in tape & reel format. Both are ROHS3 compliant and REACH unaffected. Selection between these two depends on assembly process requirements: tube packaging for manual or small-batch assembly, tape & reel for automated pick-and-place operations.

Secondary Recommendation: onsemi LM317MBDTG or LM317MBDTRKG

onsemi variants offer the highest inventory availability (485,300 and 475,300 units respectively) and extended operating temperature range (-40°C to 125°C). These parts maintain 40V maximum input voltage specification matching the original LM317MKTPR. The LM317MBDTG tube format suits manual assembly, while LM317MBDTRKG cut tape & Digi-Reel format supports automated assembly. Both are ROHS3 compliant and REACH unaffected.

Alternative Consideration: onsemi LM317MDTG or LM317MDTRKG

These onsemi variants provide active status with 40V input rating and standard 0°C to 125°C operating temperature matching the original specification. Inventory levels (475,400 and 57,149 units) support production requirements. Format selection follows assembly methodology: tube for manual processes, cut tape & Digi-Reel for automated assembly.

All recommended substitutes maintain identical TO-252-3 DPAK package geometry, pin configuration, and electrical performance within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can I use LM317MDT/NOPB as a direct replacement for LM317MKTPR?

A: Yes. Both parts share identical electrical specifications (500mA output, 1.25V minimum output voltage, 0°C to 125°C operating range) and TO-252-3 DPAK package. The primary difference is product status: LM317MKTPR is obsolete while LM317MDT/NOPB is active. Packaging format differs (tube vs. tube), but electrical and mechanical compatibility is complete.

Q: What is the difference between LM317MDTX/NOPB and LM317MDT/NOPB?

A: Both are Texas Instruments LM317 regulators with identical electrical specifications. The difference is packaging format: LM317MDT/NOPB is supplied in tube packaging, while LM317MDTX/NOPB is supplied in tape & reel format. Tape & reel packaging is optimized for automated assembly lines, while tube packaging is suitable for manual or small-batch assembly.

Q: Why do onsemi parts show 1.2V minimum output voltage instead of 1.25V?

A: The 1.2V specification for onsemi variants represents a tighter tolerance or different measurement condition within the LM317 design specification. Both 1.2V and 1.25V minimum output voltages are within the functional range of the LM317 architecture and do not affect circuit compatibility. The adjustable output voltage range remains 1.2V to 37V for onsemi parts and 1.25V to 37V for Texas Instruments parts.

Q: Can I substitute an onsemi part with extended temperature range (-40°C to 125°C) for the original 0°C to 125°C specification?

A: Yes. Extended temperature range parts (LM317MABDTG, LM317MABDTRKG, LM317MBDTG, LM317MBDTRKG) are fully compatible with applications requiring only 0°C to 125°C operation. The extended range provides additional design margin and operational flexibility without compromising performance in standard temperature applications.

Q: What packaging format should I select for my assembly process?

A: Tube packaging (part numbers ending in -TG or /NOPB without suffix) is suitable for manual assembly, hand-pick operations, and low-volume production. Tape & reel packaging (part numbers ending in -TRKG or -X/NOPB) is optimized for automated pick-and-place assembly equipment and high-volume manufacturing. Cut tape & Digi-Reel format provides flexibility for both manual and semi-automated processes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, maintaining environmental and regulatory compliance equivalent to the original LM317MKTPR.

Q: Which substitute offers the best inventory availability?

A: The onsemi LM317MBDTG offers the highest inventory level at 485,300 units, followed by LM317MBDTRKG at 475,300 units. Both maintain active product status and full electrical compatibility with the original specification.

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