LM317MDTRK Equivalent & Substitute Parts

Part Overview

The LM317MDTRK is a linear voltage regulator IC from onsemi designed for positive adjustable output applications with 500mA current capability in a DPAK surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM317MDTRK serves as a positive adjustable voltage regulator suitable for applications requiring output voltage adjustment between 1.2V and 37V with input voltages up to 40V.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
Product Status	Obsolete
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.2V
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
Mounting Type	Surface Mount
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM317MDTRK is determined by strict equivalence across the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Number of regulators (1)
Maximum input voltage (40V)
Output voltage range (1.2V to 37V minimum)
Output current capability (500mA)
Protection features (Over Current, Over Temperature, Short Circuit)
Package type (TO-252-3 / DPAK)
Mounting type (Surface Mount)

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional compatibility in applications designed for the LM317MDTRK.

Parameter Comparison

Parameter	LM317MDTRK (Main)	LM317MDTRKG (onsemi)	LM317MKVURG3 (Texas Instruments)
Manufacturer	onsemi	onsemi	Texas Instruments
Product Status	Obsolete	Active	Active
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1
Voltage - Input (Max)	40V	40V	40V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.25V
Voltage - Output (Max)	37V	37V	37V
Current - Output	500mA	500mA	500mA
Current - Quiescent (Iq)	10 mA	10 mA	10 mA
PSRR	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

LM317MDTRKG (onsemi) is the primary substitute for the obsolete LM317MDTRK. Both parts are from the same manufacturer and share identical electrical specifications and package configuration. The LM317MDTRKG carries Active product status and is ROHS3 compliant, making it suitable for new designs and production environments with RoHS requirements. Inventory availability is significantly higher (57,149 pcs) compared to the original part.

LM317MKVURG3 (Texas Instruments) is a cross-manufacturer substitute that maintains all critical electrical parameters and package compatibility. This part is also Active and ROHS3 compliant. The operating temperature range extends to -40°C, providing broader environmental coverage than the original part. The minimum output voltage specification differs slightly at 1.25V versus 1.2V, which may affect applications requiring output voltages below 1.25V. Moisture sensitivity level is rated at MSL 3 (168 Hours) compared to MSL 1 for the original part, requiring appropriate handling during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can LM317MDTRKG directly replace LM317MDTRK in existing designs?

A: Yes. The LM317MDTRKG maintains identical electrical specifications, output voltage range, current capability, protection features, and TO-252-3 DPAK package configuration. No circuit modifications are required.

Q: What is the difference between LM317MDTRKG and LM317MKVURG3?

A: Both parts are functionally equivalent for most applications. Key differences include manufacturer (onsemi vs. Texas Instruments), operating temperature range (-40°C to 125°C for TI versus 0°C to 125°C for onsemi), minimum output voltage specification (1.25V vs. 1.2V), and moisture sensitivity level (MSL 3 vs. MSL 1). The Texas Instruments part offers extended low-temperature operation.

Q: Is the LM317MDTRK still available for purchase?

A: The LM317MDTRK is classified as obsolete. Substitute parts LM317MDTRKG and LM317MKVURG3 are both in active production with substantial inventory availability.

Q: Does the minimum output voltage difference (1.2V vs. 1.25V) affect compatibility?

A: For applications requiring output voltages at or above 1.25V, both parts are fully compatible. Applications specifically designed for 1.2V output should use the LM317MDTRKG or verify that 1.25V meets system requirements.

Q: What are the RoHS compliance implications?

A: The original LM317MDTRK is RoHS non-compliant. Both substitute parts (LM317MDTRKG and LM317MKVURG3) are ROHS3 compliant, meeting current environmental and regulatory standards for new designs and production.

Q: Are there packaging differences between these parts?

A: All three parts use the TO-252-3 DPAK surface mount package. The LM317MDTRKG is available in Cut Tape (CT) and Digi-Reel packaging, while the LM317MKVURG3 is also available in Cut Tape and Digi-Reel formats.

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