LM317LZXA Equivalent & Substitute Parts

Part Overview

The LM317LZXA is a linear voltage regulator IC from onsemi, configured for positive adjustable output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The LM317LZXA provides adjustable output voltage regulation from 1.2V to 37V with integrated protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
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	100mA
Current - Quiescent (Iq)	10 mA
PSRR	80dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution eligibility for the LM317LZXA is determined by 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), output current (100mA), package type (TO-92-3), and protection features (over-current, over-temperature, short-circuit).

All substitute parts listed maintain identical electrical specifications across these parameters. Variations in operating temperature range, quiescent current, and product status (active vs. obsolete) do not affect functional substitution capability. Packaging designation differences (Cut Tape vs. standard) reflect only procurement format and do not impact electrical or mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Config	Output Type	Voltage In (Max)	Voltage Out (Min-Max)	Current Output	Iq (mA)	Operating Temp	Package
LM317LZXA	onsemi	Obsolete	Positive	Adjustable	40V	1.2V - 37V	100mA	10	0°C ~ 125°C	TO-92-3
LM317LBZRPG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	-40°C ~ 125°C	TO-92-3
LM317LBZRAG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	-40°C ~ 125°C	TO-92-3
LM317LZRAG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	0°C ~ 125°C	TO-92-3
LM317LZREG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	0°C ~ 125°C	TO-92-3
LM317LZRMG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	0°C ~ 125°C	TO-92-3
LM317LZRPG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	0°C ~ 125°C	TO-92-3
NCV317LBZRAG	onsemi	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	10	-40°C ~ 125°C	TO-92-3
LM317LZ/LFT4	Texas Instruments	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	5	-40°C ~ 125°C	TO-92-3
LM217LZ-TR	STMicroelectronics	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	Not specified	-40°C ~ 125°C	TO-92-3
LM317LZ-AP	STMicroelectronics	Active	Positive	Adjustable	40V	1.2V - 37V	100mA	5	0°C ~ 125°C	TO-92-3

Engineering Selection Recommendations

onsemi LM317 Series (Active Status): LM317LBZRPG, LM317LBZRAG, LM317LZRAG, LM317LZREG, LM317LZRMG, and LM317LZRPG are direct active replacements from the original manufacturer. All are RoHS3 compliant and maintain identical electrical performance. Selection among these variants depends on operating temperature requirements: parts with -40°C to 125°C range (LBZRPG, LBZRAG) provide extended low-temperature operation compared to 0°C to 125°C variants.

NCV317LBZRAG (Automotive Grade): This variant is AEC-Q100 qualified and suitable for automotive applications requiring extended temperature operation (-40°C to 125°C). Use this part only if automotive qualification is a design requirement.

Texas Instruments LM317LZ/LFT4: This cross-manufacturer substitute maintains full electrical compatibility with lower quiescent current (5mA vs. 10mA), extended operating temperature range (-40°C to 125°C), and active product status. RoHS3 compliant.

STMicroelectronics LM217LZ-TR and LM317LZ-AP: Both are active cross-manufacturer alternatives with RoHS3 compliance. LM217LZ-TR operates across -40°C to 125°C. LM317LZ-AP provides lower quiescent current (5mA) with 0°C to 125°C operation.

For obsolete part replacement, prioritize active-status parts from the original onsemi manufacturer (LM317 series) for supply chain continuity. Cross-manufacturer alternatives are functionally equivalent and suitable when onsemi inventory is unavailable.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM317LZXA with any of the listed substitutes? A: Yes. All listed parts maintain identical electrical specifications for output configuration, output type, voltage ranges, current rating, and protection features. Physical package dimensions are equivalent across all TO-92-3 variants.

Q: What is the difference between onsemi LM317 variants (LBZRPG, LZRAG, LZREG, LZRMG, LZRPG)? A: These variants differ in operating temperature range and packaging format. LBZRPG and LBZRAG support -40°C to 125°C operation, while LZRAG, LZREG, LZRMG, and LZRPG operate from 0°C to 125°C. All maintain identical electrical performance within their respective temperature ranges.

Q: Is NCV317LBZRAG suitable for non-automotive applications? A: Yes. NCV317LBZRAG is functionally equivalent to standard LM317 parts. The automotive qualification (AEC-Q100) is an additional certification that does not restrict use in non-automotive designs.

Q: How does quiescent current affect substitution? A: Quiescent current (Iq) does not affect functional substitution. The LM317LZXA specifies 10mA Iq, while some alternatives (LM317LZ/LFT4, LM317LZ-AP) specify 5mA. Lower Iq reduces standby power consumption but does not impact voltage regulation performance or output current capability.

Q: Can I use cross-manufacturer parts (Texas Instruments, STMicroelectronics) as direct replacements? A: Yes. LM317LZ/LFT4 (Texas Instruments), LM217LZ-TR, and LM317LZ-AP (STMicroelectronics) are functionally equivalent. All maintain the same electrical specifications, package type, and protection features. Cross-manufacturer substitution is standard practice when original manufacturer parts are unavailable.

Q: What does "Cut Tape (CT)" packaging mean? A: Cut Tape refers to the procurement format—components are supplied on cut sections of carrier tape rather than full reels. This does not affect electrical or mechanical compatibility. The physical component and package remain identical.

Q: Should I consider operating temperature range when selecting a substitute? A: Operating temperature range should match your application requirements. If your design operates only within 0°C to 125°C, any listed part is suitable. For applications requiring -40°C operation, select parts explicitly rated for that range (LBZRPG, LBZRAG, LM317LZ/LFT4, LM217LZ-TR).

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