LM317LZTFR Equivalent & Substitute Parts

Part Overview

The LM317LZTFR is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 100mA current capability in a TO-92-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The LM317LZTFR operates as a single-output positive adjustable regulator suitable for applications requiring voltage regulation from 1.2V to 37V with input voltages up to 40V. The device includes integrated protection features for overcurrent, overtemperature, and short circuit conditions.

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
Base Product Number	LM317

Substitute Part Grouping Explanation

Substitute parts for the LM317LZTFR are classified based on the following substitution criteria:

Direct Manufacturer Substitutes maintain identical electrical specifications and package configuration, differing only in packaging format (Cut Tape vs. Formed Leads) or product status (Active vs. Obsolete).

Similar Manufacturer Substitutes share all critical electrical parameters including voltage ranges, current ratings, protection features, and package type, with variations in operating temperature range or quiescent current specifications.

Parametric Equivalents from alternative manufacturers (STMicroelectronics) provide functionally equivalent performance across all specified electrical parameters and package requirements.

Automotive Grade Alternatives meet the same electrical specifications with additional automotive qualification (AEC-Q100) for applications requiring automotive-grade components.

The key parameters determining substitutability are:

Output Configuration (Positive)
Output Type (Adjustable)
Voltage ranges (Input Max 40V, Output 1.2V to 37V)
Current rating (100mA output)
Package type (TO-92-3 / TO-226-3)
Protection features (Over Current, Over Temperature, Short Circuit)

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Config	Voltage In (Max)	Voltage Out (Min/Max)	Current Output	Iq (mA)	Operating Temp	Package	RoHS Status
LM317LZTFR	onsemi	Obsolete	Positive	40V	1.2V / 37V	100mA	10	0°C ~ 125°C	TO-92-3	Not Specified
LM317LBZRPG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	-40°C ~ 125°C	TO-92	ROHS3 Compliant
LM317LBZRAG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	-40°C ~ 125°C	TO-92	ROHS3 Compliant
LM317LZRAG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	0°C ~ 125°C	TO-92	ROHS3 Compliant
LM317LZREG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	0°C ~ 125°C	TO-92	ROHS3 Compliant
LM317LZRMG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	0°C ~ 125°C	TO-92	ROHS3 Compliant
LM317LZRPG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	0°C ~ 125°C	TO-92	ROHS3 Compliant
NCV317LBZRAG	onsemi	Active	Positive	40V	1.2V / 37V	100mA	10	-40°C ~ 125°C	TO-92	ROHS3 Compliant
LM217LZ-TR	STMicroelectronics	Active	Positive	40V	1.2V / 37V	100mA	Not Specified	-40°C ~ 125°C	TO-92-3	ROHS3 Compliant
LM317LZ-TR	STMicroelectronics	Active	Positive	40V	1.2V / 37V	100mA	5	0°C ~ 125°C	TO-92-3	ROHS3 Compliant
LM317LZ-AP	STMicroelectronics	Active	Positive	40V	1.2V / 37V	100mA	5	0°C ~ 125°C	TO-92-3	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Obsolete to Active Transition): LM317LBZRPG and LM317LBZRAG are direct onsemi substitutes with active product status and ROHS3 compliance. Both support extended operating temperature range (-40°C to 125°C) compared to the original part (0°C to 125°C), providing improved thermal margin for industrial applications.

For Temperature-Matched Selection: LM317LZRAG, LM317LZREG, LM317LZRMG, and LM317LZRPG maintain the original 0°C to 125°C operating range while offering active product status and ROHS3 compliance. These are suitable for applications with identical thermal requirements.

For Automotive Applications: NCV317LBZRAG provides automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 125°C) and ROHS3 compliance, appropriate for automotive or harsh environment deployments.

For Cross-Manufacturer Sourcing: STMicroelectronics LM317LZ-TR and LM317LZ-AP provide parametric equivalence with active product status and ROHS3 compliance. LM317LZ-AP offers the highest inventory availability (17,962 pcs) for long-term supply security. Both maintain identical electrical specifications and TO-92-3 package compatibility.

LM217LZ-TR from STMicroelectronics is a lower-cost alternative with identical package and voltage specifications, though it lacks specified overcurrent protection in the provided data.

Frequently Asked Questions (FAQ)

Q: Can LM317LBZRPG directly replace LM317LZTFR in existing designs? A: Yes. Both parts share identical electrical specifications (40V input, 1.2V to 37V adjustable output, 100mA current, TO-92-3 package). The primary difference is product status (Active vs. Obsolete) and extended operating temperature range (-40°C to 125°C vs. 0°C to 125°C). Designs operating within 0°C to 125°C require no modification.

Q: What is the difference between onsemi LM317 variants (LBZRPG, LZRAG, LZREG, LZRMG, LZRPG)? A: All variants share identical electrical specifications and package type. Differences are in packaging format (Cut Tape vs. Formed Leads) and temperature range. LBZRPG and LBZRAG support -40°C to 125°C; LZRAG, LZREG, LZRMG, and LZRPG support 0°C to 125°C. Selection depends on application temperature requirements and packaging preference.

Q: Are STMicroelectronics LM317 parts compatible with onsemi LM317LZTFR? A: Yes. STMicroelectronics LM317LZ-TR and LM317LZ-AP maintain identical electrical specifications and TO-92-3 package compatibility. Both are ROHS3 compliant and active products. Quiescent current is lower (5mA vs. 10mA), which may improve efficiency in low-power applications.

Q: What is the difference between LM317 and LM217? A: Both are positive adjustable linear regulators with identical voltage and current specifications. LM217LZ-TR from STMicroelectronics supports extended temperature range (-40°C to 125°C). The primary distinction is manufacturer and specific protection feature implementation. Both are functionally equivalent for the specified electrical parameters.

Q: Should I select NCV317LBZRAG for non-automotive applications? A: NCV317LBZRAG is suitable for any application. The automotive qualification (AEC-Q100) indicates additional manufacturing and testing rigor, making it appropriate for high-reliability or harsh environment applications regardless of automotive use. It provides extended temperature range (-40°C to 125°C) and ROHS3 compliance.

Q: Which substitute offers the best long-term availability? A: LM317LZ-AP from STMicroelectronics has the highest inventory (17,962 pcs) among listed substitutes, providing supply security for high-volume or long-term production requirements.

Q: Are all substitutes ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original LM317LZTFR (obsolete) does not specify RoHS status in the provided data.

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