LM317LZRE Equivalent & Substitute Parts

Part Overview

The LM317LZRE is a linear voltage regulator IC with positive adjustable output, rated for 100mA maximum output current in a TO-92 package. Manufactured by onsemi, this component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. The LM317 series 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 Long Body (Formed Leads)

Substitute Part Grouping Explanation

Substitute parts for the LM317LZRE are classified based on electrical parameter compatibility and product status. The primary substitution criteria are:

Direct Manufacturer Equivalents (onsemi): Parts LM317LZREG, LM317LZRAG, and LM317LZRPG maintain identical electrical specifications to the main part while offering active product status and improved RoHS3 compliance. These differ only in packaging configuration (Cut Tape vs. Tube) and manufacturing date codes.

Parametric Equivalents (onsemi): LM317LZRMG provides full electrical parameter compatibility with active status and RoHS3 compliance.

Similar Cross-Manufacturer Parts: LM217LZ-TR (STMicroelectronics), LM317LCLPR (Texas Instruments), LM317LZ-AP (STMicroelectronics), and LM317LZ-TR (STMicroelectronics) maintain core electrical specifications including 100mA output current, 40V maximum input voltage, and 1.2V to 37V adjustable output range. Minor variations exist in quiescent current and operating temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Input (Max)	Voltage Output (Min/Max)	Current Output	Iq (mA)	PSRR (120Hz)	Operating Temp	RoHS Status
LM317LZRE	onsemi	Obsolete	40V	1.2V / 37V	100mA	10	80dB	0°C ~ 125°C	Non-compliant
LM317LZREG	onsemi	Active	40V	1.2V / 37V	100mA	10	80dB	0°C ~ 125°C	ROHS3 Compliant
LM317LZRAG	onsemi	Active	40V	1.2V / 37V	100mA	10	80dB	0°C ~ 125°C	ROHS3 Compliant
LM317LZRMG	onsemi	Active	40V	1.2V / 37V	100mA	10	80dB	0°C ~ 125°C	ROHS3 Compliant
LM317LZRPG	onsemi	Active	40V	1.2V / 37V	100mA	10	80dB	0°C ~ 125°C	ROHS3 Compliant
LM217LZ-TR	STMicroelectronics	Active	40V	1.2V / 37V	100mA	Not specified	80dB ~ 65dB	-40°C ~ 125°C	ROHS3 Compliant
LM317LCLPR	Texas Instruments	Last Time Buy	38V	1.2V / 32V	100mA	2.5	80dB ~ 65dB	0°C ~ 125°C	ROHS3 Compliant
LM317LZ-AP	STMicroelectronics	Active	40V	1.2V / 37V	100mA	5	80dB ~ 65dB	0°C ~ 125°C	ROHS3 Compliant
LM317LZ-TR	STMicroelectronics	Active	40V	1.2V / 37V	100mA	5	80dB ~ 65dB	0°C ~ 125°C	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM317LZREG, LM317LZRAG, or LM317LZRPG (onsemi) are direct functional equivalents with identical electrical specifications and active product status. These parts provide ROHS3 compliance and eliminate obsolescence risk associated with the LM317LZRE.

Secondary Recommendation: LM317LZRMG (onsemi) offers equivalent performance with active status and ROHS3 compliance.

Cross-Manufacturer Alternatives: LM317LZ-AP and LM317LZ-TR (STMicroelectronics) provide full electrical compatibility with active product status and extended lower operating temperature range (-40°C minimum for LM217LZ-TR). These are suitable for applications requiring cross-manufacturer sourcing flexibility.

Conditional Use: LM317LCLPR (Texas Instruments) is classified as Last Time Buy with reduced maximum input voltage (38V vs. 40V) and output voltage (32V vs. 37V). This part is suitable only for applications operating within these reduced voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can LM317LZREG directly replace LM317LZRE without circuit modification?

A: Yes. LM317LZREG maintains identical electrical specifications including output voltage range (1.2V to 37V), maximum output current (100mA), maximum input voltage (40V), and protection features. The primary difference is product status (Active vs. Obsolete) and RoHS compliance level.

Q: What is the difference between LM317LZREG, LM317LZRAG, and LM317LZRPG?

A: These three parts are electrically identical. The differences are in packaging configuration and manufacturing date codes. LM317LZREG and LM317LZRAG are supplied in Cut Tape packaging, while LM317LZRPG is also in Cut Tape. Selection depends on procurement and assembly requirements.

Q: Are STMicroelectronics LM317LZ-AP and LM317LZ-TR suitable replacements?

A: Yes, both parts are suitable replacements. They maintain the same output voltage range (1.2V to 37V), 100mA output current, and 40V maximum input voltage. Minor differences include lower quiescent current (5mA vs. 10mA) and extended lower operating temperature range for LM217LZ-TR (-40°C vs. 0°C).

Q: Why is LM317LCLPR listed as a similar part rather than a direct equivalent?

A: LM317LCLPR has reduced maximum input voltage (38V vs. 40V) and maximum output voltage (32V vs. 37V). It is suitable only for applications operating within these reduced specifications. Additionally, it is classified as Last Time Buy, indicating discontinued production.

Q: Are all substitute parts available in the same TO-92 package?

A: Yes. All listed substitute parts use TO-226-3 or TO-92-3 package configurations with formed leads, ensuring mechanical and pin compatibility with the LM317LZRE.

Q: What is the significance of RoHS3 compliance for these parts?

A: RoHS3 compliance indicates conformance to current environmental and hazardous substance restrictions. The LM317LZRE is RoHS non-compliant, while all active substitute parts (LM317LZREG, LM317LZRAG, LM317LZRMG, LM317LZRPG, and cross-manufacturer alternatives) are ROHS3 compliant, supporting modern procurement and regulatory requirements.

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