LM317LZREG Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LZREG is an active linear voltage regulator IC manufactured by onsemi, classified as a positive adjustable output regulator in the Power Management (PMIC) category. This component delivers 100mA output current with adjustable voltage output ranging from 1.2V to 37V, operating across a 0°C to 125°C temperature range. The part is in active product status and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring positive adjustable linear regulation in TO-92 packaging.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Power Management (PMIC)
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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM317LZREG are classified into two categories based on parametric equivalence and similarity:

Parametric Equivalents (onsemi LM317 Series): LM317LZRAG, LM317LZRMG, and LM317LZRPG are direct parametric equivalents manufactured by onsemi. These parts share identical electrical specifications including 40V maximum input voltage, 1.2V to 37V adjustable output range, 100mA output current, 10mA quiescent current, 80dB PSRR at 120Hz, and identical protection features (Over Current, Over Temperature, Short Circuit). All three maintain the same TO-92-3 Long Body package with formed leads, through-hole mounting, and ROHS3 compliance. Substitution among these onsemi variants is based on matching output configuration (positive), output type (adjustable), number of regulators (1), and thermal operating range (0°C to 125°C).

Similar Parts (STMicroelectronics LM217/LM317 Series): LM217LZ-TR, LM317LZ-AP, and LM317LZ-TR are manufactured by STMicroelectronics and classified as similar parts. These maintain electrical compatibility across critical parameters: 40V maximum input voltage, 1.2V to 37V adjustable output range, 100mA output current, and identical package specifications (TO-92-3). Key differences include quiescent current variations (5mA for STMicroelectronics variants versus 10mA for onsemi), PSRR specification range (80dB ~ 65dB for STMicroelectronics), and operating temperature range for LM217LZ-TR (-40°C to 125°C versus 0°C to 125°C for others). Protection features vary slightly: LM217LZ-TR omits Over Current protection, while LM317LZ-AP and LM317LZ-TR include all three protection types.

Parameter Comparison

Part Number	Manufacturer	Output Config	Output Type	Voltage In (Max)	Voltage Out (Min)	Voltage Out (Max)	Current Output	Iq (mA)	PSRR	Package	Temp Range	RoHS
LM317LZREG	onsemi	Positive	Adjustable	40V	1.2V	37V	100mA	10	80dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3
LM317LZRAG	onsemi	Positive	Adjustable	40V	1.2V	37V	100mA	10	80dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3
LM317LZRMG	onsemi	Positive	Adjustable	40V	1.2V	37V	100mA	10	80dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3
LM317LZRPG	onsemi	Positive	Adjustable	40V	1.2V	37V	100mA	10	80dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3
LM217LZ-TR	STMicroelectronics	Positive	Adjustable	40V	1.2V	37V	100mA	Not specified	80dB ~ 65dB (120Hz)	TO-92-3	-40°C ~ 125°C	ROHS3
LM317LZ-AP	STMicroelectronics	Positive	Adjustable	40V	1.2V	37V	100mA	5	80dB ~ 65dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3
LM317LZ-TR	STMicroelectronics	Positive	Adjustable	40V	1.2V	37V	100mA	5	80dB ~ 65dB (120Hz)	TO-92-3	0°C ~ 125°C	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, supporting long-term availability and regulatory requirements.

onsemi Parametric Equivalents (LM317LZRAG, LM317LZRMG, LM317LZRPG): These parts are direct replacements for LM317LZREG with identical electrical and thermal specifications. Selection among these three onsemi variants is based on packaging tape configuration and inventory availability. All three are suitable for applications requiring consistent quiescent current performance (10mA) and specified PSRR characteristics (80dB at 120Hz).

STMicroelectronics Similar Parts (LM217LZ-TR, LM317LZ-AP, LM317LZ-TR): These parts provide functional equivalence with the following considerations:

LM217LZ-TR offers extended operating temperature range (-40°C to 125°C) compared to the base LM317LZREG (0°C to 125°C), supporting applications requiring low-temperature operation. However, this part omits Over Current protection, retaining only Over Temperature and Short Circuit protection.

LM317LZ-AP and LM317LZ-TR both feature reduced quiescent current (5mA versus 10mA), beneficial for low-power or battery-operated applications. Both include complete protection features (Over Current, Over Temperature, Short Circuit) and operate within the 0°C to 125°C range matching the main part.

All STMicroelectronics variants specify PSRR as a range (80dB ~ 65dB at 120Hz) rather than a fixed value, reflecting typical performance variation across the operating range.

Frequently Asked Questions (FAQ)

Q: Can LM317LZRAG, LM317LZRMG, and LM317LZRPG be used interchangeably with LM317LZREG?

A: Yes. These onsemi parts are parametric equivalents with identical electrical specifications, output configuration, output type, voltage ranges, current ratings, quiescent current, PSRR, protection features, and operating temperature range. Differences are limited to packaging tape configuration and manufacturing date codes. Direct substitution is supported without circuit modification.

Q: What are the key differences between onsemi and STMicroelectronics variants?

A: The primary differences are quiescent current (onsemi: 10mA; STMicroelectronics: 5mA for LM317 variants), PSRR specification format (onsemi: fixed 80dB; STMicroelectronics: range 80dB ~ 65dB), and protection features. LM217LZ-TR lacks Over Current protection and supports extended temperature operation (-40°C to 125°C). All maintain identical voltage ranges, output current, and package specifications.

Q: Are all substitute parts available in TO-92-3 package?

A: Yes. All listed substitute parts use TO-226-3 or TO-92-3 Long Body package with formed leads, supporting through-hole mounting. Package compatibility is confirmed across all variants.

Q: Which substitute part is recommended for low-power applications?

A: LM317LZ-AP and LM317LZ-TR (STMicroelectronics) feature 5mA quiescent current compared to 10mA for onsemi variants, reducing standby power consumption. Selection between these two depends on inventory availability and delivery requirements.

Q: Do all substitute parts meet ROHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant, supporting regulatory requirements for restricted substance compliance.

Q: Can LM217LZ-TR be used in applications requiring Over Current protection?

A: No. LM217LZ-TR provides Over Temperature and Short Circuit protection only, omitting Over Current protection. Applications requiring complete protection should use LM317LZREG, LM317LZRAG, LM317LZRMG, LM317LZRPG, LM317LZ-AP, or LM317LZ-TR.

Q: What is the impact of PSRR specification differences on circuit performance?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple. onsemi parts specify 80dB at 120Hz, while STMicroelectronics parts specify a range (80dB ~ 65dB). The range reflects typical performance variation across the operating temperature and load conditions. For applications with stringent ripple rejection requirements, onsemi variants provide more predictable performance characteristics.

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