LM317LZRPG Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LZRPG is a positive adjustable linear voltage regulator manufactured by onsemi, designed for applications requiring variable output voltage regulation from 1.2V to 37V at 100mA output current. The device is housed in a TO-92 package and features integrated protection against overcurrent, overtemperature, and short circuit conditions. With an active product status and ROHS3 compliance, the LM317LZRPG serves as a standard component in power management circuits. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and regulatory compliance to support design flexibility and supply chain continuity.

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)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM317LZRPG are classified based on electrical parameter equivalence and mechanical compatibility. The primary substitution criteria are:

Electrical Equivalence Parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage range: Input maximum 40V, output 1.2V to 37V
Output current: 100mA
Protection features: Over current, over temperature, short circuit

Mechanical Compatibility:

Package type: TO-92-3 / TO-226-3 through-hole configuration
Formed leads for standard PCB mounting

Regulatory Compliance:

ROHS3 compliance
REACH unaffected status
EAR99 classification

Parts meeting all three criteria categories are classified as parametric equivalents. Parts with minor variations in quiescent current, PSRR specifications, or operating temperature ranges are classified as similar alternatives, provided core electrical and mechanical parameters remain compatible.

Parameter Comparison

Parameter	LM317LZRPG (onsemi)	LM317LZRMG (onsemi)	LM217LZ-TR (STMicroelectronics)	LM317LCLP (Texas Instruments)	LM317LZ-AP (STMicroelectronics)	LM317LZ-TR (STMicroelectronics)	LM317LZ/LFT4 (Texas Instruments)
Manufacturer	onsemi	onsemi	STMicroelectronics	Texas Instruments	STMicroelectronics	STMicroelectronics	Texas Instruments
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	40V	40V	40V	38V	40V	40V	40V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Voltage - Output (Max)	37V	37V	37V	32V	37V	37V	37V
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	10 mA	10 mA	Not specified	2.5 mA	5 mA	5 mA	5 mA
PSRR	80dB (120Hz)	80dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	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	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent: LM317LZRMG (onsemi) is a direct parametric equivalent with identical electrical specifications and active product status. This part is suitable for direct substitution in all applications where the LM317LZRPG is specified.

Primary Alternatives (Active Status): LM317LZ-AP, LM317LZ-TR (STMicroelectronics), and LM317LZ/LFT4 (Texas Instruments) are functionally compatible alternatives with active product status. These parts maintain core electrical parameters and TO-92-3 package compatibility. Quiescent current variations (5 mA vs. 10 mA) and PSRR specification ranges are within acceptable tolerance for standard voltage regulation applications.

Extended Temperature Range Options: LM217LZ-TR (STMicroelectronics) and LM317LZ/LFT4 (Texas Instruments) support extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring wider temperature performance.

Limited Availability: LM317LCLP (Texas Instruments) carries Last Time Buy status with reduced maximum output voltage (32V vs. 37V) and lower quiescent current (2.5 mA). This part is suitable only for applications operating within 32V maximum output specification.

Compliance Verification: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 classification, ensuring regulatory alignment with the original LM317LZRPG specification.

Frequently Asked Questions (FAQ)

Q: Can LM317LZRMG replace LM317LZRPG in existing designs? A: Yes. LM317LZRMG is a parametric equivalent with identical electrical specifications, package configuration, and regulatory compliance. Direct substitution is supported without design modification.

Q: What is the difference between onsemi and STMicroelectronics LM317 variants? A: Both manufacturers produce functionally equivalent LM317 regulators meeting the same core specifications. Differences exist in quiescent current (5 mA vs. 10 mA), PSRR specification ranges, and operating temperature ranges. Selection depends on application requirements for power consumption and temperature performance.

Q: Is LM317LCLP suitable as a substitute? A: LM317LCLP is compatible for applications where maximum output voltage does not exceed 32V. The part carries Last Time Buy status, indicating limited future availability. For new designs, active-status alternatives are recommended.

Q: Do all substitute parts use the same TO-92-3 package? A: Yes. All listed substitute parts use TO-92-3 / TO-226-3 through-hole package configuration with formed leads, ensuring mechanical compatibility with existing PCB layouts.

Q: What is the impact of quiescent current differences? A: Quiescent current variations (2.5 mA to 10 mA) affect standby power consumption. Applications with strict power budget requirements should select parts with lower Iq specifications. For standard voltage regulation, these differences are typically negligible.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute offers the widest operating temperature range? A: LM217LZ-TR and LM317LZ/LFT4 support -40°C ~ 125°C operating range, compared to 0°C ~ 125°C for other variants. These parts are suitable for industrial and extended-temperature applications.

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