LM317LZ Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM317LZ is a positive adjustable linear voltage regulator IC manufactured by onsemi, rated for 100mA output current in a TO-92-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The LM317 series represents a widely adopted topology for adjustable voltage regulation across multiple manufacturers, enabling direct and parametric substitution options.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM317LZ
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	TO-226-3, TO-92-3
Output Configuration	Positive
Output Type	Adjustable
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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM317LZ is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

Output Configuration: Positive (required match)
Output Type: Adjustable (required match)
Package / Case: TO-226-3 or TO-92-3 (required match)
Voltage - Input (Max): 40V or greater
Voltage - Output (Min/Fixed): 1.2V (required match)
Voltage - Output (Max): 37V or greater
Current - Output: 100mA (required match)
Protection Features: Over Current, Over Temperature, Short Circuit (required match)
Mounting Type: Through Hole (required match)

Substitution Categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging across different manufacturers or product status levels. These parts are pin-compatible and functionally equivalent.

Similar Manufacturer Substitutes share the same base product number (LM317) and core electrical specifications but may have extended operating temperature ranges or automotive-grade qualifications. These are suitable where environmental or qualification requirements differ from the original specification.

Parametric Equivalents from alternative manufacturers meet all critical electrical and mechanical parameters while maintaining functional compatibility.

Parameter Comparison

Parameter	LM317LZ (onsemi)	LM317LZG (onsemi)	LM317LBZG (onsemi)	NCV317LBZG (onsemi)	LM317LCLP (TI)	LM317LZ/NOPB (TI)	LM317LZ (STMicroelectronics)
Product Status	Obsolete	Active	Active	Active	Last Time Buy	Active	Active
Voltage - Input (Max)	40V	40V	40V	40V	38V	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	37V	32V	37V	37V
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	10 mA	10 mA	10 mA	10 mA	2.5 mA	5 mA	5 mA
PSRR	80dB (120Hz)	80dB (120Hz)	80dB (120Hz)	80dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)	80dB ~ 65dB (120Hz)
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3 Long Body	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Manufacturer	onsemi	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	STMicroelectronics

Engineering Selection Recommendations

For Active Production: LM317LZG (onsemi) and LM317LZ/NOPB (Texas Instruments) are recommended as primary substitutes. Both maintain active product status, full electrical compatibility, and extended operating temperature ranges. LM317LZG offers bulk packaging with immediate availability, while LM317LZ/NOPB provides the highest inventory levels (326,900 pcs) and established supply chain presence.

For Extended Temperature Applications: LM317LBZG (onsemi) and LM317LZ/NOPB (Texas Instruments) support -40°C to 125°C operating range, suitable for industrial and automotive environments beyond the original 0°C to 125°C specification.

For Automotive Applications: NCV317LBZG (onsemi) is qualified to AEC-Q100 automotive standards with -40°C to 125°C operating temperature, appropriate for automotive-grade designs requiring formal qualification documentation.

For Cost-Optimized Designs: LM317LCLP (Texas Instruments) offers reduced quiescent current (2.5 mA) compared to the original specification (10 mA), providing power efficiency benefits. Note this part carries Last Time Buy status and limited inventory (1,557 pcs).

For Parametric Equivalence: LM317LZ from STMicroelectronics provides direct electrical and mechanical compatibility with active product status and substantial inventory availability (48,310 pcs).

All recommended substitutes maintain ROHS3 compliance, identical protection features (Over Current, Over Temperature, Short Circuit), and through-hole mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use LM317LBZG as a direct replacement for LM317LZ?

A: Yes. LM317LBZG meets all critical electrical parameters (40V input maximum, 1.2V to 37V output range, 100mA output current) and shares the same TO-92-3 package. The extended operating temperature range (-40°C to 125°C versus 0°C to 125°C) provides additional capability without compromising compatibility.

Q: What is the difference between LM317LZG and LM317LBZG?

A: Both are onsemi LM317 variants with identical electrical specifications. The primary differences are packaging format (Bulk versus Tube) and operating temperature range (0°C to 125°C versus -40°C to 125°C). Selection depends on environmental requirements and packaging preferences.

Q: Is NCV317LBZG suitable for non-automotive applications?

A: Yes. NCV317LBZG meets all electrical and mechanical requirements for standard applications. The automotive qualification (AEC-Q100) and extended temperature range represent additional capabilities. Use this part when automotive-grade reliability or extended temperature operation is required.

Q: Why does LM317LCLP have lower quiescent current?

A: LM317LCLP from Texas Instruments specifies 2.5 mA quiescent current compared to 10 mA for the original LM317LZ. This represents a design variation within the LM317 family. Both values are acceptable for the same functional application; lower quiescent current reduces standby power consumption.

Q: Can I substitute LM317LZ/NOPB for LM317LZ in all applications?

A: Yes. LM317LZ/NOPB from Texas Instruments maintains identical electrical specifications and TO-92-3 packaging. The extended operating temperature range (-40°C to 125°C) and lower quiescent current (5 mA) provide enhanced performance characteristics suitable for all original applications.

Q: What does "Last Time Buy" status mean for LM317LCLP?

A: Last Time Buy indicates this part is in final production phase with no future manufacturing planned. Existing inventory is available for purchase, but supply is limited (1,557 pcs). For new designs, select from Active status alternatives to ensure long-term availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory requirements of the original LM317LZ.

Q: Does package size differ between TO-92-3 and TO-92-3 Long Body variants?

A: TO-92-3 Long Body variants (LM317LZG, LM317LBZG, NCV317LBZG) maintain the same pin configuration and electrical interface as standard TO-92-3. Physical dimensions may vary slightly; verify PCB layout compatibility if space constraints exist.

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