LM317LBDR2 Equivalent & Substitute Parts

Part Overview

The LM317LBDR2 is a linear voltage regulator IC from onsemi designed for positive adjustable output applications. It delivers 100mA output current with adjustable voltage ranging from 1.2V to 37V, housed in an 8-SOIC surface mount package. The device includes integrated protection features for overcurrent, overtemperature, and short circuit conditions.

The LM317LBDR2 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active production status and improved compliance certifications.

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	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the LM317LBDR2 is determined by the following critical parameters:

Output configuration (Positive)
Output type (Adjustable)
Voltage range capability (Input Max 40V, Output 1.2V to 37V)
Current rating (100mA)
Package type (8-SOIC)
Protection features (Over Current, Over Temperature, Short Circuit)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in quiescent current, PSRR performance, and operating temperature ranges are secondary parameters that do not prevent functional substitution within the specified application envelope.

Parameter Comparison

Parameter	LM317LBDR2	LM317LBDR2G	NCV317LBDR2G	LM317LIDR	LM317LMX	LM317LMX/NOPB
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	onsemi	Texas Instruments
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	40V	40V	40V	38V	40V	40V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Voltage - Output (Max)	37V	37V	37V	32V	37V	37V
Current - Output	100mA	100mA	100mA	100mA	100mA	100mA
Current - Quiescent (Iq)	10 mA	10 mA	10 mA	2.5 mA	10 mA	5 mA
PSRR	80dB (120Hz)	80dB (120Hz)	80dB (120Hz)	80dB ~ 65dB (120Hz)	80dB (120Hz)	80dB ~ 65dB (120Hz)
Protection Features	Over Current, 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	Over Current, Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the LM317LBDR2, the following selection criteria apply:

Primary Recommendation: LM317LBDR2G (onsemi) Active product status with ROHS3 compliance. Identical electrical specifications to the original part. Maintains onsemi manufacturing continuity. Suitable for new designs and production transitions.

Alternative: LM317LMX/NOPB (Texas Instruments) Active product status with ROHS3 compliance. Reduced quiescent current (5mA vs 10mA) provides improved power efficiency. Identical voltage and current ratings. Recommended for power-sensitive applications.

Automotive Grade Option: NCV317LBDR2G (onsemi) Active product status with ROHS3 compliance and AEC-Q100 automotive qualification. Identical electrical specifications. Suitable for automotive and high-reliability applications requiring automotive-grade components.

Lower Quiescent Current Option: LM317LIDR (Texas Instruments) Active product status with ROHS3 compliance. Lowest quiescent current (2.5mA). Maximum input voltage limited to 38V and maximum output voltage to 32V. Suitable for applications operating within these voltage constraints where power efficiency is critical.

Obsolete Alternative: LM317LMX (onsemi) Obsolete status with identical electrical specifications to LM317LBDR2. Operating temperature range limited to 0°C ~ 125°C. Not recommended for new designs; use only for legacy system maintenance where supply exists.

Frequently Asked Questions (FAQ)

Q: Can LM317LIDR replace LM317LBDR2 in all applications? A: LM317LIDR is electrically compatible for applications where input voltage does not exceed 38V and output voltage does not exceed 32V. The original LM317LBDR2 supports up to 40V input and 37V output. Verify your application voltage requirements before substitution.

Q: What is the difference between LM317LBDR2G and NCV317LBDR2G? A: Both parts are parametrically equivalent with identical electrical specifications. NCV317LBDR2G carries AEC-Q100 automotive qualification and is designated for automotive applications. LM317LBDR2G is the standard industrial-grade equivalent. Select based on application requirements.

Q: Why is LM317LMX/NOPB recommended for power-sensitive designs? A: LM317LMX/NOPB has a quiescent current of 5mA compared to 10mA in the original LM317LBDR2. This 50% reduction in standby current consumption benefits battery-powered and low-power applications while maintaining all other electrical specifications.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package. PCB layout and footprint compatibility is maintained across all substitutes.

Q: Which substitute part has the best compliance status? A: LM317LBDR2G, NCV317LBDR2G, LM317LIDR, and LM317LMX/NOPB all carry ROHS3 compliance. The original LM317LBDR2 is RoHS non-compliant. For new designs and regulatory compliance, select any of the four ROHS3-compliant alternatives.

Q: Can I use LM317LMX for new production? A: LM317LMX is classified as obsolete. It is not recommended for new designs. Use LM317LBDR2G or LM317LMX/NOPB for active production to ensure long-term supply chain stability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message