LM337T Equivalent & Substitute Parts

Part Overview

The LM337T is a linear voltage regulator IC from onsemi designed for negative adjustable output applications. It delivers 1.5A output current in a TO-220-3 package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. The LM337T series remains functionally relevant for applications requiring negative voltage regulation with adjustable output levels.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	LM337T
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Negative
Output Type	Adjustable
Current - Output	1.5A
Voltage - Input (Max)	-40V
Voltage - Output (Min/Fixed)	-1.2V
Voltage - Output (Max)	-37V
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM337T is determined by strict alignment of the following electrical and mechanical parameters:

Output Configuration: Negative
Output Type: Adjustable
Current - Output: 1.5A
Voltage - Input (Max): -40V
Voltage - Output Range: -1.2V to -37V
Package / Case: TO-220-3
Mounting Type: Through Hole
Base Product Number: LM337

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging from onsemi, with active product status and improved performance characteristics.

Similar Manufacturer Parts are functionally equivalent devices from alternative manufacturers (STMicroelectronics, Texas Instruments) that meet all core electrical and mechanical requirements while offering active product status and compliance certifications.

Parametric Equivalents are parts that satisfy all critical electrical parameters and package requirements but may differ in minor specifications such as PSRR performance or temperature range extensions.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Current	Voltage Input (Max)	Voltage Output Range	Package	Operating Temp	PSRR (120Hz)	Protection Features
LM337T	onsemi	Obsolete	1.5A	-40V	-1.2V to -37V	TO-220-3	0°C ~ 125°C	60dB	Over Temperature, Short Circuit
LM337TG	onsemi	Active	1.5A	-40V	-1.2V to -37V	TO-220-3	0°C ~ 125°C	77dB	Over Current, Over Temperature
LM337BTG	onsemi	Active	1.5A	-40V	-1.2V to -37V	TO-220-3	-40°C ~ 125°C	77dB	Over Current, Over Temperature
LM337SP	STMicroelectronics	Active	1.5A	-40V	-1.2V to -37V	TO-220-3	0°C ~ 125°C	77dB ~ 60dB	Over Current, Over Temperature
LM337KCSE3	Texas Instruments	Last Time Buy	1.5A	-40V	-1.2V to -37V	TO-220-3	0°C ~ 125°C	77dB	Over Temperature, Short Circuit
LM337T/LF01	Texas Instruments	Active	1.5A	-40V	-1.2V to -37V	TO-220-3, Formed Leads	0°C ~ 125°C	77dB	Over Temperature, Short Circuit
LM337T/NOPB	Texas Instruments	Active	1.5A	-40V	-1.2V to -37V	TO-220-3	0°C ~ 125°C	77dB	Over Temperature, Short Circuit

Engineering Selection Recommendations

For Active Production: LM337TG (onsemi) and LM337T/NOPB (Texas Instruments) are preferred selections. Both maintain active product status, meet all electrical and mechanical requirements, and provide improved PSRR performance (77dB) compared to the obsolete LM337T (60dB). LM337TG offers direct manufacturer continuity from onsemi with enhanced protection features.

For Extended Temperature Range: LM337BTG extends the operating temperature range to -40°C ~ 125°C, suitable for applications requiring lower temperature operation beyond the standard 0°C minimum.

For RoHS3 Compliance: LM337TG, LM337BTG, LM337SP, LM337KCSE3, LM337T/LF01, and LM337T/NOPB all carry RoHS3 compliance certification. The original LM337T does not specify RoHS3 status.

For Alternative Manufacturer Sourcing: LM337SP (STMicroelectronics) provides an active alternative from a different manufacturer while maintaining identical electrical specifications and TO-220-3 packaging.

For Last-Time-Buy Scenarios: LM337KCSE3 (Texas Instruments) carries Last Time Buy status and should be evaluated only when active alternatives are unavailable or when existing inventory management requires transition planning.

For Surface Mount Compatibility: LM337T/LF01 includes formed leads (LF01 suffix) for surface mount applications, though it retains TO-220-3 package classification.

Frequently Asked Questions (FAQ)

Q: Can LM337TG directly replace LM337T without circuit modifications?

A: Yes. LM337TG maintains identical electrical specifications, output current (1.5A), voltage ranges (-1.2V to -37V), and TO-220-3 package pinout. The primary differences are improved PSRR (77dB vs 60dB) and enhanced protection features, which are backward compatible.

Q: What is the difference between LM337TG and LM337BTG?

A: Both are onsemi products with identical electrical performance. LM337BTG extends the operating temperature range to -40°C ~ 125°C, compared to LM337TG's 0°C ~ 125°C. Select LM337BTG only if your application requires operation below 0°C.

Q: Is LM337T/NOPB suitable for new designs?

A: Yes. LM337T/NOPB (Texas Instruments) is active and meets all LM337T specifications. It is suitable for new designs and provides improved PSRR performance (77dB). The /NOPB suffix indicates lead-free, RoHS3 compliant packaging.

Q: Why is LM337KCSE3 marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this part. While currently available, it should not be selected for new designs. Use LM337T/NOPB or LM337TG instead.

Q: Can I use LM337SP (STMicroelectronics) as a substitute?

A: Yes. LM337SP meets all core electrical and mechanical requirements: 1.5A output, -40V maximum input, -1.2V to -37V output range, and TO-220-3 package. It is an active product from an alternative manufacturer.

Q: What does the LF01 suffix on LM337T/LF01 indicate?

A: LF01 indicates formed leads for surface mount applications. While the package remains TO-220-3, the leads are pre-formed for SMT assembly. This part is suitable for automated assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (LM337TG, LM337BTG, LM337SP, LM337T/LF01, LM337T/NOPB) carry RoHS3 compliance. The original LM337T does not specify RoHS3 status.

Q: Which substitute offers the best PSRR performance?

A: LM337TG, LM337BTG, LM337SP, LM337KCSE3, LM337T/LF01, and LM337T/NOPB all provide 77dB PSRR at 120Hz, compared to the original LM337T at 60dB. This represents improved power supply rejection ratio performance.

Q: Can I mix manufacturers in the same circuit board?

A: Yes. All listed substitutes maintain identical pinout, electrical specifications, and TO-220-3 package dimensions. Mixing manufacturers is permissible from an electrical and mechanical standpoint, though single-source procurement is recommended for production consistency.

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