LM337T Linear Voltage Regulator IC Negative Adjustable 1.5A TO-220-3

Part Overview

The LM337T is a linear voltage regulator IC manufactured by Texas Instruments, designed for negative adjustable output applications with 1.5A current capacity in a TO-220-3 package. This device operates as a single-output negative adjustable regulator with integrated over-temperature and short-circuit protection. The main part number LM337T carries a Last Time Buy product status, indicating limited availability. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Negative
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	-40V
Voltage - Output (Min/Fixed)	-1.2V
Voltage - Output (Max)	-37V
Current - Output	1.5A
PSRR	77dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Base Product Number	LM337

Substitute Part Grouping Explanation

Substitute parts for the LM337T are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Output Configuration: Negative
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): -40V
Voltage - Output (Min/Fixed): -1.2V
Voltage - Output (Max): -37V
Current - Output: 1.5A
Package / Case: TO-220-3
Base Product Number: LM337

Substitution Categories:

Direct Manufacturer Substitutes (Texas Instruments): Parts that maintain identical electrical specifications and package configuration with variations in lead formation or RoHS compliance status.

Parametric Equivalents (Texas Instruments): Parts sharing the same base product number and electrical performance characteristics but with different product status classifications.

Manufacturer Recommended Substitutes (onsemi, STMicroelectronics, Analog Devices Inc.): Cross-manufacturer alternatives that meet or exceed the electrical and mechanical requirements of the main part, with equivalent or enhanced protection features and compliance certifications.

Parameter Comparison

Parameter	LM337T	LM337T/LF01	LM337T/NOPB	LM337KCSE3	LM337BTG	LM337SP	LM337TG	LT337AT#PBF
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	STMicroelectronics	onsemi	Analog Devices Inc.
Output Configuration	Negative	Negative	Negative	Negative	Negative	Negative	Negative	Negative
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	-40V	-40V	-40V	-40V	-40V	40V	-40V	40V
Voltage - Output (Min/Fixed)	-1.2V	-1.2V	-1.2V	-1.2V	-1.2V	-1.2V	-1.2V	-1.2V
Voltage - Output (Max)	-37V	-37V	-37V	-37V	-37V	-37V	-37V	-37V
Current - Output	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A	1.5A
PSRR	77dB (120Hz)	77dB (120Hz)	77dB (120Hz)	77dB (120Hz)	77dB (120Hz)	77dB ~ 60dB (120Hz)	77dB (120Hz)	80dB ~ 66dB (120Hz)
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Over Voltage
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3, Formed Leads	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Last Time Buy	Active	Active	Active	Active

Engineering Selection Recommendations

For Active Production and New Designs:

LM337T/NOPB (Texas Instruments) is the primary recommended substitute. This part maintains identical electrical specifications and through-hole mounting configuration while offering ROHS3 compliance and active product status. With 5242 units in stock, it provides immediate availability and long-term supply continuity.

LM337TG (onsemi) represents an alternative from a secondary manufacturer with equivalent electrical performance, active product status, and the highest inventory level (25300 units). This part extends the operating temperature range to -40°C ~ 125°C and includes over-current protection, providing enhanced thermal coverage.

For RoHS3 Compliance Requirements:

All substitute parts except the main LM337T meet ROHS3 compliance standards. LM337T/NOPB, LM337T/LF01, LM337KCSE3, LM337BTG, LM337SP, LM337TG, and LT337AT#PBF are suitable for applications requiring RoHS3 certification.

For Extended Temperature Range Applications:

LM337BTG (onsemi) and LM337TG (onsemi) support operating temperatures from -40°C to 125°C, compared to the standard 0°C to 125°C range of the main part. These options are appropriate for industrial and automotive environments requiring wider temperature specifications.

For Enhanced Protection Features:

LT337AT#PBF (Analog Devices Inc.) provides the most comprehensive protection with over-current, over-temperature, and over-voltage protection. This part also offers superior PSRR performance (80dB ~ 66dB) and is suitable for noise-sensitive applications.

For Surface Mount Applications:

LM337T/LF01 (Texas Instruments) is the only substitute offering surface-mount configuration with formed leads, enabling automated assembly processes while maintaining electrical equivalence.

Frequently Asked Questions (FAQ)

Q: Can LM337T/NOPB be used as a direct replacement for LM337T in existing designs?

A: Yes. LM337T/NOPB maintains identical electrical specifications, output configuration, voltage ranges, current capacity, and TO-220-3 package configuration. The primary differences are ROHS3 compliance and active product status. Through-hole mounting compatibility is preserved.

Q: What is the difference between LM337T/LF01 and LM337T/NOPB?

A: LM337T/LF01 features surface-mount configuration with formed leads, while LM337T/NOPB uses standard through-hole mounting. Electrical specifications are identical. LM337T/LF01 is suitable for automated assembly processes; LM337T/NOPB is appropriate for manual or wave-soldering applications.

Q: Are cross-manufacturer substitutes (onsemi, STMicroelectronics, Analog Devices Inc.) electrically equivalent?

A: Yes. LM337BTG, LM337SP, LM337TG, and LT337AT#PBF meet or exceed the electrical requirements of LM337T. All maintain negative adjustable output configuration, 1.5A current capacity, and TO-220-3 package compatibility. Some variants offer enhanced protection features or extended temperature ranges.

Q: Why does LM337SP list input voltage as 40V instead of -40V?

A: This represents a documentation variation in the provided specifications. The part functions as a negative regulator and is electrically compatible with LM337T based on all other electrical parameters and functional description.

Q: Which substitute offers the best long-term availability?

A: LM337TG (onsemi) has the highest inventory level at 25300 units and active product status, providing the strongest supply continuity. LM337T/NOPB (Texas Instruments) offers 5242 units with active status as an alternative.

Q: Can LM337KCSE3 be used for new production?

A: LM337KCSE3 carries Last Time Buy status, indicating limited availability. While electrically equivalent to LM337T, it is not recommended for new production designs. LM337T/NOPB or LM337TG are preferred alternatives with active product status.

Q: What are the compliance differences between substitute parts?

A: All substitute parts are ROHS3 compliant. LM337T/NOPB has REACH Unaffected status, while LM337T/LF01 is REACH Affected. All parts share EAR99 ECCN classification and 8542.39.0001 HTSUS code. Verify specific compliance requirements for your application and region.

Q: Is the LT337AT#PBF from Analog Devices Inc. a suitable alternative?

A: Yes. LT337AT#PBF is electrically compatible with enhanced specifications including superior PSRR performance (80dB ~ 66dB) and comprehensive protection features (over-current, over-temperature, over-voltage). It is suitable for noise-sensitive applications and carries active product status with ROHS3 compliance.

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