LM337KC Linear Voltage Regulator IC Negative Adjustable 1.5A TO-220-3

Part Overview

The LM337KC is a linear voltage regulator IC manufactured by Texas Instruments, designed for negative adjustable output applications with 1.5A current capability in a TO-220-3 package. This device provides negative voltage regulation with adjustable output from -1.2V to -37V and includes over-temperature and short-circuit protection features.

The LM337KC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM337KC
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Negative
Output Type	Adjustable
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
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LM337KC are qualified based on the following critical parameters that determine functional equivalence:

Core Electrical Parameters:

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

Regulatory & Compliance Parameters:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Substitute parts are grouped into three categories: Direct Manufacturer Substitutes (same part number variants), MFR Recommended Substitutes (active alternatives from the same or equivalent manufacturers), and Parametric Equivalents (parts meeting all electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Output Config	Voltage Input (Max)	Voltage Output Range	Current Output	PSRR (120Hz)	Package	Product Status	Operating Temp
LM337KC	Texas Instruments	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3	Obsolete	0°C ~ 125°C
LM337KCSE3	Texas Instruments	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3	Last Time Buy	0°C ~ 125°C
LM337T/NOPB	Texas Instruments	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3	Active	0°C ~ 125°C
LM337T	onsemi	Negative	-40V	-1.2V to -37V	1.5A	60dB	TO-220-3	Obsolete	0°C ~ 125°C
LM337T/LF01	Texas Instruments	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3, Formed Leads	Active	0°C ~ 125°C
LM337BTG	onsemi	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3	Active	-40°C ~ 125°C
LM337SP	STMicroelectronics	Negative	40V	-1.2V to -37V	1.5A	77dB ~ 60dB	TO-220-3	Active	0°C ~ 125°C
LM337TG	onsemi	Negative	-40V	-1.2V to -37V	1.5A	77dB	TO-220-3	Active	0°C ~ 125°C

Engineering Selection Recommendations

Primary Recommendation: LM337T/NOPB (Texas Instruments)

LM337T/NOPB is the manufacturer-recommended substitute for LM337KC. This part maintains identical electrical specifications, including 77dB PSRR at 120Hz, and carries Active product status with 5242 units in stock. It is ROHS3 compliant and REACH unaffected, ensuring regulatory compliance for new designs and production continuity.

Secondary Recommendations:

LM337TG (onsemi) and LM337BTG (onsemi) are active alternatives with full electrical equivalence. Both provide extended operating temperature range (-40°C ~ 125°C versus 0°C ~ 125°C for the original part) and maintain 77dB PSRR performance. LM337TG offers the highest inventory availability at 25,300 units.

LM337T/LF01 (Texas Instruments) is an active alternative with formed leads for surface-mount applications. This variant is suitable for designs requiring modified lead geometry while maintaining electrical equivalence.

Considerations for Obsolete Status:

LM337KC and LM337T (onsemi) are both classified as obsolete. For new designs or long-term production requirements, selection should prioritize active-status alternatives: LM337T/NOPB, LM337TG, LM337BTG, or LM337SP.

LM337SP (STMicroelectronics) is an active alternative with equivalent electrical performance. Note that the input voltage specification differs slightly (40V versus -40V in documentation); verify against application requirements.

Frequently Asked Questions (FAQ)

Q: Can LM337T/NOPB directly replace LM337KC without circuit modifications?

A: Yes. LM337T/NOPB maintains identical electrical specifications, package type (TO-220-3), and pin configuration. No circuit modifications are required for direct substitution.

Q: What is the difference between LM337KC and LM337KCSE3?

A: Both parts are electrically identical. LM337KCSE3 is packaged in tubes and carries Last Time Buy status, indicating limited future availability. LM337KC is the standard variant. For new procurement, LM337T/NOPB is recommended.

Q: Why do some substitutes show different PSRR values?

A: PSRR (Power Supply Rejection Ratio) varies by manufacturer and production process. LM337T (onsemi) specifies 60dB at 120Hz, while Texas Instruments variants specify 77dB. Both values meet typical application requirements for negative voltage regulation. Verify PSRR requirements against your specific circuit design.

Q: Is LM337T/LF01 suitable for through-hole mounting applications?

A: LM337T/LF01 features formed leads (LF01 designation) designed for surface-mount or modified lead geometry applications. For standard through-hole PCB mounting, LM337T/NOPB, LM337TG, or LM337BTG are more appropriate.

Q: What is the inventory status for active substitutes?

A: LM337TG (onsemi) has the highest availability at 25,300 units. LM337T/NOPB (Texas Instruments) has 5,242 units in stock. LM337SP (STMicroelectronics) has 1,750 units. LM337BTG (onsemi) has 1,269 units. Verify current inventory with your supplier before final part selection.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All recommended substitutes carry ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for applications requiring these certifications.

Q: What is the operating temperature range difference between LM337KC and LM337BTG?

A: LM337KC operates from 0°C to 125°C. LM337BTG extends the lower operating limit to -40°C, providing wider temperature range capability. Select based on your application's thermal requirements.

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