LM337KCE3 Equivalent & Substitute Parts

Part Overview

The LM337KCE3 is a linear voltage regulator IC from Texas Instruments designed for negative adjustable output applications. It delivers 1.5A output current in a TO-220-3 through-hole package and operates across an input voltage range of -40V maximum with adjustable output from -1.2V to -37V. The device includes over-temperature and short-circuit protection features.

The LM337KCE3 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM337KCE3 are classified based on strict electrical and mechanical parameter alignment:

Manufacturer Recommended Substitutes maintain identical electrical specifications and package configuration. These parts are direct replacements with equivalent performance characteristics.

Parametric Equivalents share core electrical parameters (output configuration, voltage range, current rating, protection features) but may differ in manufacturer, product status, or compliance certifications. These parts are functionally equivalent for circuit operation.

Key Parameters for Substitution:

Output Configuration: Negative
Output Type: Adjustable
Voltage Range: -40V input maximum, -1.2V to -37V output
Current Rating: 1.5A
Package: TO-220-3 through-hole
Protection: Over Temperature and Short Circuit

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Config	Voltage Input (Max)	Voltage Output (Min/Max)	Current Output	PSRR (120Hz)	Operating Temp	Package	RoHS Status
LM337KCE3	Texas Instruments	Obsolete	Negative	-40V	-1.2V / -37V	1.5A	77dB	0°C ~ 125°C	TO-220-3	Non-compliant
LM337KCSE3	Texas Instruments	Last Time Buy	Negative	-40V	-1.2V / -37V	1.5A	77dB	0°C ~ 125°C	TO-220-3	ROHS3 Compliant
LM337T/NOPB	Texas Instruments	Active	Negative	-40V	-1.2V / -37V	1.5A	77dB	0°C ~ 125°C	TO-220-3	ROHS3 Compliant
LM337T	onsemi	Obsolete	Negative	-40V	-1.2V / -37V	1.5A	60dB	0°C ~ 125°C	TO-220-3	Not specified
LM337T/LF01	Texas Instruments	Active	Negative	-40V	-1.2V / -37V	1.5A	77dB	0°C ~ 125°C	TO-220-3, Formed Leads	ROHS3 Compliant
LM337BTG	onsemi	Active	Negative	-40V	-1.2V / -37V	1.5A	77dB	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
LM337SP	STMicroelectronics	Active	Negative	40V	-1.2V / -37V	1.5A	77dB ~ 60dB	0°C ~ 125°C	TO-220-3	ROHS3 Compliant
LM337TG	onsemi	Active	Negative	-40V	-1.2V / -37V	1.5A	77dB	0°C ~ 125°C	TO-220-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LM337T/NOPB

The LM337T/NOPB from Texas Instruments is the preferred substitute. It maintains active product status, carries ROHS3 compliance certification, and delivers identical electrical performance to the LM337KCE3. This part is currently in production with substantial inventory availability (5242 pcs).

Secondary Recommendation: LM337BTG or LM337TG

Both onsemi variants (LM337BTG and LM337TG) are active products with ROHS3 compliance and equivalent electrical specifications. The LM337BTG extends the operating temperature range to -40°C ~ 125°C, providing broader thermal coverage. The LM337TG offers the highest inventory availability (25300 pcs) among all substitutes.

Alternative: LM337T/LF01

The LM337T/LF01 from Texas Instruments is an active product with ROHS3 compliance. This variant features formed leads and surface-mount compatibility, suitable for applications requiring modified lead geometry. Note that REACH status is listed as affected for this variant.

Not Recommended for New Designs: LM337KCSE3 and LM337T (onsemi)

The LM337KCSE3 carries Last Time Buy status, indicating discontinued production. The onsemi LM337T is obsolete and exhibits lower PSRR performance (60dB versus 77dB), making it unsuitable for noise-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can LM337T/NOPB directly replace LM337KCE3 in existing designs?

A: Yes. The LM337T/NOPB maintains identical electrical specifications, package configuration, and pin assignment. No circuit modifications are required for direct substitution.

Q: What is the difference between LM337BTG and LM337TG?

A: Both are onsemi products with equivalent electrical performance. The LM337BTG specifies operating temperature range of -40°C ~ 125°C, while LM337TG operates from 0°C ~ 125°C. Select LM337BTG for applications requiring extended low-temperature operation.

Q: Why does LM337SP show different input voltage specification?

A: The LM337SP from STMicroelectronics lists maximum input voltage as 40V (positive notation) rather than -40V. This represents the same absolute voltage magnitude for negative supply applications. Electrical performance remains equivalent for the specified negative output configuration.

Q: Is LM337T/LF01 suitable for through-hole PCB assembly?

A: The LM337T/LF01 features formed leads designed for surface-mount or modified through-hole applications. Standard through-hole assembly equipment may require lead-forming adjustments. Verify PCB pad configuration compatibility before selection.

Q: What is the inventory status for active substitutes?

A: LM337T/NOPB (5242 pcs), LM337BTG (1269 pcs), LM337SP (1750 pcs), and LM337TG (25300 pcs) are currently in stock. LM337TG offers the highest availability for immediate procurement.

Q: Are all recommended substitutes RoHS compliant?

A: All active substitutes (LM337T/NOPB, LM337BTG, LM337SP, LM337TG, and LM337T/LF01) carry ROHS3 compliance certification. The original LM337KCE3 is RoHS non-compliant.

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