LM337KCSE3 Equivalent & Substitute Parts

Part Overview

The LM337KCSE3 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 is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring negative voltage regulation with adjustable output levels.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM337KCSE3
Category	Power Management (PMIC)
Output Configuration	Negative
Output Type	Adjustable
Current - Output	1.5A
Voltage - Input (Max)	-40V
Voltage - Output (Min/Fixed)	-1.2V
Voltage - Output (Max)	-37V
PSRR	77dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LM337KCSE3 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Output Configuration: Negative
Output Type: Adjustable
Current - Output: 1.5A
Voltage - Input (Max): -40V
Voltage - Output Range: -1.2V to -37V
PSRR: 77dB (120Hz) or equivalent
Protection Features: Over Temperature, Short Circuit
Operating Temperature: 0°C ~ 125°C minimum

Package Considerations:

TO-220-3 through-hole mounting (primary)
TO-252-3 surface mount (alternative for different assembly methods)

All listed substitutes maintain electrical equivalence across these parameters while differing in packaging, product status, or manufacturer designation.

Parameter Comparison

Part Number	Manufacturer	Output Config	Current (A)	Voltage Input (Max)	Voltage Output Range	PSRR (dB)	Package	Mounting Type	Product Status
LM337KCSE3	Texas Instruments	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-220-3	Through Hole	Last Time Buy
LM337KVURG3	Texas Instruments	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-252-3	Surface Mount	Last Time Buy
LM337T/NOPB	Texas Instruments	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-220-3	Through Hole	Active
LM337T	onsemi	Negative	1.5	-40V	-1.2V to -37V	60 (120Hz)	TO-220-3	Through Hole	Obsolete
LM337T/LF01	Texas Instruments	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-220-3	Surface Mount	Active
LM337BTG	onsemi	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-220-3	Through Hole	Active
LM337SP	STMicroelectronics	Negative	1.5	-40V	-1.2V to -37V	77-60 (120Hz)	TO-220-3	Through Hole	Active
LM337TG	onsemi	Negative	1.5	-40V	-1.2V to -37V	77 (120Hz)	TO-220-3	Through Hole	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

LM337T/NOPB (Texas Instruments) is the preferred direct substitute. It maintains identical electrical specifications, TO-220-3 through-hole packaging, and active product status with unlimited moisture sensitivity rating, ensuring long-term availability and supply chain stability.

LM337BTG (onsemi) and LM337TG (onsemi) are functionally equivalent alternatives with active status. Both provide identical electrical performance and through-hole mounting. These options expand sourcing flexibility across multiple manufacturers.

LM337SP (STMicroelectronics) offers equivalent performance with active status and through-hole mounting, providing additional supply chain diversity.

Surface Mount Alternative:

LM337KVURG3 (Texas Instruments) provides electrical equivalence in TO-252-3 surface mount packaging for designs requiring SMD assembly. It maintains Last Time Buy status matching the original part.

LM337T/LF01 (Texas Instruments) offers TO-220-3 with formed leads for surface mount applications and active status, though REACH status differs from the original part.

Avoid:

LM337T (onsemi) is classified as Obsolete and should not be selected for new designs despite parametric equivalence.

Frequently Asked Questions (FAQ)

Q: Can LM337KVURG3 replace LM337KCSE3 directly on the PCB?

A: No. LM337KVURG3 uses TO-252-3 surface mount packaging versus the TO-220-3 through-hole package of LM337KCSE3. PCB layout and assembly method must be redesigned. Electrical performance is equivalent.

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

A: Both are Texas Instruments LM337 variants with identical electrical specifications. LM337T/NOPB uses standard TO-220-3 through-hole leads. LM337T/LF01 features formed leads for surface mount applications. LM337T/NOPB is recommended for through-hole designs.

Q: Why is LM337T (onsemi) listed if it is Obsolete?

A: LM337T is included for reference as a parametric equivalent. However, Obsolete status indicates discontinued production and limited availability. Active alternatives such as LM337T/NOPB, LM337BTG, or LM337TG are recommended for new designs.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitutes are RoHS3 compliant except LM337T (onsemi), which does not specify RoHS status. Compliance verification is required for applications with RoHS requirements.

Q: What is the significance of PSRR differences between parts?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject power supply noise. LM337KCSE3 and most substitutes specify 77dB at 120Hz. LM337T (onsemi) specifies 60dB, indicating lower noise rejection capability. For noise-sensitive applications, select parts with 77dB PSRR.

Q: Can I use LM337SP from STMicroelectronics as a drop-in replacement?

A: Yes. LM337SP provides electrical equivalence, TO-220-3 through-hole packaging, and active product status. It is a direct mechanical and electrical substitute suitable for through-hole PCB designs.

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