LM337IMPX Linear Voltage Regulator IC Negative Adjustable

Part Overview

The LM337IMPX is a linear voltage regulator IC designed for negative adjustable output applications. It delivers 1.5A output current in a surface mount SOT-223-4 package. The device features over-temperature and short-circuit protection, making it suitable for power management applications requiring negative voltage regulation.

The main part number LM337IMPX carries a Last Time Buy product status, indicating limited availability. Equivalent and substitute part numbers provide alternative sourcing options with varying compliance certifications and inventory levels.

Key Parameters

Parameter	Specification
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	60dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4
Base Product Number	LM337
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LM337IMPX is determined by strict parametric equivalence across all electrical and mechanical specifications. The following criteria establish valid substitutes:

Mandatory Matching Parameters:

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: 60dB (120Hz)
Protection Features: Over Temperature, Short Circuit
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount
Package / Case: TO-261-4, TO-261AA
Supplier Device Package: SOT-223-4
Base Product Number: LM337
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute part numbers meet these parametric requirements and are manufactured by Texas Instruments. Variations in product status, RoHS compliance, and REACH classification do not affect electrical or mechanical compatibility.

Parameter Comparison

Parameter	LM337IMPX	LM337IMP	LM337IMP/NOPB	LM337IMPX/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Negative	Negative	Negative	Negative
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	-40V	-40V	-40V	-40V
Voltage - Output (Min/Fixed)	-1.2V	-1.2V	-1.2V	-1.2V
Voltage - Output (Max)	-37V	-37V	-37V	-37V
Current - Output	1.5A	1.5A	1.5A	1.5A
PSRR	60dB (120Hz)	60dB (120Hz)	60dB (120Hz)	60dB (120Hz)
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Temperature, Short Circuit
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-4	SOT-223-4	SOT-223-4	SOT-223-4
Product Status	Last Time Buy	Last Time Buy	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Affected	REACH Unaffected	REACH Unaffected
Inventory (Pcs)	1597	1205	21037	15219

Engineering Selection Recommendations

All four part numbers are parametrically equivalent and electrically interchangeable. Selection should be based on product status and compliance requirements:

LM337IMP/NOPB and LM337IMPX/NOPB carry Active product status with ROHS3 compliance and REACH Unaffected classification, providing long-term availability and regulatory alignment for new designs.

LM337IMPX and LM337IMP are designated Last Time Buy with RoHS non-compliance and REACH Affected status, suitable only for legacy system maintenance or applications where compliance certifications are not required.

Inventory levels vary across part numbers, with LM337IMP/NOPB offering the highest stock position at 21,037 pieces.

Frequently Asked Questions (FAQ)

Q: Can LM337IMP/NOPB be used as a direct replacement for LM337IMPX?

A: Yes. Both parts are parametrically equivalent across all electrical and mechanical specifications. The primary differences are product status and compliance certifications. LM337IMP/NOPB is Active with ROHS3 compliance, while LM337IMPX is Last Time Buy with RoHS non-compliance.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB designation indicates lead-free plating and RoHS3 compliance. Parts without this suffix use standard plating and do not meet RoHS3 requirements.

Q: Are all substitute parts in the same package?

A: Yes. All four part numbers use the SOT-223-4 supplier device package with TO-261-4 and TO-261AA case options. PCB footprints and mechanical mounting are identical.

Q: Which part number should be selected for new designs?

A: LM337IMP/NOPB or LM337IMPX/NOPB are recommended for new designs due to Active product status and ROHS3 compliance. These parts ensure long-term availability and regulatory alignment.

Q: Do compliance differences affect circuit performance?

A: No. RoHS and REACH classifications do not alter electrical performance, output voltage range, current capacity, or protection features. All parts deliver identical functional performance.

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