LM337IMP Linear Voltage Regulator IC Negative Adjustable

Part Overview

The LM337IMP 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 main part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications requiring this negative adjustable regulator topology.

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	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

Substitute Part Grouping Explanation

Substitute parts for the LM337IMP are identified based on strict parametric equivalence across the following criteria:

Output Configuration and Type: Both substitutes maintain negative adjustable output topology, ensuring functional compatibility with existing circuit designs.

Electrical Specifications: Input voltage range (-40V max), output voltage range (-1.2V to -37V), and output current (1.5A) are identical across all variants.

Package and Mounting: All parts use SOT-223-4 surface mount packaging with TO-261-4 and TO-261AA case designations, ensuring mechanical and thermal compatibility.

Protection and Performance: Over temperature and short circuit protection, along with 60dB PSRR at 120Hz, are maintained across all variants.

Operating Temperature Range: All parts operate across -40°C to 125°C, supporting identical thermal specifications.

The substitutes LM337IMP/NOPB and LM337IMPX/NOPB are parametrically equivalent to the main part LM337IMP, differing only in product status and compliance certifications.

Parameter Comparison

Parameter	LM337IMP	LM337IMP/NOPB	LM337IMPX/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Configuration	Negative	Negative	Negative
Output Type	Adjustable	Adjustable	Adjustable
Voltage - Input (Max)	-40V	-40V	-40V
Voltage - Output (Min/Fixed)	-1.2V	-1.2V	-1.2V
Voltage - Output (Max)	-37V	-37V	-37V
Current - Output	1.5A	1.5A	1.5A
PSRR	60dB (120Hz)	60dB (120Hz)	60dB (120Hz)
Protection Features	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
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	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
Product Status	Last Time Buy	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Affected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For new designs or ongoing production requiring negative adjustable linear regulation at 1.5A, LM337IMP/NOPB or LM337IMPX/NOPB are the appropriate selections. Both substitutes are in Active product status with full availability, eliminating supply discontinuity risk associated with the Last Time Buy status of LM337IMP.

LM337IMP/NOPB and LM337IMPX/NOPB both achieve ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The original LM337IMP carries RoHS non-compliance and REACH affected designations, making it unsuitable for applications subject to environmental or procurement restrictions.

All three variants maintain identical electrical performance and package specifications, ensuring direct functional substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can LM337IMP/NOPB directly replace LM337IMP in existing designs?

A: Yes. Both parts are parametrically equivalent across all electrical specifications, output configuration, current rating, voltage ranges, protection features, and SOT-223-4 packaging. No circuit modifications are required.

Q: What is the difference between LM337IMP/NOPB and LM337IMPX/NOPB?

A: Both are parametrically equivalent with identical electrical performance and packaging. The difference lies in product status and compliance certifications. Both are Active status with ROHS3 compliance and REACH unaffected designation. Selection between them depends on supplier availability and inventory requirements.

Q: Why is the original LM337IMP in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production. Existing inventory is available for a limited time. For continued supply, transition to LM337IMP/NOPB or LM337IMPX/NOPB.

Q: Are there any thermal or mechanical differences between these variants?

A: No. All three parts use identical SOT-223-4 surface mount packaging with TO-261-4 and TO-261AA case designations. Thermal characteristics and mounting requirements are identical.

Q: Do the substitutes meet current regulatory requirements?

A: LM337IMP/NOPB and LM337IMPX/NOPB are ROHS3 compliant and REACH unaffected. The original LM337IMP is RoHS non-compliant and REACH affected. For applications subject to environmental regulations, use the compliant substitutes.

Q: What inventory levels are available for each variant?

A: LM337IMP has 1205 pieces in stock. LM337IMP/NOPB has 21037 pieces in stock. LM337IMPX/NOPB has 15219 pieces in stock. Substitute variants offer significantly higher availability.

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