LM2575M-12/NOPB Equivalent & Substitute Parts

Part Overview

The LM2575M-12/NOPB is a buck switching regulator IC manufactured by Texas Instruments, designed for positive fixed 12V output applications with 1A current capacity. This device operates as a step-down converter with a fixed output topology in a 24-SOIC surface mount package. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

LM2575M-12/NOPB

Texas InstrumentsIn Stock: 1033LM2575M-12/NOPB Datasheet

Current PartRFQ

LM2575-12YWM-TR

Microchip TechnologyIn Stock: 1010LM2575-12YWM-TR Datasheet

DirectRFQ

LM2574N-12G

onsemiIn Stock: 1379LM2574N-12G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2575M-12/NOPB are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Output voltage: 12V fixed
• Output current capability: minimum 1A (or higher)
• Input voltage range: 4V to 40V minimum
• Switching frequency: 52kHz
• Topology: Buck (step-down) configuration
• Operating temperature range: -40°C to 125°C
• RoHS3 compliance
• Output configuration: Positive fixed

Substitute Categories:

Direct Equivalent (Same Package, Same Specifications): LM2575-12YWM-TR by Microchip Technology maintains identical electrical specifications and operates in the same 24-SOIC package with surface mount technology. This part is active and provides direct pin-for-pin compatibility.

Functional Equivalent (Different Package, Reduced Current): LM2574N-12G by onsemi provides the same 12V fixed output voltage and 52kHz switching frequency but with reduced output current (500mA versus 1A) and operates in an 8-DIP through-hole package. This part is active and offers expanded topology flexibility (buck, boost, buck-boost) but requires circuit board redesign due to package change.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended for Obsolete Part Mitigation):

Select LM2575-12YWM-TR when maintaining existing PCB designs and surface mount assembly processes. This part is active with confirmed inventory availability and provides identical electrical performance and package compatibility. The transition from Texas Instruments to Microchip Technology maintains ROHS3 compliance and REACH unaffected status. Tape & Reel packaging supports automated assembly workflows.

For Design Flexibility with Current Derating:

Select LM2574N-12G when circuit redesign is acceptable and reduced output current (500mA) meets application requirements. This part is active and offers expanded topology options (buck, boost, buck-boost configurations). Through-hole mounting requires PCB layout modification and manual or selective soldering processes. The minimum input voltage increases to 4.75V, which may impact low-input-voltage applications.

Compliance Considerations:

All three parts maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for electronics manufacturing. The obsolete status of the main part necessitates transition planning; both substitute parts are active and support long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can LM2575-12YWM-TR replace LM2575M-12/NOPB without PCB modifications?

A: Yes. LM2575-12YWM-TR is a direct equivalent with identical pin configuration, package dimensions (24-SOIC), and electrical specifications. No PCB layout changes are required. Both parts are surface mount devices with the same footprint.

Q: What are the limitations of using LM2574N-12G as a substitute?

A: LM2574N-12G has two key differences: output current is reduced to 500mA (versus 1A), and the package is 8-DIP through-hole instead of 24-SOIC surface mount. Applications requiring full 1A output cannot use this part. PCB redesign is necessary due to different pin count and mounting technology.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LM2575-12YWM-TR and LM2574N-12G are both ROHS3 compliant and REACH unaffected, matching the compliance profile of the main part.

Q: What is the minimum input voltage for each part?

A: LM2575M-12/NOPB and LM2575-12YWM-TR both accept 4V minimum input. LM2574N-12G requires 4.75V minimum input, which may affect applications with lower input voltage sources.

Q: Which substitute part supports the widest range of topologies?

A: LM2574N-12G supports step-up, step-down, and step-up/step-down (buck-boost) configurations. LM2575M-12/NOPB and LM2575-12YWM-TR are limited to step-down (buck) topology only.

Q: What is the switching frequency for all parts?

A: All three parts operate at 52kHz switching frequency, ensuring consistent EMI characteristics and filter design across substitutions.

Q: Can LM2574N-12G output positive or negative voltage?

A: LM2574N-12G supports positive or negative fixed output configuration. For this application, it is configured for positive 12V output, matching the main part specification.