LM2575MX-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2575MX-ADJ is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. This positive adjustable step-down regulator delivers 1A output current with an adjustable output voltage range from 1.23V to 37V, operating from a 4V to 40V input supply. The device is housed in a 24-SOIC surface mount package with a switching frequency of 52kHz.

The LM2575MX-ADJ is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.

Substiute Parts

LM2575MX-ADJ

Texas InstrumentsIn Stock: 1021LM2575MX-ADJ Datasheet

Current PartRFQ

LM2575MX-ADJ/NOPB

Texas InstrumentsIn Stock: 875LM2575MX-ADJ/NOPB Datasheet

DirectRFQ

LM2575YWM

Microchip TechnologyIn Stock: 3730LM2575YWM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2575MX-ADJ are identified based on electrical and mechanical parameter equivalence. The substitution criteria are strictly limited to the following parameters:

• Topology & Function: Buck (step-down) topology with positive adjustable output
• Electrical Specifications: Input voltage range (4V to 40V), output voltage range (1.23V to 37V), output current (1A), and switching frequency (52kHz)
• Output Configuration: Single positive adjustable output
• Thermal Operating Range: -40°C to 125°C junction temperature
• Package Compatibility: 24-SOIC surface mount package with 0.295" (7.50mm) width
• Synchronous Rectifier: Non-synchronous topology

Parts meeting all these criteria are classified as direct electrical and mechanical equivalents. Variations in product status, RoHS compliance, packaging format (Tape & Reel versus Tube), and moisture sensitivity level do not affect functional substitutability within the specified electrical and thermal parameters.

Parameter Comparison

Engineering Selection Recommendations

LM2575MX-ADJ/NOPB (Texas Instruments)

The LM2575MX-ADJ/NOPB is the direct successor to the LM2575MX-ADJ from the same manufacturer. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The /NOPB suffix indicates lead-free plating, aligning with modern manufacturing standards. This part is the primary recommendation for direct replacement in new designs and production continuity.

LM2575YWM (Microchip Technology)

The LM2575YWM is a cross-manufacturer equivalent manufactured by Microchip Technology. All electrical parameters, thermal specifications, and package dimensions are identical to the LM2575MX-ADJ. This part carries active product status and ROHS3 compliance. The LM2575YWM features improved moisture sensitivity level (MSL 2 versus MSL 3), providing extended shelf life and reduced moisture-related handling requirements. This part is suitable for applications where supply diversification across manufacturers is required or where improved moisture sensitivity characteristics are beneficial.

Both substitute parts are electrically and mechanically interchangeable with the LM2575MX-ADJ within the specified operating parameters. Selection between them depends on supply chain strategy, manufacturer preference, and packaging format requirements (Tape & Reel versus Tube).

Frequently Asked Questions (FAQ)

Q: Are the LM2575MX-ADJ/NOPB and LM2575YWM electrically identical to the LM2575MX-ADJ?

A: Yes. Both substitute parts maintain identical electrical specifications across all critical parameters: input voltage range (4V to 40V), adjustable output voltage range (1.23V to 37V), output current (1A), switching frequency (52kHz), and operating temperature range (-40°C to 125°C). They are direct functional equivalents.

Q: Can I use the LM2575YWM as a drop-in replacement for the LM2575MX-ADJ?

A: Yes. The LM2575YWM is pin-compatible and functionally equivalent. It operates identically within the same electrical and thermal parameters and uses the same 24-SOIC package. The primary difference is the manufacturer (Microchip Technology versus Texas Instruments) and improved moisture sensitivity characteristics.

Q: What is the significance of the /NOPB suffix on the LM2575MX-ADJ/NOPB?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) plating. This designation reflects compliance with lead-free manufacturing standards and RoHS3 requirements. The electrical and functional performance remains identical to the original LM2575MX-ADJ.

Q: Why is the LM2575MX-ADJ marked as obsolete?

A: The LM2575MX-ADJ has been superseded by the LM2575MX-ADJ/NOPB, which offers the same functionality with improved compliance status and lead-free construction. Obsolescence does not affect the part's technical performance but indicates that new designs should transition to the active successor part.

Q: Does the difference in packaging format (Tape & Reel versus Tube) affect substitutability?

A: No. Packaging format differences do not affect electrical or mechanical compatibility. The choice between Tape & Reel and Tube packaging is determined by assembly process requirements and handling preferences, not by functional substitutability.

Q: What is the difference in Moisture Sensitivity Level (MSL) between the parts?

A: The LM2575MX-ADJ and LM2575MX-ADJ/NOPB are rated MSL 3 (168 hours), while the LM2575YWM is rated MSL 2 (1 year). MSL 2 provides extended shelf life and reduced moisture-related handling constraints. This difference does not affect electrical performance but influences storage and handling procedures.

Q: Are all three parts RoHS compliant?

A: The LM2575MX-ADJ is RoHS non-compliant. Both the LM2575MX-ADJ/NOPB and LM2575YWM are ROHS3 compliant. For applications requiring RoHS compliance, either substitute part is required.

Q: Can I mix these parts in the same production batch?

A: Yes. All three parts are electrically and mechanically equivalent and can be used interchangeably within the same circuit design. However, supply chain and quality documentation practices should account for manufacturer and part number differences.