LM25574MTX Equivalent & Substitute Parts

Part Overview

The LM25574MTX is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with positive adjustable output. It delivers 500mA output current across an input voltage range of 6V to 42V, with adjustable output voltage from 1.225V to 40V. The device operates at switching frequencies between 50kHz and 1MHz and is housed in a 16-TSSOP surface mount package.

The LM25574MTX carries an obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this regulator.

Substiute Parts

LM25574MTX

Texas InstrumentsIn Stock: 14446LM25574MTX Datasheet

Current PartRFQ

LM25574MTX/NOPB

Texas InstrumentsIn Stock: 2478LM25574MTX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM25574MTX is determined by strict equivalence across the following critical parameters:

• Function and topology (step-down buck converter)
• Output configuration (positive adjustable)
• Electrical specifications (input voltage range 6V–42V, output voltage 1.225V–40V, 500mA output current)
• Switching frequency range (50kHz–1MHz)
• Package type (16-TSSOP surface mount)
• Operating temperature range (-40°C to 125°C)
• Absence of synchronous rectification

The LM25574MTX/NOPB is identified as a direct substitute based on identical electrical and mechanical parameters. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM25574MTX/NOPB is the direct substitute for the LM25574MTX. Both parts are electrically and mechanically identical across all specified parameters. The LM25574MTX/NOPB is preferred for new designs and ongoing production due to its active product status and ROHS3 compliance certification. The original LM25574MTX is obsolete and should be replaced in active supply chains.

For applications currently using the LM25574MTX, transition to LM25574MTX/NOPB requires no circuit redesign, as pin configuration, electrical performance, and package dimensions are identical. The NOPB suffix indicates lead-free plating and RoHS3 compliance, meeting current environmental and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can LM25574MTX/NOPB be used as a direct replacement for LM25574MTX?

A: Yes. Both parts are electrically and mechanically identical. The LM25574MTX/NOPB is the active production equivalent with improved compliance status.

Q: What does the NOPB suffix indicate?

A: NOPB denotes "No Plumbum" (lead-free) and indicates RoHS3 compliance. The part uses lead-free solder plating and meets current environmental regulations.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the 16-TSSOP (0.173", 4.40mm Width) surface mount package with identical pinout and mechanical dimensions.

Q: Why is the original LM25574MTX marked as obsolete?

A: The LM25574MTX has been superseded by the LM25574MTX/NOPB, which offers RoHS3 compliance and active production support. Texas Instruments has transitioned to the lead-free variant.

Q: What is the inventory status for these parts?

A: LM25574MTX has 14,400 pcs in stock (new original). LM25574MTX/NOPB has 2,429 pcs in stock (new original, cut tape and Digi-Reel packaging available).

Q: Are there any electrical performance differences between the two parts?

A: No. Input voltage range (6V–42V), output voltage range (1.225V–40V), output current (500mA), switching frequency (50kHz–1MHz), and operating temperature range (-40°C to 125°C) are identical.