LM2574MX-3.3 Equivalent & Substitute Parts

Part Overview

The LM2574MX-3.3 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 3.3V output and 500mA current capacity. The device operates across a 4V to 40V input range with a 52kHz switching frequency and is housed in a 14-SOIC surface mount package.

The LM2574MX-3.3 carries an obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and access components with active manufacturing support and current compliance certifications.

Substiute Parts

LM2574MX-3.3

Texas InstrumentsIn Stock: 5179LM2574MX-3.3 Datasheet

Current PartRFQ

LM2574MX-3.3/NOPB

Texas InstrumentsIn Stock: 3116LM2574MX-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2574MX-3.3 is determined by strict equivalence across the following electrical and mechanical parameters:

• Fixed output voltage of 3.3V
• Output current rating of 500mA
• Input voltage range of 4V to 40V minimum and maximum
• Buck topology with positive output configuration
• Single output configuration
• 52kHz switching frequency
• Non-synchronous rectifier design
• Operating temperature range of -40°C to 125°C
• 14-SOIC surface mount package with 0.295" (7.50mm) width
• Base product number LM2574

The LM2574MX-3.3/NOPB qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction lies in product status, packaging format, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LM2574MX-3.3/NOPB is the direct substitute for the obsolete LM2574MX-3.3. Both devices are manufactured by Texas Instruments and share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility.

The LM2574MX-3.3/NOPB offers the following advantages for new designs and production continuity:

• Active product status with ongoing manufacturing support
• ROHS3 compliance, meeting current environmental and regulatory requirements
• Availability in Cut Tape and Digi-Reel® packaging formats, supporting both prototype and high-volume production workflows
• Identical electrical performance across all critical parameters

Selection of the LM2574MX-3.3/NOPB eliminates obsolescence risk and ensures compliance with modern procurement and environmental standards while maintaining full functional equivalence.

Frequently Asked Questions (FAQ)

Q: Are the LM2574MX-3.3 and LM2574MX-3.3/NOPB pin-for-pin compatible?

A: Yes. Both devices use the 14-SOIC package with identical pinout, electrical specifications, and functional behavior. Direct PCB substitution is possible without circuit modification.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix designates the part as lead-free (No Plumbum/No Lead) and indicates packaging in Cut Tape and Digi-Reel® formats. This is a manufacturer designation for packaging and lead-free compliance, not a functional difference.

Q: Can the LM2574MX-3.3/NOPB be used in applications originally designed for the LM2574MX-3.3?

A: Yes. The LM2574MX-3.3/NOPB is a direct functional equivalent with identical electrical performance, input/output voltage specifications, current ratings, and operating temperature range. No circuit redesign is required.

Q: What is the significance of the product status change from Obsolete to Active?

A: Active product status ensures continued manufacturing, technical support, and supply chain availability. The LM2574MX-3.3/NOPB eliminates obsolescence risk and provides long-term design security.

Q: Does ROHS3 compliance affect electrical performance?

A: No. ROHS3 compliance is a material and manufacturing standard that does not alter electrical specifications, performance characteristics, or functional behavior. The device operates identically to the non-compliant version.

Q: Are there packaging differences between the two parts?

A: The LM2574MX-3.3/NOPB is available in Cut Tape and Digi-Reel® packaging formats, supporting both prototype quantities and high-volume production. The original LM2574MX-3.3 packaging format is not specified in the provided data. Both use the same 14-SOIC physical package.