LM2574MX-12 Equivalent & Substitute Parts

Part Overview

The LM2574MX-12 is a buck switching regulator IC from Texas Instruments' SIMPLE SWITCHER® series, designed for step-down voltage conversion with a fixed 12V output. This device delivers 500mA output current and operates across a 4V to 40V input range, making it suitable for industrial and consumer power management applications.

The LM2574MX-12 is classified as obsolete. Locating direct equivalents becomes necessary for ongoing production support, maintenance, and new design implementations where this specific part number is required or preferred.

Substiute Parts

LM2574MX-12

Texas InstrumentsIn Stock: 5572LM2574MX-12 Datasheet

Current PartRFQ

LM2574MX-12/NOPB

Texas InstrumentsIn Stock: 3316LM2574MX-12/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2574MX-12 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 12V
• Output Current Capability: Must be 500mA or greater
• Input Voltage Range: Must accommodate 4V to 40V
• Topology: Must be buck (step-down) configuration
• Package: Must be 14-SOIC (0.295", 7.50mm Width)
• Switching Frequency: Must be 52kHz
• Manufacturer: Texas Instruments (same series)

The LM2574MX-12/NOPB qualifies as a direct substitute because it maintains identical electrical specifications and package configuration while differing only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The LM2574MX-12/NOPB is the direct functional equivalent of the LM2574MX-12. Both devices share identical electrical performance characteristics and physical package specifications.

Selection between these parts should be based on:

Product Status: The LM2574MX-12/NOPB carries Active status, ensuring ongoing manufacturer support and availability. The original LM2574MX-12 is Obsolete, limiting future procurement options.

Regulatory Compliance: The LM2574MX-12/NOPB meets RoHS3 compliance requirements, while the LM2574MX-12 does not. For applications subject to RoHS directives or customer specifications requiring RoHS compliance, the LM2574MX-12/NOPB is the appropriate selection.

Packaging Format: The LM2574MX-12/NOPB is supplied in Tape & Reel format, suitable for automated assembly processes. The original part is supplied in bulk packaging. Packaging selection depends on production volume and assembly methodology.

Frequently Asked Questions (FAQ)

Q: Can the LM2574MX-12/NOPB be used as a direct replacement for the LM2574MX-12?

A: Yes. Both parts are electrically and mechanically identical. They deliver the same 12V output at 500mA, operate across the same 4V to 40V input range, and use the same 14-SOIC package. The primary differences are product status and RoHS compliance.

Q: What is the significance of the "/NOPB" suffix?

A: The "/NOPB" designation indicates the part is supplied in Tape & Reel packaging without lead (Pb-free). This is the standard modern packaging format for this device and reflects RoHS3 compliance.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts operate at 52kHz switching frequency, deliver 500mA output current, and maintain the same -40°C to 125°C operating temperature range. Electrical performance is identical.

Q: Why is the original LM2574MX-12 marked as Obsolete?

A: The LM2574MX-12 represents an earlier production variant. Texas Instruments has transitioned to the LM2574MX-12/NOPB as the current active product, which includes RoHS3 compliance and modern packaging standards.

Q: Can I use these parts interchangeably in existing designs?

A: Yes, for PCB assembly and electrical function. Both parts fit the same 14-SOIC footprint and deliver identical performance. If your design was originally qualified with the LM2574MX-12, the LM2574MX-12/NOPB will function identically. Verify that your procurement and compliance requirements align with the RoHS status of your selected variant.

Q: What should I consider when transitioning from LM2574MX-12 to LM2574MX-12/NOPB?

A: Verify RoHS compliance requirements for your application and customer specifications. Confirm that your assembly process supports Tape & Reel packaging if transitioning from bulk supply. Electrical and thermal performance remain unchanged, requiring no circuit redesign.