LM2574M-3.3 Equivalent & Substitute Parts

Part Overview

The LM2574M-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. This component operates across a 4V to 40V input range and is housed in a 14-SOIC surface mount package.

The LM2574M-3.3 carries an obsolete product status. Identifying equivalent and 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

LM2574M-3.3

Texas InstrumentsIn Stock: 5130LM2574M-3.3 Datasheet

Current PartRFQ

LM2574M-3.3/NOPB

Texas InstrumentsIn Stock: 3572LM2574M-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2574M-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Output Current Capacity: Must be rated for 500mA minimum
• Input Voltage Range: Must accommodate 4V to 40V operation
• Package Configuration: Must be 14-SOIC (0.295", 7.50mm Width) for PCB compatibility
• Topology: Must be buck (step-down) switching regulator
• Switching Frequency: Must operate at 52kHz
• Operating Temperature Range: Must support -40°C to 125°C (TJ)

The LM2574M-3.3/NOPB qualifies as a direct substitute, sharing identical electrical specifications and package footprint while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LM2574M-3.3/NOPB is the direct substitute for the obsolete LM2574M-3.3. Both components are manufactured by Texas Instruments and share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility.

The primary distinction is product lifecycle status: the LM2574M-3.3/NOPB maintains active manufacturing status, providing assured long-term availability and supply chain stability. Additionally, the LM2574M-3.3/NOPB meets ROHS3 compliance requirements, whereas the original part is RoHS non-compliant. This compliance difference is significant for applications subject to environmental regulations.

The moisture sensitivity level differs between the two parts (2A versus 3), reflecting different manufacturing and packaging processes. The LM2574M-3.3/NOPB offers extended moisture protection (168 hours at MSL 3 versus 4 weeks at MSL 2A), which may provide advantages in humid storage and handling environments.

Frequently Asked Questions (FAQ)

Q: Can the LM2574M-3.3/NOPB be used as a direct replacement for the LM2574M-3.3?

A: Yes. Both parts are electrically and mechanically identical. The LM2574M-3.3/NOPB is the active production equivalent and provides pin-for-pin compatibility with identical output voltage (3.3V), output current (500mA), input voltage range (4V to 40V), switching frequency (52kHz), and 14-SOIC package footprint.

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

A: The "/NOPB" designation indicates "No Plumbum" (lead-free) packaging, reflecting RoHS3 compliance. This suffix distinguishes the part from legacy versions and confirms adherence to current environmental standards.

Q: Are there any PCB layout considerations when substituting these parts?

A: No. Both parts use the identical 14-SOIC (0.295", 7.50mm Width) package, ensuring footprint compatibility without PCB redesign. Existing PCB layouts designed for the LM2574M-3.3 will accommodate the LM2574M-3.3/NOPB without modification.

Q: How do the moisture sensitivity levels affect component handling?

A: The LM2574M-3.3/NOPB (MSL 3, 168 hours) provides extended moisture protection compared to the LM2574M-3.3 (MSL 2A, 4 weeks). This means the substitute part can tolerate longer exposure to humid conditions before requiring baking. For standard manufacturing environments with proper moisture control, this difference has minimal practical impact.

Q: Is the LM2574M-3.3/NOPB suitable for new designs?

A: Yes. The LM2574M-3.3/NOPB is the recommended choice for new designs. It maintains active product status, ensures long-term availability, and meets current RoHS3 compliance requirements. The original LM2574M-3.3 is obsolete and should not be specified for new applications.