LM2574HVM-ADJ Buck Switching Regulator IC

Part Overview

The LM2574HVM-ADJ is a buck switching regulator IC from the SIMPLE SWITCHER® series, designed for positive adjustable output applications. This device operates as a step-down converter with a fixed switching frequency of 52kHz and supports output currents up to 500mA. The main part number is currently listed as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

LM2574HVM-ADJ

Texas InstrumentsIn Stock: 2853LM2574HVM-ADJ Datasheet

Current PartRFQ

LM2574HVM-ADJ/NOPB

National SemiconductorIn Stock: 2866LM2574HVM-ADJ/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2574HVM-ADJ is determined by strict equivalence across the following critical parameters:

• Input voltage range: 4V to 60V
• Output voltage adjustability: 1.23V to 37V
• Output current capability: 500mA
• Switching frequency: 52kHz
• Package type: 14-SOIC (0.295", 7.50mm Width)
• Operating temperature range: -40°C to 125°C
• Topology: Buck (step-down)
• Output configuration: Positive adjustable
• Synchronous rectifier: Not present

The LM2574HVM-ADJ/NOPB variant qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status: the base LM2574HVM-ADJ is obsolete, while the /NOPB variant remains active.

Parameter Comparison

Engineering Selection Recommendations

The LM2574HVM-ADJ/NOPB is the direct equivalent for the obsolete LM2574HVM-ADJ. Both devices share identical electrical and mechanical specifications, including input/output voltage ranges, current rating, switching frequency, and package configuration. The /NOPB variant is currently in active production status with confirmed inventory availability (2800 pcs), whereas the base part number is obsolete.

For new designs or ongoing procurement, the LM2574HVM-ADJ/NOPB should be specified. For existing designs using the obsolete LM2574HVM-ADJ, direct substitution with the /NOPB variant requires no circuit modifications or re-qualification, as all functional and physical parameters remain identical.

Frequently Asked Questions (FAQ)

Q: Can the LM2574HVM-ADJ/NOPB be used as a direct replacement for LM2574HVM-ADJ?

A: Yes. Both parts are electrically and mechanically identical. The /NOPB designation indicates lead-free compliance and active production status. No design changes are required for substitution.

Q: What does the /NOPB suffix mean?

A: NOPB stands for "No Plumbum" (no lead), indicating RoHS compliance for the lead-free variant. This is a manufacturing and compliance designation, not a functional difference.

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

A: No. Both devices use the 14-SOIC (0.295", 7.50mm Width) package with identical pinout and footprint. PCB layouts and component placement require no modification.

Q: Why is the original LM2574HVM-ADJ listed as obsolete?

A: The base part number has been superseded by the /NOPB variant to meet RoHS and lead-free manufacturing requirements. The functional performance remains unchanged.

Q: What are the critical parameters for substitution compatibility?

A: Input voltage range (4V–60V), output voltage adjustability (1.23V–37V), output current (500mA), switching frequency (52kHz), package type (14-SOIC), and operating temperature range (-40°C to 125°C) must all match exactly for valid substitution.