LM2575WU Equivalent & Substitute Parts

Part Overview

The LM2575WU is an active buck switching regulator IC manufactured by Microchip Technology, designed for step-down voltage conversion applications. This surface-mount component delivers 1A output current with adjustable positive output voltage ranging from 1.23V to 37V, operating from a 4V to 40V input supply. The device operates at a fixed switching frequency of 52kHz and is housed in a TO-263-6 D2PAK package with 5 leads plus tab. Substitute parts are necessary when addressing supply chain constraints, inventory availability, or when design requirements permit operation with alternative topologies or higher output current capabilities.

Substiute Parts

LM2575WU

Microchip TechnologyIn Stock: 2194LM2575WU Datasheet

Current PartRFQ

LM2596DSADJR4G

onsemiIn Stock: 19062LM2596DSADJR4G Datasheet

MFR RecommendedRFQ

TL2575-ADJIKTTR

Texas InstrumentsIn Stock: 1414TL2575-ADJIKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-ADJIKTTR

Texas InstrumentsIn Stock: 1404TL2575HV-ADJIKTTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575WU is determined by the following critical parameters: identical package footprint (TO-263-6 D2PAK), compatible output voltage range (minimum 1.23V, maximum at least 37V), input voltage range compatibility (minimum 4V, maximum at least 40V), and output current capability (minimum 1A). The LM2575WU operates exclusively in buck topology with positive output configuration.

Three substitute parts meet these criteria:

LM2596DSADJR4G (onsemi): Supports buck, boost, and buck-boost topologies with 3A output current, exceeding the 1A requirement. Input range 4.5V to 40V and output range 1.23V to 37V are compatible. Identical package and positive/negative output configuration flexibility.

TL2575-ADJIKTTR (Texas Instruments): Buck topology with 1A output current, matching the original specification. Input range 4.75V to 40V and output range 1.23V to 37V are compatible. Identical package and positive output configuration.

TL2575HV-ADJIKTTR (Texas Instruments): Buck topology with 1A output current. Extended input range 4.75V to 60V and output range 1.23V to 57V provide broader voltage headroom. Identical package and positive output configuration.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the LM2575WU. All devices are active products with established supply chains.

LM2596DSADJR4G provides the highest output current capability at 3A and operates at 150kHz switching frequency, enabling smaller external component sizing. The multi-topology support (buck, boost, buck-boost) offers design flexibility beyond the original buck-only configuration. Moisture sensitivity level MSL-1 provides superior storage and handling characteristics compared to MSL-3.

TL2575-ADJIKTTR maintains electrical specifications identical to the LM2575WU with matching 1A output current and 52kHz switching frequency. Input voltage minimum is slightly elevated at 4.75V versus 4V. This part provides direct functional equivalence with Texas Instruments manufacturing.

TL2575HV-ADJIKTTR extends input voltage range to 60V maximum and output voltage range to 57V maximum, accommodating higher voltage system designs. Switching frequency and output current remain matched to the original specification. This variant is appropriate for applications requiring extended voltage headroom.

Frequently Asked Questions (FAQ)

Q: Can LM2596DSADJR4G replace LM2575WU in all applications?

A: LM2596DSADJR4G is electrically compatible for buck topology applications requiring 1A or less output current. The higher 3A rating and 150kHz switching frequency are backward compatible. Multi-topology capability does not affect buck-only designs. Verify PCB layout accommodates the identical TO-263-6 D2PAK footprint.

Q: What is the minimum input voltage difference between substitutes?

A: LM2575WU operates from 4V minimum input. TL2575-ADJIKTTR and TL2575HV-ADJIKTTR require 4.75V minimum input. LM2596DSADJR4G requires 4.5V minimum input. Applications operating below 4.5V input voltage cannot use any substitute without design modification.

Q: Are the output voltage ranges identical across all parts?

A: LM2575WU, LM2596DSADJR4G, and TL2575-ADJIKTTR share identical output ranges of 1.23V to 37V. TL2575HV-ADJIKTTR extends the maximum output voltage to 57V, enabling higher voltage output designs.

Q: How does switching frequency affect component selection?

A: LM2575WU, TL2575-ADJIKTTR, and TL2575HV-ADJIKTTR operate at 52kHz. LM2596DSADJR4G operates at 150kHz. Higher switching frequency reduces external inductor and capacitor sizes but increases switching losses. Existing PCB designs using 52kHz components are compatible with TL2575 variants without modification.

Q: What is the significance of MSL rating differences?

A: LM2575WU and TL2575 variants carry MSL-3 (168 hours maximum storage at 85°C/85% RH). LM2596DSADJR4G carries MSL-1 (unlimited storage). MSL-1 provides superior shelf life and reduced risk of moisture-induced failures during extended storage or in humid environments.

Q: Are all substitutes available in identical packaging?

A: All four parts use TO-263-6 D2PAK (5 Leads + Tab) package with identical footprint and pinout. PCB layout compatibility is assured across all substitutes.