LM2575HVT-3.3 Equivalent & Substitute Parts

Part Overview

The LM2575HVT-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. This component delivers a fixed 3.3V output at 1A from input voltages ranging from 4V to 60V, operating across the industrial temperature range of -40°C to 125°C. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core electrical specifications while offering improved product status, RoHS compliance, and alternative sourcing options.

Substiute Parts

LM2575HVT-3.3

Texas InstrumentsIn Stock: 2184LM2575HVT-3.3 Datasheet

Current PartRFQ

LM2575HVT-3.3/LF03

Texas InstrumentsIn Stock: 955LM2575HVT-3.3/LF03 Datasheet

DirectRFQ

LM2575HVT-3.3/NOPB

National SemiconductorIn Stock: 6363LM2575HVT-3.3/NOPB Datasheet

DirectRFQ

LM2575-3.3WT

Microchip TechnologyIn Stock: 5277LM2575-3.3WT Datasheet

MFR RecommendedRFQ

LM2575T-3.3G

onsemiIn Stock: 1543LM2575T-3.3G Datasheet

MFR RecommendedRFQ

LM2576-3.3WT

Microchip TechnologyIn Stock: 4132LM2576-3.3WT Datasheet

MFR RecommendedRFQ

LM2576T-3.3G

onsemiIn Stock: 3270LM2576T-3.3G Datasheet

MFR RecommendedRFQ

MIC4575-3.3WT

Microchip TechnologyIn Stock: 4220MIC4575-3.3WT Datasheet

MFR RecommendedRFQ

MIC4576-3.3WT

Microchip TechnologyIn Stock: 3727MIC4576-3.3WT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2575HVT-3.3 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Output voltage: 3.3V fixed
• Output current: 1A minimum
• Package: TO-220-5 through-hole
• Switching frequency: 52kHz
• Operating temperature range: -40°C to 125°C
• Input voltage compatibility: minimum 4V input support

Substitution Categories:

Direct Equivalents (1A Output): Parts maintaining identical output current specifications (1A) with matching electrical characteristics. These include LM2575HVT-3.3/LF03, LM2575HVT-3.3/NOPB, LM2575-3.3WT, LM2575T-3.3G, and MIC4575-3.3WT. All operate at 52kHz switching frequency with TO-220-5 packaging.

Higher Current Alternatives (3A Output): Parts with increased output current capability (3A) that can substitute in applications where the original 1A specification is not a limiting factor. These include LM2576-3.3WT, LM2576T-3.3G, and MIC4576-3.3WT. These parts maintain the same output voltage, package, and temperature range while providing additional current headroom.

Compatibility Constraints: Input voltage maximum ratings vary across substitutes. The original LM2575HVT-3.3 supports 60V maximum input; some substitutes limit this to 40V. Switching frequency remains constant at 52kHz across all direct equivalents. Operating temperature specifications are consistent across all recommended substitutes.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (1A Applications):

LM2575HVT-3.3/LF03 from Texas Instruments is the primary direct equivalent. It maintains all electrical specifications of the original part while offering active product status and ROHS3 compliance. This part is recommended when the original design parameters must be preserved without modification.

LM2575HVT-3.3/NOPB from National Semiconductor provides an alternative direct equivalent with active status. Both parts support the full 60V input voltage range of the original design.

LM2575-3.3WT from Microchip Technology and LM2575T-3.3G from onsemi are active, ROHS3-compliant direct equivalents. These parts reduce the maximum input voltage to 40V, requiring verification that the application does not exceed this limit.

For Higher Current Applications (3A Capability):

LM2576-3.3WT from Microchip Technology is an active, ROHS3-compliant option providing 3A output current in the same TO-220-5 package. This part maintains 52kHz switching frequency and full temperature range operation. It is suitable for applications requiring current headroom beyond the original 1A specification.

LM2576T-3.3G from onsemi provides 3A output capability with ROHS3 compliance, though it carries obsolete product status. This part is not recommended for new designs.

For Specialized Applications:

MIC4575-3.3WT from Microchip Technology offers buck-boost topology with 1.7A switch current and higher switching frequency (200kHz). This part operates at reduced maximum input voltage (24V) and reduced operating temperature range (-40°C to 85°C). Selection requires confirmation that application parameters fall within these constraints.

MIC4576-3.3WT from Microchip Technology provides 3A output with buck topology and 200kHz switching frequency. Maximum input voltage is 36V with operating temperature limited to -40°C to 85°C. This part is suitable only when these parameter restrictions are acceptable.

Compliance Considerations:

All recommended active substitutes carry ROHS3 compliance certification, addressing regulatory requirements that the original obsolete part does not meet. Product status should be verified against design lifecycle requirements; active parts are preferred for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can LM2575-3.3WT replace LM2575HVT-3.3 in all applications?

A: LM2575-3.3WT is electrically equivalent for 1A output applications. However, it limits maximum input voltage to 40V compared to the original part's 60V specification. Verify that your application input voltage does not exceed 40V before substitution.

Q: What is the difference between 1A and 3A output versions?

A: The 1A versions (LM2575 series) and 3A versions (LM2576 series) maintain identical output voltage (3.3V fixed), package (TO-220-5), and switching frequency (52kHz). The 3A versions provide higher output current capability. A 3A part can substitute for a 1A requirement, but not vice versa. Verify that your circuit design accommodates the different current ratings.

Q: Why do some substitutes have lower maximum input voltage?

A: Different manufacturers optimize their designs for specific input voltage ranges. Microchip and onsemi versions limit maximum input to 40V, while Texas Instruments versions support 60V. Confirm your application's input voltage specification before selecting a substitute with reduced maximum rating.

Q: Is MIC4575-3.3WT a suitable replacement?

A: MIC4575-3.3WT differs significantly from the original part. It operates at 200kHz switching frequency (versus 52kHz), supports only 24V maximum input voltage, and limits operating temperature to -40°C to 85°C. This part is suitable only if your application parameters fall within these constraints. The higher switching frequency may require circuit redesign.

Q: What does ROHS3 compliance mean for my design?

A: ROHS3 compliance certifies that the part meets Restriction of Hazardous Substances regulations. All recommended active substitutes carry this certification, while the original obsolete part does not. If your design must meet regulatory requirements, select only ROHS3-compliant parts.

Q: Can I use LM2576T-3.3G even though it is obsolete?

A: LM2576T-3.3G carries obsolete product status, indicating it is no longer in active production. While it may be available from inventory, it is not recommended for new designs or long-term production. Select active alternatives such as LM2576-3.3WT instead.

Q: What is the difference between TO-220-5 and TO-220-5 Formed Leads?

A: TO-220-5 Formed Leads indicates that the component leads have been pre-formed for direct insertion into PCB holes. Standard TO-220-5 packaging may require lead forming during assembly. Both are mechanically compatible with TO-220-5 footprints; verify your assembly process requirements.

Q: Are all substitutes pin-compatible with the original part?

A: All recommended substitutes use TO-220-5 packaging with identical pin configuration. They are mechanically and electrically pin-compatible with the original LM2575HVT-3.3. No PCB redesign is required for package compatibility.