LM2575-3.3BN Equivalent & Substitute Parts

Part Overview

The LM2575-3.3BN is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 3.3V output and 1A current capacity. This 16-DIP through-hole package device operates across a 4V to 40V input range with a 52kHz switching frequency. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support, maintenance, and new production requirements.

Substiute Parts

LM2575-3.3BN

Microchip TechnologyIn Stock: 3624LM2575-3.3BN Datasheet

Current PartRFQ

LM2575-3.3YN

Microchip TechnologyIn Stock: 895LM2575-3.3YN Datasheet

DirectRFQ

TL2575HV-33IN

Texas InstrumentsIn Stock: 1650TL2575HV-33IN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575-3.3BN is determined by strict alignment of the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Output Current: Must support minimum 1A
• Topology: Must be buck (step-down) configuration
• Package: Must be 16-DIP (0.300", 7.62mm) through-hole
• Switching Frequency: Must be 52kHz
• Output Configuration: Must be positive fixed output
• Number of Outputs: Must be single output
• Synchronous Rectifier: Must be non-synchronous

Two substitute parts meet these criteria: the LM2575-3.3YN from Microchip Technology and the TL2575HV-33IN from Texas Instruments. Both maintain identical functional specifications and package geometry, enabling direct board-level substitution.

Parameter Comparison

Engineering Selection Recommendations

LM2575-3.3YN is the direct equivalent from Microchip Technology. This part maintains identical electrical specifications and package configuration as the obsolete LM2575-3.3BN while offering active product status and ROHS3 compliance. Selection of this part provides continuity with the original design intent and manufacturer lineage.

TL2575HV-33IN from Texas Instruments is a cross-manufacturer substitute that meets all functional and package requirements. This part extends the maximum input voltage specification to 60V compared to the 40V limit of the Microchip variants, and raises the minimum input voltage to 4.75V. Both substitute parts carry ROHS3 compliance and active product status, supporting modern supply chain and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM2575-3.3YN be used as a direct replacement for the LM2575-3.3BN?

A: Yes. The LM2575-3.3YN is electrically and mechanically identical to the LM2575-3.3BN. Both parts share the same output voltage (3.3V), output current (1A), input voltage range (4V to 40V), switching frequency (52kHz), and 16-DIP package geometry. The primary difference is product status and compliance certification.

Q: What are the key differences between the Microchip and Texas Instruments substitutes?

A: Both parts maintain identical core functionality and package type. The TL2575HV-33IN extends the maximum input voltage specification to 60V and raises the minimum input voltage to 4.75V, compared to the LM2575-3.3YN specifications of 4V to 40V. Design circuits operating within the 4V to 40V input range are compatible with either part.

Q: Are there any board-level modifications required when substituting these parts?

A: No. All three parts use the identical 16-DIP (0.300", 7.62mm) through-hole package with matching pinout and functional specifications. Direct socket substitution is possible without PCB redesign.

Q: Which substitute part should be selected for new designs?

A: Both LM2575-3.3YN and TL2575HV-33IN are suitable for new designs. Selection depends on supply chain availability, input voltage requirements, and preferred manufacturer. Both parts carry active product status and ROHS3 compliance.

Q: Does the input voltage difference between substitutes affect circuit design?

A: The TL2575HV-33IN minimum input voltage of 4.75V versus 4V for the LM2575-3.3YN may impact designs operating near the lower voltage boundary. Verify your application's minimum input voltage requirement against the selected part's specification before implementation.