LM2575BT Equivalent & Substitute Parts

Part Overview

The LM2575BT is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion applications. It delivers positive adjustable output from 1.23V to 37V with 1A output current capability in a TO-220-5 through-hole package. The device operates across a 4V to 40V input range with a fixed switching frequency of 52kHz and supports operating temperatures from -40°C to 125°C.

The LM2575BT carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications currently using this component.

Substiute Parts

LM2575BT

Microchip TechnologyIn Stock: 11345LM2575BT Datasheet

Current PartRFQ

LM2575WT

Microchip TechnologyIn Stock: 5852LM2575WT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575BT is determined by strict equivalence across the following critical parameters:

• Identical buck topology and step-down function
• Matching output configuration (positive adjustable)
• Identical input voltage range (4V to 40V minimum and maximum)
• Identical output voltage range (1.23V to 37V minimum and maximum)
• Identical output current rating (1A)
• Identical switching frequency (52kHz)
• Identical operating temperature range (-40°C to 125°C)
• Identical package and pinout (TO-220-5 through-hole)
• Same base product number (LM2575)

The LM2575WT meets all substitution criteria as a direct equivalent from the same manufacturer with identical electrical specifications and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM2575WT is a direct functional and mechanical equivalent to the LM2575BT. Both devices share identical electrical specifications, pinout, and package configuration, enabling direct substitution in existing designs.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The LM2575BT is obsolete, while the LM2575WT maintains active product status with ROHS3 compliance. For new designs or ongoing production requiring regulatory compliance with modern environmental standards, the LM2575WT is the appropriate selection. For legacy system maintenance where RoHS non-compliant components are acceptable, either part functions identically within the specified electrical and thermal parameters.

Frequently Asked Questions (FAQ)

Q: Can the LM2575WT replace the LM2575BT in existing applications?

A: Yes. The LM2575WT is electrically and mechanically identical to the LM2575BT. Both devices operate with the same input/output voltage ranges, output current, switching frequency, and temperature specifications. The TO-220-5 package pinout is identical, enabling direct PCB substitution without circuit modification.

Q: What is the difference between LM2575BT and LM2575WT?

A: The LM2575BT is obsolete, while the LM2575WT is an active product. The LM2575WT is ROHS3 compliant, whereas the LM2575BT is RoHS non-compliant. All electrical and thermal specifications are identical.

Q: Are there packaging differences between these parts?

A: Both parts use the TO-220-5 through-hole package. The LM2575BT is supplied in standard packaging, while the LM2575WT is supplied in tube packaging. This difference does not affect electrical performance or mechanical compatibility on the PCB.

Q: What parameters must match for a valid substitute?

A: Valid substitutes must maintain identical buck topology, output configuration (positive adjustable), input voltage range (4V to 40V), output voltage range (1.23V to 37V), output current (1A), switching frequency (52kHz), operating temperature range (-40°C to 125°C), and TO-220-5 package configuration.

Q: Can I use these parts in new designs?

A: The LM2575WT is recommended for new designs due to its active product status and ROHS3 compliance. The LM2575BT, being obsolete, is not recommended for new development.