MIC4575BU Equivalent & Substitute Parts

Part Overview

The MIC4575BU is a Buck, Buck-Boost Switching Regulator IC from Microchip Technology, designed for positive adjustable output applications. This device integrates step-down and step-up/step-down topology capabilities in a single package, delivering 1.7A switch current with adjustable output voltage ranging from 1.23V to 20V. The MIC4575BU operates across a 4V to 24V input range at 200kHz switching frequency.

The MIC4575BU carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

MIC4575BU

Microchip TechnologyIn Stock: 2060MIC4575BU Datasheet

Current PartRFQ

MIC4575WU

Microchip TechnologyIn Stock: 1437MIC4575WU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MIC4575BU is determined by strict equivalence across the following critical parameters:

• Topology and Function: Buck and Buck-Boost switching regulator capability
• Output Configuration: Positive adjustable output
• Electrical Specifications: Input voltage range 4V to 24V, output voltage adjustable 1.23V to 20V, 1.7A switch current, 200kHz switching frequency
• Package Compatibility: TO-263-6 D2PAK (5 Leads + Tab) surface mount package
• Operating Temperature Range: -40°C to 85°C
• Synchronous Rectifier: Non-synchronous design

The MIC4575WU meets all these criteria and shares the identical base product number (MIC4575), confirming functional and electrical equivalence.

Parameter Comparison

Engineering Selection Recommendations

The MIC4575WU is the direct substitute for the obsolete MIC4575BU. Both devices share identical electrical specifications, topology, output configuration, and package format. The MIC4575WU carries Active product status, ensuring ongoing availability and supply chain continuity.

The MIC4575WU holds ROHS3 compliance certification, whereas the MIC4575BU is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulatory requirements. Both devices maintain identical MSL ratings and operating temperature ranges.

Selection of the MIC4575WU is appropriate for direct replacement in existing designs without circuit modification, provided that RoHS compliance requirements are compatible with the application.

Frequently Asked Questions (FAQ)

Q: Can the MIC4575WU directly replace the MIC4575BU in existing designs?

A: Yes. The MIC4575WU is electrically and functionally equivalent to the MIC4575BU. Both devices feature identical input voltage range (4V to 24V), adjustable output voltage (1.23V to 20V), output current (1.7A), switching frequency (200kHz), and package format (TO-263-6 D2PAK). No circuit modifications are required for substitution.

Q: What is the primary difference between these two parts?

A: The MIC4575BU is Obsolete, while the MIC4575WU is Active. Additionally, the MIC4575WU is ROHS3 compliant, whereas the MIC4575BU is RoHS non-compliant. All electrical and mechanical specifications remain identical.

Q: Are the package dimensions identical?

A: Yes. Both the MIC4575BU and MIC4575WU use the TO-263-6 D2PAK (5 Leads + Tab) surface mount package with identical pinout and footprint. The supplier device package designation is TO-263-5 for both parts.

Q: What is the MSL rating for these devices?

A: Both the MIC4575BU and MIC4575WU carry MSL Level 3 with a 168-hour floor life rating. Moisture sensitivity handling procedures must be followed during storage and assembly.

Q: Are there any temperature range differences?

A: No. Both devices operate across the identical temperature range of -40°C to 85°C (TA).