MIC4575BU TR Equivalent & Substitute Parts

Part Overview

The MIC4575BU TR is a Buck, Buck-Boost Switching Regulator IC manufactured by Microchip Technology, designed for positive adjustable output applications. This device integrates step-down and step-up/step-down functionality in a single package, delivering 1.7A switch current with adjustable output voltage from 1.23V to 20V across an input range of 4V to 24V. The MIC4575BU TR is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

MIC4575BU TR

Microchip TechnologyIn Stock: 950MIC4575BU TR Datasheet

Current PartRFQ

MIC4575WU-TR

Microchip TechnologyIn Stock: 1246MIC4575WU-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Topology: Buck, Buck-Boost configuration
• Output Configuration: Positive adjustable output
• Voltage Specifications: Input 4V–24V, Output 1.23V–20V adjustable
• Current Rating: 1.7A switch current
• Switching Frequency: 200kHz
• Package: TO-263-6, D2PAK (5 Leads + Tab)
• Operating Temperature Range: -40°C ~ 85°C

The MIC4575WU TR meets all electrical and mechanical parameters required for direct substitution. Both devices share identical functional specifications, package geometry, and pin configuration, enabling pin-for-pin replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

The MIC4575WU TR is the direct substitute for the obsolete MIC4575BU TR. Both devices are manufactured by Microchip Technology and provide identical electrical performance and mechanical compatibility. The primary distinction is product status and regulatory compliance: the MIC4575WU TR is active in production and ROHS3 compliant, whereas the MIC4575BU TR is obsolete and RoHS non-compliant. For new designs or production continuity, the MIC4575WU TR is the appropriate selection. Both devices maintain equivalent moisture sensitivity classification and share identical thermal operating ranges.

Frequently Asked Questions (FAQ)

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

A: Yes. The MIC4575WU TR is a direct pin-for-pin substitute with identical electrical specifications, output voltage range, current rating, switching frequency, and package configuration. No circuit modifications are required.

Q: What is the difference between MIC4575BU TR and MIC4575WU TR?

A: The devices are electrically and mechanically equivalent. The MIC4575WU TR is the active production variant with ROHS3 compliance, while the MIC4575BU TR is obsolete and RoHS non-compliant. Both maintain the same functional performance and package footprint.

Q: Are the packages identical?

A: Yes. Both devices use the TO-263-6, D2PAK (5 Leads + Tab) package with identical pin configuration and PCB footprint, enabling direct board-level substitution.

Q: What is the moisture sensitivity level for these devices?

A: Both the MIC4575BU TR and MIC4575WU TR are classified as MSL 3, with a floor life of 168 hours at 30°C/60% RH.

Q: Can these devices operate across the full -40°C to 85°C temperature range?

A: Yes. Both devices are rated for continuous operation across the -40°C to 85°C ambient temperature range.