MIC4575BT Equivalent & Substitute Parts

Part Overview

The MIC4575BT 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 topology capabilities in a single TO-220-5 package, delivering 1.7A switch current with adjustable output voltage ranging from 1.23V to 20V across a 4V to 24V input range.

The MIC4575BT is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

MIC4575BT

Microchip TechnologyIn Stock: 1935MIC4575BT Datasheet

Current PartRFQ

MIC4575WT

Microchip TechnologyIn Stock: 7899MIC4575WT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MIC4575BT is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck and Buck-Boost switching regulator capability
• Output Configuration: Positive adjustable output
• Electrical Specifications: Input voltage range (4V–24V), output voltage range (1.23V–20V), output current (1.7A switch), switching frequency (200kHz)
• Package & Mounting: TO-220-5 through-hole package
• Operating Temperature Range: -40°C to 85°C

The MIC4575WT qualifies as a direct substitute based on identical electrical and mechanical parameters. The primary distinction is product status and compliance certification, not functional or electrical capability.

Parameter Comparison

Engineering Selection Recommendations

The MIC4575WT is the direct substitute for the MIC4575BT. Both devices share identical electrical specifications, functional topology, and mechanical packaging. Selection between these parts is determined by compliance and availability requirements:

MIC4575WT is preferred when:

• ROHS3 compliance is required for new designs or production batches
• Active product status and ongoing manufacturer support are necessary
• Standard tube packaging is acceptable for assembly processes

MIC4575BT may be retained only when:

• Existing inventory must be consumed in legacy applications
• RoHS non-compliance does not conflict with end-product requirements
• No regulatory or contractual compliance mandates apply

Both parts are electrically and mechanically interchangeable without circuit modification or PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can MIC4575WT directly replace MIC4575BT in existing designs?

A: Yes. The MIC4575WT is electrically and mechanically identical to the MIC4575BT. No circuit changes, PCB modifications, or firmware updates are required. Both devices operate identically across all specified input voltage, output voltage, current, and temperature ranges.

Q: What is the primary difference between MIC4575BT and MIC4575WT?

A: The MIC4575BT is obsolete and RoHS non-compliant. The MIC4575WT is an active product with ROHS3 compliance certification. Electrical and mechanical specifications are identical.

Q: Are there any package or mounting differences?

A: Both parts use the TO-220-5 through-hole package. The MIC4575WT is supplied in tube packaging, while the MIC4575BT packaging type is not specified. This does not affect electrical performance or PCB compatibility.

Q: What parameters determine substitution eligibility for MIC4575BT?

A: Substitutes must maintain identical specifications across: buck-boost topology, positive adjustable output, 4V–24V input range, 1.23V–20V output range, 1.7A switch current, 200kHz switching frequency, TO-220-5 package, and -40°C to 85°C operating temperature.

Q: Is the MIC4575WT suitable for new product designs?

A: Yes. The MIC4575WT is an active product with current manufacturer support and ROHS3 compliance, making it appropriate for new designs requiring buck-boost regulation with adjustable output in the specified electrical and thermal ranges.