MIC4576BT Equivalent & Substitute Parts

Part Overview

The MIC4576BT is a buck switching regulator IC from Microchip Technology designed for positive adjustable output applications. It delivers 3A output current with an adjustable output voltage range from 1.23V to 33V, operating from a 4V to 36V input supply. The device is packaged in TO-220-5 and operates across the industrial temperature range of -40°C to 85°C.

The MIC4576BT carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications currently using this component.

Substiute Parts

MIC4576BT

Microchip TechnologyIn Stock: 1857MIC4576BT Datasheet

Current PartRFQ

MIC4576WT

Microchip TechnologyIn Stock: 1243MIC4576WT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MIC4576BT is determined by strict equivalence across the following critical parameters:

• Topology: Buck switching regulator
• Output configuration: Positive adjustable
• Voltage specifications: Input 4V–36V, Output 1.23V–33V adjustable
• Current rating: 3A output
• Switching frequency: 200kHz
• Package: TO-220-5 through-hole
• Operating temperature range: -40°C to 85°C

The MIC4576WT meets all these criteria and is classified as a direct substitute. Both parts share identical electrical specifications and mechanical packaging, differing only in product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The MIC4576WT is the direct functional equivalent of the MIC4576BT. Both devices are manufactured by Microchip Technology and provide identical electrical and mechanical performance across all specified parameters.

The MIC4576WT offers two significant advantages:

• Active product status ensures ongoing availability and manufacturer support
• ROHS3 compliance satisfies modern environmental and regulatory requirements, whereas the MIC4576BT is non-compliant

For new designs or component replenishment, the MIC4576WT is the appropriate selection. For legacy systems currently operating with the MIC4576BT, the MIC4576WT provides drop-in compatibility without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the MIC4576WT replace the MIC4576BT in existing applications?

A: Yes. The MIC4576WT is electrically and mechanically identical to the MIC4576BT. Both devices operate with the same input voltage range (4V–36V), output voltage range (1.23V–33V), output current (3A), switching frequency (200kHz), and temperature range (-40°C to 85°C). The TO-220-5 package is identical, enabling direct PCB substitution.

Q: What is the difference between the MIC4576BT and MIC4576WT?

A: The primary differences are product status and compliance certification. The MIC4576BT is obsolete and RoHS non-compliant. The MIC4576WT is an active product with ROHS3 compliance. Electrical specifications and package form factor are identical.

Q: Why is the MIC4576BT obsolete?

A: Microchip Technology has transitioned the MIC4576 product line to the MIC4576WT variant, which meets current RoHS3 environmental standards. The obsolete status reflects this product line consolidation.

Q: Are there packaging differences between these parts?

A: The MIC4576BT and MIC4576WT both use TO-220-5 through-hole packaging. The MIC4576WT is supplied in tube packaging, while the MIC4576BT packaging format is not specified in the provided data. Both are compatible with standard through-hole PCB assembly processes.

Q: What certifications apply to these parts?

A: Both parts carry REACH Unaffected and EAR99 ECCN classifications. The MIC4576WT additionally meets ROHS3 compliance requirements. The MIC4576BT does not carry RoHS certification.