MIC4576-3.3BT Equivalent & Substitute Parts

Part Overview

The MIC4576-3.3BT is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 3.3V output and 3A current capacity. This device operates across a 4V to 36V input range and is packaged in TO-220-5 through-hole configuration. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Active alternatives with matching or superior electrical characteristics are available from multiple manufacturers.

Substiute Parts

MIC4576-3.3BT

Microchip TechnologyIn Stock: 1974MIC4576-3.3BT Datasheet

Current PartRFQ

MIC4576-3.3WT

Microchip TechnologyIn Stock: 3727MIC4576-3.3WT Datasheet

DirectRFQ

AP1501-33T5L-U

Diodes IncorporatedIn Stock: 1952AP1501-33T5L-U Datasheet

MFR RecommendedRFQ

LM2591HVT-3.3/NOPB

Texas InstrumentsIn Stock: 2169LM2591HVT-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2595T-3.3/NOPB

Texas InstrumentsIn Stock: 957LM2595T-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2596T-3.3/NOPB

Texas InstrumentsIn Stock: 4142LM2596T-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MIC4576-3.3BT is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package / Case: Must be TO-220-5 through-hole configuration
• Topology: Must be buck (step-down) switching regulator
• Output Configuration: Must be positive fixed output
• Number of Outputs: Must be single output
• Mounting Type: Must be through-hole

Substitute parts are grouped into two categories:

Direct Equivalent (Same Manufacturer): MIC4576-3.3WT from Microchip Technology maintains identical electrical specifications and packaging while offering active product status and RoHS3 compliance.

Cross-Manufacturer Alternatives: AP1501-33T5L-U (Diodes Incorporated), LM2591HVT-3.3/NOPB, LM2595T-3.3/NOPB, and LM2596T-3.3/NOPB (Texas Instruments) provide functional equivalence with matching output voltage, package, and topology. These alternatives differ in output current capacity, input voltage range, switching frequency, and operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MIC4576-3.3WT is the preferred substitute. It maintains identical electrical specifications and TO-220-5 packaging while offering active product status and RoHS3 compliance. This direct equivalent from the same manufacturer ensures design compatibility with minimal risk.

Secondary Recommendations: LM2596T-3.3/NOPB from Texas Instruments matches the 3A output current and 3.3V fixed output voltage specifications. It provides active product status, RoHS3 compliance, and extended operating temperature range (-40°C to 125°C). Input voltage range is limited to 4.5V to 40V compared to the original 4V to 36V specification.

Current-Limited Alternatives: LM2591HVT-3.3/NOPB and LM2595T-3.3/NOPB are suitable only for applications requiring 1A or less output current. Both offer active product status, RoHS3 compliance, and extended temperature ranges. LM2591HVT-3.3/NOPB supports higher input voltage (up to 60V) compared to LM2595T-3.3/NOPB (up to 40V).

Cross-Manufacturer Option: AP1501-33T5L-U from Diodes Incorporated provides 3A output current and TO-220-5L packaging. Product status is active with RoHS3 compliance. Detailed electrical specifications for input voltage range and switching frequency are not provided in available documentation.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2591HVT-3.3/NOPB or LM2595T-3.3/NOPB replace MIC4576-3.3BT in all applications?

A: No. These parts are limited to 1A output current, while the MIC4576-3.3BT is rated for 3A. They are suitable only for applications requiring 1A or less. For 3A applications, use MIC4576-3.3WT or LM2596T-3.3/NOPB.

Q: What is the difference between MIC4576-3.3BT and MIC4576-3.3WT?

A: Both parts share identical electrical specifications and TO-220-5 packaging. The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and packaging format (bulk vs. tube). MIC4576-3.3WT is the direct active equivalent.

Q: Are all substitute parts available in TO-220-5 packaging?

A: Yes. All listed substitutes use TO-220-5 or TO-220-5L through-hole packaging, maintaining mechanical compatibility with the original MIC4576-3.3BT footprint.

Q: Does the lower switching frequency of Texas Instruments parts affect compatibility?

A: Switching frequency differences (150kHz vs. 200kHz) may affect output ripple voltage and component selection for filtering circuits. Design verification is necessary if output noise specifications are critical to the application.

Q: Which substitute offers the widest input voltage range?

A: LM2591HVT-3.3/NOPB supports 4.5V to 60V input range, the widest among specified alternatives. However, it is limited to 1A output current.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant, meeting current regulatory requirements. The original MIC4576-3.3BT is RoHS non-compliant.