MIC4575-3.3BT Equivalent & Substitute Parts

Part Overview

The MIC4575-3.3BT is a buck and buck-boost switching regulator IC from Microchip Technology, designed to deliver a fixed 3.3V output at 1.7A (switch current) from input sources ranging 4V to 24V. This TO-220-5 package device operates across -40°C to 85°C and features a 200kHz switching frequency. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Substiute Parts

MIC4575-3.3BT

Microchip TechnologyIn Stock: 4711MIC4575-3.3BT Datasheet

Current PartRFQ

MIC4575-3.3WT

Microchip TechnologyIn Stock: 4220MIC4575-3.3WT 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

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC4575-3.3BT is determined by the following critical parameters:

• Output Voltage: 3.3V fixed output (all substitutes must match)
• Package Type: TO-220-5 through-hole mounting (all substitutes must match)
• Topology Compatibility: Buck or buck-boost topology acceptable
• Input Voltage Range: Minimum 4V input support required
• Output Current Capability: Minimum 1A output current required
• Switching Frequency: 150kHz to 200kHz acceptable range
• Operating Temperature: -40°C minimum and 85°C minimum operating range required
• RoHS/REACH Compliance: Active product status preferred for long-term availability

Three substitute parts meet these criteria and are grouped by manufacturer and compliance status.

Parameter Comparison

Engineering Selection Recommendations

MIC4575-3.3WT (Microchip Technology) is the direct equivalent replacement. It maintains identical electrical specifications (1.7A output, 200kHz switching frequency, -40°C to 85°C operating range) and identical package configuration (TO-220-5). This part is active and ROHS3 compliant, providing superior long-term availability compared to the obsolete MIC4575-3.3BT. Pinout and application circuit compatibility are guaranteed.

AP1501-33T5L-U (Diodes Incorporated) is a functional substitute with higher output current capability (3A versus 1.7A). It operates in the same TO-220-5L package and is ROHS3 compliant. The increased current rating provides design margin for applications requiring higher transient current delivery. Input voltage range and switching frequency specifications are not provided in available documentation.

LM2591HVT-3.3/NOPB (Texas Instruments) is a functional substitute with reduced output current (1A versus 1.7A). It operates in TO-220-5 package with formed leads and is ROHS3 compliant. This part supports higher input voltage (up to 60V) and extended operating temperature range (-40°C to 125°C). The lower output current rating limits its use to applications with reduced current requirements. Switching frequency is 150kHz, within acceptable range.

For new designs and long-term support, MIC4575-3.3WT is the preferred choice. For applications requiring higher current capability, AP1501-33T5L-U is suitable. For applications with lower current requirements and extended temperature range, LM2591HVT-3.3/NOPB is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MIC4575-3.3WT directly replace MIC4575-3.3BT without circuit modification?

A: Yes. MIC4575-3.3WT is the direct equivalent with identical electrical specifications, pinout, and package configuration. No circuit modifications are required.

Q: What is the key difference between MIC4575-3.3BT and MIC4575-3.3WT?

A: The primary difference is product status and compliance. MIC4575-3.3BT is obsolete and RoHS non-compliant. MIC4575-3.3WT is active and ROHS3 compliant, ensuring ongoing availability and regulatory compliance.

Q: Can AP1501-33T5L-U be used in place of MIC4575-3.3BT?

A: AP1501-33T5L-U is functionally compatible for applications requiring 3.3V output at up to 3A. The higher current rating makes it suitable for designs with increased current demands. Verify input voltage range and switching frequency compatibility with your specific application requirements.

Q: Why does LM2591HVT-3.3/NOPB have lower output current than the original part?

A: LM2591HVT-3.3/NOPB is rated for 1A output current, below the 1.7A requirement of MIC4575-3.3BT. This part is suitable only for applications with current requirements at or below 1A. For applications requiring 1.7A, use MIC4575-3.3WT or AP1501-33T5L-U.

Q: Are all substitute parts available in the same TO-220-5 package?

A: MIC4575-3.3WT and LM2591HVT-3.3/NOPB use standard TO-220-5 packages. AP1501-33T5L-U uses TO-220-5L package (with formed leads). All three are through-hole mounted and mechanically compatible with standard TO-220-5 footprints.

Q: Which substitute part has the widest input voltage range?

A: LM2591HVT-3.3/NOPB supports input voltage up to 60V, compared to 24V maximum for MIC4575-3.3BT and MIC4575-3.3WT. This makes it suitable for applications with higher input voltage sources.

Q: Are all substitute parts RoHS compliant?

A: MIC4575-3.3WT, AP1501-33T5L-U, and LM2591HVT-3.3/NOPB are all ROHS3 compliant. The original MIC4575-3.3BT is RoHS non-compliant.