MIC4575-3.3WU-TR Equivalent & Substitute Parts

Part Overview

The MIC4575-3.3WU-TR is a buck and buck-boost switching regulator IC manufactured by Microchip Technology, delivering a fixed 3.3V output at 1.7A (switch current). This Power Management IC operates across an input voltage range of 4V to 24V with a switching frequency of 200kHz and is housed in a TO-263-6 D2PAK package. The device is actively produced and RoHS3 compliant, making it suitable for industrial and commercial applications requiring regulated 3.3V power delivery.

Equivalent and substitute parts are identified when design requirements change, supply constraints occur, or when alternative manufacturers' solutions offer compatible electrical and mechanical characteristics within the specified parameter tolerances.

Substiute Parts

MIC4575-3.3WU-TR

Microchip TechnologyIn Stock: 707MIC4575-3.3WU-TR Datasheet

Current PartRFQ

LM2591HVS-3.3/NOPB

Texas InstrumentsIn Stock: 1121LM2591HVS-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2591HVSX-3.3/NOPB

Texas InstrumentsIn Stock: 2369LM2591HVSX-3.3/NOPB Datasheet

MFR RecommendedRFQ

TL2575-33IKTTR

Texas InstrumentsIn Stock: 3717TL2575-33IKTTR Datasheet

MFR RecommendedRFQ

TL2575HV-33IKTTR

Texas InstrumentsIn Stock: 1809TL2575HV-33IKTTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC4575-3.3WU-TR are qualified based on the following electrical and mechanical compatibility criteria:

Critical Matching Parameters:

• Fixed output voltage of 3.3V
• Package type: TO-263-6 D2PAK (5 Leads + Tab)
• Surface mount mounting type
• Output configuration: Positive
• Output type: Fixed
• Number of outputs: 1
• RoHS3 compliance

Allowable Parameter Variations:

• Output current: Substitute parts rated at 1A are acceptable as they represent a conservative design margin relative to the 1.7A requirement
• Input voltage range: Substitute parts with extended input ranges (up to 60V) are compatible with the 4V to 24V operating window
• Switching frequency: Variations from 52kHz to 200kHz are acceptable within buck regulator topology standards
• Operating temperature: Extended ranges (-40°C to 125°C) are compatible with the base requirement of -40°C to 85°C
• Topology: Buck-only substitutes are compatible with buck-boost primary function when buck operation is the primary use case

The four substitute parts listed below meet these criteria and are manufactured by Texas Instruments under the SIMPLE SWITCHER® series or standard product lines.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are actively produced and RoHS3 compliant, meeting regulatory requirements equivalent to the MIC4575-3.3WU-TR. Selection among substitutes depends on specific application constraints:

LM2591HVS-3.3/NOPB and LM2591HVSX-3.3/NOPB: These Texas Instruments SIMPLE SWITCHER® devices operate at 150kHz switching frequency with extended input voltage tolerance up to 60V. The LM2591HVSX-3.3/NOPB variant is supplied in Tape & Reel packaging, matching the original part's TR packaging format. Both devices support the full -40°C to 125°C operating temperature range.

TL2575-33IKTTR and TL2575HV-33IKTTR: These Texas Instruments buck regulators operate at 52kHz switching frequency. The TL2575-33IKTTR supports input voltages up to 40V, while the TL2575HV-33IKTTR extends this to 60V. Both are supplied in Tape & Reel packaging and support the full -40°C to 125°C operating temperature range.

All substitute parts are housed in the identical TO-263-6 D2PAK package, ensuring mechanical and thermal compatibility with existing PCB layouts and thermal management designs.

Frequently Asked Questions (FAQ)

Q: Can the LM2591 series substitute for the MIC4575-3.3WU-TR in all applications?

A: The LM2591 series is compatible when the application operates in buck (step-down) mode. The LM2591 is a buck-only regulator, whereas the MIC4575 supports both buck and buck-boost topologies. If your design requires buck-boost operation, the MIC4575 is the appropriate choice.

Q: What is the significance of the 1A output current rating on substitute parts versus the 1.7A rating of the MIC4575?

A: The substitute parts are rated for 1A continuous output current, which is lower than the MIC4575's 1.7A rating. Applications requiring output currents above 1A must use the MIC4575 or verify that substitute parts can support the required load within their thermal and electrical specifications.

Q: Are the TL2575 and LM2591 devices interchangeable?

A: Both are buck regulators with identical 3.3V fixed output and TO-263-6 packaging. The primary differences are switching frequency (52kHz for TL2575 versus 150kHz for LM2591) and input voltage ranges. Selection depends on application requirements for input voltage tolerance and switching frequency constraints.

Q: Does the extended operating temperature range of substitute parts (-40°C to 125°C) affect compatibility?

A: No. The extended temperature range of substitute parts is a superset of the MIC4575's -40°C to 85°C range and does not introduce compatibility issues. Applications operating within -40°C to 85°C are fully supported by all substitute parts.

Q: What packaging options are available for these substitute parts?

A: The LM2591HVS-3.3/NOPB is supplied in Tube packaging. The LM2591HVSX-3.3/NOPB, TL2575-33IKTTR, and TL2575HV-33IKTTR are supplied in Tape & Reel (TR) packaging, matching the original MIC4575-3.3WU-TR format for automated assembly processes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and meet the same regulatory requirements as the MIC4575-3.3WU-TR.