MIC4576-3.3WU-TR Equivalent & Substitute Parts

Part Overview

The MIC4576-3.3WU-TR is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 3.3V output at 3A. This surface-mount power management IC operates across an input voltage range of 4V to 36V with a switching frequency of 200kHz. The device is housed in a TO-263-6 D2PAK package with 5 leads plus tab and maintains active product status with full RoHS3 compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges. Alternatives are necessary when primary inventory is unavailable or when design requirements permit operation within the broader specifications of substitute devices.

Substiute Parts

MIC4576-3.3WU-TR

Microchip TechnologyIn Stock: 3498MIC4576-3.3WU-TR Datasheet

Current PartRFQ

LM2575S-3.3/NOPB

Texas InstrumentsIn Stock: 2404LM2575S-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2575SX-3.3/NOPB

Texas InstrumentsIn Stock: 17633LM2575SX-3.3/NOPB Datasheet

MFR RecommendedRFQ

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

LM2595S-3.3/NOPB

Texas InstrumentsIn Stock: 1727LM2595S-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2596S-3.3/NOPB

Texas InstrumentsIn Stock: 2723LM2596S-3.3/NOPB Datasheet

MFR RecommendedRFQ

LM2596SX-3.3/NOPB

Texas InstrumentsIn Stock: 25443LM2596SX-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 are classified into two functional groups based on output current capability and input voltage range specifications:

Group 1: 1A Output Current Substitutes LM2575S-3.3/NOPB, LM2575SX-3.3/NOPB, LM2591HVS-3.3/NOPB, LM2591HVSX-3.3/NOPB, LM2595S-3.3/NOPB, TL2575-33IKTTR, and TL2575HV-33IKTTR deliver 1A output current. These are suitable for applications where the 3A capability of the main part exceeds design requirements.

Group 2: 3A Output Current Substitutes LM2596S-3.3/NOPB and LM2596SX-3.3/NOPB maintain the 3A output current specification of the MIC4576-3.3WU-TR, providing direct current-level equivalence.

All substitute parts share the following critical parameters with the main part:

• Fixed 3.3V output voltage
• TO-263-6 D2PAK package configuration
• Surface-mount technology
• RoHS3 compliance
• Positive output configuration
• Non-synchronous rectifier topology
• Moisture sensitivity level 3 (168 hours)

Substitution eligibility is determined by matching output voltage (3.3V fixed), package type (TO-263-6 D2PAK), and ensuring the substitute's output current rating meets or exceeds the application requirement.

Parameter Comparison

Engineering Selection Recommendations

For 3A Output Current Applications: LM2596S-3.3/NOPB and LM2596SX-3.3/NOPB provide direct current-level equivalence to the MIC4576-3.3WU-TR. Both devices maintain active product status and full RoHS3 compliance. The LM2596SX-3.3/NOPB variant offers Cut Tape & Digi-Reel packaging, matching the main part's distribution format. Operating temperature extends to 125°C, exceeding the MIC4576's -40°C to 85°C range. Input voltage range is limited to 4.5V to 40V, which is narrower than the MIC4576's 4V to 36V specification.

For 1A Output Current Applications: LM2575SX-3.3/NOPB and LM2591HVSX-3.3/NOPB are suitable when application current requirements do not exceed 1A. LM2575SX-3.3/NOPB operates across 4V to 40V input range with 52kHz switching frequency. LM2591HVSX-3.3/NOPB extends input voltage capability to 60V with 150kHz switching frequency. Both maintain active product status and RoHS3 compliance with Cut Tape & Digi-Reel packaging availability.

For Extended Input Voltage Range: LM2591HVS-3.3/NOPB and LM2591HVSX-3.3/NOPB support input voltages up to 60V, exceeding the MIC4576's 36V maximum. These devices are appropriate for applications requiring higher input voltage tolerance while accepting 1A output current limitation.

All recommended substitutes maintain the TO-263-6 D2PAK package configuration, ensuring mechanical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can LM2596S-3.3/NOPB directly replace MIC4576-3.3WU-TR in all applications? A: LM2596S-3.3/NOPB matches the 3A output current and 3.3V fixed output voltage. Both use TO-263-6 D2PAK packaging. However, the input voltage range differs: LM2596S operates 4.5V to 40V versus MIC4576's 4V to 36V. Substitution is valid when the application input voltage remains within 4.5V to 36V overlap range.

Q: What is the difference between LM2575SX-3.3/NOPB and LM2591HVSX-3.3/NOPB? A: Both deliver 1A output current and use TO-263-6 D2PAK packaging. LM2575SX operates 4V to 40V input range at 52kHz switching frequency. LM2591HVSX operates 4.5V to 60V input range at 150kHz switching frequency. Selection depends on required input voltage range and switching frequency tolerance.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts maintain RoHS3 compliance status, matching the MIC4576-3.3WU-TR environmental certification requirement.

Q: What packaging options are available for 3A substitutes? A: LM2596S-3.3/NOPB is supplied in Tube packaging. LM2596SX-3.3/NOPB is supplied in Cut Tape & Digi-Reel packaging, matching the MIC4576's distribution format.

Q: Can 1A-rated substitutes be used in applications requiring 3A output? A: No. 1A-rated devices (LM2575, LM2591, LM2595 series) cannot supply 3A continuous output current. Use only 3A-rated substitutes (LM2596 series) for applications requiring full 3A capability.

Q: What is the operating temperature difference between the main part and substitutes? A: MIC4576-3.3WU-TR operates -40°C to 85°C. All Texas Instruments substitutes extend to -40°C to 125°C, providing wider temperature range capability.