MIC4576-5.0BT Equivalent & Substitute Parts

Part Overview

The MIC4576-5.0BT is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 5V output and 3A current capacity in a TO-220-5 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across input voltage range, output voltage specification, current rating, and package form factor while meeting modern compliance standards.

Substiute Parts

MIC4576-5.0BT

Microchip TechnologyIn Stock: 3093MIC4576-5.0BT Datasheet

Current PartRFQ

MIC4576-5.0WT

Microchip TechnologyIn Stock: 9076MIC4576-5.0WT Datasheet

DirectRFQ

LM2591HVT-5.0/NOPB

Texas InstrumentsIn Stock: 2138LM2591HVT-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2595T-5.0/NOPB

Texas InstrumentsIn Stock: 2163LM2595T-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2596T-5.0/NOPB

National SemiconductorIn Stock: 20316LM2596T-5.0/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: output voltage (5V fixed), package type (TO-220-5), mounting method (through hole), and output current capability. Parts are grouped into two categories based on current rating compatibility:

Category 1 - Direct Current Match (3A Output): MIC4576-5.0WT and LM2596T-5.0/NOPB maintain the 3A output current specification, making them suitable for applications requiring full current capacity of the original part.

Category 2 - Reduced Current Rating (1A Output): LM2591HVT-5.0/NOPB and LM2595T-5.0/NOPB provide 1A output current. These parts are substitutes only for applications where the load current does not exceed 1A, despite identical package and voltage specifications.

All substitute candidates share the same TO-220-5 package, through-hole mounting, fixed 5V output, and buck topology topology. Input voltage ranges vary slightly but remain compatible with the original 4V to 36V specification where the substitute range encompasses or exceeds this window.

Parameter Comparison

Engineering Selection Recommendations

MIC4576-5.0WT is the primary direct substitute for MIC4576-5.0BT. Both parts are manufactured by Microchip Technology, share identical electrical specifications (3A output current, 200kHz switching frequency, 4V to 36V input range), and use the same TO-220-5 package. MIC4576-5.0WT holds active product status and meets ROHS3 compliance, addressing the obsolescence and regulatory limitations of the original part. This substitute requires no circuit redesign.

LM2596T-5.0/NOPB from National Semiconductor provides equivalent current capacity (3A) and maintains the TO-220-5 package and 5V fixed output. Input voltage range extends to 40V (versus 36V maximum for the original), and operating temperature range extends to 125°C. Switching frequency is reduced to 150kHz. This part is suitable for applications where the lower switching frequency does not conflict with EMI or filtering requirements. Product status is active with full availability.

LM2591HVT-5.0/NOPB and LM2595T-5.0/NOPB from Texas Instruments are suitable only for applications where load current does not exceed 1A. Both parts feature extended operating temperature to 125°C and active product status. LM2591HVT-5.0/NOPB supports input voltage to 60V, while LM2595T-5.0/NOPB supports to 40V. These parts are not recommended for designs requiring the full 3A output current capability of the original MIC4576-5.0BT.

Selection priority: MIC4576-5.0WT for direct replacement; LM2596T-5.0/NOPB for equivalent current capacity with extended temperature range; LM2591HVT-5.0/NOPB or LM2595T-5.0/NOPB only for reduced-current applications.

Frequently Asked Questions (FAQ)

Q: Can MIC4576-5.0WT be used as a direct replacement for MIC4576-5.0BT without circuit modification?

A: Yes. MIC4576-5.0WT maintains identical electrical specifications, package type, and pin configuration. The primary difference is product status (active versus obsolete) and improved RoHS3 compliance. No circuit redesign is required.

Q: What is the key limitation when using LM2591HVT-5.0/NOPB or LM2595T-5.0/NOPB as substitutes?

A: Output current is limited to 1A, compared to 3A for the original MIC4576-5.0BT. These parts are suitable only for applications where the load current requirement does not exceed 1A. Using these parts in higher-current applications will result in thermal stress and potential device failure.

Q: How does the switching frequency difference between MIC4576-5.0BT (200kHz) and LM2596T-5.0/NOPB (150kHz) affect circuit design?

A: The 50kHz frequency reduction may require recalculation of output filter component values (inductor and capacitor) to maintain the same ripple voltage and current specifications. EMI characteristics may also differ. Circuit validation is recommended when switching frequency changes.

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

A: Yes. All substitute parts listed use the TO-220-5 through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for MIC4576-5.0BT.

Q: What is the significance of the extended operating temperature range in substitute parts?

A: LM2591HVT-5.0/NOPB, LM2595T-5.0/NOPB, and LM2596T-5.0/NOPB support -40°C to 125°C, compared to -40°C to 85°C for MIC4576-5.0BT. This extended range provides design margin for high-temperature applications but does not affect substitution eligibility for standard temperature environments.

Q: Is RoHS compliance a factor in selecting a substitute?

A: MIC4576-5.0BT is RoHS non-compliant, while MIC4576-5.0WT, LM2591HVT-5.0/NOPB, and LM2595T-5.0/NOPB are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, compliant substitutes are mandatory. MIC4576-5.0WT is the preferred choice to maintain full electrical equivalence while meeting compliance standards.