MIC4575-5.0BT Equivalent & Substitute Parts

Part Overview

The MIC4575-5.0BT is a Buck/Buck-Boost Switching Regulator IC from Microchip Technology, designed to deliver a fixed 5V output at 1.7A from input sources ranging 4V to 24V. This component operates at 200kHz switching frequency and is housed in a TO-220-5 package for through-hole mounting applications.

The MIC4575-5.0BT is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this regulator.

Substiute Parts

MIC4575-5.0BT

Microchip TechnologyIn Stock: 6732MIC4575-5.0BT Datasheet

Current PartRFQ

MIC4575-5.0WT

Microchip TechnologyIn Stock: 8003MIC4575-5.0WT Datasheet

DirectRFQ

LM2591HVT-5.0/NOPB

Texas InstrumentsIn Stock: 2138LM2591HVT-5.0/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC4575-5.0BT are identified based on the following critical parameters that determine functional compatibility:

• Output Voltage: Fixed 5V output requirement
• Package Type: TO-220-5 through-hole mounting
• Input Voltage Range: Minimum 4V input capability
• Output Current Capability: Minimum 1A output current
• Switching Frequency: Operational range around 150kHz to 200kHz
• Operating Temperature Range: Support for -40°C minimum operating temperature
• RoHS Compliance: Preference for ROHS3 compliant alternatives

Two substitute parts meet these criteria: the MIC4575-5.0WT (direct Microchip equivalent) and the LM2591HVT-5.0/NOPB (Texas Instruments alternative).

Parameter Comparison

Engineering Selection Recommendations

MIC4575-5.0WT is the primary substitute for the MIC4575-5.0BT. Both parts share identical electrical specifications, topology, and package configuration. The MIC4575-5.0WT is currently in active production status and is ROHS3 compliant, addressing the obsolescence of the original part while maintaining full functional compatibility. The only difference is packaging format (Tube vs. original specification), which does not affect electrical performance.

LM2591HVT-5.0/NOPB serves as an alternative substitute when MIC4575-5.0WT availability is constrained. This Texas Instruments regulator provides the same 5V fixed output and TO-220-5 package. Key differences include reduced output current (1A vs. 1.7A), Buck-only topology (vs. Buck-Boost), higher maximum input voltage (60V vs. 24V), and lower switching frequency (150kHz vs. 200kHz). The LM2591HVT-5.0/NOPB is active and ROHS3 compliant. Applications requiring the full 1.7A output current or Buck-Boost functionality should prioritize the MIC4575-5.0WT.

Frequently Asked Questions (FAQ)

Q: Can the MIC4575-5.0WT directly replace the MIC4575-5.0BT without circuit modifications?

A: Yes. The MIC4575-5.0WT is electrically and functionally identical to the MIC4575-5.0BT. Both devices share the same output voltage, current rating, input voltage range, switching frequency, and TO-220-5 package. No circuit modifications are required.

Q: What are the limitations of using LM2591HVT-5.0/NOPB as a substitute?

A: The LM2591HVT-5.0/NOPB has two key limitations: (1) reduced output current of 1A compared to 1.7A, and (2) Buck-only topology versus Buck-Boost topology. Applications requiring step-up or step-up/step-down conversion cannot use this part. Applications requiring output currents above 1A may exceed this device's capability.

Q: Are there package compatibility concerns between these substitutes?

A: All three parts use TO-220-5 packages suitable for through-hole mounting. The MIC4575-5.0WT and MIC4575-5.0BT are fully compatible. The LM2591HVT-5.0/NOPB uses TO-220-5 Formed Leads, which is mechanically compatible with standard TO-220-5 footprints but may require verification of lead forming specifications for specific PCB designs.

Q: Why is the MIC4575-5.0BT obsolete?

A: The MIC4575-5.0BT is classified as obsolete by Microchip Technology. The MIC4575-5.0WT represents the current active production equivalent and should be used for new designs and ongoing supply requirements.

Q: What is the temperature operating range difference between substitutes?

A: The MIC4575-5.0BT and MIC4575-5.0WT both operate from -40°C to 85°C (TA). The LM2591HVT-5.0/NOPB extends to -40°C to 125°C (TJ), providing wider high-temperature operation. For applications requiring operation above 85°C, the LM2591HVT-5.0/NOPB offers superior thermal performance.

Q: Are all substitutes RoHS compliant?

A: The MIC4575-5.0BT is RoHS non-compliant. Both the MIC4575-5.0WT and LM2591HVT-5.0/NOPB are ROHS3 compliant, meeting current environmental and regulatory requirements.