MIC4574BN Equivalent & Substitute Parts

Part Overview

The MIC4574BN is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion applications. It delivers positive adjustable output from 1.23V to 20V with a maximum output current of 500mA, operating across an input voltage range of 4V to 24V. The device is housed in an 8-DIP package and operates at a switching frequency of 200kHz.

The MIC4574BN is classified as obsolete. Identifying suitable substitute parts is necessary to ensure continued availability for new designs, maintenance applications, and production continuity where original inventory becomes depleted.

Substiute Parts

MIC4574BN

Microchip TechnologyIn Stock: 1577MIC4574BN Datasheet

Current PartRFQ

MIC4574YN

Microchip TechnologyIn Stock: 3503MIC4574YN Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MIC4574BN is determined by strict equivalence across the following critical parameters:

• Topology & Function: Buck (step-down) converter with positive adjustable output
• Electrical Specifications: Input voltage range 4V–24V, output range 1.23V–20V, 500mA output current, 200kHz switching frequency
• Output Configuration: Single positive adjustable output
• Package & Mounting: 8-DIP through-hole package (0.300", 7.62mm)
• Operating Temperature Range: -40°C to 85°C

The MIC4574YN meets all these criteria and is therefore a direct functional equivalent suitable for substitution in applications currently using the MIC4574BN.

Parameter Comparison

Engineering Selection Recommendations

The MIC4574YN is the direct substitute for the MIC4574BN. Both devices share identical electrical and mechanical specifications, ensuring pin-for-pin compatibility and functional equivalence in circuit applications.

The MIC4574YN offers the additional advantage of active product status and ROHS3 compliance, making it the preferred choice for new designs and applications requiring regulatory compliance. The MIC4574BN, classified as obsolete, should be replaced with the MIC4574YN for long-term supply chain reliability and compliance with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the MIC4574YN directly replace the MIC4574BN in existing designs?

A: Yes. The MIC4574YN is a direct pin-for-pin and functional equivalent. All electrical parameters, package dimensions, and operating characteristics are identical. No circuit modifications are required.

Q: What is the difference between the MIC4574BN and MIC4574YN?

A: The primary differences are product status and compliance certification. The MIC4574BN is obsolete, while the MIC4574YN is active. The MIC4574YN is ROHS3 compliant, whereas the MIC4574BN is RoHS non-compliant. Electrical and mechanical specifications are identical.

Q: Are there any package or mounting differences?

A: No. Both devices use the same 8-DIP (0.300", 7.62mm) through-hole package with identical pin configurations and mechanical dimensions.

Q: Why should I transition from MIC4574BN to MIC4574YN?

A: The MIC4574BN is obsolete and subject to limited availability. The MIC4574YN ensures continued supply chain access, meets current environmental compliance standards (ROHS3), and maintains full functional compatibility with existing circuit designs.

Q: Are the switching frequency and output current specifications the same?

A: Yes. Both devices operate at 200kHz switching frequency and deliver a maximum output current of 500mA. Input and output voltage ranges are also identical.