MIC4451BN Equivalent & Substitute Parts

Part Overview

The MIC4451BN is a low-side gate driver IC manufactured by Microchip Technology, designed for driving IGBT and N-Channel MOSFET gates in power management applications. This device operates with a supply voltage range of 4.5V to 18V and delivers peak output currents of 12A for both source and sink configurations. The MIC4451BN is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

MIC4451BN

Microchip TechnologyIn Stock: 941MIC4451BN Datasheet

Current PartRFQ

MIC4451YN

Microchip TechnologyIn Stock: 1522MIC4451YN Datasheet

DirectRFQ

UCC37321P

Texas InstrumentsIn Stock: 1593UCC37321P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the MIC4451BN are identified based on functional equivalence within the low-side gate driver category. The critical parameters determining substitution compatibility are:

• Driven configuration (low-side operation)
• Single channel, single driver architecture
• Gate type compatibility (IGBT and/or N-Channel MOSFET support)
• Package form factor (8-DIP through-hole)
• Input type (inverting logic)

The MIC4451YN represents a direct manufacturer upgrade from Microchip Technology, maintaining identical electrical specifications while offering improved product status and RoHS3 compliance. The UCC37321P from Texas Instruments provides functional substitution with compatible package and configuration, though with modified electrical parameters within acceptable operating ranges for low-side gate driving applications.

Parameter Comparison

Engineering Selection Recommendations

The MIC4451YN is the primary substitute for the obsolete MIC4451BN. Both devices are manufactured by Microchip Technology and maintain identical electrical specifications across all critical parameters. The MIC4451YN offers active product status and ROHS3 compliance, addressing regulatory requirements for new designs and long-term system support.

The UCC37321P from Texas Instruments provides an alternative low-side gate driver solution with compatible package and configuration. This device operates within a reduced supply voltage range (4V to 15V versus 4.5V to 18V) and delivers lower peak output current (9A versus 12A). The UCC37321P is classified as Last Time Buy, indicating limited future availability. Selection of the UCC37321P requires verification that the reduced supply voltage range and output current specifications align with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the MIC4451YN directly replace the MIC4451BN without circuit modifications?

A: Yes. The MIC4451YN maintains identical electrical specifications and package form factor. Direct substitution is supported without circuit redesign.

Q: What are the key differences between the MIC4451BN and UCC37321P?

A: The UCC37321P operates with a reduced supply voltage range (4V to 15V) and lower peak output current (9A) compared to the MIC4451BN (4.5V to 18V, 12A). The UCC37321P also supports P-Channel MOSFET gates in addition to N-Channel devices. Operating temperature range is narrower (0°C to 70°C versus -40°C to 85°C). These differences require system-level verification before substitution.

Q: Why is the MIC4451BN classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The MIC4451YN represents the active replacement from Microchip Technology.

Q: Are both substitute parts available in the same packaging?

A: Yes. All three devices (MIC4451BN, MIC4451YN, and UCC37321P) are packaged in 8-DIP through-hole form factor with identical pin spacing (0.300", 7.62mm).

Q: What compliance certifications apply to each device?

A: The MIC4451BN is RoHS non-compliant. Both the MIC4451YN and UCC37321P are ROHS3 compliant. All three devices are REACH unaffected and classified under ECCN EAR99.