MIC4420BMM Equivalent & Substitute Parts

Part Overview

The MIC4420BMM is a low-side gate driver IC manufactured by Microchip Technology, designed for driving N-Channel and P-Channel MOSFETs in power management applications. This non-inverting gate driver operates across a 4.5V to 18V supply range with 6A peak output current capability. The MIC4420BMM is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

MIC4420BMM

Microchip TechnologyIn Stock: 1124MIC4420BMM Datasheet

Current PartRFQ

MIC4420YMM

Microchip TechnologyIn Stock: 2750MIC4420YMM Datasheet

DirectRFQ

UCC27321DGN

Texas InstrumentsIn Stock: 1559UCC27321DGN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC4420BMM is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Driven Configuration: Low-Side
• Channel Type: Single
• Gate Type: N-Channel, P-Channel MOSFET support
• Supply Voltage Range: Must encompass or overlap with 4.5V ~ 18V
• Peak Output Current: Minimum 6A source and sink capability
• Input Logic Type: Non-Inverting operation preferred for direct pin compatibility

Mechanical Compatibility Requirements:

• Package / Case: 8-TSSOP or 8-MSOP footprint
• Mounting Type: Surface Mount
• Pin count: 8 pins

Compliance Considerations:

• RoHS Status: Preference for RoHS3 compliant alternatives
• Moisture Sensitivity Level: MSL 1 or equivalent

Two substitute parts meet the functional and mechanical criteria for the MIC4420BMM:

1. MIC4420YMM (Microchip Technology) – Direct electrical and mechanical equivalent with identical specifications and improved compliance status
2. UCC27321DGN (Texas Instruments) – Functionally compatible alternative with enhanced output current capability and different input logic configuration

Parameter Comparison

Engineering Selection Recommendations

MIC4420YMM is the primary substitute for MIC4420BMM. This part maintains identical electrical specifications, mechanical compatibility, and thermal operating range. The MIC4420YMM is currently in active production status with ROHS3 compliance, providing superior supply chain availability and regulatory alignment compared to the discontinued MIC4420BMM. Packaging format transitions from Bulk to Tube, which does not affect functional performance.

UCC27321DGN serves as an alternative substitute when enhanced output current capability is required. This Texas Instruments part provides 9A peak output current versus the 6A specification of the MIC4420BMM, supporting higher-current gate drive applications. However, the UCC27321DGN operates with inverting input logic, requiring circuit-level modifications to input signal conditioning. The supply voltage range is constrained to 4V ~ 15V, which may limit operation in systems requiring the full 4.5V ~ 18V range of the MIC4420BMM. The UCC27321DGN is designated Last Time Buy status, indicating limited future availability.

Selection between MIC4420YMM and UCC27321DGN depends on application requirements for output current, input logic configuration, and supply voltage range. For direct replacement without circuit modification, MIC4420YMM is the appropriate choice.

Frequently Asked Questions (FAQ)

Q: Can MIC4420YMM directly replace MIC4420BMM without circuit modification?

A: Yes. The MIC4420YMM is electrically and mechanically identical to the MIC4420BMM across all specified parameters. Pin configuration, signal logic, and performance characteristics are equivalent. The transition from Bulk to Tube packaging does not affect functional performance.

Q: What are the key differences between MIC4420YMM and UCC27321DGN?

A: The primary differences are input logic type (Non-Inverting vs. Inverting), peak output current (6A vs. 9A), rise/fall time (12ns/13ns vs. 20ns/20ns), and supply voltage range (4.5V~18V vs. 4V~15V). The UCC27321DGN requires input signal inversion for compatibility with circuits designed for the MIC4420BMM.

Q: Is the 8-MSOP package footprint identical across all three parts?

A: The MIC4420BMM and MIC4420YMM use standard 8-MSOP footprints. The UCC27321DGN uses 8-HVSSOP with an exposed pad, which is mechanically compatible with 8-MSOP PCB layouts but includes an additional thermal pad for enhanced heat dissipation.

Q: What is the impact of the UCC27321DGN's inverting input logic?

A: Inverting logic inverts the input signal before driving the gate output. Circuits designed for non-inverting gate drivers require input signal conditioning or logic inversion at the driver input to maintain correct gate drive timing and MOSFET switching behavior.

Q: Are there supply voltage compatibility concerns with UCC27321DGN?

A: The UCC27321DGN operates within 4V ~ 15V, which does not fully encompass the MIC4420BMM's 4.5V ~ 18V range. Applications requiring supply voltages above 15V cannot use the UCC27321DGN without external voltage regulation.

Q: What is the significance of Last Time Buy status for UCC27321DGN?

A: Last Time Buy designation indicates that Texas Instruments has announced end-of-life for this part. Existing inventory may be available, but future production is not planned. Long-term design continuity should prioritize MIC4420YMM or alternative active-status gate drivers.

Q: Does RoHS compliance affect functional performance?

A: RoHS compliance does not affect electrical or thermal performance. ROHS3 compliance of MIC4420YMM and UCC27321DGN indicates conformance to hazardous substance restrictions, which may be required for applications subject to environmental regulations or customer specifications.