MIC4423BM Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The MIC4423BM is a low-side gate driver IC manufactured by Microchip Technology, designed for driving N-Channel and P-Channel MOSFETs in 8-SOIC surface mount packaging. This part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and production continuity. The MIC4423BM operates across a 4.5V to 18V supply range with independent dual-channel configuration and inverting input logic, delivering 3A peak source and sink current capability.

Substiute Parts

MIC4423BM

Microchip TechnologyIn Stock: 9902MIC4423BM Datasheet

Current PartRFQ

MIC4423YM

Microchip TechnologyIn Stock: 1498MIC4423YM Datasheet

DirectRFQ

IR4426SPBF

Infineon TechnologiesIn Stock: 2605IR4426SPBF Datasheet

MFR RecommendedRFQ

IR4426STRPBF

Infineon TechnologiesIn Stock: 20720IR4426STRPBF Datasheet

MFR RecommendedRFQ

UCC27323D

Texas InstrumentsIn Stock: 1461UCC27323D Datasheet

MFR RecommendedRFQ

UCC27323DR

Texas InstrumentsIn Stock: 5247UCC27323DR Datasheet

MFR RecommendedRFQ

UCC27423D

Texas InstrumentsIn Stock: 2260UCC27423D Datasheet

MFR RecommendedRFQ

UCC37323DR

Texas InstrumentsIn Stock: 16478UCC37323DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MIC4423BM is determined by the following critical parameters:

• Package compatibility: 8-SOIC form factor (0.154", 3.90mm Width) for direct PCB footprint replacement
• Driven configuration: Low-side gate driver topology
• Channel configuration: Independent dual-channel operation
• Input logic type: Inverting input
• Supply voltage range: Minimum 4.5V operation required; 18V upper limit preferred for full compatibility
• Peak output current: Minimum 3A source and sink capability
• Gate type support: N-Channel and P-Channel MOSFET compatibility
• Operating temperature range: -40°C to 150°C junction temperature

Substitute parts meeting these criteria are grouped by manufacturer and product status to facilitate selection based on availability and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MIC4423YM

The MIC4423YM is the direct Microchip equivalent to the MIC4423BM, offering identical electrical specifications and 8-SOIC packaging. The MIC4423YM is currently active in production and ROHS3 compliant, addressing the RoHS non-compliance status of the original part. This substitute provides seamless design continuity with no circuit modifications required.

Secondary Substitutes: UCC27323DR and UCC37323DR

Both Texas Instruments parts (UCC27323DR and UCC37323DR) are active products with ROHS3 compliance and MSL 1 rating. These devices support the full -40°C to 150°C operating range and deliver 4A peak output current, exceeding the MIC4423BM specification. The UCC37323DR offers the highest inventory availability (16,400 units) among active substitutes. Logic voltage thresholds differ slightly (1V, 2V vs. 0.8V, 2.4V), requiring signal integrity verification in designs with marginal logic levels.

Alternative Substitutes: IR4426STRPBF

The IR4426STRPBF from Infineon is an active product with ROHS3 compliance and extended supply voltage range (6V ~ 20V). This part supports IGBT gate driving in addition to MOSFET applications. Peak source current is reduced to 2.3A, which may limit performance in high-frequency switching applications. MSL 2 rating requires controlled moisture exposure during storage and assembly.

Avoid: IR4426SPBF and UCC27423D

IR4426SPBF is obsolete. UCC27423D is in Last Time Buy status with limited future availability. Both parts should be avoided for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can MIC4423YM directly replace MIC4423BM without circuit modifications?

A: Yes. The MIC4423YM is electrically and mechanically identical to the MIC4423BM, with identical supply voltage range (4.5V ~ 18V), output current (3A, 3A), logic thresholds (0.8V, 2.4V), and 8-SOIC packaging. No design changes are required.

Q: What is the key difference between MIC4423YM and UCC27323DR?

A: The UCC27323DR delivers higher peak output current (4A vs. 3A) and operates across a narrower supply range (4.5V ~ 15V vs. 4.5V ~ 18V). Logic thresholds differ: UCC27323DR uses 1V/2V compared to MIC4423YM's 0.8V/2.4V. These differences may affect switching speed and signal compatibility in designs operating near supply voltage limits or with weak logic drivers.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitutes except the original MIC4423BM are ROHS3 compliant. If RoHS compliance is a design requirement, the MIC4423YM is the recommended choice as the direct Microchip equivalent.

Q: What does MSL 2 rating mean for the IR4426STRPBF?

A: MSL 2 indicates a 1-year moisture sensitivity level. The component must be stored in controlled humidity conditions and used within 1 year of the moisture barrier bag opening. MSL 1 parts (MIC4423YM, UCC27323DR, UCC37323DR) have unlimited shelf life and are preferred for inventory management.

Q: Can IR4426STRPBF replace MIC4423BM in all applications?

A: IR4426STRPBF is mechanically compatible (8-SOIC package) and functionally similar (low-side, dual-channel, inverting input). However, the reduced source current (2.3A vs. 3A) may limit performance in high-frequency or heavily capacitive gate load applications. The higher supply voltage range (6V ~ 20V) provides additional flexibility for designs operating above 18V.

Q: Which substitute offers the best long-term availability?

A: UCC37323DR from Texas Instruments is the recommended choice for long-term availability, with 16,400 units in stock and active product status. MIC4423YM is also active with 1,433 units available and provides the most direct electrical match to the original MIC4423BM.