MIC4429BN Low-Side Gate Driver IC Equivalent & Substitute Parts

Part Overview

The MIC4429BN 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 component operates with an inverting input configuration and is packaged in an 8-PDIP through-hole format. The MIC4429BN is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across driven configuration, channel type, gate driver topology, and package specifications.

Substiute Parts

MIC4429BN

Microchip TechnologyIn Stock: 2275MIC4429BN Datasheet

Current PartRFQ

MIC4429YN

Microchip TechnologyIn Stock: 1485MIC4429YN Datasheet

DirectRFQ

UCC37322P

Texas InstrumentsIn Stock: 10606UCC37322P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC4429BN are identified based on the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Driven Configuration: Low-Side (required match)
• Channel Type: Single (required match)
• Number of Drivers: 1 (required match)
• Gate Type: N-Channel, P-Channel MOSFET (required match)
• Package / Case: 8-DIP (0.300", 7.62mm) (required match)
• Mounting Type: Through Hole (required match)

Secondary Compatibility Parameters:

• Voltage - Supply range (must encompass or overlap with 4.5V ~ 18V)
• Current - Peak Output capability (must meet or exceed 6A source/sink)
• Input Type (inverting or non-inverting configurations acceptable with design consideration)
• Operating Temperature range

Substitutes are grouped into two categories: direct equivalents maintaining identical electrical characteristics, and functional alternatives with enhanced or modified specifications suitable for the same application topology.

Parameter Comparison

Engineering Selection Recommendations

MIC4429YN (Direct Microchip Equivalent)

The MIC4429YN is the primary substitute for the obsolete MIC4429BN. Both parts share identical electrical specifications, including supply voltage range (4.5V ~ 18V), peak output current (6A source/sink), logic thresholds (0.8V, 2.4V), and switching characteristics (12ns rise, 13ns fall time). The MIC4429YN maintains the same inverting input topology and 8-DIP package configuration. The critical distinction is product status: MIC4429YN is active and ROHS3 compliant, whereas MIC4429BN is obsolete and RoHS non-compliant. For applications requiring direct pin-for-pin and functional replacement with no circuit modification, MIC4429YN is the recommended selection.

UCC37322P (Texas Instruments Alternative)

The UCC37322P is a functional alternative manufactured by Texas Instruments, suitable for applications where the MIC4429YN is unavailable. This part maintains the same low-side driven configuration, single-channel topology, and 8-DIP package format. Key differences include non-inverting input logic (versus inverting on MIC4429BN), higher peak output current capability (9A source/sink versus 6A), and different logic thresholds (1.1V, 2.7V versus 0.8V, 2.4V). The UCC37322P operates within a narrower supply voltage range (4V ~ 15V) and restricted temperature range (0°C ~ 70°C). Selection of UCC37322P requires circuit design review to accommodate the non-inverting input configuration and verification that the 4V minimum supply voltage and 70°C maximum junction temperature meet application requirements. The UCC37322P is active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can MIC4429YN be used as a direct replacement for MIC4429BN without circuit modification?

A: Yes. The MIC4429YN is electrically and functionally identical to the MIC4429BN across all specified parameters: supply voltage (4.5V ~ 18V), output current (6A), logic thresholds (0.8V, 2.4V), switching speed (12ns/13ns), and inverting input configuration. The 8-DIP package pinout is identical. No circuit modification is required.

Q: What are the key differences between MIC4429YN and UCC37322P?

A: The primary differences are input logic type (MIC4429YN is inverting; UCC37322P is non-inverting), peak output current (6A versus 9A), logic thresholds (0.8V/2.4V versus 1.1V/2.7V), supply voltage range (4.5V~18V versus 4V~15V), and operating temperature range (-40°C~150°C versus 0°C~70°C). Both maintain the same low-side driven configuration and 8-DIP package.

Q: Can UCC37322P replace MIC4429BN in existing designs?

A: UCC37322P can replace MIC4429BN only if the circuit is designed to accommodate the non-inverting input logic. The inverting and non-inverting configurations produce opposite output states for the same input signal. If the original design requires inverting logic, the UCC37322P requires either circuit modification or external logic inversion. Verify that the narrower supply voltage range (4V ~ 15V) and operating temperature range (0°C ~ 70°C) meet application requirements.

Q: Are all substitute parts available in the same package?

A: Yes. MIC4429BN, MIC4429YN, and UCC37322P are all packaged in 8-DIP (0.300", 7.62mm) through-hole format with identical pinout compatibility for the low-side gate driver function.

Q: What is the compliance status of substitute parts?

A: MIC4429YN and UCC37322P are both ROHS3 compliant and carry active product status. The original MIC4429BN is RoHS non-compliant and obsolete. For new designs or systems requiring RoHS compliance, either MIC4429YN or UCC37322P is required.

Q: How do the switching characteristics compare?

A: MIC4429BN and MIC4429YN have identical switching characteristics: 12ns typical rise time and 13ns typical fall time. UCC37322P has slower switching characteristics at 20ns rise and fall time. For applications sensitive to gate driver propagation delay or switching speed, MIC4429YN maintains the original performance profile.