MIC4421ACT Equivalent & Substitute Parts

Part Overview

The MIC4421ACT is a low-side gate driver IC in TO-220-5 packaging manufactured by Microchip Technology. It is designed to drive N-channel MOSFETs with inverting logic configuration. The device operates from a 4.5V to 18V supply and delivers 9A peak output current for both source and sink operations.

The MIC4421ACT is classified as obsolete. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently using this component.

Substiute Parts

MIC4421ACT

Microchip TechnologyIn Stock: 795MIC4421ACT Datasheet

Current PartRFQ

MIC4421AZT

Microchip TechnologyIn Stock: 633MIC4421AZT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MIC4421ACT is determined by strict equivalence across the following critical parameters:

• Driven Configuration: Low-Side only
• Channel Type: Single channel
• Gate Type: N-Channel MOSFET
• Input Type: Inverting logic
• Voltage - Supply: 4.5V ~ 18V
• Current - Peak Output: 9A source and 9A sink minimum
• Logic Voltage Thresholds: VIL 0.8V, VIH 3V
• Rise / Fall Time: 20ns rise, 24ns fall (typical)
• Operating Temperature Range: 0°C ~ 150°C (TJ)
• Package / Case: TO-220-5 form factor
• Mounting Type: Through Hole

The MIC4421AZT qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility across all parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The MIC4421AZT is a direct electrical and mechanical equivalent to the MIC4421ACT. Both devices share identical functional specifications, electrical performance characteristics, and physical form factor.

The primary distinction between the two parts is product status and regulatory compliance. The MIC4421ACT is obsolete, while the MIC4421AZT maintains active production status. The MIC4421AZT also carries ROHS3 compliance certification, whereas the MIC4421ACT is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

For new designs or applications requiring long-term component availability, the MIC4421AZT is the appropriate selection. For legacy system maintenance where the original MIC4421ACT specification must be preserved, the MIC4421AZT provides full functional compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the MIC4421AZT replace the MIC4421ACT in existing designs?

A: Yes. The MIC4421AZT is electrically and mechanically identical to the MIC4421ACT. All electrical parameters, timing characteristics, and pin configurations are equivalent. Direct substitution requires no circuit modifications.

Q: What is the difference between MIC4421ACT and MIC4421AZT?

A: The devices are functionally identical. The primary differences are product status (MIC4421ACT is obsolete; MIC4421AZT is active) and RoHS compliance (MIC4421AZT is ROHS3 compliant; MIC4421ACT is non-compliant). Both maintain identical electrical specifications and TO-220-5 packaging.

Q: Are there any pin configuration differences between these parts?

A: No. Both the MIC4421ACT and MIC4421AZT use the TO-220-5 package with identical pin assignments and functional pinout. No PCB layout modifications are required for substitution.

Q: What supply voltage range do these gate drivers support?

A: Both devices operate from 4.5V to 18V supply voltage. Logic input thresholds are VIL 0.8V and VIH 3V. Peak output current is 9A for both source and sink operations.

Q: What is the operating temperature range?

A: Both the MIC4421ACT and MIC4421AZT operate across a junction temperature range of 0°C to 150°C (TJ).

Q: Why is the MIC4421ACT marked as obsolete?

A: The MIC4421ACT has been discontinued by Microchip Technology. The MIC4421AZT represents the active production equivalent and is the recommended part for current procurement and new designs.