MIC4423BN

Overview

The MIC4423BN is a dual low-side MOSFET driver manufactured by Microchip Technology, originally developed under the Micrel brand. It utilizes a Bipolar/CMOS/DMOS process to deliver high peak output currents of 3A for both sourcing and sinking. The device operates within a supply voltage range of 4.5V to 18V and features an inverting logic configuration. Packaged in an 8-pin PDIP format with a 0.300-inch (7.62mm) width, it is designed for robust gate driving applications requiring reliable performance in power electronics systems.

Feature Summary

• Dual channel architecture providing independent control for two low-side MOSFETs
• High current drive capability supporting rapid switching transitions
• Inverting input logic simplifies interface with standard control signals
• Robust BiCMOS construction ensures reliability in demanding environments

Applications

• Low-side MOSFET gate driving in DC-DC converters
• Motor control circuits requiring dual switch management
• Power supply designs utilizing bipolar or CMOS logic interfaces

Procurement Notes

Verify component authenticity carefully as the MIC4423BN is officially obsolete and no longer manufactured by Microchip Technology. Sourced units may originate from older stock or third-party distributors rather than direct factory channels. Confirm date codes and packaging integrity upon receipt to ensure operational reliability, as availability is limited to substitute parts like the MIC4423YN.

Selection Notes

Select this component only if legacy compatibility with existing PCB layouts using 8-pin DIP packages is required. Note that the device is discontinued; engineers should evaluate the MIC4423YN as a direct available substitute. Ensure design requirements align with the 4.5V to 18V operating range and 3A peak current specifications before finalizing procurement plans.

Part Context

The MIC4423BN belongs to the MIC4423/4424/4425 family of highly reliable BiCMOS DMOS buffer/driver/MOSFET drivers. These devices represent higher output current versions compared to the MIC4426/4427/4428 series. Originally produced by Micrel Semiconductor, the product line was acquired by Microchip Technology, which now manages the portfolio despite the discontinuation of specific part numbers like the MIC4423BN.

Replacement Considerations

The MIC4423YN is identified as a direct available substitute for the obsolete MIC4423BN. Verify pinout compatibility and electrical specifications between the legacy part and the replacement before implementation.