MIC4426BN

Overview

The MIC4426BN is a dual low-side MOSFET driver from the MIC4426/4427/4428 family, fabricated on a BiCMOS/DMOS process. It provides dual inverting outputs with a 1.5A-peak output current capability. The device operates within a 4.5V to 18V supply range and features low quiescent supply current of 4mA at logic 1 input and 400µA at logic 0 input. It switches a 1000pF load in 25ns with matched rise and fall times. The output impedance is 7Ω, with typical delay less than 40ns. Logic-input threshold is independent of supply voltage, and it includes logic-input protection to –5V.

Feature Summary

• Dual inverting output configuration for driving low-side MOSFETs
• High peak output current of 1.5A with 7Ω output impedance
• Fast switching performance with 25ns transition time for 1000pF load
• Logic-input protection to –5V and latch-up protection to >500mA reverse current

Applications

• MOSFET driver applications
• Clock line driver circuits
• Coax cable driver systems
• Piezoelectric transducer drivers

Procurement Notes

Verify component authenticity as the MIC4426BN is obsolete and no longer manufactured by Microchip Technology or Micrel Semiconductor. Confirm availability through authorized distributors offering surplus or new old stock inventory. Ensure the package type matches the required 8-lead Plastic DIP form factor. Check for any cross-reference substitutes if original parts are unavailable.

Selection Notes

Select this component for applications requiring dual inverting low-side MOSFET drive with high peak current capability. Consider the 4.5V to 18V operating range and TTL/CMOS input compatibility. Evaluate the 25ns switching speed and 7Ω output impedance against load requirements. Note that this part is obsolete; verify if alternative packages or updated series components meet design specifications.

Part Context

The MIC4426BN belongs to the MIC4426/4427/4428 family of dual low-side MOSFET drivers. It specifically denotes the dual inverting configuration in an 8-lead Plastic DIP package with an operating temperature range of –40°C to +85°C. This family replaces earlier MIC426/427/428 and MIC1426/1427/1428 devices, offering improved performance through BiCMOS/DMOS fabrication.

Replacement Considerations

Public confirmed substitute part numbers include MIC4426AM (SOIC package) and MIC4426BM (SOIC package). Verify pinout compatibility and package dimensions when transitioning from DIP to SOIC formats.