MM74HC123AMX

Overview

The MM74HC123AMX is a dual retriggerable monostable multivibrator manufactured by onsemi, utilizing advanced silicon-gate CMOS technology. It operates within a supply voltage range of 2V to 6V and features Schmitt trigger inputs for slow rise/fall times. The device provides two independent circuits in a 16-lead SOIC package with tape and reel packaging. Key electrical characteristics include a typical propagation delay of 25 ns, maximum quiescent current of 80 µA, and output drive capability for 10 LS-TTL loads.

Feature Summary

• Retriggerable operation allows pulse extension when triggered during the timing cycle
• Schmitt trigger inputs accommodate slow signal transitions up to one second
• CMOS construction ensures low power consumption and high noise immunity
• Simple external RC timing network determines output pulse width

Applications

• Pulse generation and shaping
• Timing delays
• Debouncing switches
• Frequency division

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm RoHS compliance status via official documentation. Ensure storage conditions meet moisture sensitivity level requirements. Validate pinout compatibility with existing PCB layouts before integration.

Selection Notes

Select this component for applications requiring precise timing control with minimal power consumption. Consider the wide operating temperature range for industrial environments. Evaluate the need for retriggerable functionality versus non-retriggerable alternatives based on system requirements.

Part Context

This part belongs to the 74HC logic family, offering speed comparable to low-power Schottky TTL while maintaining CMOS advantages. The MM74HC123A variant specifically provides dual monostable multivibrators in a single package, suitable for space-constrained designs requiring multiple timing functions.

Replacement Considerations

Direct substitutes include SN74AHC123AN from Texas Instruments. Verify pinout compatibility and electrical specifications match original design requirements before substitution.