SN74AHC123APWR

Overview

The SN74AHC123APWR is a dual retriggerable monostable multivibrator from the Texas Instruments AHC logic family. It operates within a supply voltage range of 2V to 5.5V and supports an operating temperature range of -40°C to +85°C. The device features Schmitt-trigger circuitry on all inputs to accommodate slow transition rates. It utilizes external resistance and capacitance connected to Rext/Cext and Cext pins to program output pulse durations, which can be extended via retriggering or terminated early using the CLR input.

Feature Summary

• Dual independent channels with edge-triggered operation for generating precise timing pulses
• Schmitt-trigger inputs provide jitter-free triggering even with slow signal transitions
• Retriggerable design allows extension of output pulse duration by subsequent trigger events
• Glitch-free power-up reset ensures outputs remain in a defined state during initialization

Applications

• Pulse width generation and timing control circuits
• Frequency division and digital clock signal processing
• Debouncing mechanical switches to eliminate contact bounce noise
• Creating fixed time delays in sequential logic systems

Procurement Notes

Verify the specific package marking HA123A and confirm the TSSOP-16 form factor matches the target PCB footprint. Ensure the component meets the required industrial temperature specifications for the intended environment. Cross-reference the ordering suffix with the manufacturer's latest packaging addendum to confirm material composition and lead finish compatibility with assembly processes.

Selection Notes

Select this component when dual independent timing channels are required within a single integrated circuit. The AHC series offers high-speed performance suitable for modern digital systems while maintaining low power consumption. Verify that the external timing components selected align with the device's recommended resistance and capacitance ranges to ensure accurate pulse duration calculations.

Part Context

This device belongs to the SNx4AHC123A family of dual retriggerable monostable multivibrators manufactured by Texas Instruments. The 'A' designation indicates compliance with military standards where applicable, though the standard commercial version covers the specified temperature range. The PW suffix identifies the 16-pin Thin Shrink Small Outline Package (TSSOP) variant designed for surface-mount applications.

Replacement Considerations

SN74AHC123APWRE4 is a verified equivalent part number offering identical functionality and pinout configuration.