CD74HCT123M

Multivibrators Overview

The CD74HCT123M is a dual retriggerable monostable multivibrator manufactured by Harris Corporation. It operates within a supply voltage range of 4.5V to 5.5V and features Schmitt trigger inputs on both A and B channels for noise immunity. The device provides separate overrides to terminate output pulses and includes buffered Q and Q outputs. Designed for high-speed CMOS logic, it ensures direct LSTTL input compatibility with defined voltage thresholds. The component is housed in a 16-pin Small Outline Package (SOP) suitable for surface mount applications.

Multivibrators Feature Summary

• Dual retriggerable monostable multivibrators with independent reset controls
• Schmitt trigger inputs on both A and B channels for signal conditioning
• Direct LSTTL input logic compatibility at standard operating voltages
• Buffered Q and Q outputs capable of driving multiple loads

Multivibrators Applications

• Timing pulse generation circuits
• Debouncing switches or contacts
• Frequency division and pulse width modulation
• Delay line implementations

Multivibrators Procurement Notes

Verify the manufacturer origin as Harris Corporation, noting that Texas Instruments has acquired related logic lines. Confirm RoHS compliance status, as older Harris batches may not meet current environmental standards. Ensure the package matches the 16-SOP specification and validate the HCT logic family designation against HC variants to guarantee correct voltage threshold compatibility.

Multivibrators Selection Notes

Select this component when dual independent timing channels are required within a single package. The HCT series is appropriate for systems interfacing directly with LSTTL logic levels without additional level shifting. Verify that the external RC timing components can support the desired pulse width range. Consider the operating temperature range of -55°C to 125°C for industrial or military environments.

Multivibrators Part Context

This part belongs to the Harris CD74HCTxxxyy series of high-speed CMOS logic devices. It shares functional similarities with the CD74HC123 but differs in input voltage thresholds to maintain TTL compatibility. The device is part of a broader family including decoders and multiplexers, designed to replace slower bipolar logic families while offering lower power consumption.

Multivibrators Replacement Considerations

CD74HCT123M96 by Texas Instruments serves as a primary equivalent. Other compatible options include Nexperia's 74HCT123D,653. Verify pinout compatibility and electrical specifications before substitution.