74HCT123D/AUJ

Multivibrators Overview

The 74HCT123D/AUJ is a dual retriggerable monostable multivibrator with reset, manufactured by Nexperia. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The device features Schmitt-trigger inputs for noise immunity and includes clamp diodes for interfacing voltages exceeding VCC. Pulse width is programmed via external components REXT and CEXT, allowing extension through retriggering or immediate termination via the direct reset input.

Multivibrators Feature Summary

• Dual retriggerable monostable multivibrator architecture
• Schmitt-trigger action on nA and nB inputs
• Direct reset capability to terminate output pulses
• Input clamp diodes for high-voltage interfacing

Multivibrators Applications

• Timing pulse generation
• Debouncing switches
• Pulse widening circuits

Multivibrators Procurement Notes

Verify that the ordering suffix AUJ corresponds to the specified package variant in official Nexperia documentation. Confirm RoHS compliance status and ensure the component meets the required operating temperature range specifications before finalizing procurement decisions.

Multivibrators Selection Notes

Select this component when TTL-compatible logic levels are required for triggering inputs. Ensure external timing resistor and capacitor values fall within the recommended operating conditions to maintain signal integrity and meet propagation delay requirements.

Multivibrators Part Context

This part belongs to the 74HCT series of high-speed Si-gate CMOS devices. It is pin compatible with Low-power Schottky TTL (LSTTL) standards. The device complies with JEDEC standard no. 7A and offers latch-up performance exceeding 100 mA per JESD 78 Class II Level B.

Multivibrators Replacement Considerations

Check for equivalent parts such as SN74AHCT123ADBR from Texas Instruments. Verify functional compatibility and pinout alignment before substitution.

Multivibrators FAQ

How is the output pulse width determined?

The basic output pulse width is programmed by the selection of external resistor (REXT) and capacitor (CEXT) components.

Can the output pulse be extended after triggering?

Yes, the basic pulse width may be extended by retriggering either of the edge triggered inputs (nA or nB).