74HCT423BQ,115

Overview

The 74HCT423BQ,115 is a dual retriggerable monostable multivibrator with reset, manufactured by NXP USA Inc. It operates within a supply voltage range of 4.5 V to 5.5 V and features Schmitt-trigger inputs for noise immunity. The device provides two independent channels, each capable of generating precise output pulses controlled by external timing components. It supports both positive and negative edge triggering and includes a direct reset function to terminate pulses immediately. Packaged in a DHVQFN16 (SOT763-1) leadless format, it ensures compatibility with Low Power Schottky TTL logic levels.

Feature Summary

• Dual retriggerable monostable multivibrator architecture enabling extended pulse generation up to 100% duty factor
• Schmitt-trigger action on trigger inputs to tolerate slow rise and fall times
• Direct active LOW reset input allows immediate termination of the output pulse
• ESD protection exceeding 2000 V under Human Body Model and 200 V under Machine Model standards

Applications

• Pulse width modulation circuits requiring adjustable duration control
• Timing delay generation for sequential logic operations
• Debouncing switches or sensors to eliminate signal bounce artifacts
• Frequency division and pulse stretching applications

Procurement Notes

Verify the specific ordering suffix '115' corresponds to the DHVQFN16 package variant SOT763-1. Confirm that the required operating temperature range aligns with the -40 °C to +125 °C specification defined for this part number. Ensure external timing components are selected within the recommended resistor and capacitor limits to maintain accurate pulse width performance.

Selection Notes

Select this component when HCT logic level compatibility is required alongside CMOS power efficiency. The DHVQFN16 package is suitable for space-constrained PCB layouts. Consider the retriggerable feature if continuous pulse extension is necessary. Verify that the external timing network can support the desired pulse width range without exceeding power dissipation limits.

Part Context

This device belongs to the 74HCT series of high-speed Si-gate CMOS logic devices. It is pin-compatible with Low Power Schottky TTL (LSTTL) standards. Unlike the 74HC423 variant, the HCT version is optimized for 5 V operation with specific input voltage thresholds. It shares functional similarities with the 74HC123 but lacks triggering capability via the reset input.

Replacement Considerations

The 74HC423BQ,115 serves as a logical alternative for designs not strictly requiring HCT input thresholds. Other packages such as SO16 or SSOP16 may be considered if surface mount footprint constraints differ.