CD74HC4538E

Multivibrators Overview

The CD74HC4538E is a high-speed CMOS logic dual retriggerable precision monostable multivibrator manufactured by Texas Instruments. It features two independent circuits in a 16-pin SOIC package, operating within a supply voltage range of 2 V to 6 V and an extended temperature range of -55°C to +125°C. The device utilizes Schmitt trigger inputs for noise immunity and offers balanced propagation delays with low power dissipation characteristics typical of advanced silicon-gate CMOS technology.

Multivibrators Feature Summary

• Dual retriggerable precision monostable multivibrators implemented in high-speed CMOS technology
• Schmitt trigger inputs on both positive and negative transition triggers for improved noise immunity
• Retriggerable functionality allowing pulse extension when triggered during output generation
• Wide operating temperature range suitable for demanding industrial environments

Multivibrators Applications

• Pulse width modulation signal generation
• Timing delay circuits requiring precise duration control
• Debouncing switches or contacts in digital systems
• Frequency division and waveform shaping applications

Multivibrators Procurement Notes

Verify the manufacturer designation carefully, as the part number indicates Texas Instruments despite the query specifying Harris Corporation. Confirm the specific suffix 'E' corresponds to the standard commercial/industrial grade variant rather than automotive or military specifications. Ensure the package type matches the required PCB footprint and that RoHS compliance aligns with current assembly standards.

Multivibrators Selection Notes

Select this component when dual independent timing channels are required in a compact surface-mount package. Consider the HC series speed and power trade-offs against HCT or AHC variants if voltage levels or switching speeds differ from system requirements. Verify input compatibility with driving logic families and ensure external resistor-capacitor components support the desired pulse width stability across the full operating temperature range.

Multivibrators Part Context

This device belongs to the 74HC family of high-speed CMOS logic devices, widely used in general-purpose digital electronics. It serves as a direct replacement for older TTL-based monostable solutions while offering lower power consumption and higher noise immunity. The dual configuration allows cost-effective implementation of multiple timing functions within a single integrated circuit package.

Multivibrators Replacement Considerations

Direct pin-compatible substitutes include the MM74HC4538 and SN74HC4538. Alternative packages such as TSSOP (CD74HC4538PWR) offer similar functionality with different physical dimensions. Verify electrical parameters match exactly before substituting manufacturers to ensure timing accuracy and drive capability remain consistent.