CD74HCT4046AM

Overview

The CD74HCT4046AM is a Phase Lock Loop (PLL) integrated circuit manufactured by Texas Instruments, originally part of the Harris Corporation product line. It operates within a supply voltage range of 4.5V to 5.5V and supports a maximum frequency of 38MHz. The device is housed in a 16-SOIC package with a width of 0.154 inches (3.90mm). It functions as a single-circuit PLL compatible with the 74HCT series standards.

Feature Summary

• Integrates a linear Voltage-Controlled Oscillator (VCO) for precise frequency generation.
• Includes three distinct phase comparators to support various loop filter configurations.
• Features high-speed CMOS logic technology for improved performance over standard 4000B series devices.

Applications

• Frequency synthesis systems requiring stable clock generation.
• Motor control applications utilizing phase-locked loops for synchronization.
• FM demodulation circuits leveraging the internal VCO characteristics.

Procurement Notes

Verify the manufacturer designation carefully, as this component was historically produced by Harris Corporation before Texas Instruments acquired the logic assets. Confirm that the specific ordering suffix corresponds to the SOIC surface-mount package and HCT logic family requirements for your design.

Selection Notes

Select this variant when a 5V-only supply rail is available, as the HCT series does not support the lower voltages of the HC series. Ensure the PCB layout accommodates the 16-SOIC footprint and that the thermal dissipation requirements are met for operation up to 125°C.

Part Context

This component belongs to the 74HC(T)4046A family, which provides pin-compatible upgrades to the legacy CD4046B. The 'T' suffix specifically denotes High-Speed CMOS Technology with TTL-compatible input levels, distinguishing it from the broader voltage range of the standard HC version.

Replacement Considerations

The CD74HC4046AM serves as a functional equivalent but requires a 5V supply; direct replacement for HC variants may require voltage level adjustment. Verify compatibility with NXP 74HCT4046 or Nexperia equivalents if sourcing from alternative manufacturers.