CD74HCT4046AE

Overview

The CD74HCT4046AE is a high-speed CMOS logic phase-locked loop (PLL) integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 4.5V to 5.5V and supports a maximum frequency of 38MHz. The device features a linear voltage-controlled oscillator (VCO) and three distinct phase comparators, enabling flexible loop configurations. Packaged in a 16-pin DIP format with through-hole mounting, it functions reliably across an extended temperature range from -55°C to 125°C. This component is designed for applications requiring precise frequency synthesis and clock recovery using standard TTL-compatible inputs.

Feature Summary

• Integrates a linear voltage-controlled oscillator with low distortion characteristics for stable frequency generation.
• Includes three selectable phase comparators to support various loop filter designs and locking requirements.
• Features signal inputs compatible with direct coupling for large signals or capacitive coupling for small signals.

Applications

• Frequency synthesis in communication systems
• Clock recovery circuits for data transmission
• Motor speed control loops

Procurement Notes

Verify the specific suffix 'AE' confirms the 16-pin PDIP package and commercial/industrial temperature rating. Confirm RoHS compliance status as manufacturing processes may update. Check for lead-free variants such as E4 or G4 suffixes if environmental regulations require them. Ensure the supplier provides original manufacturer documentation to validate authenticity before purchase.

Selection Notes

Select this model when a 5V logic interface is required, as the HCT series ensures TTL compatibility unlike the HC variant. Choose the AE package designation specifically for through-hole PCB assembly needs. Consider the 38MHz maximum frequency limit against system requirements. Verify that the single PLL topology meets the design complexity without needing multiple devices.

Part Context

This component belongs to the 74HCT4046A family of high-speed CMOS logic devices. It maintains pin compatibility with older CD4046B standards while offering significantly faster switching speeds. The HCT designation indicates input levels compatible with standard 5V TTL logic families, facilitating integration into mixed-logic digital systems.

Replacement Considerations

CD74HC4046AE offers identical functionality but requires 2V-6V supply and lacks TTL input compatibility. SN74LV4046A provides similar PLL features with different voltage ranges. CD54HC4046A is available for military-grade temperature specifications.