CD74HCT42E

Overview

The CD74HCT42E is a high-speed CMOS logic device functioning as a 1-of-10 BCD to decimal decoder. It accepts four binary-coded decimal inputs and activates one of ten active-high outputs corresponding to the decoded input state. The component operates within a supply voltage range of 4.5 V to 5.5 V, ensuring compatibility with standard HCT logic families. It features balanced propagation delay and transition times while offering significant power reduction compared to LSTTL standards. The device is housed in a 16-pin PDIP package suitable for through-hole mounting.

Feature Summary

• Performs binary-coded decimal to decimal decoding with active-high output selection
• Operates at high speeds with balanced propagation delays and transition times
• Provides substantial power savings relative to Low-power Schottky TTL technologies

Applications

• Digital display decoding systems
• Control logic for sequential circuits
• Address decoding in memory architectures

Procurement Notes

Verify the specific suffix 'E' indicates the PDIP-16 package configuration. Confirm RoHS compliance status via the manufacturer's official documentation. Ensure the operating environment remains within the specified -55°C to +125°C temperature range. Validate that input signals adhere to the HCT logic level requirements for reliable operation.

Selection Notes

Select this component when a single-channel BCD to decimal conversion is required. It is appropriate for designs needing active-high outputs and through-hole integration. Consider alternative packages if surface-mount technology is preferred. Ensure the system voltage strictly maintains the 4.5 V to 5.5 V operational window.

Part Context

This part belongs to the Texas Instruments CD74HCT series of high-speed CMOS logic devices. The series is designed to interface directly with TTL logic systems while providing improved speed and lower power consumption. The CD74HCT42 specifically addresses decoding applications requiring ten distinct output lines from four input bits.

Replacement Considerations

The CD54HC42 and CD74HC42 are functional equivalents within the same family, though they differ in voltage ranges and commercial/industrial temperature specifications. Verify pinout compatibility before substitution.