CD74HCT242E

Overview

The CD74HCT242E is a quad bus transceiver manufactured by Harris Corporation, belonging to the 74HCT logic series. It features four independent non-inverting transceivers with three-state outputs, designed for high-speed data transfer between buses. The device operates within a supply voltage range of 4.5V to 5.5V and supports output drive currents of 6mA for both high and low states. It is housed in a 14-pin Dual In-Line Package (DIP) with a width of 0.300 inches (7.62mm). The component is rated for an operating temperature range of -55°C to 125°C and exhibits a moisture sensitivity level of 3.

Feature Summary

• Provides four independent bidirectional bus transceivers for efficient data routing
• Features three-state outputs to facilitate multiple source connections on shared buses
• Utilizes HCT CMOS technology for compatibility with TTL logic levels

Applications

• Bus-oriented memory and command/data address registers
• Clock drivers and buffered oscillators
• Bidirectional data bus interfaces in embedded systems

Procurement Notes

Verify the manufacturer origin, as Harris Corporation assets were acquired by Renesas Electronics. Confirm RoHS compliance status, as older Harris batches may not meet current environmental standards. Ensure the package type matches the required 14-DIP specification. Check for authenticity markers to distinguish genuine components from potential counterfeits. Review datasheet revisions to confirm pinout and electrical characteristics align with design requirements.

Selection Notes

Select this component when designing systems requiring isolated bidirectional data paths with high noise immunity. The HCT series ensures direct interface with standard TTL inputs without level shifting. Consider the 14-pin DIP package for prototyping or through-hole manufacturing needs. Evaluate the 6mA drive capability against load requirements to ensure signal integrity over trace lengths.

Part Context

The CD74HCT242E is part of the broader 74HCT family of digital logic integrated circuits produced by Harris Corporation before its semiconductor division was acquired. This specific model serves as a quad bus transceiver, distinct from single-element variants like the CD74HCT646M. It shares functional similarities with industry-standard equivalents but carries the original Harris branding and specifications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-compatibility with standard 74HCT242 equivalents from other manufacturers based on pinout and electrical parameters.