CD74HCT238PW

Overview

The CD74HCT238PW is a high-speed CMOS logic device manufactured by Texas Instruments, functioning as a 3-to-8 line decoder and demultiplexer. It belongs to the HC/HCT logic family and features three binary address inputs (A0, A1, A2) that select one of eight outputs based on the input code. The device operates within a supply voltage range of 2V to 6V and supports surface-mount installation in a TSSOP-16 package. It includes two active-low enable inputs and one active-high enable input for cascading control.

Feature Summary

• Provides decoding or demultiplexing functionality with three binary address inputs controlling eight distinct output lines.
• Features three enable inputs (two active-low, one active-high) to facilitate system expansion and cascaded configurations.
• Designed for high-speed operation with propagation delays comparable to low-power Schottky TTL logic while maintaining CMOS power efficiency.

Applications

• Memory address decoding in digital systems
• Data routing and distribution networks
• I/O port selection circuits

Procurement Notes

Verify the specific suffix 'PW' confirms the TSSOP-16 package type during sourcing. Confirm the HCT designation ensures compatibility with standard 5V logic levels if interfacing with legacy components. Check current lifecycle status as older logic families may face obsolescence risks.

Selection Notes

Select this component when 5V logic compatibility is required alongside high-speed performance. The HCT series is preferred over HC variants for direct interface with LSTTL inputs without level shifting. Ensure the TSSOP-16 footprint matches the PCB layout requirements for surface-mount assembly.

Part Context

This part is part of the CD74HC(T)238 series, which includes non-inverting outputs unlike the CD74HC(T)138 series. It serves as a core logic element for addressing and data distribution tasks in embedded systems and industrial controllers requiring reliable CMOS switching capabilities.

Replacement Considerations

CD74HC238PW: Compatible alternative with HC logic levels instead of HCT; verify voltage compatibility. SN74HCT238PW: Equivalent functional replacement from the same manufacturer with identical specifications.