74HC238DB,118

Overview

The Nexperia 74HC238DB,118 is a 3-to-8 line decoder and demultiplexer housed in a 16-lead SO plastic small outline package (SOT109-1). It decodes three binary weighted address inputs to eight mutually exclusive active HIGH outputs. The device operates within a supply voltage range of 2.0 V to 6.0 V and supports an ambient temperature range from -40 °C to +125 °C. Propagation delay is specified at 30 ns maximum at 4.5 V. Inputs include clamp diodes for interfacing with voltages exceeding VCC.

Feature Summary

• Features multiple enable inputs allowing easy parallel expansion to larger decoding configurations
• Capable of functioning as an eight-output demultiplexer using active LOW enable inputs as data strobes
• Provides high noise immunity and low power dissipation typical of CMOS technology
• Includes input clamp diodes enabling direct interface to voltages higher than the supply rail

Applications

• Memory chip select decoding
• Demultiplexing digital signals
• Parallel expansion of decoding logic

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current product data sheet to confirm package type and temperature grade. Confirm RoHS compliance status and check for any recent Product Change Notifications regarding assembly sites or material updates before finalizing procurement specifications.

Selection Notes

Select this component when a standard 3-to-8 decoding function is required with wide supply voltage flexibility. Ensure the application utilizes CMOS compatible input levels rather than TTL levels. Verify that the thermal dissipation requirements fit within the SO16 package derating curves for the intended operating environment.

Part Context

This part belongs to the 74HC/HCT238 family of logic ICs manufactured by Nexperia. It serves as a fundamental building block for address decoding and signal routing in digital systems. The 'HC' designation indicates High-speed CMOS technology, distinguishing it from the 'HCT' variant which features TTL-compatible input thresholds.

Replacement Considerations

Cross-reference with other manufacturers offering equivalent 74HC238 devices in SO16 packages. Verify pin compatibility and electrical characteristics match the original design requirements.