74HCT238DB,118

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74HCT238DB,118 is a 3-to-8 line decoder and demultiplexer belonging to the HCT logic family. It decodes three binary weighted address inputs (A0, A1, A2) into eight mutually exclusive active HIGH outputs (Y0 to Y7). The device includes three enable inputs: E1 and E2 are active LOW, while E3 is active HIGH. All outputs remain LOW unless E1 and E2 are LOW and E3 is HIGH. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The component is housed in a 16-lead SO plastic small outline package (SOT109-1).

Signal Switches, Multiplexers, Decoders Feature Summary

• Features multiple input enables for easy parallel expansion to larger decoding configurations.
• Includes clamp diodes on inputs to allow interfacing with voltages exceeding VCC using current limiting resistors.
• Provides demultiplexing capability by utilizing one active LOW enable input as data input and remaining enables as strobes.

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Demultiplexing applications
• Parallel expansion to 1-of-32 decoders

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible input levels are required for CMOS logic systems. The HCT series ensures compatibility with standard TTL devices while offering CMOS low power dissipation. Ensure the design accommodates the specified 4.5 V to 5.5 V supply voltage range and the thermal derating requirements for the SO16 package above 110 °C.

Signal Switches, Multiplexers, Decoders Part Context

This part is part of the 74HC/HCT238 family of 3-to-8 line decoders and demultiplexers manufactured by Nexperia. It shares functional characteristics with the 74HC238 variant but differs in input voltage level specifications, adhering to TTL standards rather than CMOS levels. The family offers multiple package options including TSSOP and DHVQFN.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.