74HCT238DB,112

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74HCT238DB,112 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 incorporates three enable inputs: E1 and E2 are active LOW, while E3 is active HIGH. 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
• Parallel expansion to 1-of-32 decoders
• Eight output demultiplexing

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix '118' against official Nexperia documentation, as datasheet references indicate 'D' packages without this suffix. Confirm RoHS compliance status and REACH registration details directly with the manufacturer or authorized distributors prior to procurement. Ensure the selected variant matches the required operating temperature range and package specifications for the intended application environment.

Signal Switches, Multiplexers, Decoders Selection Notes

Select the 74HCT238 variant specifically when TTL-level input compatibility is required, as opposed to the HC series which utilizes CMOS levels. Verify that the system design accommodates the specified propagation delays and power dissipation limits. Ensure the application does not exceed the absolute maximum ratings for supply voltage, input/output currents, or total power dissipation to prevent permanent device damage.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the Nexperia 74HCT238 product family, which includes variants such as 74HC238 and 74HCT238. These devices share identical functional descriptions but differ in input logic levels and electrical characteristics. The family offers multiple package options including SO16, TSSOP16, and DHVQFN16 to accommodate various PCB layout requirements and thermal management needs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct pin-to-pin replacements include other manufacturers' 74HCT238 equivalents. Verify that substitute components meet the same JEDEC standards and latch-up performance requirements. Cross-reference package dimensions and thermal characteristics to ensure mechanical compatibility.