74HC238BQ,115

Overview

The Nexperia 74HC238BQ,115 is a 3-to-8 line decoder and demultiplexer housed in a 16-DHVQFN package. It decodes three binary weighted address inputs (A0, A1, A2) to eight mutually exclusive active HIGH outputs (Y0 to Y7). The device operates on a single power supply ranging from 2.0 V to 6.0 V with an operating temperature range of -40 °C to +125 °C. Propagation delay varies by voltage: 150 ns at 2.0 V, 30 ns at 4.5 V, and 26 ns at 6.0 V. Output drive capability is specified at 5.2 mA for both high and low states.

Feature Summary

• Features multiple enable inputs allowing easy parallel expansion to larger decoding configurations
• Includes input clamp diodes enabling interface to voltages exceeding the supply voltage using current limiting resistors
• Provides demultiplexing capability by utilizing active LOW enable inputs as data strobes

Applications

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

Procurement Notes

Verify the specific ordering suffix matches the required DHVQFN package variant. Confirm RoHS compliance status and moisture sensitivity level requirements against your manufacturing process specifications. Ensure the component meets the necessary ESD protection standards for your assembly environment before finalizing procurement orders.

Selection Notes

Select this part when a compact surface-mount solution is required for 3-to-8 decoding within a wide voltage range. Consider the DHVQFN package dimensions for PCB layout constraints. Verify that the CMOS input levels align with your system logic family, distinguishing it from TTL-compatible HCT variants.

Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices manufactured by Nexperia. It shares functional compatibility with other 74HC238 variants but differs in physical packaging. The BQ suffix specifically denotes the DHVQFN form factor, offering a thermal enhanced very thin quad flat package option compared to standard SO or TSSOP packages.

Replacement Considerations

SN74HCS238BQBR is listed as a substitute part number by Texas Instruments.