74AHCT138BQ,115

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT138BQ,115 is a high-speed Si-gate CMOS 3-to-8 line decoder/demultiplexer. It accepts three binary weighted address inputs (A0, A1, A2) and provides eight mutually exclusive outputs (Y0 to Y7) that are LOW when selected. The device features two active LOW enable inputs (E1, E2) and one active HIGH enable input (E3). 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 DHVQFN16 package (SOT763-1).

Signal Switches, Multiplexers, Decoders Feature Summary

• Operates with TTL input levels for compatibility with Low power Schottky TTL (LSTTL)
• Includes multiple enable inputs to facilitate easy parallel expansion to larger decoders
• Provides demultiplexing capability by utilizing enable inputs as data inputs and strobes
• Features balanced propagation delays across all signal paths

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Parallel expansion of decoders to 1-of-32 configurations
• Eight-output demultiplexing applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the DHVQFN16 package type and lead-free status. Confirm the logic family designation matches AHCT requirements for TTL-compatible inputs. Ensure the requested quantity aligns with standard factory packaging specifications.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible logic levels are required alongside low power consumption. The device is suitable for designs needing multiple enable inputs for system expansion or demultiplexing functions. Verify that the operating voltage remains within the 4.5 V to 5.5 V range and that the thermal environment supports the specified industrial temperature limits.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHCT138 series of 3-to-8 line decoders and demultiplexers manufactured by Nexperia. It is pin-compatible with LSTTL devices and complies with JEDEC standard No. 7A. The series includes variants such as the 74AHC138 for CMOS inputs and other package options like SO16 and TSSOP16.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the 74AHCT138D,112 and 74AHCT138PW,115 from Nexperia, provided the package type change is acceptable for the design.