74AHC138D,118

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHC138D,118 is a high-speed Si-gate CMOS 3-to-8 line decoder/demultiplexer housed in a 16-lead SO plastic small outline package (SOT109-1). It accepts three binary weighted address inputs and provides eight mutually exclusive outputs that are LOW when selected. The device features two active LOW enable inputs and one active HIGH enable input. It operates on a single power supply ranging from 2V to 5.5V with an operating temperature range of -40°C to +125°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Balanced propagation delays across all signal paths
• All inputs feature Schmitt-trigger action for noise immunity
• Demultiplexing capability using active LOW enable inputs as data inputs
• Multiple input enable configuration allows easy parallel expansion

Signal Switches, Multiplexers, Decoders Applications

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

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix matches the required package variant. Confirm the voltage logic family corresponds to the system requirements. Check the most recent product status documentation for any changes. Ensure environmental compliance standards meet project specifications. Validate pin compatibility with existing board layouts before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring high-speed decoding within a wide voltage range. The AHC series supports CMOS input levels, distinguishing it from AHCT variants. Verify that the 16-SO package dimensions fit the available PCB space. Consider the thermal dissipation characteristics if multiple units are used in close proximity.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC logic family, which offers high-speed performance comparable to LSTTL but with lower power consumption. It is pin-compatible with Low Power Schottky TTL devices, facilitating direct upgrades or replacements in legacy designs without altering the physical footprint.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the 74AHCT138D,112, though it is obsolete. Alternative sources may offer compatible parts from other manufacturers, but verify electrical parameters and package dimensions carefully.