74AHCT138D,118

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT138D,118 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). The device features two active LOW enable inputs (E1, E2) and one active HIGH enable input (E3). Outputs are LOW when selected. It operates with TTL input levels within a supply voltage range of 4.5 V to 5.5 V. The component is housed in an SO16 plastic small outline package (SOT109-1) and supports an operating temperature range from -40 °C to +125 °C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Balanced propagation delays for consistent signal timing
• Schmitt-trigger action at all inputs for noise tolerance
• Demultiplexing capability using enable inputs as data/strobe
• Multiple input enables allowing easy parallel expansion

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 against current Nexperia documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status and environmental declarations prior to integration. Check for any Product Change Notifications (PCN) regarding manufacturing site or material changes that may affect qualification.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible logic levels are required within a 4.5 V to 5.5 V system. Ensure the application utilizes the multiple enable inputs for proper device control or expansion. Verify that the SO16 package dimensions fit the PCB layout constraints and that the thermal dissipation requirements are met within the specified ambient temperature range.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC/AHCT family of high-speed CMOS logic devices. It is pin-compatible with Low Power Schottky TTL (LSTTL) standards. The 'AHCT' designation specifically indicates compatibility with TTL input voltage levels, distinguishing it from the standard 'AHC' variant which uses CMOS levels.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include other manufacturers' 74AHCT138 variants in SO16 packages. Verify functional equivalence regarding enable logic polarity and output states. Ensure replacement parts meet the same JEDEC standards and temperature ratings.