74AHCT138PW,118

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT138PW,118 is a high-speed Si-gate CMOS 3-to-8 line decoder/demultiplexer with inverting outputs. 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 three enable inputs: two active LOW (E1, E2) and one active HIGH (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. Packaged in a TSSOP16 plastic thin shrink small outline package (SOT403-1), it is pin compatible with Low power Schottky TTL.

Signal Switches, Multiplexers, Decoders Feature Summary

• Operates with TTL input levels for direct interface compatibility
• All inputs feature Schmitt-trigger action for noise immunity
• Multiple enable inputs allow easy parallel expansion to larger decoders
• Capable of functioning as an eight-output demultiplexer

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Demultiplexing data streams
• Parallel expansion of decoder systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL logic level compatibility is required at 4.5 V to 5.5 V operation. The AHCT variant ensures direct interfacing with TTL sources without additional level shifting. Ensure the design accommodates the specified operating temperature range and utilizes the multiple enable inputs for system expansion if needed.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC/AHCT family of high-speed CMOS logic devices. It is designed to be pin-compatible with Low power Schottky TTL (LSTTL) standards while offering improved speed and lower power consumption characteristics typical of modern CMOS technology.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include other manufacturers' 74AHCT138 variants in TSSOP16 packages. Verify pinout compatibility and electrical specifications against the original datasheet before substitution.

Signal Switches, Multiplexers, Decoders FAQ

How does the 74AHCT138 differ from the 74AHC138?

The 74AHCT138 operates with TTL input levels, allowing direct interface with TTL logic, whereas the 74AHC138 operates with CMOS input levels.

Can this device be used as a demultiplexer?

Yes, it can function as an eight-output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes.