74AHCT138BQ-Q100X

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT138BQ-Q100X 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 DHVQFN16 (SOT763-1), it is qualified to AEC-Q100 Grade 1 for automotive applications.

Signal Switches, Multiplexers, Decoders Feature Summary

• Automotive qualification compliant with AEC-Q100 Grade 1 standards
• Operates with TTL input levels while maintaining CMOS performance
• All inputs feature Schmitt-trigger action for noise immunity
• DHVQFN package includes side-wettable flanks enabling automatic optical inspection

Signal Switches, Multiplexers, Decoders Applications

• Memory chip select decoding
• Demultiplexing data streams using enable inputs as strobes
• Parallel expansion to 1-of-32 decoders using multiple devices

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'X' against the manufacturer's current ordering information to confirm reel packaging specifications. Ensure the design accounts for the DHVQFN16 thermal pad requirements, which must remain floating or connected to GND if soldered. Confirm the operating temperature range aligns with the system's environmental constraints before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible logic levels are required at the inputs but CMOS performance is needed at the outputs. The AHCT series is suitable for systems interfacing with legacy TTL components. Verify that the 4.5 V to 5.5 V supply voltage range matches the target power rail. Consider the DHVQFN package size if space-constrained PCB layouts are necessary.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC/AHCT138-Q100 family of 3-to-8 line decoders and demultiplexers. It shares functional compatibility with other variants like the 74AHC138BQ-Q100, differing primarily in input logic thresholds. The Q100 designation indicates automotive-grade reliability, distinguishing it from standard commercial logic families.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the 74AHCT138D-Q100 (SO16 package) and 74AHCT138PW-Q100 (TSSOP16 package). These alternatives offer identical electrical characteristics and pinouts but differ in physical footprint and thermal dissipation properties.