74AHCT138PW-Q100J

Signal Switches, Multiplexers, Decoders Overview

The Nexperia 74AHCT138PW-Q100J 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. The component is housed in a TSSOP16 plastic thin shrink small outline package (SOT403-1).

Signal Switches, Multiplexers, Decoders Feature Summary

• Automotive product qualification in accordance with AEC-Q100 Grade 1.
• All inputs feature Schmitt-trigger action for improved noise immunity.
• Inputs accept voltages higher than the supply voltage (VCC).
• Multiple input enable configuration allows easy parallel expansion.

Signal Switches, Multiplexers, Decoders Applications

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

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix matches the required package variant and temperature grade. Confirm the automotive qualification status aligns with project requirements. Ensure compatibility with existing PCB footprint specifications for the TSSOP16 package. Cross-reference the datasheet revision date against manufacturing records to ensure current production standards.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring TTL-compatible logic levels within an automotive environment. The AHCT series ensures compatibility with standard TTL input thresholds while offering CMOS performance. Verify that the operating voltage range meets the system's power supply constraints. Consider the thermal dissipation characteristics relative to the ambient temperature limits specified in the recommended operating conditions.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC_AHCT138-Q100 family of 3-to-8 line decoders and demultiplexers. It is pin-compatible with Low Power Schottky TTL (LSTTL) devices. The family includes variants such as the 74AHC138-Q100 for CMOS input levels and other package options like SO16 and DHVQFN16. All variants share the same functional logic and automotive qualification standards.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Direct substitutes include the 74AHC138PW-Q100 (CMOS input version) and the 74AHCT138D-Q100 (SO16 package version). Verify electrical parameters and package dimensions before substitution.

Signal Switches, Multiplexers, Decoders FAQ

How does the multiple enable function facilitate expansion?

The device can be expanded to a 1-of-32 decoder by connecting four units in parallel along with one inverter, utilizing the three enable inputs for control.

What is the behavior of the outputs when not selected?

Every output remains HIGH unless the enable inputs E1 and E2 are LOW and E3 is HIGH, at which point the selected output goes LOW.