SN74ALS138ADB

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS138ADB is a decoder/demultiplexer from the Texas Instruments ALS logic family. It features three address inputs and eight active-low outputs, enabling one of eight lines to be selected based on binary input codes. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting in a SOIC-14 package. It includes two active-high and one active-low enable inputs for system control. The component exhibits a propagation delay of 22 ns and functions reliably across an operating temperature range of 0°C to +70°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding or demultiplexing functionality with three address lines controlling eight distinct output channels.
• Incorporates multiple enable inputs to manage data flow and prevent unintended signal activation during system initialization.
• Utilizes Schottky-clamped bipolar technology to ensure high-speed switching performance and noise immunity.

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor-based memory systems
• Demultiplexing digital signals in industrial control circuits
• Selecting peripheral devices in embedded computer architectures

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix 'DB' against official manufacturer documentation to confirm the exact package variant and tape-and-reel specifications. Ensure compatibility with existing PCB footprints and verify that the active-low output polarity aligns with the target circuit design requirements before finalizing procurement orders.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring precise address decoding or signal distribution using standard TTL-compatible logic levels. Consider the ALS series characteristics for applications demanding faster switching speeds than standard LS logic while maintaining lower power consumption than older ALS variants. Confirm that the available drive current meets the load requirements of connected downstream components.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74ALS138A series of decoders and demultiplexers manufactured by Texas Instruments. The ALS (Advanced Low-power Schottky) designation indicates the use of bipolar transistor technology optimized for improved speed and reduced power dissipation compared to earlier generations. This series is widely utilized in digital electronics for managing complex logic states and signal routing tasks.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the SN74ALS138AN and SN74ALS138NSR. Verify pinout compatibility and electrical parameter equivalence before substituting these parts in existing designs.