The Texas Instruments SN74LS138DR is a 3-to-8 line decoder/demultiplexer from the LS series of Schottky-clamped TTL logic devices. It is designed for high-speed digital logic, memory decoding, and data-routing applications.
The device decodes three binary select inputs to select one of eight output lines. It features three enable inputs, including two active-low inputs and one active-high input, simplifying cascading and system logic control. With the appropriate enable configuration, the device can also function as a data demultiplexer.
The SN74LS138DR features fully buffered inputs and Schottky-clamped input structures to support reliable logic signal processing and help suppress signal ringing. Its decoding capabilities make it suitable for digital control systems, memory selection circuits, communication interfaces, and other electronic systems requiring multi-channel logic selection.
This device is supplied in a 16-pin SOIC surface-mount package, making it suitable for compact PCB layouts and electronic equipment manufacturing.
Key Features:
- Brand: Texas Instruments (TI)
- Manufacturer Part Number: SN74LS138DR
- Component Type: 3-to-8 Line Decoder/Demultiplexer
- Logic Family: LS-Series Schottky TTL
- Binary Select Inputs: 3
- Output Channels: 8, active-low
- Enable Inputs: 3 (2 active-low and 1 active-high)
- Package: 16-Pin SOIC (D)
- Mounting Type: Surface Mount (SMD)
- Operating Temperature Range: 0°C to +70°C
- Applications: Memory Address Decoding, Digital Logic Control, Data Routing, and Communication Systems
Before purchasing or integrating this device, consult the official TI datasheet to verify supply requirements, logic levels, propagation delays, and application suitability.
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