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Product Detailed Parameters
- Description：IC DECODER/DEMUX 1X3:8 16DIP
- Series：74LS
- Mfr：Texas Instruments
- Package：Tube
- Type：Decoder/Demultiplexer
- Circuit：1 x 3:8
- Independent Circuits：1
- Current - Output High, Low：400µA, 8mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：4.75V ~ 5.25V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Through Hole
- Package / Case：16-DIP (0.300", 7.62mm)
- Supplier Device Package：16-PDIP
- Grade：-
- Qualification：-
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Overview
The SN74LS138N is a 3-line to 8-line decoder/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0°C to +70°C. The device features three address inputs (A, B, C) and eight active-low outputs (Y0-Y7). It includes three enable inputs: two active-low (G1A, G2B) and one active-high (G2A), which control the decoding function. The component is housed in a 16-pin PDIP package.
Feature Summary
- Provides logic decoding for three binary address lines into eight distinct active-low output channels
- Incorporates three independent enable inputs to manage chip activation states
- Delivers high current sink capability suitable for direct LED or indicator driving
Applications
- Memory address decoding systems
- Data routing and distribution circuits
- Industrial control logic interfaces
Procurement Notes
Verify that the ordering suffix 'N' corresponds to the 16-lead Plastic Dual In-Line Package (PDIP). Confirm the RoHS status matches project requirements, as indicated by the NIPDAU lead finish. Ensure the specified operating temperature range aligns with the intended environmental conditions.
Selection Notes
Select this component when TTL-compatible logic levels are required for system integration. Consider the specific pinout configuration of the PDIP package for through-hole mounting constraints. Evaluate the power dissipation characteristics against the thermal management capabilities of the target printed circuit board design.
Part Context
This part belongs to the standard SN74LS series of logic devices. It serves as a foundational building block for digital systems requiring signal demultiplexing or address selection functions. The LS technology offers a balance between speed and power consumption compared to other logic families.
Replacement Considerations
SN74LS138D
FAQ
What is the logic state of the outputs when enabled?
When the enable inputs are satisfied, the selected output goes low while all other outputs remain high.
How many enable pins does the SN74LS138N have?
The device has three enable pins: two active-low inputs and one active-high input.
