SN74LS155AN

Overview

The SN74LS155AN is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments 74LS series. It integrates two independent decoders sharing common address inputs within a single package. The device utilizes Schottky process technology for high-speed operation and features input clamp diodes to limit high-speed termination effects. It operates with a standard supply voltage range of 4.75 V to 5.25 V and supports through-hole mounting in an 18-pin DIP configuration.

Feature Summary

• Dual decoder architecture with shared address lines
• Schottky process for enhanced switching speed
• Input clamp diodes for signal integrity

Applications

• Address decoding in microprocessor systems
• Data demultiplexing applications
• Function generator circuits

Procurement Notes

Verify the manufacturer marking matches Texas Instruments specifications. Confirm the suffix 'AN' indicates the 18-pin plastic DIP package. Ensure the component meets the required logic family standards for your specific circuit design requirements.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required within a compact footprint. The shared address input simplifies wiring compared to using separate single decoders. Verify that the operating voltage aligns with the 5V logic system constraints.

Part Context

This part belongs to the 74LS (Low-power Schottky) logic family, known for balancing power consumption and speed. It serves as a direct replacement for similar dual decoders from other manufacturers like Motorola or Fairchild, maintaining pin compatibility and logical functionality across the industry standard.

Replacement Considerations

Compatible substitutes include the SN54LS155J for military temperature ranges. Other equivalents such as the MC74LS155P or HD74LS155P offer identical logical functions and pinouts for cross-manufacturer sourcing.