SN74ALS156DRE4

Overview

The SN74ALS156DRE4 is a dual 1-of-4 decoder/demultiplexer from Texas Instruments' ALS logic family. It features two independent circuits, each decoding two binary select inputs to activate one of four open-collector outputs. The device operates on a single 4.5V to 5.5V supply within a 0°C to 70°C temperature range. Key electrical parameters include a maximum high-level output current of -0.1 mA and a low-level output current of 8 mA. It is housed in a 16-SOIC surface-mount package.

Feature Summary

• Dual independent 1-of-4 decoding functionality
• Open-collector output configuration for flexible interfacing
• High-speed ALS logic performance

Applications

• Data routing and demultiplexing in digital systems
• Address decoding for memory or I/O selection
• Control signal distribution in industrial equipment

Procurement Notes

Verify the specific RE4 suffix against the manufacturer's latest documentation to confirm compliance with RoHS directives and halogen-free requirements. Ensure the SOIC-16 package dimensions match the target PCB footprint. Confirm that the open-collector outputs are compatible with the downstream circuitry voltage levels and pull-up resistor configurations required by the application design.

Selection Notes

Select this component when dual independent demultiplexing is required with open-collector outputs. The ALS series offers a balance of speed and power consumption suitable for general-purpose logic applications. Verify that the 4.5V to 5.5V operating voltage aligns with the system power supply. Consider the thermal characteristics and package size constraints when integrating into the final assembly.

Part Context

This part belongs to the SN74ALS156 family of decoders and demultiplexers. The 'D' indicates a plastic small-outline package, while 'RE4' typically denotes tape-and-reel packaging with specific environmental compliance. It is functionally related to other ALS series logic devices but distinct in its decoding capability and output structure compared to buffers or inverters.

Replacement Considerations

Direct pin-compatible substitutes may include other SN74ALS156 variants with different packaging options such as SN74ALS156N (PDIP) or SN74ALS156DR. Verify that any replacement maintains the same open-collector output specification and ALS logic speed characteristics to ensure circuit compatibility.