MC74AC138DR2G

Overview

The MC74AC138DR2G is a high-speed CMOS 1-of-8 decoder and demultiplexer manufactured by onsemi. It operates within a supply voltage range of 2 V to 6 V and features three address inputs with eight active-low outputs. The device includes three enable inputs for flexible system control. It is housed in a 16-pin SOIC surface-mount package and supports an industrial operating temperature range from -40 °C to +85 °C.

Feature Summary

• Provides one-of-eight decoding or demultiplexing functionality using three binary address lines.
• Features three enable inputs that allow cascading or system-level power management control.
• Outputs are active-low, providing inverted logic states for direct interface compatibility.

Applications

• Address decoding for memory and I/O port selection in embedded systems
• Demultiplexing data streams to multiple output channels
• Control signal distribution in industrial automation equipment

Procurement Notes

Verify the specific suffix DR2G against the manufacturer's current datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the procurement source provides valid RoHS compliance documentation. Cross-reference the part number with official distributor catalogs to confirm availability status and lead times before finalizing orders.

Selection Notes

Select this component when a single-channel 1-of-8 decoding function is required within the 74AC logic family. It is suitable for designs needing operation between 2 V and 6 V. Consider the SOIC-16 package constraints and verify that the input logic levels match the driving circuitry requirements for reliable switching performance.

Part Context

This part belongs to the MC74AC series of high-speed CMOS logic devices produced by onsemi. The AC series offers improved speed and lower power consumption compared to older HC or HCT variants. The 138 designation specifically identifies the 1-of-8 decoder/demultiplexer topology within this product line.

Replacement Considerations

MC74ACT138DR2G

FAQ

What is the logic state of the outputs?

The outputs are active-low, meaning they assert a low logic level when enabled and selected.

How many address inputs does the device have?

The device utilizes three binary address inputs (A0, A1, A2) to select one of the eight outputs.