MC74AC138DTR2

Overview

The MC74AC138DTR2 is a high-speed 1-of-8 decoder/demultiplexer manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and accepts three binary weighted address inputs (A0, A2) to provide eight mutually exclusive active-LOW outputs (O0-O7). The device features multiple input enables for parallel expansion capabilities. It supports output currents of 24 mA and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Demultiplexing capability with active LOW mutually exclusive outputs
• Multiple input enable configuration allows easy parallel expansion
• High-speed operation suitable for memory chip select decoding

Applications

• Bipolar memory chip select address decoding
• Parallel expansion to 1-of-24 or 1-of-32 decoders
• General-purpose demultiplexing applications

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Confirm RoHS compliance status as applicable to the exact part number variant. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability.

Selection Notes

Select this component when a high-speed 1-of-8 decoding function is required within a 2V to 6V logic environment. Consider the TSSOP-16 package for surface-mount assembly constraints. Evaluate the need for multiple input enables if system architecture requires cascading into larger decoding matrices.

Part Context

This device belongs to the 74AC logic family, designed for high-speed CMOS applications. It serves as a standard solution for address decoding in digital systems. The AC series offers improved speed compared to older logic families while maintaining compatibility with standard power supply voltages.

Replacement Considerations

MC74ACT138DTR2 provides TTL-compatible inputs.