74AC139SJ

Overview

The Fairchild Semiconductor 74AC139SJ is a dual 2-line-to-4-line decoder/demultiplexer belonging to the AC series. It utilizes CMOS technology and features inverted outputs. The device is housed in a 16-lead Small Outline Package (SOP) with a maximum length of 9.9 mm and a maximum height of 1.75 mm. It operates within a supply voltage range of 2.0 V to 6.0 V, supporting a propagation delay of 10.5 ns. The component functions across an industrial temperature range from -40 °C to +85 °C.

Feature Summary

• Dual independent 2-line-to-4-line decoding sections
• CMOS construction for low power consumption
• Inverted output logic states

Applications

• Address decoding for memory arrays
• Demultiplexing data streams
• Control signal distribution in digital systems

Procurement Notes

Verify that the ordering suffix SJ specifically corresponds to the 16-lead SOP package configuration. Confirm the manufacturer designation as Fairchild Semiconductor or its successor entities. Ensure the part meets the required AC series electrical specifications and operating temperature ranges before integration into designs.

Selection Notes

Select this component when dual independent decoding functionality is required within a single package. The AC series offers higher speed performance compared to standard HC variants. Verify that the 16-lead SOP footprint aligns with the available PCB layout space and assembly capabilities.

Part Context

This decoder belongs to the 74AC family of high-speed CMOS logic devices. These components are designed to replace older TTL technologies while providing improved noise immunity and lower power dissipation. The 74AC139 provides two separate decoding channels, allowing efficient management of multiple address lines or control signals in complex digital circuits.

Replacement Considerations

Compatible substitutes include the 74ACT139SJ for TTL-compatible input requirements and the 74HC139SJ for standard speed applications. Verify pinout compatibility and electrical parameter alignment before substitution.