SN74LS139D

Overview

The SN74LS139D is a dual 2-line to 4-line decoder/demultiplexer from the LS logic series. It features Schottky clamping for high performance and inverted outputs. The device operates on a 5V supply with a maximum ICC of 11 mA. It supports an operating temperature range up to 70°C and utilizes a 16-pin SOP package.

Feature Summary

• Dual independent decoding circuits within a single package
• Schottky clamped structure for enhanced switching speed
• Inverted output polarity for direct interface compatibility

Applications

• Address decoding in microprocessor systems
• Data demultiplexing applications
• Memory chip select generation

Procurement Notes

Verify the manufacturer designation carefully, as Texas Instruments produces the SN74LS139 variant while onsemi manufactures the MC74ACT139D. Confirm the specific suffix indicates the correct package type and ensure compliance with RoHS standards if required by your design specifications.

Selection Notes

Select this component when low power dissipation is critical compared to standard TTL. Verify that the inverted output logic aligns with downstream circuit requirements. Ensure the 70°C commercial temperature rating meets environmental constraints.

Part Context

This part belongs to the widely adopted 74LS family, known for balancing speed and power consumption. It serves as a foundational logic element for address mapping and signal routing in digital electronics, replacing older standard TTL equivalents with improved efficiency.

Replacement Considerations

The SN74LS139DR is a tape-and-reel version of the same die. Cross-reference with MC74LS139D from other manufacturers for pin-compatible alternatives.