SN74HCT139PWT

Overview

The SN74HCT139PWT is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It operates on a single power supply ranging from 4.5V to 5.5V and features TTL-compatible inputs. The device provides two independent decoders, each with two address inputs and four active-low outputs. It utilizes a 16-pin TSSOP package designed for surface-mount applications. The component supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Dual independent decoding circuits within a single package
• TTL-compatible input logic levels for direct interfacing
• Active-low output states for precise signal selection

Applications

• Address decoding in microprocessor systems
• Data routing and demultiplexing tasks
• Memory chip select generation

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and environmental compliance. Ensure the ordering part number matches the required TSSOP configuration and temperature grade. Cross-reference manufacturer datasheets to validate pinout compatibility before integration into final designs.

Selection Notes

Select this component when TTL-compatible logic interfaces are required alongside CMOS performance characteristics. The dual-channel architecture reduces board space compared to single-decoder alternatives. Verify that the 5V supply voltage aligns with the system design requirements and that the TSSOP footprint fits the available PCB layout constraints.

Part Context

This device belongs to the SN74HCT series of high-speed CMOS logic products. It serves as a functional equivalent to other industry-standard dual decoders but offers specific Texas Instruments manufacturing attributes. The HCT designation indicates compatibility with standard TTL logic families while maintaining CMOS power efficiency.

Replacement Considerations

SN74HC139PWT: Similar function but lacks TTL-compatible input thresholds.