SN74LVC139AD

Overview

The SN74LVC139AD is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments LVC logic family. It operates within a supply voltage range of 1.65 V to 3.6 V and supports an operating free-air temperature range of -40 °C to +85 °C. The device features a maximum propagation delay (tpd) of 6.2 ns at 3.3 V. Inputs accept voltages up to 5.5 V, allowing compatibility with 3.3-V or 5-V driving circuits. It provides latch-up performance exceeding 250 mA per JESD 17 and ESD protection exceeding 2000 V per the human-body model.

Feature Summary

• Contains two independent 2-line to 4-line decoders in a single package
• Active-low enable inputs function as data lines for demultiplexing applications
• Fully buffered inputs represent only one normalized load to the driving circuit
• Compatible with mixed 3.3-V/5-V system environments due to 5.5-V input tolerance

Applications

• Address decoding for memory and control signaling
• Demultiplexing data streams using active-low enable inputs
• Translating signals between 3.3-V and 5-V logic domains
• General-purpose digital logic routing

Procurement Notes

Verify that the specific orderable part number matches the required package type, as the SN74LVC139A series includes variants such as AD (SOIC), APW (TSSOP), and ADR (SOIC Reel). Confirm the suffix indicates the correct tube or reel packaging configuration. Ensure the component status is listed as Active production data before finalizing procurement specifications.

Selection Notes

Select this component when a low-voltage CMOS decoder is required for systems operating between 1.65 V and 3.6 V. The device is suitable for designs needing high-speed switching with a maximum tpd of 6.2 ns. Consider its 5.5-V input tolerance if interfacing directly with legacy 5-V logic sources without additional level shifting components.

Part Context

This device belongs to the SN74LVC139A family of dual 2-line to 4-line decoders manufactured by Texas Instruments. It utilizes advanced CMOS technology designed for low-voltage operation while maintaining high noise immunity. The product line offers various package options including SOIC, TSSOP, SSOP, and VQFN to accommodate different board space and thermal requirements.

Replacement Considerations

SN74LVC139ADR serves as a tape-and-reel alternative to the tube-packaged SN74LVC139AD.