SN74LVC139APWT

Overview

The SN74LVC139APWT 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 temperature range of -40°C to +85°C. The device features a maximum propagation delay of 6.2 ns and includes ESD protection exceeding 2000 V via the human-body model. Inputs accept voltages up to 5.5 V, enabling compatibility with 3.3-V or 5-V driving circuits. It is housed in a 16-pin TSSOP package.

Feature Summary

• Dual independent 2-to-4 decoding channels integrated into a single package
• Active-low enable inputs functioning as data lines for demultiplexing applications
• Fully buffered inputs providing one normalized load per input pin
• High noise immunity with latch-up performance exceeding 250 mA per JESD 17

Applications

• Address decoding for memory and I/O port selection
• Demultiplexing digital signals using active-low enable pins
• Mixed-signal translation between 3.3-V and 5-V system environments
• General-purpose binary decoding in low-voltage logic circuits

Procurement Notes

Verify the specific ordering suffix 'T' confirms the small tape-and-reel carrier format (SPQ 250) rather than standard large reels. Confirm the PW package designation matches the required TSSOP footprint dimensions on your PCB layout. Ensure the RoHS status aligns with environmental compliance requirements for your manufacturing region.

Selection Notes

Select this component when designing systems requiring simultaneous dual decoding functions within a compact surface-mount form factor. The LVC series is appropriate for applications demanding operation below 3.3 V while maintaining high-speed switching characteristics. Verify that the 5.5 V tolerant inputs satisfy interface requirements with upstream 5-V logic sources without additional level shifting.

Part Context

This part belongs to the SN74LVC139A family of dual decoders. The 'PW' suffix indicates the TSSOP physical package, while the 'T' suffix specifies the small tape-and-reel packaging quantity. It serves as a low-power CMOS alternative to older logic families, offering improved speed and lower power consumption compared to standard LS or HC counterparts.

Replacement Considerations

SN74LVC139ADBR: Identical logical function and specifications provided in an SSOP package.