SN74LVC139AGQNR

Overview

The SN74LVC139AGQNR is a dual 2-line to 4-line decoder/demultiplexer from the SN74LVC139A series. 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 active-low enable inputs that function as data lines in demultiplexing applications. It includes fully buffered inputs compatible with 3.3-V or 5-V driving devices, allowing use as a translator in mixed-voltage systems. Maximum propagation delay is 6.2 ns at 3.3 V.

Feature Summary

• Dual independent 2-to-4 line decoding and demultiplexing circuits
• Fully buffered inputs for mixed 3.3-V/5-V system translation
• Active-low enable inputs usable as data lines
• ESD protection exceeding JESD 22 specifications

Applications

• Address decoding for memory and I/O mapping
• Demultiplexing data streams in digital logic circuits
• Voltage level translation between 3.3-V and 5-V domains
• Chip select generation in embedded systems

Procurement Notes

Verify the GQN package designation matches the required footprint. Confirm the Q suffix indicates automotive qualification if applicable, though standard datasheets may not explicitly detail Q-series parameters without specific automotive documentation. Ensure input voltages do not exceed 5.5 V to prevent damage. Check moisture sensitivity levels for reflow soldering profiles.

Selection Notes

Select this component when low voltage operation down to 1.65 V is required alongside 5-V tolerance. The GQN package offers a compact form factor suitable for space-constrained designs. Consider the maximum propagation delay of 6.2 ns for timing-critical paths. Verify thermal impedance requirements for the specific PCB layout.

Part Context

This part belongs to the SN74LVC139A family of dual decoders. It shares functional compatibility with other LVC series parts but differs in package type (GQN) and potential automotive qualification (Q suffix). It serves as a core logic element for address decoding and signal routing in low-power digital applications.

Replacement Considerations

SN74LVC139AZQNR: Same functionality in Microstar Junior ZQN package.