Texas Instruments SN74LVC139ANSR

Overview

SN74LVC139ANSR from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer operating from 1.65 V to 3.6 V, featuring active-low enable inputs, fully buffered inputs, and 6.2 ns max propagation delay at 3.3 V. It supports mixed-voltage interfacing (inputs accept up to 5.5 V) and is used in address decoding, memory selection, and data routing in low-voltage digital systems.

For engineers reviewing the SN74LVC139ANSR datasheet, SN74LVC139ANSR pinout, SN74LVC139ANSR application, or SN74LVC139ANSR equivalent, key selection factors include its 16-pin SOP-NS package, dual independent decoder architecture, 5.5-V-tolerant inputs, latch-up immunity (>250 mA), and compatibility with 3.3-V/5-V system translation.

Technical Context

The SN74LVC139ANSR implements two independent 2-to-4 line decoders with active-low enable (G) inputs that double as data lines in demultiplexing mode. Each decoder uses positive-logic select inputs (A, B) and produces four active-low outputs (Y0–Y3).

Its CMOS LVC-family design ensures rail-to-rail output swing, input voltage tolerance beyond VCC (up to 5.5 V), and low dynamic power consumption - enabling direct interface between 3.3-V logic and legacy 5-V subsystems without level shifters.

Key Specifications

Pinout & Package

SOP-NS package (16-pin, 0.635 mm pitch, 10.4 mm × 5.3 mm body, 2.0 mm max height), compliant with JEDEC MS-012, with gull-wing leads and Pin 1 index area marked on top-side silkscreen.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with SN74LV139ADR and 74AHC139PW, the SN74LVC139ANSR uniquely supports 1.65–3.6 V operation with 5.5-V-tolerant inputs - making it the only option among the three capable of seamless 3.3-V/5-V voltage translation without external components.

Availability

SN74LVC139ANSR is available at Aetrix Electronics and suitable for memory address decoding, peripheral selection logic, bus multiplexing, and LED segment driver control requiring stable component supply and long-term industrial availability.

Supply support for SN74LVC139ANSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-reliability, production-ready logic families.

The SN74LVC139ANSR belongs to TI's LVC (Low-Voltage CMOS) logic portfolio, designed specifically for low-power, mixed-voltage digital interfacing in space-constrained industrial, computing, and communications equipment.

FAQ

What is the operating voltage range for the SN74LVC139ANSR?

The SN74LVC139ANSR operates from 1.65 V to 3.6 V. This range supports compatibility with 1.8-V, 2.5-V, and 3.3-V logic systems. Operation outside this range - including at 5 V on VCC - is not permitted, though inputs tolerate up to 5.5 V regardless of VCC level. The SN74LVC139ANSR must be powered within its specified VCC window to ensure correct logic thresholds and output drive capability.

Does the SN74LVC139ANSR support 5-V input signals?

Yes, the SN74LVC139ANSR inputs accept voltages up to 5.5 V, independent of VCC level - enabling direct interface with 5-V TTL or CMOS outputs in mixed-voltage systems. This feature eliminates external level shifters when connecting to legacy 5-V peripherals. The SN74LVC139ANSR maintains full functionality and timing specifications under this condition, provided VCC remains within 1.65–3.6 V.

What is the maximum propagation delay of the SN74LVC139ANSR?

The maximum propagation delay (tpd) of the SN74LVC139ANSR is 6.2 ns at VCC = 3.3 V and TA = 25°C. At lower VCC (e.g., 1.8 V), tpd increases to 20.6 ns. This parameter applies to both A/B → Y and G → Y paths. The SN74LVC139ANSR delivers predictable, low-latency decoding critical for real-time address selection and synchronous data routing.

How is the SN74LVC139ANSR packaged, and what are its mechanical dimensions?

The SN74LVC139ANSR uses a 16-pin SOP-NS package (JEDEC MS-012), with 0.635 mm lead pitch, 10.4 mm × 5.3 mm body size, and 2.0 mm maximum height. It features gull-wing leads and a Pin 1 index area. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). The SN74LVC139ANSR is supplied in tape-and-reel format (2000 units/reel).

Can the SN74LVC139ANSR be used as a demultiplexer?

Yes - each section of the SN74LVC139ANSR can function as a 1-to-4 demultiplexer by using the active-low enable (G) input as the data line and A/B as select lines. When G is low, the selected Y output mirrors the G state (i.e., low); all others remain high. This behavior is explicitly supported in the device's functional description and timing diagrams. The SN74LVC139ANSR thus serves dual roles without external logic.