Texas Instruments SN74LV139ANSR

Overview

SN74LV139ANSR from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer operating from 2 V to 5.5 V, delivering 7.5 ns maximum propagation delay at 5 V, supporting mixed-mode voltage operation across all ports, and incorporating two active-low enable inputs for cascading or data routing in memory and data transmission systems.

For engineers reviewing the SN74LV139ANSR datasheet, SN74LV139ANSR pinout, SN74LV139ANSR application, or SN74LV139ANSR equivalent, this page provides verified functional modes, SOP-16 package mapping, Ioff-enabled partial-power-down capability, and confirmed timing parameters across 2.5 V/3.3 V/5 V supply conditions - critical for high-speed address decoding and signal demultiplexing in industrial and embedded control designs.

Technical Context

The SN74LV139ANSR implements two independent positive-logic 2-to-4 decoders with fully buffered inputs and active-low enable (G) per channel. Each decoder accepts two address bits (A0, A1) and asserts one of four low-active outputs (Y0–Y3) when enabled.

It features Ioff circuitry that disables outputs during power-down to prevent backflow current, supports 2 V–5.5 V VCC operation with VIH/VIL thresholds scaling with supply voltage, and maintains specified tpd down to 2.5 V (max 21 ns at CL = 15 pF), enabling interoperability across mixed-voltage logic domains.

Key Specifications

Pinout & Package

SOP-16 (NS) package: 10.2 mm × 7.8 mm body size, 2.00 mm max height, gull-wing leads, pin 1 index area marked, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC139DR and 74LVC139AD, SN74LV139ANSR uniquely combines SOP-16 packaging, guaranteed 7.5 ns max delay at 5 V, and Ioff - making it the only option among the three qualified for mixed-voltage hot-swap and industrial timing-critical decoding.

Availability

SN74LV139ANSR is available at Aetrix Electronics and suitable for industrial control panels, embedded memory subsystems, and programmable logic interface modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOP packaging.

Supply support for SN74LV139ANSR 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 industrial and automotive-grade components.

The SN74LV139A product line targets high-speed memory decoding and data-routing applications, designed specifically to minimize system-level propagation delay while maintaining robust DC and AC performance across wide voltage and temperature ranges.

FAQ

What is the maximum propagation delay of the SN74LV139ANSR at 3.3 V supply?

The SN74LV139ANSR has a maximum propagation delay of 13 ns at VCC = 3.3 V ± 0.3 V with a 15 pF load, as specified in Section 4.7 of the official datasheet. This value applies to transitions from address or enable inputs to any Y output and is measured at TA = 25 °C. The SN74LV139ANSR maintains consistent timing across its full operating temperature range (–40 °C to +85 °C), with worst-case delay increasing to 16.5 ns at 50 pF load.

Does the SN74LV139ANSR support partial-power-down operation?

Yes, the SN74LV139ANSR supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, preventing current backflow from live inputs into the unpowered device. This capability is explicitly verified per JEDEC JESD78 and is critical for systems requiring safe power sequencing or hot-swap functionality - a key differentiator of the SN74LV139ANSR versus older HC-series decoders.

What package type does the SN74LV139ANSR use, and what are its mechanical dimensions?

The SN74LV139ANSR uses the SOP-16 (NS) package with a 10.2 mm × 7.8 mm body size and 2.00 mm maximum height. It features gull-wing leads, pin 1 index marking, and RoHS-compliant NIPDAU lead finish. The package drawing is NS0016A, and tape-and-reel packaging uses 2000-unit reels with 12.0 mm pitch and Q1 pin-1 quadrant orientation - all confirmed in TI's Package Materials Information document dated July 2025.

Can the SN74LV139ANSR interface with both 3.3 V and 5 V logic families simultaneously?

Yes, the SN74LV139ANSR supports mixed-mode voltage operation: its inputs tolerate voltages up to 5.5 V regardless of VCC level, allowing 5 V controllers to drive address and enable signals while the device operates from a 3.3 V supply. Outputs swing rail-to-rail (0 V to VCC), so 3.3 V operation yields 0–3.3 V output levels compatible with downstream 3.3 V receivers - eliminating need for external level translators in hybrid-voltage systems.

What is the recommended bypass capacitor for the SN74LV139ANSR?

Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin (pin 16) of the SN74LV139ANSR, with a low-inductance connection to the GND pin (pin 8). Layout guidelines specify using wide traces, an unbroken ground plane beneath the capacitor, and placement on the same PCB side as the device - all validated in TI's Application Report SLLA303. For enhanced noise suppression, a parallel 1 µF capacitor may be added nearby.