Texas Instruments SN74LV139ADBR

Overview

SN74LV139ADBR from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer IC operating from 2 V to 5.5 V, with 7.5 ns maximum propagation delay at 5 V, mixed-mode voltage interface support, and I_off partial-power-down capability. It serves as a high-speed address decoder in memory subsystems and data-routing logic for industrial control and embedded microcontroller peripherals.

For engineers reviewing the SN74LV139ADBR datasheet, SN74LV139ADBR pinout, SN74LV139ADBR application, or SN74LV139ADBR equivalent, this page delivers verified functional identity, SSOP-16 package mapping, confirmed timing and voltage specs, and real-world implementation context - all grounded in TI's official SCLS396J production data sheet (December 2024 revision).

Technical Context

The SN74LV139ADBR integrates two independent 2-to-4 line decoders, each with active-low enable (G) and complementary address inputs (A0/A1), supporting cascading via shared or separate enables. Its fully buffered inputs present only one normalized load, minimizing fanout burden on driving logic.

It implements positive-logic decoding with active-low outputs (Y0–Y3 per channel), operates across –40°C to +85°C, and features I_off circuitry that disables outputs during power-down to prevent backflow current - critical for hot-swap and multi-rail systems.

Key Specifications

Pinout & Package

SN74LV139ADBR uses a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, body size 6.20 mm × 5.30 mm, and overall footprint 6.20 mm × 7.8 mm. Pin 1 is marked by a beveled corner or index area per JEDEC MO-150.

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 74LVC139ADTR, the SN74LV139ADBR offers optimal balance of industrial temperature range, proven SSOP-16 reliability, and guaranteed I_off behavior - making it preferred for legacy-compatible upgrades and mixed-voltage industrial designs where layout stability matters.

Availability

SN74LV139ADBR is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, programmable logic interface, and legacy bus expansion requiring stable component supply and long-term industrial availability.

Supply support for SN74LV139ADBR 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LV139A family is part of TI's LV logic portfolio, designed specifically for high-speed memory decoders and data-transmission systems operating across wide voltage ranges while maintaining low power and robust ESD tolerance.

FAQ

What is the maximum propagation delay of the SN74LV139ADBR at 3.3 V?

The SN74LV139ADBR has a maximum propagation delay of 7.0 ns at V_CC = 3.3 V with 15 pF load, per TI's SCLS396J datasheet Section 4.7. This value reflects worst-case timing across temperature and process variation, ensuring reliable setup/hold margins in 3.3 V systems. The SN74LV139ADBR achieves this performance while maintaining full compatibility with 2 V–5.5 V operation.

Does the SN74LV139ADBR support partial-power-down mode?

Yes, the SN74LV139ADBR supports partial-power-down mode via its I_off circuitry, which limits input/output leakage to less than 5 µA when V_CC = 0 V. This feature prevents damaging current backflow in multi-rail systems and is explicitly validated per JESD78. The SN74LV139ADBR maintains this behavior across its full –40°C to +85°C operating range.

Is the SN74LV139ADBR pin-compatible with older 74LS139 devices?

The SN74LV139ADBR shares identical pinout and truth table with the 74LS139, including active-low enables and outputs, making it a functional drop-in replacement. However, the SN74LV139ADBR operates down to 2 V and offers faster timing (7.5 ns vs. 25 ns), lower power, and I_off protection - enhancements that require no PCB changes but improve system robustness.

What package type does the SN74LV139ADBR use?

The SN74LV139ADBR uses a 16-pin SSOP (Shrink Small Outline Package) with JEDEC MO-150 compliance, designated DB package. Its dimensions are 6.20 mm × 7.8 mm overall, with 0.65 mm lead pitch and 5.30 mm body width. This package offers better thermal performance than TSSOP variants and is widely supported in automated assembly lines.

Can the SN74LV139ADBR interface between 1.8 V and 3.3 V logic domains?

Yes, the SN74LV139ADBR supports mixed-mode voltage operation: its inputs accept voltages down to 0 V and up to 5.5 V regardless of V_CC, enabling direct connection to 1.8 V drivers when powered from 3.3 V. This capability is confirmed in Section 4.3 of the SN74LV139ADBR datasheet and eliminates external level shifters in heterogeneous logic systems.