Texas Instruments SN74LV139ADR

Overview

SN74LV139ADR from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer operating from 2 V to 5.5 V, with 7.5 ns maximum propagation delay at 5 V, mixed-mode voltage interface support, Ioff partial-power-down capability, and designed for high-speed memory decoding and data-routing systems.

For engineers reviewing the SN74LV139ADR datasheet, SN74LV139ADR pinout, SN74LV139ADR application, or SN74LV139ADR equivalent, this page delivers verified functional modes, SOIC-16 package details, real-world timing behavior across VCC levels, and validated alternative options for memory address decoding and signal demultiplexing in industrial and embedded control designs.

Technical Context

The SN74LV139ADR implements two independent positive-logic 2-to-4 decoders, each with active-low enable (G) and dual address inputs (A0, A1), producing four active-low outputs (Y0–Y3). Its fully buffered inputs present only one normalized load, minimizing driver loading in cascaded or fan-out-critical systems.

It supports mixed-voltage operation across all ports-inputs tolerate up to 5.5 V regardless of VCC-and incorporates Ioff circuitry to block current flow during power-down, meeting JESD17 latch-up requirements (>250 mA). Propagation delay scales predictably with supply voltage: 7.5 ns max at 5 V/15 pF, 11 ns at 3.3 V/15 pF, and 17.6 ns at 2.5 V/15 pF.

Key Specifications

Pinout & Package

SN74LV139ADR is packaged in a 16-pin SOIC (D) with 1.27 mm pitch, 10.4 mm × 7.8 mm body size, and 2.00 mm max height - compatible with standard wave-solder and reflow profiles per Level-1 MSL rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC139DR, SN74LV139ADR offers superior mixed-voltage tolerance and power-down safety; compared with 74LVC139AD,118, it trades marginal speed gain for broader industrial temp stability and TI's long-term supply assurance in SOIC packaging.

Availability

SN74LV139ADR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and FPGA configuration management requiring stable component supply, long-lifecycle support, and SOIC-16 compatibility with existing PCB footprints.

Supply support for SN74LV139ADR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.

The SN74LV139ADR belongs to TI's LV family of low-voltage, high-speed TTL-compatible logic devices, engineered specifically for memory decoding, data routing, and interface bridging in industrial, automotive, and communications equipment.

FAQ

What is the maximum propagation delay of the SN74LV139ADR at 3.3 V supply?

The SN74LV139ADR has a maximum propagation delay of 13 ns at VCC = 3.3 V ± 0.3 V with 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 under recommended operating conditions and reflects worst-case performance across temperature and process variation - critical for timing closure in 3.3 V FPGA or microcontroller address decode paths. The SN74LV139ADR maintains consistent delay scaling across its full 2 V–5.5 V operating range.

Does the SN74LV139ADR support partial-power-down operation?

Yes, the SN74LV139ADR supports partial-power-down operation via its Ioff feature, which disables all outputs and blocks current backflow when VCC = 0 V. This function is explicitly documented in Section 1 (Features) and Section 6.1 (Detailed Description) of the datasheet, and is verified per JESD78 testing. When used in systems with hot-swap capability or multi-rail power sequencing, the SN74LV139ADR prevents damaging current paths between powered and unpowered sections - a key reliability advantage over non-Ioff logic families.

Can the SN74LV139ADR interface safely with 5 V inputs while operating at 2.5 V VCC?

Yes, the SN74LV139ADR accepts input voltages up to 5.5 V on all pins regardless of VCC level - including when VCC = 2.5 V - as confirmed in Section 4.3 (Recommended Operating Conditions) and Section 4.1 (Absolute Maximum Ratings). This mixed-mode voltage capability allows direct connection to 5 V address buses or control signals without external level-shifting components, reducing BOM cost and board area. The SN74LV139ADR maintains full logic functionality and timing specifications under this condition.

What package type is used for the SN74LV139ADR orderable part number?

The SN74LV139ADR uses the SOIC (D) package: 16-pin, 1.27 mm pitch, 10.4 mm × 7.8 mm body size, and 2.00 mm maximum height. This is confirmed in the Package Information table and the PACKAGE OPTION ADDENDUM, where SN74LV139ADR is explicitly listed with "SOIC (D) | 16" and tape-and-reel specifications (2500 units/reel, 16.4 mm reel width). The SN74LV139ADR's D-package footprint matches industry-standard SOIC-16 land patterns and is compatible with automated SMT assembly.

How many independent decoder channels does the SN74LV139ADR contain?

The SN74LV139ADR contains two independent 2-line-to-4-line decoder channels - Channel 1 (pins 1G, 1A0, 1A1, 1Y0–1Y3) and Channel 2 (pins 2G, 2A0, 2A1, 2Y0–2Y3) - as defined in Figure 3-1 (Pin Configuration) and Table 3-1 (Pin Functions) of the datasheet. Each channel operates autonomously with dedicated enable and address inputs, allowing simultaneous or staggered decoding of two separate 2-bit address groups - a core architectural feature enabling compact memory bank selection and peripheral multiplexing in space-constrained designs.