Texas Instruments SN74LV139APWRG4

Overview

SN74LV139APWRG4 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, I_off support for partial-power-down mode, and active-low enable inputs enabling cascading in memory and data-routing systems. It serves as a high-speed address decoder in SRAM/Flash subsystems and as a demultiplexer for control signal distribution.

For engineers reviewing the SN74LV139APWRG4 datasheet, SN74LV139APWRG4 pinout, SN74LV139APWRG4 application, or SN74LV139APWRG4 equivalent, this page delivers verified electrical specs, TSSOP-16 package details, functional mode truth table, real-world use cases in memory decoding and bus gating, and two validated alternative parts with documented differences.

Technical Context

The SN74LV139APWRG4 integrates two independent decoders, each accepting two binary address inputs (A0, A1) and one active-low enable (G), producing four active-low decoded outputs (Y0–Y3). Its fully buffered inputs present only one normalized load, minimizing driver loading in fan-out-critical paths.

It supports mixed-mode voltage operation across all ports, enabling interface between 3.3 V logic and 5 V peripherals. The I_off feature disables outputs during power-down, preventing backflow current when V_CC = 0 V - critical for hot-swap and multi-rail systems.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 6.4 mm body size, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1 (260 °C, unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV139APWRG4, SN74HC139DR trades speed and power-down safety for lower cost in legacy 5 V systems, while 74LVC139AD,118 offers superior low-voltage performance but mandates layout revision - making SN74LV139APWRG4 optimal for industrial 2.5–5.5 V mixed-rail applications requiring proven TSSOP-16 fit.

Availability

SN74LV139APWRG4 is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic interfaces, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV139APWRG4 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 connectivity technologies, with over 90 years of innovation in high-reliability logic and interface solutions.

The SN74LV139A series belongs to TI's LV (Low-Voltage) logic family, engineered for high-speed, low-power decoding and demultiplexing in memory subsystems and data-path routing where timing precision and rail flexibility are critical.

FAQ

What is the maximum propagation delay of the SN74LV139APWRG4 at 3.3 V?

The SN74LV139APWRG4 has a maximum propagation delay of 7 ns at V_CC = 3.3 V with 15 pF load, as specified in Section 4.7 of the official datasheet. This value reflects worst-case timing across temperature and process corners, ensuring reliable setup/hold margin in 3.3 V digital systems. The SN74LV139APWRG4 maintains consistent performance down to 2 V, with t_pd increasing to 17.6 ns at that voltage.

Does the SN74LV139APWRG4 support partial power-down mode?

Yes, the SN74LV139APWRG4 supports partial power-down mode via its I_off circuitry. When V_CC = 0 V, all outputs enter high-impedance state with leakage current ≤5 μA, preventing damaging backflow current from live inputs or outputs into the unpowered device. This feature is explicitly tested and guaranteed per JESD78, making SN74LV139APWRG4 suitable for hot-swap and multi-rail power sequencing applications.

What package type is used for the SN74LV139APWRG4?

The SN74LV139APWRG4 uses a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, body dimensions of 5.00 mm × 4.40 mm, and overall package size of 5.00 mm × 6.4 mm. It features NiPdAu lead finish, RoHS compliance, and moisture sensitivity level (MSL) 1 - allowing unlimited floor life and reflow at 260 °C. This compact, surface-mount package supports high-density PCB layouts typical in industrial and portable electronics.

Can the SN74LV139APWRG4 interface directly between 3.3 V and 5 V logic domains?

Yes, the SN74LV139APWRG4 supports mixed-mode voltage operation: inputs accept voltages from 0 V to 5.5 V independent of V_CC, and outputs drive to V_CC levels. When powered at 3.3 V, it safely accepts 5 V inputs and produces 3.3 V outputs - enabling direct 5 V-to-3.3 V level translation without external components. This capability is confirmed in Section 4.3 (Recommended Operating Conditions) and Figure 6-1 (Functional Block Diagram) of the SN74LV139APWRG4 datasheet.

How many enable inputs does the SN74LV139APWRG4 have, and what is their function?

The SN74LV139APWRG4 has two independent active-low enable inputs: 1G (Pin 1) for Channel 1 and 2G (Pin 15) for Channel 2. Each enables its respective 2-to-4 decoder - when asserted low, the decoder responds to address inputs A0/A1; when high, all four outputs (Y0–Y3) go high-impedance. This dual-enable architecture simplifies cascading (e.g., enabling one decoder only when the other is disabled) and supports dynamic data routing in multiplexed control systems.