Texas Instruments 74LVC1G139DCUTG4

Overview

74LVC1G139DCUTG4 from Texas Instruments is a single 2-to-4 line decoder IC with active-low outputs, designed for high-speed memory decoding and data routing in 1.65 V to 5.5 V systems. It features 4.9 ns max propagation delay at 3.3 V/15 pF, ±24 mA output drive at 3.3 V, Ioff support for live insertion, and operates across –40°C to +85°C. It serves as an address decoder in SSD controller logic and embedded memory subsystems.

For engineers reviewing the 74LVC1G139DCUTG4 datasheet, 74LVC1G139DCUTG4 pinout, 74LVC1G139DCUTG4 application, or 74LVC1G139DCUTG4 equivalent, key selection criteria include its VSSOP-8 package footprint, 2-input/4-output active-low decoding function, Ioff-enabled partial-power-down capability, overvoltage-tolerant inputs (up to 5.5 V), and guaranteed timing performance down to 1.65 V supply.

Technical Context

The 74LVC1G139DCUTG4 implements a combinational 2-bit binary decoder where input B is the MSB and all four Y0–Y3 outputs are active-low. Its logic function is fully static CMOS, with matched propagation delays between inverting and non-inverting paths, enabling precise timing alignment in address decode trees.

It supports voltage translation: inputs accept up to 5.5 V independent of VCC, and outputs drive down to VCC level-enabling interoperability between 3.3 V logic and 5 V peripherals. The Ioff circuitry disables outputs when VCC = 0 V, preventing back-drive current during hot-swap or power sequencing.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.5 mm pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G139DCURG4.B, the 74LVC1G139DCUTG4 offers identical performance in a smaller reel format ideal for design validation; versus 74LVC139ADGV, it provides Ioff protection and space savings but lacks dual-channel integration - making it superior for isolated, safety-aware decode nodes.

Availability

74LVC1G139DCUTG4 is available at Aetrix Electronics and suitable for solid-state drives (SSDs), HD television memory subsystems, and enterprise tablet peripheral multiplexing requiring stable component supply and guaranteed long-term sourcing.

Supply support for 74LVC1G139DCUTG4 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 interface and signal-path ICs.

The SN74LVC1G139 product line delivers ultra-small, low-power decoding for memory and peripheral selection in space- and power-constrained embedded systems - targeting SSDs, AV equipment, and portable displays.

FAQ

What is the maximum propagation delay of the 74LVC1G139DCUTG4 at 3.3 V?

The 74LVC1G139DCUTG4 has a maximum propagation delay (tpd) of 4.9 ns at VCC = 3.3 V with CL = 15 pF, as specified in the Switching Characteristics table of the SCES602E datasheet. This value applies to both A→Y and B→Y paths and ensures minimal timing overhead in high-speed memory decode applications.

Does the 74LVC1G139DCUTG4 support partial power-down operation?

Yes, the 74LVC1G139DCUTG4 includes Ioff circuitry that disables all outputs when VCC = 0 V, preventing back-current flow during live insertion or partial-power-down sequences. This feature is explicitly validated per JESD78 Class II latch-up testing and is critical for modular SSD and AV receiver designs.

What package type does the 74LVC1G139DCUTG4 use?

The 74LVC1G139DCUTG4 uses the VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body size, 0.5 mm lead pitch, RoHS-compliant NiPdAu finish, and MSL Level-1 rating. This NanoFree™ package eliminates traditional molding compound, using the silicon die as the structural element.

Can the 74LVC1G139DCUTG4 inputs tolerate 5 V when powered from 3.3 V?

Yes - the 74LVC1G139DCUTG4 inputs are overvoltage tolerant up to 5.5 V regardless of VCC level. When operated at VCC = 3.3 V, inputs A and B safely accept 5 V logic signals, enabling direct interfacing with legacy 5 V peripherals without external level-shifting components.

What is the operating temperature range for the 74LVC1G139DCUTG4?

The 74LVC1G139DCUTG4 is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade requirements. This range is validated across all electrical parameters including propagation delay, output drive, and Ioff behavior, making it suitable for SSDs, HD TVs, and enterprise tablets deployed in varied thermal environments.