Texas Instruments 74LVC1G139DCUTE4

Overview

74LVC1G139DCUTE4 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, ±24-mA output drive, and Ioff support for live insertion. It operates across –40°C to 85°C and is used in low-pin-count address decoding for microcontrollers and FPGAs.

For engineers reviewing the 74LVC1G139DCUTE4 datasheet, 74LVC1G139DCUTE4 pinout, 74LVC1G139DCUTE4 application, or 74LVC1G139DCUTE4 equivalent, key selection criteria include VCC range compatibility (1.65–5.5 V), output drive strength at target voltage, Ioff-enabled partial-power-down behavior, and NanoFree™ US8 package footprint constraints.

Technical Context

This device implements a standard 2-input binary decoder with two active-low select inputs (A, B) and four active-low decoded outputs (Y0–Y3). Its logic function follows the truth table where only one output is asserted low per input combination, with all outputs high when both inputs are high.

It integrates Ioff circuitry that disables outputs during power-down to prevent back-drive current, supports down-translation (inputs tolerate up to 5.5 V regardless of VCC), and exhibits rail-to-rail output swing with VOL ≤ 0.55 V and VOH ≥ VCC – 0.1 V under load.

Key Specifications

Pinout & Package

74LVC1G139DCUTE4 uses the US8 (DCU) package: 1.5-mm × 1.5-mm, 0.5-mm pitch, 8-pin ultra-thin DSBGA with bottom-side solder balls. Pin 1 is marked by a corner fiducial; orientation is top-view as shown in DCU mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G139DCUR and 74LVC1G139DCTTE4, the 74LVC1G139DCUTE4 offers identical core logic and performance in the smallest possible footprint, making it optimal for space-constrained, high-density designs where board area and thermal profile are critical.

Availability

74LVC1G139DCUTE4 is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, FPGA configuration, and low-power subsystem enable applications requiring stable component supply and long-term manufacturability.

Supply support for 74LVC1G139DCUTE4 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 experience in high-reliability interface and signal-path ICs.

The SN74LVC1G139 belongs to TI's LVC logic family, engineered for low-voltage, high-speed operation across mixed-supply systems - specifically targeting compact, power-efficient digital control and routing functions in portable and industrial electronics.

FAQ

What is the maximum operating frequency supported by the 74LVC1G139DCUTE4?

The 74LVC1G139DCUTE4 does not specify a maximum clock frequency because it is a combinational logic device without an internal clock. Its usable speed is determined by propagation delay (max 4.9 ns at 3.3 V) and system-level timing margins. In practice, it reliably supports address decode operations up to ~100 MHz in well-designed PCB layouts with controlled impedance and proper decoupling.

Does the 74LVC1G139DCUTE4 support 1.8-V operation?

Yes, the 74LVC1G139DCUTE4 fully supports 1.8-V operation within its specified 1.65-V to 5.5-V VCC range. At 1.8 V ± 0.15 V, it delivers 4 mA output drive, maintains VIH/VIL thresholds scaled to VCC, and achieves 5.9 ns max tpd with CL = 30 pF - meeting requirements for low-voltage microcontroller and FPGA I/O interfaces.

Can the 74LVC1G139DCUTE4 outputs drive LEDs directly?

No, the 74LVC1G139DCUTE4 outputs are CMOS push-pull and active-low, but they are not designed for direct LED drive. While it can sink up to 24 mA at 3.3 V, sustained LED current requires current-limiting resistors and thermal consideration. More critically, its outputs lack constant-current regulation or built-in protection - use a dedicated LED driver or add series resistance and verify thermal derating per application conditions.

Is the 74LVC1G139DCUTE4 pin-compatible with older 74-series decoders like the 74HC139?

No, the 74LVC1G139DCUTE4 is not pin-compatible with through-hole or standard SOIC 74HC139. It is a single-channel, 8-ball DSBGA device with different pinout (A/B/Y0–Y3/VCC/GND), whereas 74HC139 is a dual 2-to-4 decoder in 16-pin packages. Functional equivalence exists at the logic level, but PCB layout and routing must be redesigned for the US8 footprint and ball map of the 74LVC1G139DCUTE4.

What does the "E4" suffix indicate in 74LVC1G139DCUTE4?

The "E4" suffix in 74LVC1G139DCUTE4 denotes TI's green RoHS-compliant packaging: lead-free, bromine-free, and antimony-free (Green, per TI's eco-plan definition). It also indicates tape-and-reel packaging with a 250-unit quantity, moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH), and CU-NiPdAu terminal finish - confirming suitability for lead-free reflow processes.