Texas Instruments 74LVC2G125DCTRG4

Overview

74LVC2G125DCTRG4 from Texas Instruments is a dual 3-state bus buffer gate IC designed for 1.65-V to 5.5-V operation, featuring two independent noninverting buffers with active-low output-enable controls (1OE, 2OE), ±24-mA drive at 3.3 V, 4.3-ns max propagation delay, and Ioff support for live insertion in partial-power-down systems. It is used in high-speed data acquisition, video infrastructure backplanes, and SSD interconnects.

For engineers reviewing the 74LVC2G125DCTRG4 datasheet, 74LVC2G125DCTRG4 pinout, 74LVC2G125DCTRG4 application, or 74LVC2G125DCTRG4 equivalent, key selection criteria include 5.5-V tolerant inputs, guaranteed 3-state isolation during power sequencing, thermal performance in SM8 package (RθJA = 199.0°C/W), and compatibility with 1.8-V/2.5-V/3.3-V/5-V mixed-voltage logic domains.

Technical Context

The 74LVC2G125DCTRG4 implements two independent noninverting buffer functions (Y = A) with separate active-low 3-state enable controls per channel. Its CMOS input structure accepts voltages up to 5.5 V regardless of VCC, enabling level translation from higher-voltage sources down to the local supply rail.

Each buffer provides balanced push-pull outputs capable of sourcing and sinking equal current (±24 mA at 3.3 V), with defined timing parameters including tpd ≤ 4.3 ns (VCC = 3.3 V, TA = –40°C to +85°C), ten ≤ 4.7 ns, and tdis ≤ 4.6 ns - all specified across full industrial temperature range (–40°C to +125°C).

Key Specifications

Pinout & Package

74LVC2G125DCTRG4 uses the SM8 (DCT) package: 8-pin small-outline package, body size 2.95 mm × 2.80 mm, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 3-state buffer applications.

Compared with SN74LVC2G125DCUR, the 74LVC2G125DCTRG4 offers superior thermal performance in the same 8-pin outline; compared with 74LVC2G126DCTRG4, it provides noninverting logic - making it the correct choice for transparent bus buffering without polarity change.

Availability

74LVC2G125DCTRG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, video broadcasting infrastructure, and military radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC2G125DCTRG4 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 company delivering analog and embedded processing solutions, with leadership in logic, power management, and precision analog technologies.

The SN74LVC2G125 product line delivers ultra-small, low-power, voltage-tolerant dual buffers for mixed-signal system interconnect - targeting space- and power-constrained applications in communications, industrial automation, and computing.

FAQ

What is the maximum operating temperature range for the 74LVC2G125DCTRG4?

The 74LVC2G125DCTRG4 is fully specified from –40°C to +125°C, meeting industrial and extended-temperature requirements. This rating applies across all recommended VCC levels (1.65 V to 5.5 V) and is validated per JESD22-A108. The SM8 package's thermal metrics (RθJA = 199.0°C/W) support reliable operation within this range when PCB layout follows TI's recommended copper pour and via guidelines.

Does the 74LVC2G125DCTRG4 support level translation between different logic families?

Yes, the 74LVC2G125DCTRG4 supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC, allowing 5-V signals to safely drive the device while operating at 1.8 V, 2.5 V, or 3.3 V. However, it does not perform up-translation - outputs swing only between GND and the applied VCC. For bidirectional or up-translation needs, a dedicated level shifter is required.

How should the output-enable (OE) pins be handled during power-up to ensure safe 3-state behavior?

To guarantee high-impedance outputs during power-up/power-down, each OE pin (1OE, 2OE) must be pulled high to VCC via an external resistor. TI recommends a value determined by the driver's sink capability - typically 10 kΩ suffices for most applications. Leaving OE floating risks undefined output states, potential bus contention, and excessive ICC during transition periods.

What is the significance of the Ioff specification for the 74LVC2G125DCTRG4?

The Ioff specification (±10 µA max) defines leakage current when VCC = 0 V. This feature disables all outputs and isolates inputs, preventing damaging back-current flow in live-insertion or partial-power-down scenarios - such as hot-swappable modules or subsystems powered independently. It is a mandatory requirement for designs complying with IEC 61000-4-2 and MIL-STD-704F power sequencing standards.

Can the 74LVC2G125DCTRG4 drive standard LED loads directly?

While the 74LVC2G125DCTRG4 provides ±24-mA output drive at 3.3 V - sufficient for many indicator LEDs - it is not optimized for continuous LED current sinking/source. Its primary design intent is logic-level buffering, not power switching. For LED driving, dedicated constant-current drivers or series resistors sized for worst-case VCC and forward voltage are required to stay within absolute maximum ratings (±50 mA per output, ±100 mA total device current).