Texas Instruments 74LVC2G125DCTRE4

Overview

74LVC2G125DCTRE4 from Texas Instruments is a dual non-inverting bus buffer gate with 3-state outputs, designed for 1.65-V to 5.5-V V_CC operation. It features two independent channels (1A→1Y, 2A→2Y), each controlled by its own active-low output-enable input (1OE, 2OE), supports 5.5-V tolerant inputs, delivers ±24-mA output drive at 3.3 V, and achieves 4.3-ns max propagation delay at 3.3 V - enabling high-speed signal routing in compact logic interfaces.

For engineers reviewing the 74LVC2G125DCTRE4 datasheet, 74LVC2G125DCTRE4 pinout, 74LVC2G125DCTRE4 application, or 74LVC2G125DCTRE4 equivalent, key selection considerations include I_off-enabled partial-power-down capability, NanoFree™ SM8 package compatibility, 3.3-V/5-V mixed-voltage translation support, and precise 3-state timing control for bus isolation in space-constrained embedded systems.

Technical Context

The 74LVC2G125DCTRE4 implements two independent CMOS non-inverting buffers with active-low 3-state control per channel. Each buffer's output enters high-impedance when its corresponding OE input is high, and drives V_CC or GND when enabled - supporting bidirectional bus management without inversion. Its I_off circuitry ensures <±10 µA leakage during power-down, preventing back-drive damage.

Input voltage tolerance extends to 5.5 V regardless of V_CC (1.65–5.5 V), enabling down-translation from higher-voltage domains. Balanced push-pull outputs deliver symmetrical ±24-mA drive at 3.3 V, while fast edge rates (≤10 ns/V input transition) require careful PCB routing to suppress ringing - especially on long traces or unterminated loads.

Key Specifications

Pinout & Package

74LVC2G125DCTRE4 uses the SM8 (DCT) package: 8-pin small-outline package with 2.95 mm × 2.80 mm body size, gull-wing leads, and standard 0.65-mm pitch. Pin 1 is marked with a dot or bevel; orientation follows TI-standard top-view labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125DCUR and 74LVC2G125YZPR, the 74LVC2G125DCTRE4 offers the best balance of manufacturability (gull-wing leads), thermal margin (199.0°C/W), and compatibility with legacy SOIC footprints - making it optimal for cost-sensitive industrial control boards requiring long-term supply stability.

Availability

74LVC2G125DCTRE4 is available at Aetrix Electronics and suitable for industrial motor control interfaces, automotive infotainment bus isolation, high-density SSD controller logic, programmable logic I/O expansion, and compact sensor node designs requiring stable component supply across extended product lifecycles.

Supply support for 74LVC2G125DCTRE4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The SN74LVC2G125 family belongs to TI's LVC logic portfolio - engineered for low-voltage, high-speed, mixed-signal interfacing in space-constrained systems where power efficiency, voltage translation, and robust 3-state control are essential.

FAQ

What is the maximum operating temperature for the 74LVC2G125DCTRE4?

The 74LVC2G125DCTRE4 is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD78 Class II latch-up testing and confirmed in the Recommended Operating Conditions table of the official datasheet (SCES204Q). The device maintains full electrical performance across this range, including guaranteed 4.3-ns propagation delay at 3.3 V and ±24-mA output drive at +125°C.

Does the 74LVC2G125DCTRE4 support level translation between different supply voltages?

Yes, the 74LVC2G125DCTRE4 supports down-translation: its inputs tolerate up to 5.5 V regardless of V_CC, allowing 5-V signals to safely drive the device when powered from 1.8-V, 2.5-V, or 3.3-V supplies. However, it does not perform up-translation - outputs swing only between GND and the applied V_CC. This makes the 74LVC2G125DCTRE4 ideal for interfacing legacy 5-V peripherals with modern low-voltage controllers.

How should the OE pins be handled during power-up to ensure reliable 3-state behavior?

To guarantee high-impedance outputs at power-up, each OE pin (1OE and 2OE) must be tied to V_CC through an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source - TI recommends calculating R_PULLUP ≤ V_CC/I_OH(min) where I_OH(min) is specified in the Electrical Characteristics table. For the 74LVC2G125DCTRE4, a 10-kΩ resistor is typically sufficient for most microcontroller-driven applications.

Is the 74LVC2G125DCTRE4 pin-compatible with other members of the SN74LVC2G125 family?

Yes - all SN74LVC2G125 variants (including DCTRE4, DCUR, YZPR) share identical pin functions and logic behavior. The 74LVC2G125DCTRE4 uses the SM8 (DCT) package with standard 0.65-mm pitch, while DCUR uses VSSOP-8 and YZPR uses DSBGA-8. Mechanical dimensions and soldering methods differ, but signal mapping (1A, 1Y, 1OE, etc.) and electrical timing are fully consistent across all packages.

What is the purpose of the I_off feature in the 74LVC2G125DCTRE4?

The I_off feature disables all inputs and outputs when V_CC = 0 V, limiting leakage current to ±10 µA maximum. This prevents damaging current backflow during partial-power-down states - such as when a peripheral card is hot-plugged into a live backplane or when a subsystem powers down while others remain active. The 74LVC2G125DCTRE4's I_off compliance is verified per JESD78 Class II and is critical for system-level reliability in modular electronics.