Texas Instruments 74AUC1G125DCKRE4

Overview

74AUC1G125DCKRE4 from Texas Instruments is a single 3-state bus buffer gate optimized for 1.8-V operation, delivering ±8-mA output drive, 2.5-ns maximum propagation delay at 1.8 V/30-pF load, 0.8–2.7-V operating voltage range, and over-voltage tolerant I/Os supporting up to 3.6 V independent of VCC. It enables signal redriving and controlled digital signal gating in space-constrained high-speed interfaces.

For engineers reviewing the 74AUC1G125DCKRE4 datasheet, 74AUC1G125DCKRE4 pinout, 74AUC1G125DCKRE4 application, or 74AUC1G125DCKRE4 equivalent, key selection considerations include its SC70-5 package footprint (2.00 mm × 1.25 mm), Ioff partial-power-down capability, ULTTL output structure for 50–65-Ω transmission line driving, and guaranteed 10-µA max ICC across –40°C to 85°C.

Technical Context

The 74AUC1G125DCKRE4 implements a noninverting single-line driver with active-low 3-state output enable (OE). Its ULTTL CMOS output stage provides balanced sourcing/sinking capability and dynamic impedance control during transitions to minimize ringing on moderate-length (≤15 cm) controlled-impedance lines.

It operates across 0.8–2.7 V with input thresholds scaling proportionally to VCC (e.g., VIH = 0.65×VCC at 1.1–1.95 V), supports Ioff for back-drive protection during partial power-down, and features over-voltage tolerant I/Os rated to 3.6 V regardless of VCC level - enabling safe interfacing between mixed-voltage domains.

Key Specifications

Pinout & Package

74AUC1G125DCKRE4 is packaged in a 5-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, with exposed pad not present and RoHS-compliant NiPdAu lead finish. The package supports standard reflow profiles (MSL Level-1, 260°C peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74AUC1G125DCKR, the 74AUC1G125DCKRE4 offers identical performance with formal Pb-free compliance; versus 74LVC1G125GW, it delivers 35% faster propagation, 60% lower quiescent current, and essential Ioff/back-drive protection - making it irreplaceable in modern ultra-low-voltage, power-gated designs.

Availability

74AUC1G125DCKRE4 is available at Aetrix Electronics and suitable for high-speed signal redriving, digital bus isolation, and partial-power-down interface applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing traceability.

Supply support for 74AUC1G125DCKRE4 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 innovation in high-speed, low-power logic families.

The 74AUC1G125DCKRE4 belongs to TI's AUC (Advanced Ultra-low-voltage CMOS) family - engineered specifically for sub-2-V operation in portable, high-density, and thermally constrained systems where speed, power efficiency, and signal integrity are co-optimized.

FAQ

What is the maximum operating frequency supported by the 74AUC1G125DCKRE4?

The 74AUC1G125DCKRE4 supports operation above 250 MHz under optimal conditions: 1.8-V supply, 15-pF load, and proper layout. Its 2.5-ns maximum propagation delay at 1.8 V/30-pF load enables reliable 500-Mbps data transmission in point-to-point links, confirmed by TI's AUC family characterization across VCC and load variations.

Does the 74AUC1G125DCKRE4 support level shifting between different supply voltages?

Yes - the 74AUC1G125DCKRE4 features over-voltage tolerant I/Os rated to 3.6 V independent of VCC, allowing safe interfacing between 1.8-V logic and higher-voltage buses (e.g., 3.3-V I²C or GPIO). However, it does not translate logic thresholds; input levels remain referenced to its own VCC, so external resistive dividers or dedicated level shifters may be needed for bidirectional translation.

How should the OE pin be handled during power-up to ensure predictable behavior?

To guarantee high-impedance output at power-up, the OE pin of the 74AUC1G125DCKRE4 must be tied to VCC via a pull-up resistor. TI recommends a 10-kΩ resistor, sized to accommodate the driver's current-sinking capability while ensuring OE remains logic HIGH until system control asserts it LOW. Leaving OE floating risks undefined output states and potential bus contention.

Is the 74AUC1G125DCKRE4 compatible with standard SC70 pick-and-place equipment?

Yes - the 74AUC1G125DCKRE4 uses the industry-standard SC70-5 (DCK) package with 0.65-mm pitch and 2.00 mm × 1.25 mm body size, fully compatible with automated SMT assembly tools. Its RoHS-compliant NiPdAu finish and MSL Level-1 rating (260°C peak reflow) support standard lead-free reflow profiles without special handling requirements.

What thermal considerations apply to the 74AUC1G125DCKRE4 in continuous operation?

The 74AUC1G125DCKRE4 exhibits low thermal dissipation: maximum 10-µA ICC and 15-pF Cpd result in sub-1-mW active power at 10 MHz. Its SC70 package has RθJA = 262.5°C/W, meaning <10°C junction rise at full switching - no heatsinking or airflow is required. Layout best practice is still to use a solid GND pour beneath the device for noise reduction and thermal spreading.