Texas Instruments SN74LV1T125DCKRG4

Overview

SN74LV1T125DCKRG4 from Texas Instruments is a single-supply CMOS buffer gate with 3-state output, designed for bidirectional logic-level translation between 1.2 V and 5.0 V domains. It operates across 1.8 V–5.5 V VCC, delivers up to 8 mA output drive at 5 V, supports 50 MHz switching at 3.3 V, and features 5.0 V-tolerant inputs - enabling use in mixed-voltage I/O interfacing for microcontroller GPIO expansion and sensor interface circuits.

For engineers reviewing the SN74LV1T125DCKRG4 datasheet, SN74LV1T125DCKRG4 pinout, SN74LV1T125DCKRG4 application, or SN74LV1T125DCKRG4 equivalent, key selection criteria include its verified up/down translation capability (e.g., 1.8 V ↔ 3.3 V), guaranteed 3-state control timing (tPZH/tPLZ ≤ 6.5 ns at 3.3 V), industrial temperature range (–40°C to 125°C), and SC70-5 package compatibility with space-constrained portable and telecom designs.

Technical Context

The SN74LV1T125DCKRG4 implements an LVxT-family architecture with reduced input thresholds (VIH as low as 0.99 V at 1.8 V VCC) and 5.0 V-tolerant inputs, enabling deterministic up-translation (e.g., 1.8 V input → 3.3 V output at 3.3 V VCC) and down-translation (e.g., 3.3 V input → 1.8 V output at 1.8 V VCC). Its output voltage is strictly referenced to VCC, ensuring compatibility with downstream CMOS loads.

It uses balanced CMOS push-pull outputs with symmetrical sourcing/sinking capability (±8 mA at 5 V), supports 3-state control via active-low OE, and includes internal clamp diodes for ESD robustness (±2000 V HBM). The device is characterized for operation up to 50 MHz at 3.3 V VCC with 15 pF load and exhibits low static supply current (≤10 µA across all VCC).

Key Specifications

Pinout & Package

SN74LV1T125DCKRG4 is packaged in SC70-5 (DCK), a 2.00 mm × 2.10 mm surface-mount package with 0.65 mm pitch and exposed pad not present. Pin 1 is OE (active-low output enable), Pin 2 is input A, Pin 3 is GND, Pin 4 is output Y, and Pin 5 is VCC - matching standard logic pinouts for drop-in replacement of LVC1G125 or AUP1G125 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar level-shifting buffer applications.

Compared with SN74LV1T125DCKRG4, SN74LV1T126DCKRG4 offers identical performance but requires OE polarity adaptation, while SN74LV1T34DCKRG4 sacrifices bus isolation capability for lower complexity - making SN74LV1T125DCKRG4 the optimal choice for shared-data-path and multi-drop applications.

Availability

SN74LV1T125DCKRG4 is available at Aetrix Electronics and suitable for telecom infrastructure, portable electronics, and server management subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LV1T125DCKRG4 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 ICs and power management.

SN74LV1T125DCKRG4 belongs to TI's LVxT family of single-gate logic devices engineered specifically for voltage-level translation in space-constrained, mixed-rail digital systems - targeting portable, telecom, and industrial applications where simplicity, low power, and wide VCC tolerance are essential.

FAQ

What is the maximum operating frequency of the SN74LV1T125DCKRG4?

The SN74LV1T125DCKRG4 is characterized for operation up to 50 MHz at 3.3 V VCC with a 15 pF load. At lower VCC (e.g., 1.8 V), maximum usable frequency drops to 15 MHz due to increased propagation delay (10.5 ns typ). Performance remains stable across –40°C to +125°C, with timing parameters fully specified in the datasheet's Switching Characteristics table.

Does the SN74LV1T125DCKRG4 support bidirectional level translation?

No - the SN74LV1T125DCKRG4 is a unidirectional buffer: input A drives output Y. However, it supports bidirectional *voltage domain translation* (up and down) depending on VCC and input signal levels. For example, at 1.8 V VCC, it translates 3.3 V inputs down to 1.8 V outputs; at 3.3 V VCC, it translates 1.8 V inputs up to 3.3 V outputs - all within a single direction of signal flow.

What is the function of the OE pin on the SN74LV1T125DCKRG4?

The OE (Output Enable) pin on the SN74LV1T125DCKRG4 is an active-low control that places the Y output in high-impedance (3-state) when logic low, and enables normal buffered operation when logic high. This allows multiple SN74LV1T125DCKRG4 devices to share a common bus line without contention, making it suitable for address/data multiplexing and I²C/SPI signal isolation.

Can the SN74LV1T125DCKRG4 operate with a 1.6 V supply voltage?

No - the absolute minimum recommended VCC is 1.6 V per Absolute Maximum Ratings, but the Recommended Operating Conditions specify a minimum of 1.8 V. Electrical characteristics (VIH, VIL, VOH, VOL, drive strength) are only guaranteed from 1.8 V to 5.5 V. Operation below 1.8 V may result in undefined logic behavior or failure to meet timing specifications.

Is the SN74LV1T125DCKRG4 pin-compatible with other SC70-5 logic gates?

Yes - the SN74LV1T125DCKRG4 uses the standard SC70-5 pinout (OE-A-GND-Y-VCC), matching TI's SN74LV1Txx family including SN74LV1T00, SN74LV1T04, and SN74LV1T34. This allows direct PCB footprint reuse across different logic functions (buffer, inverter, NAND) without layout changes, simplifying design iteration and inventory management.