Texas Instruments SN74LV1T125DCKR

Overview

SN74LV1T125DCKR from Texas Instruments is a single-supply CMOS buffer gate with 3-state output, designed for bidirectional logic-level translation between 1.2 V–5.0 V domains. It operates from 1.8 V to 5.5 V VCC, delivers up to 8 mA output drive at 5 V, supports 50 MHz operation at 3.3 V, and features 5.0 V-tolerant inputs - enabling use in mixed-voltage I²C, UART, and GPIO interfacing between microcontrollers and peripherals.

For engineers reviewing the SN74LV1T125DCKR datasheet, SN74LV1T125DCKR pinout, SN74LV1T125DCKR application, or SN74LV1T125DCKR equivalent, key selection criteria include its single-channel 3-state buffer topology, SC70-5 package footprint, guaranteed VIH/VIL thresholds across VCC = 1.8–5.0 V, and verified down/up translation capability without external biasing.

Technical Context

The SN74LV1T125DCKR implements an LVxT-family enhanced-input architecture with reduced VIH/VIL thresholds to enable reliable up-translation (e.g., 1.8 V → 3.3 V at 3.3 V VCC) and 5 V-tolerant inputs for down-translation (e.g., 5.0 V → 3.3 V at 3.3 V VCC). Its output voltage is strictly referenced to VCC, ensuring compatibility with downstream 1.8 V, 2.5 V, 3.3 V, or 5 V 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 maintains stable switching performance up to 50 MHz at 3.3 V with 15 pF load - validated across –40°C to +125°C.

Key Specifications

Pinout & Package

SN74LV1T125DCKR is housed in a 5-pin SC70 (DCK) package measuring 2.00 mm × 2.10 mm (body: 2.00 mm × 1.25 mm), optimized for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV1T34DCKR and TXS0102DCUR, SN74LV1T125DCKR uniquely combines 3-state control, wide VCC scalability (1.8–5.5 V), and guaranteed 50 MHz performance - making it the preferred choice for programmable, multi-domain GPIO expansion where direction and timing are explicitly managed by the host.

Availability

SN74LV1T125DCKR is available at Aetrix Electronics and suitable for industrial sensor interfaces, wearable device GPIO expansion, automotive body control modules, and server management controller interfaces requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74LV1T125DCKR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic technologies.

SN74LV1T125DCKR belongs to TI's LVxT family of single-gate logic devices engineered specifically for voltage-level translation in space- and power-constrained systems - targeting portable, industrial, telecom, and automotive applications demanding minimal footprint and wide supply flexibility.

FAQ

What is the maximum operating frequency of SN74LV1T125DCKR at 1.8 V VCC?

The SN74LV1T125DCKR supports DC to 15 MHz operation at 1.8 V VCC with 15 pF load, as specified in the Switching Characteristics table. Propagation delay ranges from 10.5 ns (typ) to 14.0 ns (max), and tPZH/tPZL enable times are 9.0–13.0 ns (typ/max). This makes SN74LV1T125DCKR suitable for low-speed control signals like reset, interrupt, or enable lines in battery-powered devices.

Can SN74LV1T125DCKR translate 5 V inputs to 1.8 V outputs?

Yes - SN74LV1T125DCKR supports down-translation from 5.0 V inputs to 1.8 V outputs when powered at VCC = 1.8 V. Its 5 V-tolerant inputs allow direct connection to 5 V sources, and the output will swing between 0 V and ~1.8 V. VIH(min) is 0.95 V and VIL(max) is 0.57 V at 1.8 V VCC, ensuring robust recognition of 5 V logic levels. This behavior is confirmed in the datasheet's "Down Translation Combinations" section.

Is SN74LV1T125DCKR pin-compatible with other LV1T-series devices in SC70-5 package?

Yes - SN74LV1T125DCKR shares identical SC70-5 (DCK) pinout and footprint with SN74LV1T00DCKR, SN74LV1T04DCKR, SN74LV1T34DCKR, and other LV1T-series variants. Pin 1 is OE (for SN74LV1T125DCKR), but function varies per part (e.g., Pin 1 = A for inverters); thus, electrical compatibility requires verifying logic function and pin assignment - mechanical drop-in replacement is possible only within same functional type.

Does SN74LV1T125DCKR require external pull-up resistors on its inputs or outputs?

No - SN74LV1T125DCKR has internally optimized input thresholds and does not require external pull-ups for basic operation. However, unused inputs must be terminated to VCC or GND to prevent floating states and oscillation; TI recommends 10 kΩ resistors if dynamic driving is intermittent. Outputs do not require pull-ups due to active CMOS push-pull structure - they drive both HIGH and LOW actively.

What is the thermal resistance (RθJA) of SN74LV1T125DCKR in its SC70 package?

The junction-to-ambient thermal resistance RθJA for SN74LV1T125DCKR in the SC70 (DCK) package is 289.2 °C/W, as specified in Section 6.4 of the datasheet. This value assumes standard JEDEC test board conditions (2-layer board, 1 in² copper). For thermally demanding applications, designers should verify junction temperature using actual power dissipation (ICC × VCC + switching losses) and ambient conditions to ensure TJ remains below 150°C.