Texas Instruments SN74LV1T34DCKR

Overview

SN74LV1T34DCKR from Texas Instruments is a single-channel CMOS logic-level translator buffer with 5-pin SC70 packaging, supporting bidirectional voltage translation across 1.65 V to 5.5 V supply range, 5 V-tolerant inputs, and output drive up to 8 mA at 5 V - deployed in mixed-voltage I/O interfacing between 1.2 V/1.8 V microcontrollers and 3.3 V/5 V peripherals.

For engineers reviewing the SN74LV1T34DCKR datasheet, SN74LV1T34DCKR pinout, SN74LV1T34DCKR application, or SN74LV1T34DCKR equivalent, key selection considerations include verified up/down translation capability (e.g., 1.2 V → 1.8 V at 1.8 V VCC), latch-up immunity (>250 mA), –40°C to 125°C operation, and compatibility with AUP1G/LVC1G logic families.

Technical Context

The SN74LV1T34DCKR implements a non-inverting buffer topology with LVxT-enhanced input thresholds enabling reliable level-shifting without external biasing. Its input stage supports 5 V tolerance independent of VCC, while output voltage levels are strictly referenced to VCC - ensuring precise CMOS-compatible VOH/VOL across all supported supply voltages (1.65–5.5 V).

It operates as a unidirectional translator with fixed input-to-output signal flow (A → Y), no enable control, and balanced push-pull CMOS outputs capable of 7 mA at 3.3 V and 3 mA at 1.8 V. Switching performance is characterized up to 50 MHz at 3.3 V VCC with 15 pF load, and propagation delay remains stable across –40°C to 125°C.

Key Specifications

Pinout & Package

SN74LV1T34DCKR uses the SC70-5 (DCK) package: 2.00 mm × 1.25 mm body size, 2.00 mm × 2.10 mm overall footprint, 0.65 mm pitch, and surface-mount construction optimized for space-constrained portable and embedded designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar logic-level translation applications.

Compared with SN74LVC1T34DCKR and TXB0101DCKR, the SN74LV1T34DCKR delivers superior low-voltage up-translation capability and zero-direction-control overhead, making it the preferred choice for fixed-path, high-reliability level-shifting in industrial and automotive control systems.

Availability

SN74LV1T34DCKR is available at Aetrix Electronics and suitable for industrial sensor interface, portable device power management, server baseboard management, and automotive infotainment I/O expansion requiring stable component supply across extended temperature ranges.

Supply support for SN74LV1T34DCKR 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 industrial and automotive-grade components.

The SN74LV1T34DCKR belongs to TI's LVxT family of single-gate logic translators, designed specifically for space-constrained, mixed-voltage system interfacing where minimal footprint, wide VCC range, and guaranteed level-shifting performance are critical.

FAQ

What is the maximum operating frequency of the SN74LV1T34DCKR?

The SN74LV1T34DCKR is characterized up to 50 MHz at 3.3 V VCC with a 15 pF load, delivering typical propagation delay of 4 ns. At 5 V VCC, it achieves 2.7 ns (typ) delay under same conditions. Performance degrades gradually below 1.8 V VCC, with 10.5 ns (typ) at 1.8 V/15 pF - making it suitable for DC to 25 MHz applications in ultra-low-voltage systems. The SN74LV1T34DCKR does not specify minimum pulse width or maximum toggle rate beyond these switching characteristics.

Can the SN74LV1T34DCKR translate 5 V signals down to 1.8 V logic levels?

Yes, the SN74LV1T34DCKR supports down-translation from 5 V inputs to 1.8 V outputs when operated at 1.8 V VCC. Its 5 V-tolerant input pins accept 5 V signals safely, and its output swings rail-to-rail relative to VCC - producing ~0 V (LOW) and ~1.8 V (HIGH). This configuration is explicitly validated in TI's datasheet for 5.0 V → 1.8 V translation, with VIH(min) = 0.99 V and VIL(max) = 0.55 V at 1.8 V VCC ensuring noise margin compliance. The SN74LV1T34DCKR requires no external components to achieve this function.

Is the SN74LV1T34DCKR pin-compatible with other SC70-5 logic gates?

Yes, the SN74LV1T34DCKR shares identical SC70-5 (DCK) mechanical footprint and pinout (NC/A/GND/Y/VCC) with TI's SN74LV1Txx family including SN74LV1T00, SN74LV1T04, and SN74LV1T17. This enables drop-in replacement across buffer, inverter, NAND, NOR, and Schmitt-trigger variants without PCB layout changes - provided functional equivalence (e.g., non-inverting buffer behavior) is maintained in the target application. The SN74LV1T34DCKR's pin 1 (NC) is consistent across all DCK-packaged LV1T devices.

Does the SN74LV1T34DCKR require external pull-up or pull-down resistors on unused pins?

No external resistors are needed on pin 1 (NC), which is not internally connected. However, all unused *inputs* must be terminated - but the SN74LV1T34DCKR has only one input (pin 2, A), so no unused inputs exist in standard operation. If multiple SN74LV1T34DCKR devices are used and some inputs remain unconnected, they must be tied to VCC or GND per TI's recommendation to prevent floating states and excessive ICC. The SN74LV1T34DCKR itself contains no internal termination; external biasing is required only for truly unused inputs, not NC pins.

What thermal performance can be expected from the SN74LV1T34DCKR in continuous operation?

The SN74LV1T34DCKR has a junction-to-ambient thermal resistance (RθJA) of 289.2°C/W in the SC70-5 (DCK) package. Under worst-case conditions (5.5 V VCC, 8 mA output drive, 125°C ambient), power dissipation remains below 10 mW - resulting in negligible junction temperature rise (<3°C above ambient). This confirms suitability for thermally constrained spaces like handheld devices and sealed industrial enclosures without heatsinking. The SN74LV1T34DCKR's low ICC (≤10 µA static) further minimizes self-heating across its full operating range.