Texas Instruments SN74LV1T126QDCKRQ1

Overview

SN74LV1T126QDCKRQ1 from Texas Instruments is an automotive-grade single-buffer gate with 3-state output and integrated bidirectional voltage translation. It performs Y = A logic, supports 1.8 V to 5.5 V supply, enables up/down level shifting (e.g., 1.2 V → 1.8 V or 5.0 V → 3.3 V), and operates from –40°C to +125°C. It is used in automotive body control modules for isolating CAN/LIN interface signals during sleep mode.

For engineers reviewing the SN74LV1T126QDCKRQ1 datasheet, SN74LV1T126QDCKRQ1 pinout, SN74LV1T126QDCKRQ1 application, or SN74LV1T126QDCKRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, 5.5-V tolerant inputs, 150 Mbps switching at 5 V, 3-state enable timing (TEN/TDIS < 14 ns), and SC70-5 package compatibility with space-constrained automotive PCB layouts.

Technical Context

This device implements a positive-logic buffer (Y = A) with active-high 3-state control via OE. Its LVxT input architecture features reduced VIH/VIL thresholds for reliable up-translation and 5.5-V tolerant pins enabling down-translation without external components.

Output voltage levels are referenced strictly to VCC (1.8 V/2.5 V/3.3 V/5.0 V), and propagation delay scales inversely with supply voltage - 4.1 ns typical at 5.0 V, 12.7 ns at 1.8 V (CL = 15 pF). Thermal resistance is 293.4°C/W (Junction-to-Ambient, DCK package).

Key Specifications

Pinout & Package

SN74LV1T126QDCKRQ1 is packaged in a 5-pin SC70 (DCK) case measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for high-density automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV1T126QDCKRQ1, SN74LVC1G125QDCKRQ1 lacks translation capability and 5.5-V tolerance, limiting its use to single-rail systems, while NLSV1T244MUTAG omits down-translation support - making SN74LV1T126QDCKRQ1 the only option for bidirectional mixed-voltage isolation in AEC-Q100-compliant designs.

Availability

SN74LV1T126QDCKRQ1 is available at Aetrix Electronics and suitable for automotive body control, instrument cluster, ADAS sensor interface, and infotainment subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LV1T126QDCKRQ1 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 automotive ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

SN74LV1T126QDCKRQ1 belongs to TI's LVxT logic family, engineered specifically for automotive voltage translation challenges - enabling seamless interoperability between legacy 5-V, modern 3.3-V/1.8-V, and ultra-low-voltage 1.2-V subsystems without external components.

FAQ

What is the maximum data rate supported by SN74LV1T126QDCKRQ1?

SN74LV1T126QDCKRQ1 supports up to 150 Mbps at 5.0 V VCC with 15 pF load, verified by TI's switching characteristics tables (TPD = 4.1 ns typical). At 3.3 V, it achieves 100+ Mbps (TPD = 6.0 ns typical), making it suitable for high-speed automotive serial links like LIN header timing and sensor clock distribution.

Does SN74LV1T126QDCKRQ1 require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs on SN74LV1T126QDCKRQ1 must be terminated to VCC or GND to prevent floating states that cause excessive current draw and oscillation. TI recommends a 10-kΩ resistor for default HIGH or LOW biasing, as specified in Section 7.3.3 of the datasheet.

Can SN74LV1T126QDCKRQ1 translate 5.0 V signals down to 1.8 V logic levels?

Yes - SN74LV1T126QDCKRQ1 supports down-translation from 5.0 V to 1.8 V when operated with 1.8 V VCC. Its 5.5-V tolerant inputs accept 5.0 V signals directly, and output levels conform to 1.8 V CMOS thresholds (VOH ≥ 1.62 V, VOL ≤ 0.2 V at IO = ±3 mA).

Is SN74LV1T126QDCKRQ1 pin-compatible with other SC70-5 logic buffers?

SN74LV1T126QDCKRQ1 uses the standard SC70-5 pinout (OE-A-GND-Y-VCC), matching TI's SN74LVC1G125QDCKRQ1 and SN74AUP1G125DCKR. However, functional differences (e.g., translation capability, input thresholds) mean electrical compatibility requires verification per application.

What thermal derating applies to SN74LV1T126QDCKRQ1 in sealed automotive enclosures?

With RθJA = 293.4°C/W (DCK package), SN74LV1T126QDCKRQ1's junction temperature rise is ~29°C per 100 mW dissipation at ambient. In sealed enclosures above 85°C ambient, power must be limited to maintain TJ ≤ 150°C - e.g., max 220 mW at 85°C ambient per absolute maximum ratings.