Texas Instruments SN74LV4T125QPWRQ1

Overview

SN74LV4T125QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quad buffer with 3-state outputs, enabling bidirectional voltage-level translation across 1.8 V to 5.5 V supply rails. It supports up-translation (e.g., 1.2 V → 1.8 V) and down-translation (e.g., 5.0 V → 3.3 V), delivers ≤10.5 ns propagation delay at 5-V VCC, and features 5.5-V tolerant inputs - used in automotive body control modules for interfacing mixed-voltage sensors and microcontrollers.

For engineers reviewing the SN74LV4T125QPWRQ1 datasheet, SN74LV4T125QPWRQ1 pinout, SN74LV4T125QPWRQ1 application, or SN74LV4T125QPWRQ1 equivalent, key selection criteria include its 125°C operating range, 3-state output timing behavior under varying VCC and load capacitance, input threshold compatibility with sub-1.8-V logic families, and TSSOP-14 package thermal resistance (RθJA = 151.0°C/W).

Technical Context

This device implements four independent positive-logic buffers (Y = A) with active-low 3-state enable (OE), where output voltage level is strictly referenced to VCC and input thresholds are optimized for LVxT translation. Its architecture supports simultaneous up- and down-translation without external components, validated across 1.8 V, 2.5 V, 3.3 V, and 5.0 V supply conditions.

Each channel operates with balanced CMOS drive strength (±25 mA at 3.3–5.0 V), latch-up immunity >250 mA (JESD17), and HBM/CDM ESD ratings of ±4 kV / ±2 kV. Input clamping diodes and 5.5-V tolerant pins allow safe interfacing with higher-voltage legacy buses while maintaining low ICC (≤20 µA) in static operation.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm body size), 14-pin thin shrink small outline package with exposed pad not present; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV4T125QPWRQ1, SN74LVC4T245PWR offers more channels but lacks automotive qualification and 5.5-V input tolerance, while TXS0104EPWR provides automatic direction control but cannot operate above 3.6 V or in automotive temperature ranges - making SN74LV4T125QPWRQ1 uniquely suited for unidirectional, high-reliability, mixed-voltage automotive signal routing.

Availability

SN74LV4T125QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control, ADAS sensor interfacing, electric power steering systems, and infotainment display control requiring stable component supply across extended temperature and long product lifecycles.

Supply support for SN74LV4T125QPWRQ1 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-grade logic solutions with over 50 years of automotive qualification experience.

The SN74LV4T125QPWRQ1 belongs to TI's LVxT family - engineered specifically for single-supply voltage translation in harsh automotive environments, targeting mixed-voltage signal routing between MCUs, sensors, and actuators.

FAQ

What is the maximum input voltage the SN74LV4T125QPWRQ1 can tolerate?

The SN74LV4T125QPWRQ1 features 5.5-V tolerant inputs, meaning it can safely accept input signals up to 5.5 V regardless of VCC level - enabling direct interface with 5-V peripherals while operating from 1.8-V or 2.5-V supplies. This specification is verified per Absolute Maximum Ratings and applies across the full –40°C to +125°C temperature range.

Does the SN74LV4T125QPWRQ1 support bidirectional level translation?

No, the SN74LV4T125QPWRQ1 is a unidirectional buffer (Y = A) with independent 3-state control per channel. It does not auto-sense direction or support true bidirectional data flow like the TXS0104E. For bidirectional translation, alternate devices such as SN74LVC4T245PWR must be considered - though they lack SN74LV4T125QPWRQ1's 5.5-V input tolerance and AEC-Q100 Grade 1 rating.

What is the recommended decoupling for the SN74LV4T125QPWRQ1?

A minimum 100-nF ceramic capacitor placed within 3 mm of the VCC pin and connected to the nearest GND pin is recommended for stable operation. For systems with high switching activity across multiple channels, adding a 1-µF bulk capacitor nearby improves transient response. Layout guidelines emphasize short, low-inductance paths to minimize ground bounce and ensure consistent 3-state timing.

Can unused inputs on the SN74LV4T125QPWRQ1 be left floating?

No - all unused inputs on the SN74LV4T125QPWRQ1 must be terminated to either VCC or GND to prevent undefined logic states, excessive ICC, or oscillation. TI explicitly recommends 10-kΩ pull-up or pull-down resistors for inputs that may transition between driven and undriven states. Floating inputs violate Recommended Operating Conditions and risk latch-up or increased EMI susceptibility.

How does the SN74LV4T125QPWRQ1 achieve up-translation from 1.2 V to 1.8 V?

The SN74LV4T125QPWRQ1 achieves 1.2-V-to-1.8-V up-translation using its LVxT-enhanced input structure, which lowers VIH(MIN) to 1.1 V when VCC = 1.8 V. This allows a 1.2-V logic HIGH (≥1.1 V) to be recognized correctly, while the output swings rail-to-rail between 0 V and 1.8 V - confirmed by Electrical Characteristics tables and Figure 8-2 in the official datasheet.