Texas Instruments SN74LVT125QPWRQ1

Overview

SN74LVT125QPWRQ1 from Texas Instruments is an automotive-qualified 3.3-V ABT quadruple bus buffer with 3-state outputs, featuring four independent noninverting drivers, bus-hold inputs, and Ioff partial-power-down support. It operates from 2.7 V to 3.6 V VCC, accepts 5-V-tolerant inputs, and delivers 32 mA sink/source drive at 3.3 V - used in automotive infotainment data buses for level-shifting between 3.3-V logic and legacy 5-V subsystems.

For engineers reviewing the SN74LVT125QPWRQ1 datasheet, SN74LVT125QPWRQ1 pinout, SN74LVT125QPWRQ1 application, or SN74LVT125QPWRQ1 equivalent, this page provides verified functional specifications, TSSOP-14 package details, automotive-grade reliability context, bus-hold behavior implications, and validated alternative options for mixed-voltage bus interfacing.

Technical Context

This device implements four independent noninverting buffer channels, each controlled by a dedicated output-enable (OE) input that places the corresponding Y output into high-impedance when asserted high. Bus-hold circuitry actively maintains valid logic states on unused A inputs without external resistors.

Its Ioff specification enables safe operation during partial power-down, blocking reverse current flow when VCC = 0 V and inputs/outputs range from 0 V to 4.5 V. The design supports mixed-mode signaling: 5-V inputs are safely tolerated while operating from a 3.3-V supply, enabling interoperability between 3.3-V controllers and 5-V peripherals.

Key Specifications

Pinout & Package

TSSOP-14 package (PW), 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74LVT125QPWRQ1, SN74LVTH125QPWRQ1 trades 8 mA drive for lower ICC and tighter VIH, while SN74AVC16244DGGRQ1 offers scalability at the cost of complexity, missing bus-hold, and requiring additional layout area - making SN74LVT125QPWRQ1 optimal for compact, robust 4-channel automotive bus isolation.

Availability

SN74LVT125QPWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment backplanes, ADAS sensor aggregation nodes, and body control module gateways requiring stable component supply under AEC-Q100 Grade 1 conditions.

Supply support for SN74LVT125QPWRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The SN74LVT125QPWRQ1 belongs to TI's LVT (Low-Voltage BiCMOS Technology) logic family, engineered specifically for high-speed, mixed-voltage automotive data routing with robust ESD and power sequencing resilience.

FAQ

What is the maximum operating temperature range for the SN74LVT125QPWRQ1?

The SN74LVT125QPWRQ1 is qualified for automotive applications with an operating free-air temperature range of –40°C to +125°C, meeting AEC-Q100 Grade 1 requirements. This rating is confirmed in the Recommended Operating Conditions table and applies across the full VCC range (2.7 V to 3.6 V). Thermal derating is not required within this envelope, and θJA for the PW package is 113°C/W.

Does the SN74LVT125QPWRQ1 support 5-V input signals while powered from 3.3 V?

Yes, the SN74LVT125QPWRQ1 supports 5-V-tolerant inputs with VI up to 7 V, explicitly enabling mixed-mode operation. When VCC = 3.3 V, inputs can swing from –0.5 V to 5.5 V without damage or functional degradation. This capability is documented in both Absolute Maximum Ratings and Recommended Operating Conditions, and eliminates need for external level translators in 3.3-V/5-V interface designs.

How does bus-hold functionality work on the SN74LVT125QPWRQ1 inputs?

The SN74LVT125QPWRQ1 integrates active bus-hold circuitry on all A inputs, which detects and latches the last valid logic state (high or low) when the input is floating. It sources or sinks ±75 µA (typical) to maintain that state, preventing undefined logic levels. TI explicitly advises against using external pullup/pulldown resistors with this feature, as they may conflict with internal biasing and increase power consumption.

Can the SN74LVT125QPWRQ1 be used in partial-power-down configurations?

Yes, the SN74LVT125QPWRQ1 supports partial-power-down via its Ioff specification: when VCC = 0 V, the device blocks current flow from inputs or outputs (0 V to 4.5 V) with ±450 µA max leakage. This prevents backdrive into powered-down domains - a key requirement for automotive power architecture partitioning, such as isolating infotainment MCU cores while keeping display buffers active.

What is the recommended power-up sequence for the SN74LVT125QPWRQ1 to ensure high-impedance outputs?

To guarantee high-impedance outputs during power-up, TI recommends tying all OE inputs to VCC through a pullup resistor. The minimum resistance value depends on the current-sinking capability of the driving source; for standard CMOS drivers, 10 kΩ is commonly used. This ensures OE remains high until the controlling logic asserts it low, preventing bus contention during startup transients in automotive ECUs.