Texas Instruments 74AVC4T774QWBQBRQ1

Overview

74AVC4T774QWBQBRQ1 from Texas Instruments is an automotive-grade 4-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.08V–3.6V domains (e.g., 1.8V ↔ 3.3V), with independent per-channel direction control (DIR1–DIR4), 3-state outputs, and I_off partial-power-down support. It operates from –40°C to +125°C and delivers up to 500Mbps data rate in automotive telematics and cluster systems.

For engineers reviewing the 74AVC4T774QWBQBRQ1 datasheet, 74AVC4T774QWBQBRQ1 pinout, 74AVC4T774QWBQBRQ1 application, or 74AVC4T774QWBQBRQ1 equivalent, key selection criteria include per-bit DIR control, VCCA/VCCB rail independence, 4.6V I/O tolerance, AEC-Q100 qualification, and WQFN-16 (BQB) package compatibility with high-density PCB layouts.

Technical Context

The 74AVC4T774QWBQBRQ1 implements a fully configurable dual-rail architecture where A-port I/Os and all control inputs (DIR1–DIR4, OE) are referenced to VCCA (1.08V–3.6V), while B-port I/Os track VCCB (1.08V–3.6V). Each of the four channels operates independently under its own DIR signal, enabling asymmetric bidirectional data flow without shared direction bus constraints.

Its I_off circuitry actively disables outputs when either VCCA or VCCB is at GND, preventing backflow current during partial power-down. The VCC isolation feature forces both ports into high-impedance state if either supply rail collapses-critical for fault-tolerant automotive domain partitioning.

Key Specifications

Pinout & Package

74AVC4T774QWBQBRQ1 is packaged in a 3.5mm × 2.5mm WQFN-16 (BQB) with exposed thermal pad. The package supports automated optical inspection (AOI) and offers superior thermal performance (R_θJA = 79.9°C/W) versus TSSOP alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC4T245QWBQBRQ1 and TXS4T245QPWRQ1, the 74AVC4T774QWBQBRQ1 uniquely delivers per-channel DIR control, 500Mbps capability, and tighter propagation delay-making it the only option for mixed-direction, high-speed automotive domain bridging.

Availability

74AVC4T774QWBQBRQ1 is available at Aetrix Electronics and suitable for telematics control units, digital instrument clusters, and automotive head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AVC4T774QWBQBRQ1 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 experience delivering AEC-Q100-qualified components for safety-critical vehicle systems.

The 74AVC4T774QWBQBRQ1 belongs to TI's AVC family of advanced voltage-translating transceivers, designed specifically for flexible, high-reliability inter-domain communication in next-generation automotive electronics.

FAQ

What is the maximum supported data rate for 74AVC4T774QWBQBRQ1 in automotive applications?

The 74AVC4T774QWBQBRQ1 supports up to 500Mbps data rate when translating between 1.08V–3.6V domains (e.g., 1.8V ↔ 3.3V), verified across the full –40°C to +125°C operating range per AEC-Q100 test conditions. This performance enables use in high-speed SPI, UART, and GPIO expansion links within automotive ECUs without timing degradation.

How does the I_off feature protect circuits during partial power-down in 74AVC4T774QWBQBRQ1?

The I_off circuitry in 74AVC4T774QWBQBRQ1 disables output drivers when either VCCA or VCCB is at 0V, preventing damaging backflow current from an active rail into a powered-down domain. This behavior is explicitly characterized in the datasheet (I_off ≤ ±5 µA over temperature) and is critical for modular power gating in automotive gateways and domain controllers.

Can 74AVC4T774QWBQBRQ1 translate between 1.2V and 3.3V logic levels bidirectionally?

Yes-74AVC4T774QWBQBRQ1 is explicitly designed for universal bidirectional translation between any combination of 1.08V–3.6V supplies, including 1.2V ↔ 3.3V. Its dual-rail architecture ensures A-port I/Os track VCCA and B-port I/Os track VCCB, with full 4.6V tolerance on all pins to handle overshoot and noise margins safely.

What is the purpose of the exposed thermal pad on the 74AVC4T774QWBQBRQ1 WQFN package?

The exposed thermal pad on the 74AVC4T774QWBQBRQ1 (BQB package) must be connected to a secondary GND plane or left electrically open per TI layout guidelines. When soldered to GND, it reduces junction-to-board thermal resistance to 49.0°C/W, improving thermal performance in thermally constrained automotive modules such as head units and ADAS processors.

How does the VCC isolation feature function in 74AVC4T774QWBQBRQ1 during power sequencing?

The VCC isolation feature in 74AVC4T774QWBQBRQ1 forces both A and B ports into high-impedance state whenever either VCCA or VCCB is at GND. This prevents unintended signal coupling or latch-up during asymmetric power-up/down sequences-ensuring safe domain isolation in automotive systems with staggered rail activation.