Texas Instruments CAXC4T245QRSVRQ1

Overview

CAXC4T245QRSVRQ1 from Texas Instruments is an AEC-Q100 qualified 4-bit dual-supply bus transceiver enabling bidirectional voltage translation between 0.65V and 3.6V rails, with independent A- and B-port power supplies (VCCA/VCCB), tri-state outputs, and automotive-grade thermal operation from –40°C to +125°C. It supports up to 380 Mbps data transfer in 1.8V-to-3.3V translation and features VCC isolation and Ioff partial-power-down for robust system-level power sequencing in ADAS and infotainment domains.

For engineers reviewing the CAXC4T245QRSVRQ1 datasheet, CAXC4T245QRSVRQ1 pinout, CAXC4T245QRSVRQ1 application, or CAXC4T245QRSVRQ1 equivalent, key selection criteria include dual-rail configurability, glitch-free supply sequencing, high-speed timing performance across voltage combinations, and wettable flank QFN package compatibility with automated optical inspection (AOI) in automotive PCB assembly.

Technical Context

The CAXC4T245QRSVRQ1 implements a fully configurable dual-rail architecture where each port (A/B) tracks its own supply (VCCA/VCCB), enabling asynchronous level-shifting without direction dependency on supply order. Control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced solely to VCCA, simplifying control logic design in mixed-voltage systems.

VCC isolation disables all I/Os when either VCCA or VCCB falls below 100 mV, preventing back-drive during brown-out conditions. The device supports simultaneous up/down translation via separate direction-control pins per transceiver pair, and its Ioff circuitry limits leakage to ±4 µA at 125°C when powered down-critical for battery-sensitive EV BMS and telematics modules.

Key Specifications

Pinout & Package

Package: RSV (16-pin UQFN, 2.6 mm × 1.8 mm, wettable flank). Compact footprint and side-wettable leads support AOI-compatible reflow and high-reliability solder joint inspection required for automotive production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LXC4T245PWR and TXS0104EPWR, the CAXC4T245QRSVRQ1 uniquely delivers AEC-Q100 qualification, VCC isolation, 125°C Ioff guarantee, and 380 Mbps capability - making it the sole option for automotive applications demanding simultaneous voltage translation, fault containment, and high-speed deterministic timing.

Availability

CAXC4T245QRSVRQ1 is available at Aetrix Electronics and suitable for infotainment head units, ADAS fusion ECUs, and EV battery management systems requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing through TI-authorized channels.

Supply support for CAXC4T245QRSVRQ1 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 electronics, with decades of experience delivering AEC-Q100-qualified components for safety-critical vehicle systems.

The SN74AXC4T245-Q1 product line targets automotive domain controllers requiring robust, low-voltage-capable voltage translation between heterogeneous SoCs, sensors, and peripherals - designed specifically for ADAS, electrification, and digital cockpit architectures.

FAQ

What is the minimum operating voltage for CAXC4T245QRSVRQ1 on VCCA and VCCB rails?

The CAXC4T245QRSVRQ1 supports a minimum supply voltage of 0.65V on both VCCA and VCCB rails, enabling direct interface with sub-1V logic families such as LPDDR5 I/O and advanced ultra-low-power microcontrollers. This specification is validated across the full –40°C to +125°C automotive temperature range and is explicitly defined in Section 5.3 (Recommended Operating Conditions) of the official TI datasheet SCES905F.

Does CAXC4T245QRSVRQ1 support bidirectional data flow on the same transceiver pair?

No - the CAXC4T245QRSVRQ1 does not support simultaneous bidirectional flow on a single A/B pin pair. Each transceiver (e.g., 1A1 ↔ 1B1) operates unidirectionally per cycle, with direction determined by the corresponding DIR input (1DIR or 2DIR). However, independent control of 1DIR and 2DIR allows one pair to transmit A→B while the other transmits B→A concurrently - a key capability confirmed in the Functional Description (Section 3) and Device Functional Modes (Section 7.4) of the CAXC4T245QRSVRQ1 datasheet.

How does the VCC isolation feature behave when VCCA = 0V and VCCB = 3.3V?

When either VCCA or VCCB drops below 100 mV - including VCCA = 0V with VCCB = 3.3V - the CAXC4T245QRSVRQ1 automatically places all A-port and B-port I/Os into high-impedance state, regardless of DIR/OE logic levels. This behavior is guaranteed by the internal VCC isolation circuitry and is documented in Section 3 (Description) and Section 7.3 (Feature Description) of the TI datasheet SCES905F, ensuring bus safety during asymmetric power loss scenarios common in automotive electrical systems.

Is CAXC4T245QRSVRQ1 pin-compatible with SN74AXC4T245QPWRQ1?

No - CAXC4T245QRSVRQ1 (RSV package, 2.6 mm × 1.8 mm) is not pin-compatible with SN74AXC4T245QPWRQ1 (PW package, TSSOP-16, 5 mm × 6.4 mm). While both share identical logic functionality and pin functions, their physical layouts differ significantly: RSV uses a 3×3 array with center thermal pad, whereas PW uses a standard 16-pin rectangular outline. Package dimensions, land patterns, and solder paste stencil requirements are mutually incompatible, as detailed in Section 11 (Mechanical, Packaging, and Orderable Information) of the datasheet.

What is the maximum guaranteed data rate for CAXC4T245QRSVRQ1 at 125°C?

The CAXC4T245QRSVRQ1 guarantees up to 380 Mbps operation specifically for 1.8V-to-3.3V translation at 25°C ambient, but maximum speed degrades with temperature. At TA = 125°C, the worst-case propagation delay (tpd) is 15 ns (A→B, VCCA=1.8V, VCCB=3.3V, Section 5.11), implying a practical maximum data rate of ~66 Mbps for reliable setup/hold margin. This derating is inherent to silicon performance at temperature extremes and is reflected in all switching characteristics tables across Sections 5.6–5.13 of the official datasheet.