Texas Instruments TCAN4550RGYTQ1

Overview

TCAN4550RGYTQ1 from Texas Instruments is an automotive-grade System Basis Chip integrating a CAN FD controller, CAN FD transceiver, and SPI interface in a single VQFN-20 package. It supports up to 8 Mbps CAN FD data rates, ISO 11898-1:2015 and Bosch M_CAN v3.2.1.1 protocols, and provides 5 V LDO output (70 mA) for external circuitry - deployed in body electronics, infotainment, and industrial transport ECUs.

For engineers reviewing the TCAN4550RGYTQ1 datasheet, TCAN4550RGYTQ1 pinout, TCAN4550RGYTQ1 application, or TCAN4550RGYTQ1 equivalent, key selection considerations include AEC-Q100 Grade 1 qualification (–40°C to 125°C), ±58 V bus fault protection, 3.3–5 V logic compatibility, failsafe/sleep/standby operating modes, and integrated wake-up via WAKE pin or CAN bus pattern detection.

Technical Context

The TCAN4550RGYTQ1 implements a dual-function architecture: its M_CAN-compatible controller handles protocol framing, filtering, and message buffering via SPI, while its physical-layer transceiver delivers differential TX/RX with ±58 V fault tolerance and programmable slew rate control. The device uses internal dominant timeout and time-out watchdog to prevent bus lockup.

It operates across three power states - normal (full functionality), standby (low-power bus monitoring), and sleep (ultra-low current <42 µA) - with seamless transitions triggered by SPI commands or hardware events (LWU/WUP). The integrated 5 V LDO supplies both internal transceiver circuitry and external peripherals, eliminating need for discrete regulators.

Key Specifications

Pinout & Package

VQFN-20 package (4.5 mm × 3.5 mm, 0.5 mm pitch) with exposed thermal pad soldered to PCB ground for thermal management and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CAN FD SBC applications.

Compared with TCAN4550RGYTQ1, TCAN4551RGYTQ1 offers identical core functionality with minor GPIO configuration differences, while TJA1145ATK/0Z trades higher CAN FD speed and integrated LDO for broader ecosystem support and lower unit cost in volume production - making TCAN4550RGYTQ1 optimal for new designs prioritizing performance, integration, and thermal efficiency.

Availability

TCAN4550RGYTQ1 is available at Aetrix Electronics and suitable for body electronics, infotainment systems, and industrial transport applications requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for TCAN4550RGYTQ1 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 in high-reliability automotive electronics design and manufacturing.

The TCAN4550RGYTQ1 belongs to TI's automotive CAN FD System Basis Chip product line, engineered to consolidate controller, transceiver, power, and wake functionality into a single package for next-generation E/E architectures requiring high-speed, low-power, and functional safety-compliant CAN interfaces.

FAQ

What is the maximum CAN FD data rate supported by the TCAN4550RGYTQ1?

The TCAN4550RGYTQ1 supports CAN FD data rates up to 8 Mbps, compliant with ISO 11898-1:2015 and Bosch M_CAN Revision 3.2.1.1. This enables high-throughput communication for firmware updates, sensor fusion, and ADAS data exchange. The TCAN4550RGYTQ1 achieves this using optimized transceiver slew rate control and low-jitter internal clocking derived from its 20/40 MHz crystal interface.

Does the TCAN4550RGYTQ1 require an external crystal oscillator?

The TCAN4550RGYTQ1 supports both crystal-based and single-ended clock input configurations. Pins OSC1 and OSC2 accept a 20 MHz or 40 MHz crystal (with specified ESR ≤60 Ω), or OSC1 can be driven by an external clock source while OSC2 is grounded. The TCAN4550RGYTQ1 uses this clock for precise CAN bit timing and internal SPI synchronization - no external oscillator IC is required.

How does the TCAN4550RGYTQ1 handle power loss on VSUP?

When VSUP drops below UVLO thresholds (rising: 5.2–5.7 V; falling: 4.5–5.0 V), the TCAN4550RGYTQ1 enters protected mode and disables outputs. During complete power loss, CANH/CANL and all logic pins become high-impedance to avoid loading the live CAN bus. The TCAN4550RGYTQ1 resumes operation only after VSUP stabilizes above threshold and internal POR completes - ensuring glitch-free restart.

Can the TCAN4550RGYTQ1 operate with a 3.3 V microcontroller?

Yes, the TCAN4550RGYTQ1 supports 3.3 V I/O logic through its VIO pin (3.135–5.25 V range). All SPI signals (SCLK, SDI, SDO, nCS), GPIOs, and interrupt outputs are level-shifted to match the host MCU's VIO supply. The TCAN4550RGYTQ1 maintains full functionality including 8 Mbps CAN FD and 5 V LDO output regardless of whether VIO is set to 3.3 V or 5 V.

What wake-up mechanisms does the TCAN4550RGYTQ1 support in sleep mode?

In sleep mode, the TCAN4550RGYTQ1 supports two independent wake sources: local wake via the nWKRQ pin (active-low, 5–42 V tolerant), and bus wake via ISO 11898-2:2016 Wake-Up Pattern (WUP) detection on the CAN bus. Both trigger automatic transition to standby mode within 200 µs, followed by VCCOUT ramp-up in 1.5 ms. The TCAN4550RGYTQ1 retains wake flag status until cleared by host SPI command.