TJA1049T - 3V to 5V High-Speed CAN Transceiver | NXP
Артикул: TJA1049T ✓ АктивенTJA1049T Обзор
A CAN transceiver is an interface IC within the broader CAN controller, CAN physical layer, network interface, and semiconductor hierarchy. It converts logic-level TXD and RXD signals into the dominant and recessive states carried by CANH and CANL. Conversely, it converts bus activity back into a logic-level receive signal, allowing a microcontroller or dedicated CAN controller to exchange protocol data with other nodes.
Key verified features include direct interfacing with microcontrollers operating from 3 V to 5 V, support for the ISO 11898-2:2003 and ISO 11898-5:2007 standards, and compatibility with existing TJA1040, PCA82C250, and PCA82C251 applications when operated with a 5 V microcontroller. The NXP TJA1049T/3 and TJA1049TK/3 variants also support low-voltage microcontroller interfaces.
The TJA1049 uses a physical-layer architecture designed for high-speed Controller Area Network communication. Its eight-pin SOIC arrangement provides separate transmit, receive, standby-control, supply, and bus connections, allowing a straightforward interface to a CAN controller. Because the supplied evidence does not include complete timing, current, loop-delay, or temperature limits, those values remain unspecified rather than being inferred.
Typical uses include in-vehicle Controller Area Network nodes, industrial automation equipment, robotics controllers, building-automation gateways, and embedded industrial communication modules. The 3 V interface capability is especially useful when the associated microcontroller operates below the traditional 5 V CAN-transceiver supply level. The standby function supports systems where local bus participation must be disabled to reduce activity or control system state.
Designers should use the exact datasheet pin configuration and verify the MCU, transceiver, bus, termination, and decoupling connections before layout release. The CAN bus requires suitable 120-ohm termination only where dictated by the network topology, while common-mode and ESD protection requirements depend on the vehicle or industrial environment. Wake-up behavior must also be checked when the original design depends on a particular dominant-to-recessive bus sequence.
This page combines the verified manufacturer statements, distributor availability information, pricing evidence, packaging details, and the identified TI cross-reference discussion. It explicitly separates documented facts from unavailable parameters and provides an engineering-focused selection guide for designers evaluating the TJA1049T and its verified drop-in alternative.
Аналоги без доработки для TJA1049T — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с TJA1049T (тот же форм-фактор и посадочное место) — отличается по Package.
TCAN1044A-Q1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TJA1049T Характеристики
| Product Type | High-speed CAN transceiver |
| CAN Protocol Support | ISO 11898 |
| MCU Interface Supply Voltage | 3 V to 5 V |
| Bus Interface | 2-wire CAN bus |
| Количество выводов | 8 pins |
| Корпус | 8-pin SOIC |
| Тип монтажа | Surface mount |
| Lead Form | Gull wing |
| Package Shape | Rectangular |
| Temperature Grade | Automotive |
| ISO 11898-2 Edition | 2003 |
| ISO 11898-5 Edition | 2007 |
| Standby Mode | Yes |
| Wake-Up Support | Yes |
| Статус RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Status | unknown |
Конфигурация выводов TJA1049T
| Контакт 1 | TXD — Transmit data input |
| Контакт 2 | GND — Ground |
| Контакт 3 | VCC — Transceiver supply voltage |
| Контакт 4 | RXD — Receive data output |
| Контакт 5 | STB — Standby control input |
| Контакт 6 | CANH — CAN high bus line |
| Контакт 7 | CANL — CAN low bus line |
| Контакт 8 | VIO — Logic-side supply voltage for the controller interface |
Типичное применение
TJA1049T подходит для 6 применениеs: Automotive CAN Network Node, Industrial Automation Controller, Robotics Communication Module, Building Automation Gateway, EV Charging System Interface, Embedded CAN Communication Module.
Automotive CAN Network Node
The TJA1049T fits an automotive CAN node because it provides the physical-layer interface between a CAN controller and the two-wire CANH/CANL bus while allowing direct connection to 3 V to 5 V microcontrollers. The manufacturer identifies the family as automotive temperature grade and documents support for ISO 11898 physical-layer standards. In an electronic control unit, the controller produces TXD, the transceiver drives the bus, and RXD reports received bus state. Standby and wake-up functions help manage low-power operating states. Before schematic approval, verify the exact ordering variant, full temperature limits, bus fault behavior, and AEC-Q100 evidence from NXP.
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Industrial Automation Controller
The TJA1049T is appropriate for industrial automation equipment that connects a controller to a Controller Area Network bus. Its verified 3 V to 5 V microcontroller interface allows the transceiver to operate alongside modern embedded processors, while the CAN physical layer provides a standardized path for distributed commands and status data. Use TXD and RXD to connect the CAN controller and place the transceiver close to the bus connector to reduce exposed high-frequency traces. The network still requires appropriate termination, surge protection, and common-mode considerations. Because the supplied evidence does not specify the complete industrial temperature range or certification status, engineers should verify those documents before using the part in safety-related equipment.
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Robotics Communication Module
The TJA1049T can form the CAN physical layer in a robot controller, actuator hub, or mobile-platform communication module. Its 3 V interface capability supports a direct connection to low-voltage microcontrollers, while standby mode allows a module to reduce bus activity when it is not participating in communication. CANH and CANL connect to the protected bus network, and RXD returns bus state to the controller for protocol handling. In a robot, robust physical-layer behavior helps nodes exchange commands over a shared bus without introducing a separate UART physical layer. Layout and protection should be tailored to motor noise and cable transients, and the system designer must confirm wake-up behavior because the verified TI comparison identifies a difference from TCAN1044A-Q1.
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Building Automation Gateway
The TJA1049T can provide the CAN interface in a building-automation gateway that links sensors, actuators, HVAC controllers, or access equipment to a supervisory controller. The 3 V to 5 V logic-side compatibility supports embedded gateways built around low-power microcontrollers, and standby mode permits a controlled inactive state. Because CAN supports multiple nodes over a two-wire bus, the gateway can exchange compact command and diagnostic frames without a point-to-point serial link. The designer should coordinate bus termination, common-mode range, isolation, and surge protection with the building wiring environment. Verify the transceiver's operating limits and automotive-grade classification against the installation requirements; automotive temperature grade alone does not establish that every building-automation safety rule is satisfied.
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EV Charging System Interface
The TJA1049T is applicable to CAN communication links within electric-vehicle charging equipment, battery-management systems, or vehicle-to-grid interface modules. Its direct 3 V to 5 V microcontroller connection supports low-voltage automotive-domain controllers, while ISO 11898 physical-layer operation provides compatibility with established CAN networks. In a charger controller, the CAN transceiver translates the protocol controller's TXD and RXD signals into the differential bus state. The design must add protection appropriate for outdoor cables and high-energy automotive environments, including surge, ESD, and common-mode considerations. The verified sources identify the device family as automotive temperature grade, but engineers must independently verify the exact part's limits, qualification status, and automotive suitability documentation before production use.
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Embedded CAN Communication Module
The TJA1049T suits a compact embedded CAN communication module where a low-voltage MCU must connect to an external two-wire bus. The manufacturer's verified statement that TJA1049T/3 and TJA1049TK/3 support 3 V to 5 V controllers simplifies interface selection for compact control boards. TXD accepts the controller's transmit command, RXD reports bus state, and STB supports operating-state management. The same 8-pin SOIC package helps create a compact layout, although the exposed board area is still governed by trace spacing and bus protection components. Firmware should implement bus-off recovery, wake-up timing, and fault counters in the CAN controller. Do not assume that a physically pin-compatible substitute preserves the TJA1049's verified recessive-to-dominant wake-up behavior.
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Сводка рекомендуемых товаров
Справочные инженерные данные для TJA1049T — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | TCAN1044A-Q1 |
|---|---|---|
| Package | SOIC-8 | SOIC-8 |
| Brand | NXP Semiconductors | Texas Instruments |
| Product Type | High-speed CAN transceiver | High-speed CAN transceiver |
| Wake-Up Response | Responds after a recessive-to-dominant pulse | Responds to a dominant-to-recessive-to-dominant pulse sequence |
Ключевые отличия
- Supports direct interfacing with both 3 V and 5 V microcontrollers (против TCAN1044A-Q1)
- Documents ISO 11898-2:2003 and ISO 11898-5:2007 support (против TCAN1044A-Q1)
- Provides established TJA1040 application compatibility (против TCAN1044A-Q1)
Заметки по проектированию
Place the TJA1049T close to the CAN connector and external protection network so the CANH and CANL route to the bus through minimal PCB distance. Keep the CAN traces away from switching nodes, clocks, and high-current motor paths. Follow the manufacturer layout guidance for supply decoupling and ground return. The exact capacitor values and exposed-bus spacing must be taken from the complete datasheet because those values are not present in the supplied verified excerpts.
Do not treat pin compatibility alone as proof of equivalent behavior. The verified TI discussion states that TCAN1044A-Q1 and TJA1049T have identical pinout and function but respond differently to recessive-to-dominant and dominant-to-recessive-to-dominant wake-up sequences. If existing firmware tests a specific bus wake-up event, modify the test and review the state-machine timing before substituting the part without PCB changes.
Confirm the separate logic-side and transceiver-side supply requirements from the exact ordering code before connecting VIO and VCC. The verified manufacturer statement establishes direct interfacing with 3 V to 5 V microcontrollers, but it does not provide complete current, quiescent-current, or voltage-range tables. Provide local decoupling according to the datasheet and avoid sharing noisy return current between the transceiver and bus-protection components.
CANH and CANL form a differential high-speed bus, so the external protection device, connector, and return path must be selected for the installation's ESD, surge, and common-mode requirements. Automotive and industrial cable environments may need protection beyond the transceiver's internal capabilities. The provided evidence does not include the complete EMC or protection ratings, so field and compliance testing must use the manufacturer limits rather than assumed values.
Информация о соответствии
The supplied sources identify automotive temperature grade and support for ISO 11898 standards, but they do not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields therefore remain unknown pending review of current NXP documentation for the exact ordering code.