TJA1049T - 3V to 5V High-Speed CAN Transceiver | NXP
N.º de pieza: TJA1049T ✓ ActivoTJA1049T Descripción general
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.
Alternativas directas para TJA1049T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con TJA1049T (mismo factor de forma y huella) — difiere en Package.
TCAN1044A-Q1
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TJA1049T Especificaciones
| 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 |
| Número de pines | 8 pins |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | 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 |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Status | unknown |
Configuración de pines de TJA1049T
| Pin 1 | TXD — Transmit data input |
| Pin 2 | GND — Ground |
| Pin 3 | VCC — Transceiver supply voltage |
| Pin 4 | RXD — Receive data output |
| Pin 5 | STB — Standby control input |
| Pin 6 | CANH — CAN high bus line |
| Pin 7 | CANL — CAN low bus line |
| Pin 8 | VIO — Logic-side supply voltage for the controller interface |
Aplicaciones típicas
TJA1049T es adecuado para 6 aplicacións: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TJA1049T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 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 |
Diferenciadores clave
- Supports direct interfacing with both 3 V and 5 V microcontrollers (frente a TCAN1044A-Q1)
- Documents ISO 11898-2:2003 and ISO 11898-5:2007 support (frente a TCAN1044A-Q1)
- Provides established TJA1040 application compatibility (frente a TCAN1044A-Q1)
Notas de diseño
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.
Información de cumplimiento
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.