TJA1042 - 5 Mbit/s High-Speed CAN FD Transceiver | NXP
料号： TJA1042 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.2 | $1.20 |
| 10 | $1.05 | $10.50 |
| 100 | $0.85 | $85.00 |
| 500 | $0.72 | $360.00 |
| 1,000 | $0.61 | $610.00 |
TJA1042 概述
A CAN transceiver is the physical-layer device that converts controller TXD/RXD logic levels into differential bus signals (CANH/CANL) and back. Within the interface IC hierarchy, it sits between the microcontroller CAN peripheral and the bus wiring, and is essential for robust automotive and industrial networking in electrically noisy environments.
Key features include a Standby mode with very low current consumption for always-on, wake-on-CAN applications; undervoltage detection on VCC; a SPLIT pin that stabilizes the recessive bus level on long networks; improved slope control; and high DC handling capability on the bus pins. As a third-generation NXP transceiver, the TJA1042 combines the functionality of the PCA82C250, PCA82C251 and TJA1040 with improved EMC and ESD performance and lower quiescent current. Thermal shutdown protection and wide supply tolerance further increase robustness.
Architecturally, the TJA1042 uses a differential transceiver core with integrated common-mode stabilization and slope control, meeting demanding automotive EMC requirements without external filtering in most designs.
Typical applications include automotive body control modules, gateway modules, engine control units, and industrial automation systems requiring standards-compliant CAN or CAN FD communication. Standby mode directly benefits nodes that must wake on bus activity while minimizing sleep current.
Design tip: terminate the bus with 120 ohms at each end, keep the transceiver close to the connector to minimize stub length, and follow NXP application hint document AH1308 for SPLIT-pin usage to improve signal integrity on long bus lines.
直接替换替代料： TJA1042 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TJA1042 （相同外形与封装尺寸） ——差异在于 Package, Protocol, Fault Protection, Function.
快速对比工具——选择替代料号进行并排对比：
TJA1042T/3,118
✅ 直接替换📋 参考替代料（不在目录中）
TJA1042TK
✅ 直接替换📋 参考替代料（不在目录中）
TJA1042BTK
✅ 直接替换📋 参考替代料（不在目录中）
TCAN1042GVDRQ1
✅ 直接替换✓ 有现货
$0.349 / 个
查看数据手册 →TCAN1051-Q1
✅ 直接替换✓ 有现货
$1.05 / 个
查看数据手册 →TCAN1044A-Q1
✅ 直接替换📋 参考替代料（不在目录中）
TJA1042 规格参数
| 功能 | High-speed CAN transceiver with Standby mode |
| 数据速率 | Up to 5 Mbit/s (CAN FD fast phase) |
| Standards Compliance | ISO 11898-2:2016, SAE J2284-1 to J2284-5 |
| Number of Transceivers | 1 |
| Standby Mode | Yes, low-current wake-on-CAN |
| SPLIT Pin | Yes, stabilizes recessive bus level |
| Undervoltage Detection | On VCC |
| 热关断 | Yes |
| ESD Performance | Improved vs PCA82C250/TJA1040 generation |
| 封装 | SOIC-8 (SOT96-1) |
| 安装类型 | Surface Mount |
| Automotive Qualification | Designed for automotive high-speed CAN applications |
| Predecessor Parts Replaced | PCA82C250, PCA82C251, TJA1040 |
TJA1042 引脚配置
| 引脚 1 | TXD — Transmit data input from CAN controller |
| 引脚 2 | GND — Ground |
| 引脚 3 | VCC — Supply voltage |
| 引脚 4 | RXD — Receive data output to CAN controller |
| 引脚 5 | SPLIT — Common-mode stabilization output (VCC/2 in recessive state) |
| 引脚 6 | CANL — CAN low-level bus line |
| 引脚 7 | CANH — CAN high-level bus line |
| 引脚 8 | STB — Standby mode control input |
典型应用
TJA1042 适用于 6 应用s: Automotive Body Control Modules, Gateway and Central Control Modules, Engine Control Units (ECU), Industrial Automation Networks, Battery Management Systems, Agricultural and Off-Highway Vehicles.
Automotive Body Control Modules
The TJA1042 fits body control modules (BCMs) because its Standby mode draws very low quiescent current, allowing the ECU to sleep while retaining wake-on-CAN capability when bus activity occurs. Its ISO 11898-2:2016 compliance and improved ESD handling on the CANH/CANL pins withstand the harsh transients typical of vehicle body harnesses. Placed between the MCU CAN controller and the twisted-pair bus with a 100nF VCC decoupling capacitor, the transceiver's integrated slope control often eliminates the need for external common-mode chokes, reducing BOM cost in high-volume BCM designs.
推荐
Gateway and Central Control Modules
Vehicle gateways bridge multiple CAN and CAN FD segments, so transceiver propagation delay directly limits topology size. The TJA1042B variant offers shorter propagation delay than the base TJA1042, supporting larger star or hybrid topologies at 5 Mbit/s CAN FD data phases. The SPLIT pin stabilizes recessive common-mode levels on longer backbone segments, improving EMC margin per NXP application hint AH1308. Standby mode allows unused gateway branches to power down, and VCC undervoltage detection ensures clean bus release during crank or load-dump events.
推荐
Engine Control Units (ECU)
Engine control units demand transceivers that survive extreme electrical environments: jump-start voltages, load dump, and ground shift. The TJA1042's high DC handling capability on the bus pins and thermal shutdown protection address these conditions directly. Its 5 Mbit/s CAN FD capability supports modern powertrain networks carrying injector and combustion diagnostics at higher frame rates. According to the NXP datasheet Rev. 11, the improved slope control meets demanding automotive EMC limits without external filtering in most layouts, which matters in the electrically dense engine bay where every square millimeter of PCB counts.
推荐
Industrial Automation Networks
In factory automation, CAN and CAN FD link motor drives, I/O modules, and sensors on buses that run for tens of meters near VFDs and switching loads. The TJA1042's SPLIT pin actively drives VCC/2 during recessive bits, stabilizing common-mode voltage on long lines and reducing radiated emissions. The transceiver's wide supply tolerance and undervoltage detection protect network integrity during brownouts. With 5 Mbit/s CAN FD support per ISO 11898-2:2016, deterministic machine-control cycles benefit from shorter frame times without sacrificing the robustness classical CAN deployments rely on.
推荐
Battery Management Systems
Battery management systems in EVs and industrial energy storage use CAN to report cell voltages, temperatures, and fault states to the vehicle controller. The TJA1042's very low Standby current suits BMS nodes that must sleep for months in storage yet wake instantly on the first bus message. High ESD robustness on the bus pins withstands handling and service transients, and VCC undervoltage detection guarantees the bus pins release cleanly if the pack-side supply collapses. Placing the transceiver near the connector with 120 ohm end-of-line termination preserves signal integrity for 5 Mbit/s CAN FD telemetry.
推荐
Agricultural and Off-Highway Vehicles
Tractors, harvesters, and construction equipment run SAE J1939 networks built on high-speed CAN, exactly the SAE J2284-1 to J2284-5 physical layer the TJA1042 implements. Long wiring harnesses across the chassis benefit from the SPLIT pin common-mode stabilization, while the transceiver's high DC bus-pin handling tolerates 24V system transients and fault conditions on the bus. Standby mode lets telematics nodes sleep between wake-on-CAN events. The 5 Mbit/s CAN FD capability also supports ISOBUS implement-to-terminal communication upgrades without replacing the physical layer design.
推荐
推荐产品汇总
工程参考数据： TJA1042 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TJA1042T/3,118 | TJA1042BTK | TCAN1042GVDRQ1 | TCAN1044A-Q1 |
|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | Texas Instruments |
| CAN FD Data Rate | Up to 5 Mbit/s | Up to 5 Mbit/s | Up to 5 Mbit/s (shorter delay) | Up to 5 Mbit/s | Up to 5 Mbit/s |
| Pin 5 Function | SPLIT | SPLIT | SPLIT | VIO or NC | VIO or NC |
| Standards | ISO 11898-2:2016, SAE J2284-1..5 | ISO 11898-2:2016, SAE J2284-1..5 | ISO 11898-2:2016, SAE J2284-1..5 | ISO 11898-2:2016 | ISO 11898-2:2016 |
关键差异点
- SPLIT pin for recessive common-mode stabilization （对比 TCAN1042GVDRQ1)
- Lower VCC undervoltage threshold （对比 TCAN1042GVDRQ1)
- Shorter propagation delay variant available in same footprint （对比 TJA1042T/3,118)
设计说明
Place a 100nF ceramic decoupling capacitor within 5 mm of the VCC pin (pin 3) with a solid ground return to pin 2. Route CANH (pin 7) and CANL (pin 6) as a tightly coupled differential pair, and position the transceiver as close to the bus connector as possible to minimize stub length. Follow the NXP reference schematic in datasheet Rev. 11 for the recommended external component values.
When replacing the TJA1042 with TCAN1042/TCAN1044A, verify pin 5 handling: the TJA1042 SPLIT pin becomes VIO or NC on TI parts. Per TI E2E guidance, connecting the SPLIT net to the TI no-connect pin is acceptable, but do not tie it to a rail on the VIO variant without checking I/O level requirements. Also note the undervoltage threshold shift (3.5V NXP vs 3.8V TCAN1042H).
Terminate the bus with 120 ohms at each physical end. On long backbones, use the SPLIT pin with two series resistors (typically 10-60 ohm) to a split-termination capacitor network per NXP application hint AH1308 to stabilize recessive common-mode voltage and reduce emissions. Excessive stub length or missing termination corrupts the 5 Mbit/s CAN FD data phase first, since bit times shrink to 200 ns or less.
The TJA1042 provides VCC undervoltage detection that releases the bus cleanly during supply dips, so power sequencing with the MCU is not required. Still, ensure VCC decays are not chronically near the 3.5V threshold in crank conditions, or the node will drop off the bus intermittently. Thermal shutdown protects during bus short-to-VCC faults but is not a substitute for correct bus wiring.
合规信息
NXP markets the TJA1042 as designed for automotive high-speed CAN applications; NXP automotive interface products are generally AEC-Q100 qualified, but confirm per ordering part suffix on nxp.com. RoHS/lead-free status not stated in provided data - verify on NXP part page.
