TJA1048 - Dual High-Speed CAN Transceiver, SOIC-14 | NXP
料号： TJA1048 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.51 | $25.10 |
| 100 | $1.95 | $195.00 |
| 500 | $1.65 | $825.00 |
| 1,000 | $1.42 | $1,420.00 |
TJA1048 概述
A high-speed CAN transceiver (HS-CAN transceiver) is the physical-layer interface IC that converts digital transmit/receive logic levels from a CAN controller (typically an MCU or SBC) into the differential dominant/recessive voltage signaling on a CAN bus, while also providing bus fault protection, ESD robustness, and low-power modes. The transceiver operates at the lowest tier of the OSI layered model, beneath the CAN data link layer (typically handled in the MCU's CAN controller). The TJA1048 belongs to NXP's third-generation HS-CAN family, offering improved electromagnetic compatibility (EMC) and quiescent-current performance compared with first-generation devices such as the TJA1040, while combining two complete transceivers into a single package to save board space on dual-bus automotive ECUs.
Key features of the TJA1048 include very low quiescent current in Standby mode for battery-connected nodes, robust ±8 kV HBM ESD handling on the bus pins, bus terminal short-to-battery and short-to-ground protection, thermal shutdown, and a transmit-data (TXD) dominant-timeout function that prevents the bus from being permanently driven dominant by a stuck TXD pin. The split termination pin (STB/VIO reference) and the dedicated Standby control input allow the system MCU to selectively power down one or both channels when the bus is idle.
The TJA1048 architecture places each transceiver channel as an independent differential line driver with slope-controlled output stages to limit electromagnetic emissions and meet automotive OEM EMC requirements. A common-mode stabilization circuit maintains bus symmetry across wide ground-offset conditions encountered in 12 V and 24 V vehicle networks, allowing reliable communication even during transient events such as engine cranking or load dump.
Typical applications include automotive body-control modules, gateway ECUs that bridge CAN and CAN-FD buses, dual-channel infotainment network nodes, industrial CAN-IO modules with redundant bus interfaces, and OBD-II diagnostics adapters that monitor two independent CAN networks simultaneously. The device is qualified per AEC-Q100 and supports the operating temperature range required under the -40 C to +125 C automotive grade.
When designing with the TJA1048, pay attention to bus termination: a 120 ohm split-termination network (60 ohm plus 60 ohm with a capacitor to ground) at each end of the bus is recommended to suppress common-mode emissions. The Standby pin transitions must respect the minimum bus-idle detection time before remote wake-up is acknowledged, otherwise the bus remains silent. According to NXP, unused channels should still have their TXD tied high (recessive) to avoid accidental bus dominance.
This page synthesizes distributor pricing, drop-in alternatives from NXP and TI, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： TJA1048 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TJA1048T,118
✅ 直接替换📋 参考替代料（不在目录中）
TJA1048T
✅ 直接替换📋 参考替代料（不在目录中）
TCAN1048AV-Q1
✅ 直接替换📋 参考替代料（不在目录中）
TCAN1046-Q1
✅ 直接替换📋 参考替代料（不在目录中）
TJA1048 规格参数
| Product Type | Dual High-Speed CAN Transceiver |
| Number of Channels | 2 (dual independent transceivers) |
| CAN Standard | ISO 11898-2:2016 (High-Speed CAN physical layer) |
| Bus Fault Protection | Short to battery, short to GND, thermal shutdown |
| 工作温度 | -40 C to +125 C (automotive grade) |
| 封装 | SOIC-14 (14-SO) |
| 安装类型 | Surface Mount |
| Low-Power Mode | Standby mode with remote wake-up |
| Automotive Qualification | AEC-Q100 qualified |
| RoHS 状态 | Compliant |
| TXD Dominant Timeout | Yes (prevents bus lockup) |
TJA1048 引脚配置
| 引脚 1 | TXD1 — Transmit data input channel 1 |
| 引脚 2 | GND — Ground |
| 引脚 3 | VCC — Supply voltage (5V typical) |
| 引脚 4 | RXD1 — Receive data output channel 1 |
| 引脚 5 | VIO — Logic level supply for digital I/O |
| 引脚 6 | CANH1 — CAN high bus pin channel 1 |
| 引脚 7 | CANL1 — CAN low bus pin channel 1 |
| 引脚 8 | STB — Standby mode control input |
| 引脚 9 | TXD2 — Transmit data input channel 2 |
| 引脚 10 | GND — Ground |
| 引脚 11 | VCC — Supply voltage (5V typical) |
| 引脚 12 | RXD2 — Receive data output channel 2 |
| 引脚 13 | CANH2 — CAN high bus pin channel 2 |
| 引脚 14 | CANL2 — CAN low bus pin channel 2 |
典型应用
TJA1048 适用于 6 应用s: Automotive Gateway ECU, Body Control Module (BCM), Industrial CAN-IO Module with Redundant Bus, OBD-II Diagnostics Adapter, Agricultural and Off-Highway Vehicle Networks, Rooftop Solar Inverter with CAN Monitoring.
Automotive Gateway ECU
The TJA1048 is ideal for automotive gateway ECUs that bridge two or more CAN networks, because it provides two complete ISO 11898-2:2016 high-speed CAN transceivers in one SOIC-14 package, halving the PCB footprint versus dual discrete parts. Each channel's robust bus-fault handling (short-to-battery, short-to-ground, thermal shutdown, ±8 kV HBM ESD) tolerates the harsh 12V automotive environment, while Standby mode allows the gateway to enter low-power sleep when the vehicle is parked. Pair with NXP S32K3 MCU running CAN-FD stack.
推荐
Body Control Module (BCM)
Body control modules benefit from the TJA1048's dual-channel architecture because lighting, door, mirror, and seat buses often run on separate CAN segments requiring independent transceivers. The device's -40 to +125 C operating range meets under-hood and cabin AEC-Q100 requirements, while very low Standby quiescent current preserves battery life in always-on BCM applications. Use both channels for interior and exterior bus, or for redundant communication paths.
推荐
Industrial CAN-IO Module with Redundant Bus
Industrial CAN-IO modules with redundant bus architectures use the TJA1048 to drive two independent CAN lines from a single host controller, allowing automatic switchover if one physical bus fails. According to NXP, both channels meet ISO 11898-2:2016 with slope-controlled outputs that reduce EMI on long factory floor cables, and TXD dominant timeout prevents an MCU lockup from freezing a production line. Split-termination (60+60 ohm) on each bus minimizes common-mode emissions.
推荐
OBD-II Diagnostics Adapter
OBD-II scan tools and vehicle diagnostics adapters benefit from the TJA1048's dual transceiver channels, one connected to the high-speed CAN bus (pins 6, 14) and the other to the optional MS-CAN or other vehicle sub-bus. According to NXP, the device's 5 V-tolerant digital interface and 3.3 V-compatible MCU I/O simplify integration with battery-powered diagnostic handhelds. Standby current extends handheld battery life between diagnostic sessions.
推荐
Agricultural and Off-Highway Vehicle Networks
Agricultural tractors, construction equipment, and off-highway vehicles use isolated CAN bus segments where the TJA1048's wide common-mode tolerance and robust ESD protect the host ECU from ground-offset transients on long harnesses. According to NXP, the device is rated for severe thermal and vibration environments typical of off-road machinery, with Standby mode supporting deep-sleep for battery-powered implements. Use one channel for drivetrain and one for implement ISOBUS communications.
推荐
Rooftop Solar Inverter with CAN Monitoring
Commercial solar inverters use isolated CAN networks to string-monitoring modules across the array, and the TJA1048 fits rooftop inverter control boards that need two CAN channels (one to the BMS, one to the plant SCADA gateway). According to NXP, the device's robustness against load-dump and surge events matches the IEC 61000-4-5 levels encountered in PV installations. Low-power Standby supports overnight low-voltage disconnect compliance.
推荐
推荐产品汇总
工程参考数据： TJA1048 ——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 | TJA1048T,118 | TJA1048T | TCAN1048AV-Q1 | TCAN1046-Q1 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | Texas Instruments |
| Package | SOIC-14 | SOIC-14 - same | SOIC-14 - same | SOIC-14 - same | SOIC-14 - same |
| Number of Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| CAN Standard | ISO 11898-2 (HS-CAN) | ISO 11898-2 (HS-CAN) | ISO 11898-2 (HS-CAN) | ISO 11898-2 (HS-CAN) | ISO 11898-2 with CAN-FD optimization |
| Standby Mode | Yes (with remote wake-up) | Yes | Yes | Yes | Yes |
| Automotive Grade | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| Pin-to-Pin Compatible | Reference | Yes | Yes | Yes (per TI E2E) | No (pinout differs) |
关键差异点
- Third-generation NXP HS-CAN with improved EMC （对比 TJA1040 (first generation))
- Two transceivers in one SOIC-14 package （对比 Discrete dual-chip solution (e.g., 2x TJA1042))
- Pin-to-pin second-source via TI TCAN1048AV-Q1 （对比 NXP-only single source)
设计说明
Use split termination on each CAN bus (60 ohm resistor from CANH to STB/VIO reference, 60 ohm from CANL to ground, with a 4.7 nF-100 nF capacitor from the midpoint to ground). According to NXP, split termination reduces common-mode emissions and improves EMC margins versus traditional 120 ohm single-resistor termination. Place the termination as close as possible to the bus connector, not the transceiver, to maximize its effectiveness.
Tie the TJA1048 STB (Standby) pin through a 10 kohm pull-up to VIO if Standby mode is not used in the application; otherwise drive it from a GPIO of the host MCU. According to NXP, allowing the STB pin to float can cause unpredictable mode transitions during power-up. Decouple both VCC and VIO with 100 nF ceramic capacitors placed within 5 mm of the respective supply pins to suppress transient load events.
Do not leave unused channel TXD pins floating. According to NXP, an unused TXD pin must be tied high (recessive) through a pull-up resistor to prevent a floating input from causing spurious dominant bits on the bus. Similarly, the unused channel's RXD can be left open-circuit only if no software expects its state; tying it to a defined logic level via a pull-up is safer for safety-critical firmware.
合规信息
AEC-Q100 qualified per NXP product page. RoHS and REACH compliant. Halogen-free status not stated in verified web data - verify with NXP datasheet environmental section before use in halogen-free assemblies.
