SIT1040T - 5V CAN Transceiver, SO-8, 1Mbps | SIT
料号： SIT1040T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.3 | $0.30 |
| 10 | $0.27 | $2.70 |
| 100 | $0.25 | $25.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.2 | $200.00 |
SIT1040T 概述
A CAN transceiver (Controller Area Network transceiver) is a physical-layer (PHY) IC that converts the differential CAN_H/CAN_L bus signals into the single-ended TXD/RXD logic levels required by a CAN protocol controller. It sits between the CAN controller (usually embedded in a MCU or an external controller such as an MCP2515) and the physical two-wire bus, providing the dominant/recessive differential signaling, current drive for the bus, and protection against ESD/overvoltage transients that occur in automotive and industrial environments. CAN transceivers are essential building blocks of in-vehicle networking (IVN), industrial automation, and any distributed embedded system requiring robust multi-node communication up to 1 Mbps over long cables.
The SIT1040T integrates thermal shutdown, short-circuit protection (70 mA drive), TXD dominant time-out to prevent permanent bus blocking if the controller fails, and a very low-current standby mode with remote wake-up capability. These features collectively support functional safety by preventing a single faulty node from disabling the entire bus (dominant time-out) and reducing quiescent current when the ECU enters sleep mode. The 5V supply and ±40V bus tolerance make it well-suited for 12V automotive and 24V industrial bus rails.
Internally, the device uses a differential driver and receiver architecture based on a bandgap reference and current-mode loop, achieving the 1 Mbps signaling rate required by ISO 11898-1 high-speed CAN. Bus-side ESD protection is integrated, and the ±40V tolerant bus pins survive load-dump and jump-start transients commonly seen in 12V automotive systems. The receiver provides a recessive bias on the bus to maintain defined bus levels when no node is transmitting.
Typical applications include automotive ECU body and chassis CAN bus nodes, industrial PLC and inverter CAN communication, building automation (BACnet via CAN), medical instrument inter-board communication, and any 5V embedded system requiring an ISO 11898 high-speed CAN link. The SO-8 package makes it well-suited for compact PCBs and retrofit upgrades of legacy designs that previously used TJA1050 or PCA82C250.
When designing with the SIT1040T, add a 5V TVS diode (e.g., SMBJ5.0CA) and a common-mode choke on the bus for EMC robustness in automotive installations, and place a 100 nF decoupling capacitor within 5 mm of the VCC pin. The TXD dominant time-out setting is internal and cannot be disabled - design the firmware to keep TXD dominant periods under the device's timeout window.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical EMC design notes that are not found in the manufacturer datasheet alone.
直接替换替代料： SIT1040T ——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：
SIT1040T
✅ 直接替换✓ 有现货
$0.2 / 个
查看数据手册 →SIT1050T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TJA1050T
✅ 直接替换📋 参考替代料（不在目录中）
MCP2551-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
PCA82C250T
✅ 直接替换📋 参考替代料（不在目录中）
SN65HVD251DR
✅ 直接替换📋 参考替代料（不在目录中）
NCV7351D10R2G
✅ 直接替换📋 参考替代料（不在目录中）
SIT1040T 规格参数
| Product Type | High-Speed CAN Transceiver (PHY) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V (typical 5 V) |
| Bus Fault Protection | ±40 V on CANH/CANL |
| Maximum Data Rate | 1 Mbps (ISO 11898-1 HS-CAN) |
| Standard Compliance | ISO 11898 |
| Logic Level Compatibility | 3.3 V and 5 V MCU TXD/RXD |
| Bus Drive Current | 70 mA |
| 工作温度 | -40 C to +125 C |
| Thermal Protection | Thermal shutdown |
| TXD Dominant Time-out | Yes (prevents permanent bus dominant) |
| Remote Wake-up | Yes (low-power standby mode) |
| Short-Circuit Protection | Yes (bus pins to GND/VCC) |
| 封装 | SO-8 (SOP-8) |
| RoHS 状态 | Compliant |
SIT1040T 引脚配置
| 引脚 1 | TXD — Transmit data input from CAN controller; dominant = LOW |
| 引脚 2 | GND — Ground |
| 引脚 3 | VCC — 5V supply voltage (4.5V to 5.5V) |
| 引脚 4 | RXD — Receive data output to CAN controller; LOW = dominant |
| 引脚 5 | VIO — Logic-level reference (for 3.3V MCU compatibility) |
| 引脚 6 | CANL — CAN bus low-side line |
| 引脚 7 | CANH — CAN bus high-side line |
| 引脚 8 | STB — Standby mode control (HIGH = normal, LOW = standby) |
典型应用
SIT1040T 适用于 7 应用s: Automotive ECU CAN Bus Node, Industrial PLC and Inverter Communication, Building Automation BACnet over CAN, Medical Device Inter-Board Communication, Electric Vehicle Charging Station CAN Bus, Agricultural Machinery CAN Network, Robotics and Drone Motor Controller Networks.
Automotive ECU CAN Bus Node
The SIT1040T's 5V supply, ±40V bus fault tolerance, and 1 Mbps ISO 11898 compliance make it ideal for automotive ECU body, chassis, and powertrain CAN bus nodes. At 12V vehicle bus rails, the device survives load-dump and jump-start transients up to ±40V without external TVS, reducing BOM cost. Its TXD dominant time-out prevents a stuck node from blocking the entire bus, a critical functional-safety requirement in automotive networks. The integrated thermal shutdown and -40C to +125C operating range support under-hood mounting.
推荐
Industrial PLC and Inverter Communication
On factory floors, the SIT1040T connects PLCs, variable-frequency drives (VFDs), and servo inverters over robust CAN bus links. Its ±40V bus tolerance handles the 24V industrial bus rail and inductive switching transients from motor inverters, eliminating the need for external protection. The 1 Mbps data rate supports real-time motion control loops between the PLC and distributed servo drives. The wide -40C to +125C range tolerates unconditioned cabinet environments with high ambient temperatures.
推荐
Building Automation BACnet over CAN
HVAC and lighting controllers in commercial buildings often use CAN-derived BACnet protocols for inter-device communication. The SIT1040T's 5V supply matches typical building-automation backplanes, and the 1 Mbps data rate supports hundreds of nodes on a single bus segment with the long cable lengths specified by ISO 11898. The remote wake-up feature enables low-power sleep modes for battery-backed lighting sensors. The integrated bus protection reduces field-failure rates caused by miswired installations.
推荐
Medical Device Inter-Board Communication
Inside patient monitors, infusion pumps, and diagnostic instruments, the SIT1040T provides reliable CAN communication between sensor boards, display modules, and main controllers. Its low standby current enables sleep modes on battery-powered portable instruments, while the ISO 11898 compliance ensures deterministic latency critical for real-time vital-sign monitoring. The integrated thermal shutdown prevents overheating failures in enclosed medical-device housings, supporting IEC 60601 reliability expectations.
推荐
Electric Vehicle Charging Station CAN Bus
EV charging stations use CAN bus between the charging controller, the vehicle's BMS (Battery Management System), and the HMI module per IEC 61851 and ISO 15118 protocols. The SIT1040T's ±40V fault tolerance handles the high-voltage coupling transients common in charging environments, and the 1 Mbps rate supports the handshake messaging between charger and vehicle. Its 3.3V MCU compatibility allows direct connection to modern EV-controller MCUs without level shifters.
推荐
Agricultural Machinery CAN Network
Tractors, harvesters, and precision-agriculture implements use CAN bus (ISO 11783 / ISOBUS) for real-time implement control and telemetry. The SIT1040T's -40C to +125C operating range handles the extreme temperature swings of outdoor agricultural environments, from winter cold to summer direct sun. The ±40V bus fault tolerance protects against alternator transients and jump-start events on 24V tractor electrical systems, reducing warranty returns.
推荐
Robotics and Drone Motor Controller Networks
Multi-axis robotic arms and commercial drones use CAN bus between motor controllers (e.g., ODrive, VESC) and the central flight/control processor. The SIT1040T's 1 Mbps data rate supports the high-update-rate torque commands needed for stable drone flight, while its low standby current extends battery life when the drone is disarmed. The compact SO-8 package fits into the tight PCB area of ESC (Electronic Speed Controller) boards, where every square millimeter matters.
推荐
推荐产品汇总
工程参考数据： SIT1040T ——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 | TJA1050T | MCP2551-I/SN | SN65HVD251DR | NCV7351D10R2G | PCA82C250T |
|---|---|---|---|---|---|---|
| Brand | SIT | NXP Semiconductors | Microchip Technology | Texas Instruments | onsemi | NXP Semiconductors |
| Package | SO-8 | SO-8 - same | SO-8 - same | SO-8 - same | SO-8 - same | SO-8 - same |
| Supply Voltage | 4.5V to 5.5V (5V typ) | 4.5V to 5.5V (5V typ) | 4.5V to 5.5V (5V typ) | 4.5V to 5.5V (5V typ) | 4.5V to 5.5V (5V typ) | 4.5V to 5.5V (5V typ) |
| Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| Bus Fault Tolerance | ±40V | ±40V | ±40V | ±36V | ±40V | ±40V |
| Logic Level Compatibility | 3.3V and 5V | 5V only (VIO-less legacy) | 5V only | 5V (with Vio for 3.3V) | 5V | 5V only |
| TXD Dominant Time-out | Yes | Yes | No | Yes | Yes | No |
| Standby / Remote Wake | Yes (low-current, wake-up) | Yes (low-current standby) | No (no standby mode) | Yes (standby mode) | Yes (standby + wake) | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +85C (industrial); -40C to +125C (ext) | -40C to +125C | -40C to +125C | -40C to +125C |
| Automotive Grade (AEC-Q100) | Not qualified (industrial) | Yes (AEC-Q100) | No (industrial) | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (legacy automotive grade) |
关键差异点
- 3.3V/5V logic-level compatibility on TXD/RXD without level shifters （对比 MCP2551-I/SN (Microchip))
- Integrated TXD dominant time-out and remote wake-up in one package （对比 TJA1050T (NXP))
- ±40V bus fault tolerance matches or exceeds cross-brand competition （对比 SN65HVD251DR (Texas Instruments))
设计说明
Place a 100 nF X7R ceramic decoupling capacitor within 5 mm of the VCC pin (pin 3) on the top layer, with a via to the ground plane. Add a 4.7 uF tantalum or polymer bulk capacitor near the transceiver to handle CAN bus inrush currents during bus dominant-to-recessive transitions. Keep the GND pin (pin 2) tied directly to the ground plane with a short, wide trace or two dedicated vias to minimize ground bounce.
For automotive and industrial installations subject to ISO 7637 and IEC 61000-4 surge tests, add an SMBJ5.0CA or SMAJ5.0CA bidirectional TVS diode from each of CANH and CANL to ground, placed within 10 mm of the bus connector. Add a common-mode choke (e.g., DLW43SH or similar 100 ohm @ 100 MHz CMC) in series with CANH/CANL to attenuate common-mode emissions above 30 MHz and improve radiated EMI performance under CISPR 25 testing.
Do not leave the STB pin (pin 8) floating - tie it to VCC via a 100 kohm pull-up to enable normal operation, or to GND for forced standby mode. Note that the TXD dominant time-out window is internal and fixed - firmware must not hold TXD LOW for longer than the device's time-out period (typically ~1 ms) or the transceiver will release the bus to recessive, causing packet loss in streaming protocols.
At maximum bus load current of 70 mA and worst-case VCC of 5.5V, the SO-8 package dissipates approximately 0.4 W into the bus when driving a 60 ohm bus load. With SO-8 thermal resistance (theta_JA) of approximately 110 C/W on a 2-layer 1oz PCB, the junction-to-ambient rise is roughly 44 C - acceptable within the 125 C limit but rising to ~73 C on a 1-layer board. For dense layouts with multiple transceivers, use copper pours on both top and bottom layers to keep junction rise below 30 C.
Use a twisted pair for CANH and CANL routing with characteristic impedance near 120 ohm (per ISO 11898), and place a 120 ohm +/- 1% termination resistor at each end of the bus only - not at every node. Long stubs from the bus to each transceiver should be kept under 0.3 m to avoid reflections at 1 Mbps. Confirm that the bus capacitance (cable + node input capacitance, typically 50 pF max per node) does not exceed the ISO 11898 limit for the chosen cable length.
合规信息
RoHS compliant per JLCPCB product page. NOT AEC-Q100 qualified - select NCV7351D10R2G or TJA1050T for automotive Grade-0/1 applications. Conflict mineral status not stated in public excerpts.
