SIT1044TK/3 - 5Mbps CAN FD Transceiver | SIT | TDFN-8
料号： SIT1044TK/3 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.234 | $0.23 |
| 10 | $0.214 | $2.14 |
| 100 | $0.205 | $20.50 |
| 500 | $0.198 | $99.00 |
| 1,000 | $0.192 | $192.00 |
| 3,000 | $0.184 | $552.00 |
SIT1044TK/3 概述
A CAN FD transceiver is a physical-layer interface IC that converts the differential CAN protocol levels (CANH/CANL) on the bus into logic-level TX/RX signals that a microcontroller can drive and decode. CAN FD is the high-bandwidth evolution of classic CAN 2.0B, allowing payload sizes beyond 8 bytes and bit rates up to 5 Mbps in the data phase. The SIT1044TK/3 sits in the hierarchy CAN transceiver → automotive/industrial bus interface → power management & signal conditioning, and is fully compliant with the ISO 11898 standard for physical-layer compatibility.
Key features include low-power standby mode with bus wake-up, a TXD dominant time-out function to prevent the network from being locked into a dominant state by a faulty MCU, ±40 V bus fault protection, thermal shutdown, under-voltage protection, and very low ElectroMagnetic Emission (EME). The TDFN-8-EP 3x3 mm package provides a low thermal-resistance path through the exposed pad, enabling sustained bus-fault and short-circuit robustness.
The SIT1044T/3 and SIT1044TK/3 can interface directly to microcontrollers with supply voltages from 3.3 V to 5 V, simplifying logic-level translation. Timing is guaranteed at 5 Mbps in the CAN FD fast phase, and the unpowered transceiver disengages from the bus (zero load), preventing it from disturbing other nodes when VCC is removed. The design uses precision differential drivers and receivers tuned for low EME common-mode behaviour, reducing both conducted and radiated emissions on the CAN bus.
Typical applications include automotive body and chassis CAN nodes, industrial CAN/CANopen networks, building automation (BACnet), battery management system (BMS) communication, and any MCU-based system needing robust differential CAN communication. It is commonly paired with NXP/Freescale, STM32, and Infineon AURIX microcontrollers. Pricing on LCSC is approximately $0.2034 per unit (as of 2026-10-10) with 16,000+ units in stock, making it one of the most cost-optimized 5-Mbps CAN FD transceivers in this footprint.
When designing with the SIT1044TK/3, place the TDFN-8-EP exposed pad on a copper pour of at least 10 mm² for thermal dissipation, keep the CANH/CANL traces as a 100-Ω differential pair, and add a 100 nF decoupling capacitor adjacent to VCC. A split-termination network (60 Ω + 60 Ω + 4.7 nF to GND) at the bus end improves signal integrity and EME performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical CAN-bus design notes that are not collected in the manufacturer datasheet — providing the cross-reference and decision support engineers need when evaluating the SIT1044K family against competing CAN FD transceivers.
直接替换替代料： SIT1044TK/3 ——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： SIT1044TK/3 （相同外形与封装尺寸） ——差异在于 Bus Fault Protection, Low-Power Mode, Package.
快速对比工具——选择替代料号进行并排对比：
SIT1044T/3
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LX1044TK/3-03
✅ 直接替换📋 参考替代料（不在目录中）
TCAN334GDR
✅ 直接替换📋 参考替代料（不在目录中）
TCAN334GDRCT
✅ 直接替换📋 参考替代料（不在目录中）
SIT1044TK/3 规格参数
| Protocol | CAN FD (ISO 11898) |
| Maximum Bus Data Rate | 5 Mbps |
| Supply Voltage (VCC) | 4.75 V to 5.25 V |
| Supply Current (Active, Dominant) | 70 mA |
| Standby Supply Current | 5 µA |
| Bus Fault Protection | ±40 V |
| 工作温度范围 | -40 to +125 °C |
| Logic Interface Voltage | 3.3 V to 5 V |
| 封装 | TDFN-8-EP (3x3 mm) |
| 安装类型 | Surface Mount |
| ESD Protection | Yes (±8 kV HBM typical, per datasheet) |
| 热关断 | Yes |
| Undervoltage Protection | Yes |
| TXD Dominant Time-Out | Yes |
| Wake-Up Function | Yes (bus wake from sleep) |
| Low-Power Mode | Yes (standby) |
| ISO 11898 Compliance | Yes |
| RoHS 状态 | Compliant |
SIT1044TK/3 引脚配置
| 引脚 1 | TXD — Transmit Data input from MCU (logic-level, 3.3 V/5 V) |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | VCC — Supply voltage, 4.75 V to 5.25 V |
| 引脚 4 | RXD — Receive Data output to MCU (logic-level) |
| 引脚 5 | NC — Not connected (per datasheet) — leave floating or to GND |
| 引脚 6 | CANL — CAN low-level bus line (differential pair with CANH) |
| 引脚 7 | CANH — CAN high-level bus line (differential pair with CANL) |
| 引脚 8 | STBY — Standby mode control input (low = standby, high = active) |
| 引脚 EP | EP — Exposed thermal pad — must be soldered to GND copper pour for thermal dissipation |
典型应用
SIT1044TK/3 适用于 7 应用s: Automotive Body and Chassis CAN Nodes, Industrial CANopen and Modbus-RTU Networks, Building Automation and HVAC (BACnet, CAN FD), Battery Management System (BMS) Communication, Electric Vehicle Charging Stations (EVSE), Robotics and Drone Telemetry, Medical Device CAN Networks.
Automotive Body and Chassis CAN Nodes
The SIT1044TK/3's ±40 V bus-fault protection, -40 to +125 °C operating range, and 5 Mbps CAN FD capability make it suitable for automotive body and chassis network endpoints such as door modules, seat controllers, mirror adjusters, and lighting ECUs. Placed between the 12 V automotive battery feed (after a local 5 V LDO) and the MCU, it converts the MCU's TXD/RXD logic signals to the ISO 11898 differential CANH/CANL levels on the bus, sustaining jump-start surges and load-dump transients that exceed ±40 V without damage. At 5 Mbps in the CAN FD fast phase, it carries larger multi-GB payload messages used in modern body-controller gateways — a measurable advantage over older 1 Mbps classic CAN transceivers. Pair the SIT1044TK/3 with an STM32F103 or NXP S32K1 MCU and a TLE4275 LDO for a robust automotive CAN node at very low BOM cost (under $1.50 per node including MCU).
推荐
Industrial CANopen and Modbus-RTU Networks
In factory-automation CAN networks — PLCs, drives, sensors, encoders — the SIT1044TK/3 provides 5 Mbps CAN FD data-rate headroom that simplifies time-deterministic control loops on long cable segments. Industrial environments often expose bus wiring to accidental shorts to 24 V or 48 V DC supplies, so the SIT1044TK/3's ±40 V bus-fault tolerance (well above the 24 V rail) preserves uptime when wiring errors happen during installation. The bus wake-up function and 5 µA standby current enable ECUs that can be remotely awakened by bus activity — useful for sleeping sensor nodes in energy-harvested CAN segments. Pair with a TI TMS320F2838x DSC and isolated 5V LDO for high-immunity industrial nodes.
推荐
Building Automation and HVAC (BACnet, CAN FD)
Building-automation networks using BACnet over CAN or CANopen over CAN FD often run cable distances exceeding 100 m, where signal-integrity and EMI margins are tight. The SIT1044TK/3's very low ElectroMagnetic Emission (EME) design — combined with a split-termination network (60 Ω + 60 Ω + 4.7 nF to GND) at the bus end — yields clean bus signals over long cable runs. The 3.3 V/5 V logic interface means the same transceiver connects directly to a low-power HVAC controller MCU without external level translation. At 16,000+ in-stock at LCSC, the SIT1044TK/3 is a strong candidate for high-volume building-automation node production runs.
推荐
Battery Management System (BMS) Communication
In lithium-ion battery packs, a CAN (controller area management) interface often connects each battery module to a master BMS controller. The SIT1044TK/3 supports CAN FD at 5 Mbps for fast telemetry updates of cell voltages, temperatures, and state-of-charge. Its ±40 V bus-fault protection covers accidental shorts to the high-voltage DC bus during pack service — a frequent real-world failure mode in service tools. The 5 µA standby current minimizes quiescent draw when the pack is in storage; bus-wake-up means the BMS can be awakened by the master without an extra wake-up wire. Pair with an STM32L4 ultra-low-power MCU and a low-IQ LDO for an energy-efficient BMS module.
推荐
Electric Vehicle Charging Stations (EVSE)
EV charging stations use CAN FD between the charge controller and the EV for ISO 15118 / DIN 70121 high-level protocol, requiring 5 Mbps sustained data rates. The SIT1044TK/3's 5 Mbps CAN FD performance and ±40 V bus-fault protection handle the high-voltage environment around the charging station's DC bus and the EV's CAN wiring. Its thermal-shutdown and undervoltage-protection features add resilience against the wide temperature and voltage swings an outdoor EVSE experiences. At $0.20/unit it keeps the BOM low in volume-produced chargers. Pair with an ESP32 or STM32H7 host and isolated CAN for EVSE-to-EV communication.
推荐
Robotics and Drone Telemetry
Robotics controllers and drones use CAN FD as a robust differential bus for inter-board communication — motor controllers, ESCs, gimbal controllers, and flight controllers. The SIT1044TK/3's small TDFN-8-EP (3x3 mm) footprint fits the densely-packed ESC and flight-controller PCBs used in modern drones, where board area is precious. The 3.3 V logic interface means the SIT1044TK/3 connects directly to STM32 and Pixhawk-class flight controllers without level shifters. The 5 µA standby current preserves battery life when the drone is disarmed. The exposed thermal pad ensures reliable operation at altitude (lower air density reduces cooling) — pair with a copper pour of at least 10 mm².
推荐
Medical Device CAN Networks
Medical equipment such as infusion pumps, patient monitors, and diagnostic analyzers use CAN FD for inter-module communication in noisy EMI environments (motors, displays, switch-mode supplies). The SIT1044TK/3's very low EME design and 3.3/5 V logic-interface flexibility make it well-suited for these multi-board medical systems. The ±40 V bus-fault protection and thermal shutdown add an extra layer of safety in patient-adjacent equipment. While the SIT1044TK/3 is not IEC 60601-1 qualified as a component, the IC's robust electrical characteristics — combined with system-level isolation (ISO 1050 / ADM3053) — yield a reliable medical CAN FD backbone at very low BOM cost. Pair with a TI MSP430 or STM32L5 host for low-power medical sensing nodes.
推荐
推荐产品汇总
工程参考数据： SIT1044TK/3 ——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 | SIT1044T/3 | LX1044TK/3-03 | TCAN334GDR | TCAN334GDRCT |
|---|---|---|---|---|---|
| Brand | SIT | SIT | LEXUS Semiconductor | Texas Instruments | Texas Instruments |
| Package | TDFN-8-EP (3x3 mm) | SOIC-8 (different footprint, not drop-in PCB swap) | DFN3x3-8 (HVSON8) — same | SOIC-8 (D) / DFN-8 family — variant check required | SOIC-8 — tape/reel variant only |
| Maximum Data Rate | 5 Mbps (CAN FD) | 5 Mbps | 5 Mbps | 5 Mbps | 5 Mbps |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Bus Fault Protection | ±40 V | ±40 V | -40 V to +40 V | ±40 V (per TI datasheet) | ±40 V |
| AEC-Q100 Qualified | Not stated | Not stated | Automotive (per LEXUS datasheet) | Yes | Yes |
关键差异点
- Lowest-cost 5 Mbps CAN FD transceiver in TDFN-8-EP package （对比 TI TCAN334GDR)
- Documented cross-reference from competitor brand （对比 LEXUS LX1044TK/3-03)
- Domestic Chinese manufacturer with large in-stock inventory （对比 TI TCAN334GDR / NXP TJA1042T/3)
设计说明
The TDFN-8-EP exposed thermal pad must be soldered to a GND copper pour of at least 10 mm² on the top and inner PCB layers to keep junction temperature within safe limits during sustained bus-fault events. Estimated: at 5 V VCC and 70 mA dominant current, the IC draws ~0.35 W; combined with bus-fault power during ±40 V surge clamping, junction rise can exceed 60 °C above ambient without adequate copper. Stitching vias (0.3 mm drill, 0.6 mm pad) on a 1 mm grid in the EP pour reduce thermal resistance to roughly 35 °C/W. Without proper EP soldering, the device will enter thermal shutdown prematurely during continuous dominant transmission at elevated ambient temperatures.
Route the CANH and CANL traces as a 100-Ω differential pair with controlled impedance (typically 100 Ω ±10%) over a continuous reference ground plane; keep the pair length-matched within 1 mm and avoid stubs. Place a 100 nF decoupling capacitor within 2 mm of the VCC pin and a 4.7 µF bulk capacitor near the IC. Add a split-termination network (60 Ω + 60 Ω + 4.7 nF to GND) at the bus-end node to suppress common-mode noise and reduce EME. Keep digital logic traces (TXD, RXD, STBY) routed away from the CAN bus pair to minimize crosstalk. Per ISO 11898, place a 120 Ω termination resistor at each end of the bus, not at every node.
Do not connect STBY to GND permanently — this forces the part into sleep mode and prevents transmission. Do not leave TXD floating; if the MCU is unprogrammed or the TXD wire breaks, a stuck-dominant TXD can lock the entire CAN bus. The SIT1044TK/3 includes a TXD dominant time-out (typically 1.2 ms) that auto-releases the bus if TXD is stuck low — but the time-out does NOT override MCU software bugs. Always tie unused NC pins to GND or leave floating per datasheet, do not connect to VCC. Verify the bus-fault protection spec before applying the part to 24 V industrial CANopen networks — ±40 V is sufficient for 24 V automotive/industrial rails but should be confirmed for 48 V battery systems.
合规信息
RoHS and lead-free status per LCSC/JLCPCB listings. AEC-Q100 not stated in verified sources; choose TI TCAN334GDR or NXP TJA1042T/3 for AEC-Q100. ISO 11898 standard compliance confirmed per SIT datasheet V1.5.
