L9969-TR - Automotive LIN Transceiver | STMicroelectronics
料号： L9969-TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.87 | $435.00 |
| 1,000 | $0.79 | $790.00 |
L9969-TR 概述
A LIN transceiver is a physical layer device that connects a microcontroller's UART to a single-wire bus, enabling communication at data rates up to 20 kbps. It converts the microcontroller's logic-level signals to the bus voltage levels (typically 12V) and provides protection against short circuits, overvoltage, and ESD. In the automotive network hierarchy, the LIN transceiver sits between the LIN protocol controller (often integrated in the MCU) and the physical bus, forming the lowest-cost networking layer below CAN and FlexRay. It is essential for body control modules, smart actuators, and sensor nodes.
Key features of the L9969-TR include a wide operating voltage range of 5.5V to 18V (with 40V load dump protection), a low quiescent current of 10 uA in sleep mode, and a data rate of up to 20 kbps. It supports both 3.3V and 5V microcontroller interfaces, and includes a dominant state timeout and thermal shutdown protection. The device is AEC-Q100 qualified, ensuring reliability in harsh automotive environments.
The L9969-TR uses a robust BiCMOS process technology, integrating a high-voltage bus driver, a receiver with slew-rate control, and protection circuitry. Its architecture ensures low electromagnetic emission (EME) and high electromagnetic immunity (EMI), meeting stringent automotive EMC requirements. The device also features a dedicated INH (inhibit) pin for controlling an external voltage regulator, enabling efficient power management in sleep mode.
Typical applications include body control modules, door modules, seat control, steering column switches, and smart actuators. The L9969-TR is also used in LIN-based sensor nodes for climate control and lighting systems. Its low quiescent current makes it ideal for battery-powered modules that must remain in sleep mode for extended periods.
When designing with the L9969-TR, ensure proper bus termination (typically 1 kOhm to 5V) and place a 220 pF capacitor on the bus line for EMC filtering. The INH pin should be connected to the enable input of the voltage regulator to achieve low standby power consumption. For thermal management, the SO-8 package has a thermal resistance of 150 C/W, so adequate PCB copper area is recommended for high-temperature environments.
直接替换替代料： L9969-TR ——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： L9969-TR （相同外形与封装尺寸） ——差异在于 Package.
快速对比工具——选择替代料号进行并排对比：
L9969
✅ 直接替换✓ 有现货
$3.1 / 个
查看数据手册 →L9969T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TJA1021T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MCP2003A
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
L9969-TR 规格参数
| Protocol | LIN 2.x, SAE J2602 |
| 电源电压 | 5.5 V to 18 V |
| 数据速率 | 20 kbps |
| Quiescent Current (Sleep) | 10 uA |
| 工作温度 | -40C to +125C |
| 封装 | SO-8 |
| 安装类型 | Surface Mount |
| AEC-Q100 | Qualified |
| ESD Protection | ±8 kV (HBM) |
| Load Dump Protection | 40 V |
| Bus Pin Voltage | -27 V to +40 V |
| Dominant State Timeout | Yes |
| 热关断 | Yes |
| INH Pin | Yes |
| RoHS | Compliant |
L9969-TR 引脚配置
| 引脚 1 | TXD — Transmit data input from MCU |
| 引脚 2 | RXD — Receive data output to MCU |
| 引脚 3 | INH — Inhibit output for external regulator |
| 引脚 4 | GND — Ground |
| 引脚 5 | BUS — LIN bus line |
| 引脚 6 | VCC — Supply voltage |
| 引脚 7 | NC — Not connected |
| 引脚 8 | NC — Not connected |
典型应用
L9969-TR 适用于 6 应用s: Body Control Module, Smart Actuator, Climate Control Sensor Node, Lighting Control Module, Steering Column Switch, Door Module.
Body Control Module
The L9969-TR is used in body control modules (BCMs) to provide LIN communication for door locks, window lifts, and lighting control. Its low quiescent current (10 uA) ensures minimal battery drain when the vehicle is off, and its AEC-Q100 qualification guarantees reliability in the harsh automotive environment. The wide supply range (5.5V to 18V) accommodates battery voltage variations during cranking and load dump. In a typical BCM, the L9969-TR connects the MCU's UART to the LIN bus, with a 1 kOhm termination resistor and a 220 pF capacitor for EMC filtering. The INH pin controls the voltage regulator, enabling the module to enter a low-power sleep mode when the bus is idle. This design reduces standby current to below 100 uA, extending battery life. Compared to CAN, LIN offers lower cost and simpler wiring, making it ideal for non-critical body functions.
推荐
Smart Actuator
The L9969-TR enables smart actuators, such as seat motors and mirror adjusters, to communicate over LIN. Its robust ESD protection (±8 kV HBM) and thermal shutdown ensure reliable operation in mechanically demanding environments. The device's dominant state timeout prevents bus lockup if the MCU fails, enhancing system safety. In a smart actuator, the L9969-TR receives commands from the BCM via LIN and drives the actuator motor through a bridge driver. The transceiver's low sleep current allows the actuator to remain in standby until a command is received, reducing power consumption. The SO-8 package fits compact actuator housings, and the wide temperature range (-40C to +125C) supports under-hood and door-mounted applications. The INH pin can be used to power down the motor driver during sleep, further reducing quiescent current.
推荐
Climate Control Sensor Node
The L9969-TR is used in climate control sensor nodes to transmit temperature and humidity data over LIN. Its low quiescent current (10 uA) is critical for battery-powered nodes that must operate for years without maintenance. The device's high EMC immunity ensures reliable communication in the electrically noisy environment of a vehicle's HVAC system. In a typical sensor node, the L9969-TR interfaces with a sensor (e.g., temperature sensor) and an MCU, sending data to the climate control unit. The transceiver's slew-rate control minimizes electromagnetic emission, preventing interference with other vehicle electronics. The wide supply range allows direct connection to the vehicle battery, and the thermal shutdown protects the device in case of a fault. The SO-8 package is ideal for small sensor modules placed in ducts or behind the dashboard.
推荐
Lighting Control Module
The L9969-TR is employed in lighting control modules for headlamps, taillights, and interior lighting. Its ability to operate from 5.5V to 18V makes it compatible with both 12V and 24V vehicle electrical systems. The device's low sleep current helps meet stringent standby power regulations for automotive lighting. In a lighting module, the L9969-TR receives LIN commands to turn lights on/off or adjust brightness, and controls LED drivers or relays accordingly. The transceiver's robust protection features, including load dump protection up to 40V, safeguard the module against voltage transients. The INH pin can be used to disable the LED driver during sleep, reducing dark current. The AEC-Q100 qualification ensures long-term reliability in the high-temperature environment near headlamps.
推荐
Steering Column Switch
The L9969-TR is used in steering column switches to transmit wiper, turn signal, and cruise control commands over LIN. Its compact SO-8 package fits the limited space inside the steering column, and its wide temperature range (-40C to +125C) ensures operation in extreme conditions. The device's ESD protection (±8 kV HBM) is essential for switches that are frequently touched by the driver. In a steering column switch module, the L9969-TR connects the switch matrix to the LIN bus, sending commands to the BCM. The transceiver's low quiescent current allows the module to remain in sleep mode when not in use, reducing battery drain. The dominant state timeout prevents bus errors if a switch is stuck, enhancing system reliability. The INH pin can be used to power down the switch matrix during sleep.
推荐
Door Module
The L9969-TR is a key component in door modules, providing LIN communication for window lifts, mirror adjustment, and door lock actuators. Its low quiescent current (10 uA) is crucial for minimizing battery drain when the vehicle is parked. The device's robust protection features, including thermal shutdown and load dump protection, ensure reliable operation in the harsh environment of a car door. In a door module, the L9969-TR interfaces with the MCU and the LIN bus, enabling communication with the BCM. The transceiver's slew-rate control reduces electromagnetic emission, preventing interference with other vehicle systems. The wide supply range (5.5V to 18V) accommodates voltage fluctuations during window motor operation. The SO-8 package is ideal for the compact PCB inside the door panel.
推荐
推荐产品汇总
工程参考数据： L9969-TR ——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 | L9969 | TJA1021T | MCP2003A |
|---|---|---|---|---|
| Package | SO-8 | SO-8 | SO-8 | SO-8 |
| Brand | STMicroelectronics | STMicroelectronics | NXP Semiconductors | Microchip Technology |
| Supply Voltage | 5.5V to 18V | 5.5V to 18V | 5.5V to 18V | 6V to 18V |
| Quiescent Current (Sleep) | 10 uA | 10 uA | 15 uA | 5 uA |
| Data Rate | 20 kbps | 20 kbps | 20 kbps | 20 kbps |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
| ESD Protection | ±8 kV HBM | ±8 kV HBM | ±6 kV HBM | ±8 kV HBM |
| INH Pin | Yes | Yes | Yes | No |
关键差异点
- Lower sleep current than TJA1021T （对比 TJA1021T)
- Higher ESD protection than TJA1021T （对比 TJA1021T)
- INH pin included, unlike MCP2003A （对比 MCP2003A)
设计说明
Place a 220 pF capacitor on the BUS pin to ground for EMC filtering, and a 1 kOhm termination resistor from BUS to VCC (or 5V) as per LIN specification. Keep the trace from the transceiver to the bus connector as short as possible to minimize parasitic inductance.
The INH pin should be connected to the enable input of the external voltage regulator to achieve low standby power. When the bus is idle, the transceiver enters sleep mode and pulls INH low, disabling the regulator. This reduces the module's quiescent current to below 100 uA.
The SO-8 package has a thermal resistance of approximately 150 C/W. In high-temperature environments (e.g., under-hood), ensure adequate PCB copper area for heat dissipation. The device's thermal shutdown protects against overtemperature, but proper layout can prevent triggering it.
合规信息
AEC-Q100 qualified per ST product page. RoHS compliant. REACH compliance assumed based on ST policy.
