L9969-TR - Automotive LIN Transceiver | STMicroelectronics
MPN: L9969-TR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for L9969-TR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
L9969
β Drop-Inβ 99,999 In Stock
$8.1 / Unit
View Datasheet βL9969T
β Drop-Inπ Reference alternative (not in catalog)
TJA1021T
β Drop-Inπ Reference alternative (not in catalog)
MCP2003A
β Drop-Inπ Reference alternative (not in catalog)
L9969-TR Maximum Ratings & Electrical Characteristics
| Protocol | LIN 2.x, SAE J2602 |
| Supply Voltage | 5.5 V to 18 V |
| Data Rate | 20 kbps |
| Quiescent Current (Sleep) | 10 uA |
| Operating Temperature | -40C to +125C |
| Package | SO-8 |
| Mounting Type | Surface Mount |
| AEC-Q100 | Qualified |
| ESD Protection | Β±8 kV (HBM) |
| Load Dump Protection | 40 V |
| Bus Pin Voltage | -27 V to +40 V |
| Dominant State Timeout | Yes |
| Thermal Shutdown | Yes |
| INH Pin | Yes |
| RoHS | Compliant |
L9969-TR Pin Configuration
| Pin 1 | TXD β Transmit data input from MCU |
| Pin 2 | RXD β Receive data output to MCU |
| Pin 3 | INH β Inhibit output for external regulator |
| Pin 4 | GND β Ground |
| Pin 5 | BUS β LIN bus line |
| Pin 6 | VCC β Supply voltage |
| Pin 7 | NC β Not connected |
| Pin 8 | NC β Not connected |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
L9969-TR is suitable for 6 applications: 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.
Recommended
Smart Actuator
The L9969-TR enables smart actuators, such as seat motors and mirror adjusters, to communicate over LIN. Its robust ESD protection (Β±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.
Recommended
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.
Recommended
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.
Recommended
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 (Β±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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for L9969-TR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 | Β±8 kV HBM | Β±8 kV HBM | Β±6 kV HBM | Β±8 kV HBM |
| INH Pin | Yes | Yes | Yes | No |
Key Differentiators
- Lower sleep current than TJA1021T (vs TJA1021T)
- Higher ESD protection than TJA1021T (vs TJA1021T)
- INH pin included, unlike MCP2003A (vs MCP2003A)
Design Notes
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.
Compliance Information
AEC-Q100 qualified per ST product page. RoHS compliant. REACH compliance assumed based on ST policy.
