TLIN821-Q1 - Automotive Fault-Protected LIN Transceiver | Texas Instruments
MPN: TLIN821-Q1 ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TLIN821-Q1 Overview
A LIN transceiver is a physical layer device that interfaces a microcontroller's UART to the single-wire LIN bus. It converts the TXD signal from the MCU into a bus signal and senses the bus state to drive the open-drain RXD output. The TLIN821-Q1 includes a current-limited wave-shaping driver that reduces electromagnetic emissions (EME), helping meet automotive EMC requirements.“
Key features include integrated ESD protection, under-voltage protection, thermal shutdown, and ground fault protection. The device also offers inhibit and wake functions, allowing the LIN node to enter low-power mode and be woken by bus activity or a dedicated wake signal. This reduces current consumption in parked vehicles.
The TLIN821-Q1 is AEC-Q100 qualified, ensuring reliable operation across the automotive temperature range. Its robust fault protection prevents damage from accidental shorts, ground drifts, or supply disconnections. According to the TI datasheet, when a fault occurs, the transmitter is disabled until the fault is removed.
Typical applications include automotive body control modules, door and seat control units, lighting systems, HVAC actuators, and battery management systems. With its 20 kbps data rate and fault-tolerant design, it is the ideal choice for LIN-based automotive networking.
Drop-in alternatives for TLIN821-Q1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLIN1021A-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TLIN2021A-Q1
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLIN1022A-Q1
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLIN2022A-Q1
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLIN821-Q1 Specifications
| Function | Local Interconnect Network (LIN) physical layer transceiver |
| Data Rate | up to 20 kbps |
| Package | SON (DRB) 8-pin |
| Mounting Type | Surface Mount |
| RXD Output | Open-drain |
| ESD Protection | Integrated |
| Fault Protection | Under-voltage, thermal shutdown, ground fault |
| EME Reduction | Current-limited wave-shaping driver |
| Inhibit Function | Yes |
| Wake Function | Yes |
| Automotive Grade | AEC-Q100 qualified (Q1) |
| Number of Pins | 8 |
TLIN821-Q1 son (drb) 8-pin Pin Configuration Guide
Pin configuration for TLIN821-Q1 (son (drb) 8-pin package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TLIN821-Q1.
Refer to the datasheet for full pin configuration.
Typical Applications
TLIN821-Q1 is suitable for 6 applications: Automotive Door Module, Seat Control Module, Wiper Control System, Automotive Lighting, HVAC Systems, Battery Management System.
Automotive Door Module
In automotive door modules, the TLIN821-Q1 serves as the physical layer for LIN communication between the door switch panel and the central body control unit. Its data rate of up to 20 kbps and automotive-grade fault protection (under-voltage, thermal shutdown, ground fault) ensure reliable operation in harsh vehicle environments. The current-limited wave-shaping driver reduces electromagnetic emissions, meeting EMC requirements. When paired with an MCU like TMS320F28035-Q1, the TLIN821-Q1 provides the robust LIN interface needed for door lock, window, and mirror control functions.
Recommended
Seat Control Module
The TLIN821-Q1 is used in seat control modules to communicate seat position, memory, and heating commands over a LIN bus. Its inhibit and wake functions allow the seat module to remain in low-power mode until commanded, reducing battery drain in parked vehicles. The transceiver's fault protection and ESD robustness protect the LIN bus from shorts and transients. With a 20 kbps data rate, it handles the low-speed control signals typical of seat actuators and sensors.
Recommended
Wiper Control System
In wiper control systems, the TLIN821-Q1 enables LIN connectivity between the wiper switch, motor driver, and body controller. Its open-drain RXD output directly reports bus state to the MCU, simplifying interface design. The device's under-voltage and thermal shutdown protection ensures safe operation during stalled motor conditions. The 20 kbps data rate is adequate for wiper speed and intermittent control commands.
Recommended
Automotive Lighting
The TLIN821-Q1 is well-suited for automotive lighting modules, including daytime running lights and rear light assemblies, where LIN is used for light control and diagnostic reporting. Its integrated ESD and fault protection reduce the need for external protection components, saving board space. The wave-shaped driver minimizes EMI interference with sensitive lighting electronics. The device's inhibit pin enables low-power standby in ignition-off states.
Recommended
HVAC Systems
In HVAC systems, the TLIN821-Q1 communicates with air vents, flap actuators, and fan controls over a LIN bus. Its 20 kbps LIN interface and fault protection ensure reliable data transfer in high-temperature, high-vibration environments. The device's open-drain RXD output allows easy detection of bus contention and wake-up events. With its compact SON (DRB) package, it fits into slim control pod designs.
Recommended
Battery Management System
The TLIN821-Q1 can be used in battery management systems for LIN communication between the battery cell monitoring chips and the BMS controller. Its small package and integrated ESD protection make it ideal for space-constrained BMS boards. The transceiver's robust fault handling prevents communication loss during battery pack faults. The wake feature allows the BMS to remain dormant until woken by the LIN bus.
Recommended
Recommended Products Summary
Engineering reference data for TLIN821-Q1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLIN1021A-Q1 | TLIN2021A-Q1 | TLIN1022A-Q1 |
|---|---|---|---|---|
| Package | SON (DRB) | SON (DRB) | SON (DRB) | SON (DRB) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Data Rate | 20 kbps | 20 kbps | 20 kbps | 20 kbps |
| Automotive Grade | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
| RXD Output | Open-drain | Open-drain | Open-drain | Open-drain |
Key Differentiators
- Fault protection with ground drift isolation (vs TLIN1021A-Q1)
- Integrated inhibit and wake functions (vs TLIN1021A-Q1)
- Automotive qualification (AEC-Q100) (vs Standard LIN transceivers)
Design Notes
For the TLIN821-Q1, place a 0.1 uF decoupling capacitor close to the VSUP pin to filter high-frequency noise. Use a solid ground plane under the device to ensure low-impedance return paths. Keep the LIN bus traces away from sensitive analog signals to avoid crosstalk.
The TLIN821-Q1 has thermal shutdown protection. Ensure adequate copper area around the exposed pad (if present) for heat dissipation. In normal LIN operation, power dissipation is low, but in fault conditions (e.g., LIN bus short) the device may heat up; ensure sufficient thermal relief.
When designing the LIN bus, ensure proper termination (usually a 1 kOhm resistor to VSUP on the master side). Do not connect a master termination on slave nodes. Also, avoid exceeding the absolute maximum voltage on the LIN pin; the device has fault protection but external transient suppression is still recommended for automotive environments.
Compliance Information
Automotive-grade via AEC-Q100 (Q1 suffix). Other compliance data not provided in verified sources.
