TJA1021T/20/C - LIN 2.1 Transceiver, 20kBd, 8-SO | NXP
MPN: TJA1021T/20/C ✓ Hoạt độngTJA1021T/20/C Tóm tắt
What is a LIN transceiver? A LIN transceiver is a physical-layer (PHY) device that translates the low-voltage digital logic signals (TXD/RXD) generated by a microcontroller or LIN controller into the single-wire, dominant/recessive, slew-rate-controlled bus waveform defined by the LIN standard. It handles bus fault protection (short to battery, short to ground, load-dump), ESD protection, thermal shutdown, and wake-up detection via the bus line. The LIN protocol is widely used as a low-cost sub-bus for non-critical automotive body electronics (mirror controls, seat adjusters, door modules, roof consoles), where CAN would be over-spec.
Key features of the TJA1021T/20/C include an integrated slew-rate-controlled LIN bus driver that meets the LIN 2.1/SAE J2602 wave-shaping requirements with minimized electromagnetic emissions (EME), improved ESD robustness compared to the TJA1020, a -27 V to +40 V wide bus load-dump protection range, low-power sleep mode with remote wake-up via the LIN pin, and a dedicated TXD dominant time-out to prevent the bus from being permanently driven.
Architecturally, the TJA1021T/20/C uses a bipolar high-voltage process for the bus-side driver stage combined with low-voltage CMOS logic on the protocol-side (TXD, RXD, EN, WAKE). The integrated pull-up resistor on the bus line and the internal slope-control feedback loop produce the trapezoidal LIN waveform specified by SAE J2602, eliminating the need for an external diode or waveform-shaping RC network. Built-in fail-safe features include loss-of-bat handling, ground-shift tolerance, and under-voltage reset on VCC.
Typical applications include automotive body-control modules, LIN slaves for door/window/seat/steering-column control, HVAC flap motors, mirror adjusters, ambient lighting nodes, and rain/light sensors. Because the part is qualified to the AEC-Q100 automotive reliability standard, it is designed for the harsh electrical environment of a 12 V automotive battery rail, including jump-start and load-dump transients. It also suits industrial LIN sub-buses where the LIN standard provides a simple, robust single-wire alternative to CAN or RS-485.
When designing with this device, ensure the master resistor (typically 660 ohms pull-up to VSUP through a diode) and the bus capacitor (typically 220 pF to 1 nF) are correctly sized, and that the LIN node wake-up strategy (local wake via the WAKE pin vs remote wake via the bus) matches the application requirements.
Bộ thay thế dễ dàng lắp đặt cho TJA1021T/20/C — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TJA1021T/20/C (cùng hình factor và footprint) — khác nhau ở Package, Product Type, Supply Voltage Range, Automotive Qualification, Packaging.
TJA1021BT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TJA1021T/20/C,112
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TJA1021T/10/C
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TJA1021TK/20
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TJA1020T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TLIN1021A-Q1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC33662BEFR2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TJA1021T/20/C Thông số kỹ thuật
| Product Type | LIN Transceiver (single-wire bus PHY) |
| Protocol Supported | LIN 2.0 / 2.1 / 2.2 / 2.2A / SAE J2602 / ISO 17987-4:2016 |
| Maximum Baud Rate | 20 kBd (/20 variant) |
| Minimum Baud Rate | 1 kBd |
| Supply Voltage (VCC) | 3.0 V to 5.5 V (typical 5 V) |
| Bus Voltage Range (VSUP) | 5 V to 27 V (extended -27 V to +40 V with load dump) |
| Number of Transceivers | 1 (half-duplex LIN bus + TXD/RXD logic) |
| Hộp | 8-SO (SOIC-8) SMD |
| Số chân | 8 |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C |
| ESD Protection | HBM exceeds LIN spec (improved vs TJA1020) |
| Load Dump Protection | -27 V to +40 V on LIN bus |
| Kiểu lắp đặt | Surface Mount |
| Pin-to-Pin Compatibility | TJA1020, MC33662(B) |
| Compliance | RoHS |
| Qualification | AEC-Q100 automotive grade |
Cấu hình chân TJA1021T/20/C
| Chân 1 | TXD — Transmit data input from LIN controller (5V CMOS logic) |
| Chân 2 | GND — Logic and bus ground |
| Chân 3 | VSUP — Battery supply (5V to 27V nominal, -27V to +40V transient) |
| Chân 4 | RXD — Receive data output to LIN controller (5V CMOS, push-pull) |
| Chân 5 | EN — Enable input - high for Normal mode, low for Sleep mode |
| Chân 6 | WAKE — Local wake-up input, edge-sensitive |
| Chân 7 | VCC — Logic supply input (3V to 5.5V, typically 5V) |
| Chân 8 | LIN — LIN single-wire bus; integrated slew-rate control and pull-up |
Ứng dụng tiêu biểu
TJA1021T/20/C phù hợp cho 6 Áp dụngs: Automotive Body Control Module LIN Sub-Bus, Door Module with Window Lifter and Mirror Control, HVAC Flap and Blower Motor LIN Node, Roof Console and Ambient Lighting Node, Rain/Light/Temperature Sensor Cluster, Industrial Sensor Sub-Bus over LIN.
Automotive Body Control Module LIN Sub-Bus
Why the TJA1021T/20/C fits body control: it is AEC-Q100 qualified and survives -27 V to +40 V load-dump transients on the 12 V bus. The integrated slew-rate control keeps EME below the OEM limits in dense multi-LIN clusters. Circuit role: each door/seat/mirror slave node places it between the host MCU's UART/TXD/RXD and the single-wire LIN bus, where the TXD dominant time-out prevents a stuck software state from holding the bus dominant. Performance: LIN 2.1/SAE J2602/ISO 17987-4:2016 compliance lets one part cover global automotive platforms without protocol-stack rework.
Được đề xuất
Door Module with Window Lifter and Mirror Control
Why the TJA1021T/20/C fits door modules: with up to 20 kBd it serves both fast window lifter status updates and slower mirror adjustments over one bus. The 8-SO footprint drops directly onto legacy TJA1020 boards, simplifying service replacements. Circuit role: slave node receives local wake events from the LIN bus to power up regulators that drive the H-bridge. Trade-off: a discrete LIN master controller is still required to arbitrate multi-slave round-trips; the transceiver cannot do that alone.
Được đề xuất
HVAC Flap and Blower Motor LIN Node
Why it fits HVAC LIN: AEC-Q100 qualification and -40 C to +125 C operating range handle under-dash thermal swings. Low sleep-mode quiescent current preserves battery during vehicle parking. Circuit role: between the climate control unit's LIN master and the actuator PCB, which usually hosts a small BLDC driver such as an MC33035 or a TI DRV10970. Benefit: 8-SO is small enough to fit inside the actuator housing while still offering the automotive transient protection required by body-electronics OEMs.
Được đề xuất
Roof Console and Ambient Lighting Node
Why this part fits roof console modules: the integrated bus pull-up and LIN waveform shaper reduce BOM count below the headliner by removing an external diode, RC network, or discrete driver transistor. Circuit role: connect between the body controller's body-LIN bus and the local MCU, expanding the system with sunroof, ambient LED, and humidity sensor slaves. Trade-off: a roof console sees long cable runs; the LIN spec allows up to 40 m total bus length, and this transceiver supports it cleanly without adding cable-compensation firmware.
Được đề xuất
Rain/Light/Temperature Sensor Cluster
Why it fits sensor clusters: LIN is the de-facto standard for sensor slave nodes on the windshield and bumper because the bus survives the harsh thermal and EMI environment there. The TJA1021T/20/C's 20 kBd ceiling is more than enough for the periodic-broadcast sensor traffic generated by a rain/light sensor at 100 Hz. Circuit role: the sensor slave MCU broadcasts its ADC readings over the LIN bus to a central ADAS-ECU master. Benefit: the AEC-Q100 qualification lets the supplier avoid re-doing reliability audits for climate-chamber exposure.
Được đề xuất
Industrial Sensor Sub-Bus over LIN
Why it fits industrial LIN: LIN provides a cheaper, simpler physical layer than CAN or RS-485 for short cable runs under 40 m, and the TJA1021T/20/C's automotive-grade ESD helps survive factory-floor transients. Circuit role: industrial PLC digital outputs use the same TJA1021T/20/C to tie distributed digital I/O and sensors into a single-wire LIN trunk. Trade-off: LIN tops out at 20 kBd, so high-speed motion-control loops still need EtherCAT or CAN-FD; reserve this transceiver for slow supervisory loops.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TJA1021T/20/C — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TJA1021BT | TJA1020T | TLIN1021A-Q1 | MC33662BEFR2 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | NXP Semiconductors |
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 (D) - same footprint | SOIC-8 - same |
| LIN Protocol Support | LIN 2.0/2.1/2.2/2.2A/SAE J2602/ISO 17987-4 | LIN 2.x/SAE J2602/ISO 17987 - same | LIN 1.x only (no LIN 2.x optimization) | LIN 2.x/SAE J2602/ISO 17987 - same | LIN 1.x/2.x |
| Maximum Baud Rate | 20 kBd | 20 kBd | 20 kBd | 20 kBd | 20 kBd |
| Load Dump Protection | -27 V to +40 V | -27 V to +40 V (improved) | -27 V to +40 V | -27 V to +40 V | -27 V to +40 V |
| ESD Protection | Improved vs TJA1020 | Enhanced (SOI3+ process) | Baseline | AEC-Q100 qualified | AEC-Q100 qualified |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes (Q1 suffix) | Yes |
| Master/Slave Role | Master or Slave via external resistor | Master or Slave | Master or Slave | Master or Slave | Master or Slave |
Bảo phân biệt quan trọng
- Pin-to-pin compatible with legacy TJA1020 for direct board drop-in (vsTJA1020T)
- Latest SOI3+ process when upgrading to TJA1021BT (vsTJA1021BT)
- Higher baud-rate ceiling than SAE J2602-only /10 variant (vsTJA1021T/10/C)
- Cross-brand second-source via TI TLIN1021A-Q1 (vsTLIN1021A-Q1)
Ghi chú thiết kế
Estimated: VSUP must remain within 5 V to 27 V for normal 12 V automotive operation, and the LIN bus line can see load-dump transients up to +40 V or reversed-battery pulses down to -27 V. Place a reverse-polarity blocking diode (e.g. MBR540 or similar) on VSUP when the application has any risk of reversed battery connection, otherwise the internal clamp will over-dissipate the energy.
Master nodes require an external pull-up of approximately 660 ohms in series with a diode from VSUP to the LIN bus line; slave nodes rely on the internal pull-up. Place the diode as close to the IC as possible to minimize parasitic inductance. The LIN bus trace should be kept short and routed away from noisy switching nodes; the standard bus capacitance is 220 pF to 1 nF, counted across the entire cable plus connectors.
Do not leave TXD floating when the bus is active - a floating TXD can cause the dominant time-out flag to remain asserted. Also remember that the EN pin must be driven high within the LIN wake-up timing window, and that SLEEP mode is reached only after a full inactivity period defined by the host MCU. Note: the TJA1021T/20/C replaced the original TJA1020 with revised ESD and improved slew rate, so verify that any TJA1020 firmware does not assume the older sleep-current values.
Thông tin tuân thủ
AEC-Q100 qualified per NXP product family documentation. RoHS and REACH compliant. Halogen-free per NXP green-package policy.
