TJA1021T/20/C - LIN 2.1 Transceiver, 20kBd, 8-SO | NXP
Артикул: TJA1021T/20/C ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $1.08 | $1,08 |
| 10 | $0.95 | $9,50 |
| 100 | $0.78 | $78,00 |
| 500 | $0.62 | $310,00 |
| 1.000 | $0.52 | $520,00 |
| 2.500 | $0.45 | $1.125,00 |
TJA1021T/20/C Обзор
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.
Аналоги без доработки для TJA1021T/20/C — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
TJA1021BT
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TJA1021T/20/C,112
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TJA1021T/10/C
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TJA1021TK/20
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
TJA1020T
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TLIN1021A-Q1
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MC33662BEFR2
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
TJA1021T/20/C Характеристики
| 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) |
| Корпус | 8-SO (SOIC-8) SMD |
| Число выводов | 8 |
| Диапазон рабочих температур | -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 |
| Тип монтажа | Surface Mount |
| Pin-to-Pin Compatibility | TJA1020, MC33662(B) |
| Compliance | RoHS |
| Qualification | AEC-Q100 automotive grade |
Конфигурация выводов TJA1021T/20/C
| Контакт 1 | TXD — Transmit data input from LIN controller (5V CMOS logic) |
| Контакт 2 | GND — Logic and bus ground |
| Контакт 3 | VSUP — Battery supply (5V to 27V nominal, -27V to +40V transient) |
| Контакт 4 | RXD — Receive data output to LIN controller (5V CMOS, push-pull) |
| Контакт 5 | EN — Enable input - high for Normal mode, low for Sleep mode |
| Контакт 6 | WAKE — Local wake-up input, edge-sensitive |
| Контакт 7 | VCC — Logic supply input (3V to 5.5V, typically 5V) |
| Контакт 8 | LIN — LIN single-wire bus; integrated slew-rate control and pull-up |
Типичное применение
TJA1021T/20/C подходит для 6 применениеs: 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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для TJA1021T/20/C — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | 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 |
Ключевые отличия
- Pin-to-pin compatible with legacy TJA1020 for direct board drop-in (против TJA1020T)
- Latest SOI3+ process when upgrading to TJA1021BT (против TJA1021BT)
- Higher baud-rate ceiling than SAE J2602-only /10 variant (против TJA1021T/10/C)
- Cross-brand second-source via TI TLIN1021A-Q1 (против TLIN1021A-Q1)
Заметки по проектированию
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.
Информация о соответствии
AEC-Q100 qualified per NXP product family documentation. RoHS and REACH compliant. Halogen-free per NXP green-package policy.
