TJA1029T/20/1J - 20 kbaud LIN Transceiver | NXP | Automotive
部品番号: TJA1029T/20/1J ✓ 生産中TJA1029T/20/1J 概要
A LIN transceiver is the physical-layer interface within a Local Interconnect Network. The LIN bus is a low-cost, single-wire automotive network derived from the automotive CAN hierarchy and commonly used for vehicle subnets. It connects sensors, actuators, switches, and electronic control units through a protocol controller, while the transceiver converts controller logic into a properly shaped bus signal and returns received bus data to the controller.
The TJA1029 is optimized for in-vehicle subnetworks operating at baud rates up to 20 kBd. Its LIN bus output is shaped to minimize electromagnetic emissions, and the bus output is pulled high through an internal termination resistor. A TXD dominant-timeout function helps protect the network when the protocol controller fails to release the transmit signal. The device operates from 5 V to 18 V and is specified for an ambient temperature range of -40 °C to 150 °C.
The TJA1029 is pin-compatible with the TJA1020, TJA1021, TJA1022, TJA1027, and MC33662(B) families according to the NXP datasheet. This compatibility supports design reuse when a product requires a different LIN transceiver feature set, although firmware, timing, protection, and application requirements should be reviewed before substitution. The integrated bus interface reduces the component count required for LIN physical-layer connections.
Typical uses include body-control modules, door and seat controllers, climate-control interfaces, sensor gateways, lighting controllers, seat-memory modules, and other low-speed automotive subnetworks. The 20 kBd limit matches conventional LIN communication rates, while the broad 5 V to 18 V supply range supports automotive electrical environments when used with appropriate protection and decoupling.
When laying out the PCB, use the manufacturer pin-definition table and recommended application circuit. Place the device-side and bus-side capacitors close to their intended pins, keep the LIN connection away from sensitive analog and high-speed digital traces, and provide a correctly sized bus termination. The LIN bus requires one master termination and slave-side pull-up arrangements defined by the network design.
This page organizes the TJA1029T/20/1J specifications, protocol support, pin-compatible alternatives, application guidance, and design checks into one engineering reference. It helps distinguish direct family replacements from broader LIN-transceiver choices while keeping package compatibility and automotive operating requirements central to the selection process.
ドロップイン代替品: TJA1029T/20/1J — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: TJA1029T/20/1J （同一形状・フットプリント） — 相違点: Package, Maximum Baud Rate, Operating Temperature Range, Product Type.
TJA1020
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TJA1021T/20/C
✅ ドロップイン価格はお問い合わせください
データシートを見る →TJA1022TK
✅ ドロップイン価格はお問い合わせください
データシートを見る →TJA1027
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MC33662
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TJA1029T/20/1J 仕様
| Product Type | LIN physical-layer transceiver |
| LIN Bus Speed | 20 kBd maximum |
| Supply Voltage Range | 5 V to 18 V |
| 動作温度範囲 | -40 °C to 150 °C |
| LIN Compliance | LIN 2.0, LIN 2.1, LIN 2.2 and LIN 2.2A |
| Automotive Network Compliance | SAE J2602 |
| 12 V LIN Standard | ISO 17987-4:2016 |
| Transceiver Configuration | 1/1 LIN transceiver |
| パッケージ | 8-SOIC, 3.90 mm body width |
| 実装タイプ | Surface mount |
| Shipping Form | Tape and reel |
| Bus Output Termination | Internal pull-up to supply through termination resistor |
| Electromagnetic Emissions | Optimized LIN bus signal shaping |
| Transmit Protection | TXD dominant timeout |
| Power-Supply Reference | 5 V typical automotive transceiver supply |
TJA1029T/20/1J 8-soic, 3.90 mm body width ピン配置ガイド
TJA1029T/20/1J (8-soic, 3.90 mm body width パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: TJA1029T/20/1J.
詳細は データシート をご参照ください。
主な用途
TJA1029T/20/1J の用途: 6 件s: Automotive Body Control Modules, Vehicle Sensor Node Interfaces, Climate Control Module, Door and Seat Control Modules, Automotive Lighting Control, Seat and Comfort System Networks.
Automotive Body Control Modules
The TJA1029T/20/1J fits LIN subnetworks inside body-control modules that connect door, mirror, seat, lighting, and switch assemblies. Its maximum 20 kBd bus rate matches conventional LIN communication, while its 5 V to 18 V supply range supports common automotive low-voltage environments. The device converts controller TXD and RXD signals into the physical LIN bus interface and uses optimized signal shaping to reduce electromagnetic emissions. The NXP datasheet also identifies TXD dominant-timeout protection, which helps limit bus disruption when the controller leaves TXD asserted. PCB implementation should follow the manufacturer application circuit, including close placement of decoupling and controlled routing of the single-wire bus.
Vehicle Sensor Node Interfaces
The TJA1029T/20/1J is suitable for LIN-connected automotive sensors and remote sensor nodes that exchange low-rate data with a central controller. LIN provides a cost-efficient single-wire physical layer for distributed vehicle electronics, and the TJA1029 handles the interface up to 20 kBd. Its 8-pin SOIC package supports compact controller boards, while the -40 °C to 150 °C operating range covers demanding vehicle environments. Use the recommended bus termination and pull-up arrangement from the NXP application diagram. Placement away from high-current switching nodes and sensitive sensor signals helps reduce electromagnetic coupling, while the internally terminated bus output simplifies the standard LIN node implementation.
Climate Control Module
A climate-control module can use the TJA1029T/20/1J for LIN sub-buses linking temperature sensors, fan controllers, flap actuators, and control buttons. The transceiver supports LIN 2.0 through LIN 2.2A, SAE J2602, and ISO 17987-4:2016 for 12 V systems, aligning it with established automotive subnetworks operating at up to 20 kBd. Because the device is a physical-layer interface, the host MCU or LIN controller remains responsible for frame timing, diagnostics, and application data. TXD dominant-timeout protection adds an important safeguard against a stuck transmit command, while optimized output shaping helps contain electromagnetic emissions around motor and relay circuitry.
Door and Seat Control Modules
The TJA1029T/20/1J can interface door-lock, window, seat-memory, and occupant-sensing subsystems that use a low-cost LIN network. A single-wire LIN bus reduces harness complexity compared with multi-wire communication, and the transceiver provides the physical-layer interface needed by a LIN protocol controller. Its 20 kBd maximum rate is suitable for command and status traffic rather than high-bandwidth sensor streaming. The 8-SO package allows reuse of existing automotive controller-board footprints, subject to confirming the exact alternative pin functions. Keep the LIN trace short where practical, route it away from actuator drive currents, and apply the termination scheme specified for the master and slave nodes.
Automotive Lighting Control
The TJA1029T/20/1J is appropriate for LIN-controlled exterior or interior lighting modules where a microcontroller needs reliable communication with a lamp driver or distributed switch. The 5 V to 18 V operating range and -40 °C to 150 °C specification suit automotive electrical conditions, while LIN compliance provides a standardized physical layer for a 20 kBd subnet. The transceiver's optimized bus waveform reduces electromagnetic emissions, which is valuable when the module also contains switching regulators or LED drive stages. TXD dominant-timeout behavior helps prevent the LIN bus from remaining dominant after an unexpected controller fault. Decoupling and bus routing should be planned together to prevent switching-node noise from disturbing reception.
Seat and Comfort System Networks
The TJA1029T/20/1J supports low-bandwidth LIN links in seat, comfort, and convenience systems where motors, switches, and position sensors are distributed throughout the vehicle. Its 20 kBd capability is appropriate for commands, status, diagnostics, and configuration data rather than multimedia traffic. The 8-SOIC package and pin compatibility with several NXP LIN transceivers create a practical path for platform reuse, although sleep behavior, wake-up functions, and fault responses must be checked for each exact alternative. Keep the bus away from motor-current paths, use the prescribed termination, and verify the complete network topology because the master and slave pull-up arrangements determine signal integrity.
エンジニアリング参考データ: TJA1029T/20/1J — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | TJA1020 | TJA1021 | TJA1022 | TJA1027 | MC33662(B) |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Pin Compatibility with TJA1029 | Reference device | Pin-compatible according to NXP datasheet | Pin-compatible according to NXP datasheet | Pin-compatible according to NXP datasheet | Pin-compatible according to NXP datasheet | Pin-compatible according to NXP datasheet |
主な差別化要因
- TXD dominant-timeout fault protection （vs TJA1027)
- Broad protocol support in one automotive LIN transceiver （vs TJA1020)
- Automotive temperature capability （vs MC33662(B))
- Internal bus-output pull-up simplifies the LIN node （vs TJA1021)
設計ノート
Use the NXP TJA1029 recommended application circuit as the PCB-layout baseline. Place the transceiver and local decoupling components near their associated supply and signal pins, keep the LIN route short, and avoid routing it parallel to high-current switching paths. Because LIN is a single-wire bus, the physical trace can act as an antenna; a controlled return path and minimized stub lengths help control electromagnetic emissions and susceptibility.
Do not approve a replacement based only on the shared 8-SO footprint. The NXP datasheet confirms pin compatibility with TJA1020, TJA1021, TJA1022, TJA1027, and MC33662(B), but pin compatibility does not guarantee identical TXD dominant-timeout, sleep, wake-up, receiver-threshold, or protection behavior. Compare the exact alternative datasheet, LIN timing, fault response, and supply behavior before changing the BOM.
The TJA1029 shapes its LIN output to minimize electromagnetic emissions, but layout and network termination remain essential. Keep the bus away from switching-regulator high-current loops, motor drivers, relays, and clock-rich digital circuits. Apply the master termination and slave pull-up arrangement defined for the complete LIN network, and verify the waveform and emissions on the final harness because cable length and branch topology affect system behavior.
The transceiver operates from 5 V to 18 V, but the LIN connector environment can expose the board to automotive transients outside the normal supply range. Use the protection and filtering arrangement in the NXP application guidance, maintain suitable separation between the transceiver supply and raw battery-connected nodes, and validate the complete module against the vehicle's electrical requirements. TXD dominant-timeout addresses one controller fault condition but does not replace input protection.
コンプライアンス情報
The component is an automotive LIN transceiver supporting SAE J2602 and ISO 17987-4:2016. Specific environmental-material declarations and AEC-Q100 qualification status were not stated in the source information.
