TJA1044T - 1 Mbit/s CAN Transceiver with Standby | NXP | SO-8
MPN： TJA1044T ✓ 啟用中TJA1044T 概覽
A CAN transceiver, also called a CAN physical-layer interface or CAN PHY, sits between a host microcontroller's CAN controller and the differential CANH/CANL bus wiring. It converts the controller's logic-level TXD signal into a differential dominant/recessive bus waveform and converts the received differential bus state back into a logic-level RXD output. Within the device hierarchy, a CAN transceiver is a bus interface IC, which is a subcategory of interface ICs and, more broadly, of integrated circuits.
The TJA1044 family differentiates itself from earlier generations through an integrated standby (sleep) mode that lets the node hold a defined bus state while drawing minimal supply current, and through transmitter characteristics tuned for automotive EMC robustness. The TJA1044T is specified for 1 Mbit/s operation, which matches classic high-speed CAN traffic used by body controllers, powertrain gateways, comfort systems, and industrial CANopen-style field buses. Variants of the family are additionally specified with loop-delay symmetry parameters, supporting CAN FD fast-phase operation up to 5 Mbit/s on those derivatives.
In the TJA1044T the digital interface runs from a single 5 V supply with a separate VIO pin in packages that provide one, allowing the logic side to be referenced to 3.3 V or 5 V system levels. The standby input pin places the device into a low-power state where the bus driver is de-asserted so the node does not disturb the bus while asleep, which is critical for modules that must wake periodically or remain quiescent during vehicle key-off.
Typical deployments include automotive body and comfort control modules, engine and transmission control units, electric vehicle powertrain controllers, industrial automation gateways, elevator and building automation controllers, and aftermarket CAN diagnostic adapters. Because the transceiver is the physical-layer element closest to the harshest environment in the design, correct bus termination, common-mode margin, and PCB layout matter as much as the controller firmware.
When integrating the TJA1044T, provide the standard 60 ohm termination only at the two physical ends of the bus, keep CANH and CANL routing as a tight, length-matched differential pair away from switching nodes, and confirm that the standby control signal defaults to the correct state at reset so the node never blocks the bus during startup. This page consolidates distributor pricing, drop-in replacement options, and practical integration guidance that are not collated in the manufacturer datasheet itself.
直接替換替代品，適用於 TJA1044T — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TJA1044T （相同外形與佔位） — 差異在於 Package, Product Type, Mounting Type, ESD Protection (Bus Pins, HBM), Maximum Data Rate.
TJA1044T/1Z
✅ 直接替換聯絡詢價
查看資料表 →TJA1044T/3
✅ 直接替換📋 參考替代品（不在目錄中）
TJA1044T/1Z
✅ 直接替換聯絡詢價
查看資料表 →TJA1044DT
✅ 直接替換📋 參考替代品（不在目錄中）
MCP2551-I
✅ 直接替換聯絡詢價
查看資料表 →SN65HVD230DR
✅ 直接替換聯絡詢價
查看資料表 →ATA6560
✅ 直接替換📋 參考替代品（不在目錄中）
TCAN1044A-Q1
✅ 直接替換📋 參考替代品（不在目錄中）
TJA1044T 規格
| Product Type | High-speed CAN transceiver with standby mode |
| Bus / Protocol | CAN (Controller Area Network), 2-wire differential bus |
| Maximum Data Rate | 1 Mbit/s |
| Product Family | Mantis high-speed CAN transceiver family |
| Transceiver Type | 1/1 transceiver (TXD and RXD), half CANbus |
| Standby Control | Dedicated standby (STB) pin |
| 封裝 | 8-pin SO (SOIC-8), surface mount |
| 安裝類型 | Surface Mount |
| Termination | External 60 ohm termination at bus ends (application requirement) |
| Unit Price Reference | $0.2548 as of 2026-10-28 (LCSC listing) |
| Distributor Stock Reference | $0.872 unit price as of 2026-10-28 (ADatasheet listing) |
TJA1044T 8-pin so (soic-8), surface mount 腳位配置指南
TJA1044T（8-pin so (soic-8), surface mount 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： TJA1044T.
請參閱 資料表 以查看完整腳位配置。
典型應用
TJA1044T 適用於 6 應用s: Automotive Body Control Module, Powertrain and EV Control Unit, Industrial CANopen Gateway, Building Automation Controller, Vehicle Diagnostic Interface Adapter, Electric Two-Wheeler and Telemetry Controller.
Automotive Body Control Module
The TJA1044T fits a body control unit that must remain a silent, low-power participant on the vehicle CAN backbone while parked. NXP specifies the device as an automotive CAN transceiver with standby mode at up to 1 Mbit/s, so the module can drop the transceiver into sleep mode during key-off without the driver holding the bus in a dominant state. A typical design powers the transceiver from the module's 5 V rail, drives TXD from the MCU's CAN controller and leaves STB pulled to the inactive state by default. The 8-pin SO surface-mount package keeps the footprint small for the densely packed BCM, and the 1 Mbit/s rating comfortably covers comfort, lighting and central locking traffic. The main design trade-off is that the standby pin must be asserted by firmware or a hardware strap so that reset states never block the bus.
推薦
Powertrain and EV Control Unit
In an engine, transmission or electric-vehicle powertrain controller, the CAN link carries torque, current and thermal data, so a transceiver with strong bus drive and defined recessive behaviour is required. The TJA1044T delivers a 1 Mbit/s high-speed CAN physical layer in an 8-pin SO package, which matches the space-constrained ECU layout, and its standby mode allows the ECU to disconnect from the bus during software update or crash logging. Because the Mantis family is characterised for automotive EMC robustness, the design can pass transient and ESD requirements with standard external protection. The standby function also means the node does not need a discrete relay or bus switch to become invisible on the network.
推薦
Industrial CANopen Gateway
A CANopen gateway bridging a factory automation line to Ethernet uses the TJA1044T as the field-bus physical layer. The 1 Mbit/s data rate matches the classic CANopen profile used on machine-tool and robotics networks, while the low sleep-mode current consumption suits gateways that power down the field side while the Ethernet side stays alive. A design would feed the transceiver from a 5 V isolated or non-isolated rail, protect CANH and CANL with a TVS array and optional galvanic isolation, and fit split-capacitor termination for EMC. The standby pin gives the gateway a clean way to release the bus when it becomes a network server rather than a bus master.
推薦
Building Automation Controller
HVAC, lift and access-control controllers in building automation networks frequently share a single twisted-pair CAN backbone. The TJA1044T provides the differential bus driver and receiver needed to place such a controller on that backbone, with a compact SO-8 footprint that suits wall-mounted panels with limited board area. Its standby mode allows a controller that is off-line or in a maintenance state to become transparent to the bus instead of holding it dominant, which prevents the entire floor from losing communication. With 1 Mbit/s capability the transceiver supports controller-to-controller traffic in addition to sensor polling, and the low sleep current reduces standby power in installed equipment.
推薦
Vehicle Diagnostic Interface Adapter
A compact OBD-II style adapter that connects a host PC to the vehicle's diagnostic CAN bus uses the TJA1044T to bridge the physical layer to a CAN controller over SPI or UART. The standby mode lets the adapter keep the bus electrically silent when the PC application is not actively running a diagnostic session, preventing the dongle from interfering with normal vehicle traffic. The 1 Mbit/s rate is well above what diagnostic messaging requires, so the link is not the limiting factor for flashing and logging operations. The 8-pin SO package keeps the adapter small enough for a OBD connector shell, and external termination can be added for stub-heavy diagnostic buses.
推薦
Electric Two-Wheeler and Telemetry Controller
Battery-powered e-bike controllers and fleet telemetry units use a CAN link between the motor controller and the display or battery management system, and every milliamp of standby current matters because the pack capacity is limited. The TJA1044T's low current consumption in sleep mode allows the telemetry node to hold the bus in standby between reporting intervals rather than powering the whole board down, while the standby pin prevents the sleeping node from clamping the bus. The 1 Mbit/s rating supports dense controller traffic, and the SO-8 package leaves room in a sealed, potted enclosure. A design should confirm the exact sleep current in the datasheet and pair it with the low-power MCU's own shutdown behaviour.
推薦
推薦產品摘要
工程參考資料，適用於 TJA1044T — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TJA1044T/1 | TJA1044T/3 | TJA1044T/1Z | TJA1044DT | MCP2551 | SN65HVD230 | ATA6560 | TCAN1044A-Q1 |
|---|---|---|---|---|---|---|---|---|---|
| Package | SOIC-8 (8-SO) | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same | SOIC-8 (8-SO) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | Microchip Technology | Texas Instruments | Microchip Technology | Texas Instruments |
| Product Type | High-speed CAN transceiver with standby mode | High-speed CAN transceiver with standby mode | High-speed CAN transceiver with standby mode | High-speed CAN transceiver with standby mode | High-speed CAN transceiver with standby mode | High-speed CAN transceiver | CAN transceiver with sleep mode | Low-power CAN transceiver | Automotive CAN transceiver |
| Maximum Data Rate | 1 Mbit/s | 1 Mbit/s | 1 Mbit/s (loop-delay symmetry specified) | 1 Mbit/s | 1 Mbit/s base, CAN FD fast phase up to 5 Mbit/s on specified variants | 1 Mbit/s class high-speed CAN | 1 Mbit/s | 1 Mbit/s class high-speed CAN | 1 Mbit/s |
| Standby / Sleep Function | Yes - dedicated standby (STB) pin with low sleep-mode current | Yes - identical | Yes - identical | Yes - identical | Yes - identical | Yes - STB standby input | Yes - sleep mode with wake-up | Yes - STB standby, low-power focused | Yes - STB standby, no SPLIT pin (leave NC) |
| Bus Family / Manufacturer Notes | NXP Mantis family high-speed CAN transceiver | NXP Mantis family | NXP Mantis family | NXP Mantis family | NXP Mantis family | Microchip high-speed CAN family | TI HVD CAN family | Microchip ATA65xx low-power CAN family | TI TCAN family |
主要差異化特點
- Integrated standby mode with low sleep current in an 8-pin SO footprint (對比ATA6560)
- Single-source family with multiple orderable suffixes on one footprint (對比SN65HVD230)
- Automotive EMC-oriented CAN physical layer with STB standby input (對比MCP2551)
- Bus-transparent low-power state for key-off and sleep designs (對比TCAN1044A-Q1)
設計說明
Route CANH and CANL as a tightly coupled differential pair over a continuous ground plane, keeping the pair length matched and away from switching nodes, inductors and crystal circuits. Place the transceiver close to the bus connector so the unprotected stub from the IC to the connector is as short as possible, and provide a solid ground return directly under the device. Differential impedance around 60 ohm to 120 ohm differential is typical for CAN; confirm with your fab's stack-up and the transceiver's own guidance in the NXP datasheet.
Terminate the bus with exactly two 120 ohm resistors, one at each physical end of the network, giving 60 ohm between CANH and CANL when measured with the bus powered down. Never terminate every node, as parallel termination collapses the differential impedance and reduces noise margin. For EMC-sensitive automotive or industrial environments, use split termination with a 4.7 nF to 100 nF capacitor to ground at each end, and add a common-mode choke or TVS array on the connector side.
The standby (STB) input determines whether the node participates on the bus, so tie it to a defined state at reset. Leaving STB floating or asserting it incorrectly during startup can make the transceiver hold the bus dominant and block traffic for every other node. Confirm in the datasheet whether the pin is active-high or active-low for your suffix and set the MCU pull accordingly; if firmware controls standby, add a pull resistor that defaults to the safe bus-transparent state.
Decouple VCC locally with a 100 nF ceramic plus a bulk 1 uF to 10 uF capacitor placed within a few millimetres of the supply pins, and use a separate VIO decoupling capacitor if the split logic supply is used. Because the transceiver can source and sink significant current when driving a dominant bus state, ensure the 5 V rail has headroom for the inrush at bus start-up and that the MCU and transceiver share a common ground return without long shared traces.
Do not assume the TJA1044T covers CAN FD fast phase. The base part is specified for 1 Mbit/s; NXP's family notes state that additional variants with defined loop-delay symmetry parameters support the CAN FD fast phase up to 5 Mbit/s. If the design needs CAN FD data rates, select the specific orderable variant (for example the TJA1044DT family) and re-verify bus timing, and never mix 1 Mbit/s-only and CAN FD transceivers on the same bus segment.
合規資訊
The supplied verified web data confirms the automotive CAN transceiver application and 1 Mbit/s / standby-mode features but does not contain explicit RoHS, REACH or AEC-Q100 statements; these are therefore marked unknown rather than assumed. Check the NXP TJA1044 datasheet and the NXP product page for the definitive declarations for the specific ordering suffix.
