TJA1042T/3/1J - High-Speed CAN Transceiver w/ Standby, SOIC-8 | NXP
N.º da peça: TJA1042T/3/1J ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.08 | $1,08 |
| 10 | $0.97 | $9,70 |
| 100 | $0.78 | $78,00 |
| 500 | $0.66 | $330,00 |
| 1.000 | $0.58 | $580,00 |
TJA1042T/3/1J Visão geral
A CAN transceiver (also called a CAN bus transceiver or CAN physical layer device) is a protocol-bridge IC that converts the differential digital signaling on a CAN bus into the single-ended TX/RX logic levels expected by a microcontroller's CAN protocol controller. CAN transceivers sit one layer below the CAN data link layer in the OSI model and are essential for any automotive, industrial, or embedded system that communicates over the Controller Area Network standard (ISO 11898). Without a transceiver the MCU's CAN controller cannot drive or receive the bus.
Key features include excellent electromagnetic compatibility (EMC) and electrostatic discharge (ESD) performance, an SPLIT-pin-free /3 variant with a VIO reference for 3.3 V MCUs, and pin compatibility with the classic TJA1040, PCA82C250, and PCA82C251. The transceiver supports bus wake-up patterns, thermal shutdown, a dominant time-out that prevents bus lockup if the controller fails, and an unpowered bus node that does not disturb the network. The TJA1042T/3/1J also provides a low-current Standby mode in which the bus is continuously monitored for wake-up frames.
Internally the device uses a differential driver with slope control to minimize EMI, very-low-drop receiver comparators, and an integrated VIO reference that allows the logic I/O domain of the chip to match the host MCU's supply. Compared to its predecessor TJA1040, the TJA1042 reduces quiescent current, improves ESD to at least 6 kV HBM, and adds the VIO pin to decouple digital I/O levels from VCC for 3.3 V microcontrollers.
Typical applications include automotive body and chassis ECUs, industrial CANopen and DeviceNet nodes, elevator controllers, building automation gateways, and any CAN node that must interface to a 3.3 V microcontroller without level shifters. The part is widely used as the physical-layer upgrade for designs that previously used TJA1040, PCA82C250, or PCA82C251.
When designing with this part, place a 100 nF decoupling capacitor as close as possible to the VCC pin and a 100 nF cap on VIO; add a common-mode choke and split termination (60 ohm + 5.6 nF at each end) on bus lines operating above 500 kbit/s in noisy environments. Tie the STBY pin high for Normal mode and monitor CANH/CANL for short-to-ground or short-to-VCC conditions. The /3 variant replaces the SPLIT pin of the original TJA1042T with a VIO pin, so confirm that the PCB land pattern matches pin 5 = VIO.
This page synthesizes distributor pricing, drop-in alternatives from the same TJA1042 family and competitor cross-references such as TCAN1042, plus practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para TJA1042T/3/1J — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TJA1042T/3,118
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TJA1042T/1J
✅ Drop-In✓ Em estoque
Consulte o preço
Ver ficha técnica →TJA1051T/3/1J
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TJA1042BT/3,118
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TCAN1042H
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TCAN1044A-Q1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NCV7428D10R2G
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TJA1050T/N,112
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TJA1042T/3/1J Especificações
| Product Type | CAN Transceiver |
| Number of Drivers/Receivers | 1/1 |
| Protocol | CANbus (ISO 11898-2) |
| Maximum Data Rate | 1 Mbit/s |
| Supply Voltage VCC | 4.5 V to 5.5 V |
| Logic I/O Reference VIO | 2.8 V to 5.5 V (for direct 3.3 V MCU interface, /3 variant) |
| Temperatura de operação | -40C to +150C |
| ESD Protection (HBM, on bus pins) | >= 6 kV HBM |
| Standby Mode Current | Very low (per datasheet) |
| Mode Pins | STBY (Standby control) |
| Variant Pin Function (pin 5) | VIO (the /3 variant replaces SPLIT) |
| Bus Wake-up | Yes (via CAN bus in Standby mode) |
| Dominant Time-Out | Yes |
| Desligamento térmico | Yes |
| Encapsulamento | SOIC-8 (SO-8) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Configuração de pinos do TJA1042T/3/1J
| Pino 1 | TXD — Transmit data input from CAN controller (logic-level referenced to VIO) |
| Pino 2 | GND — Ground reference |
| Pino 3 | VCC — 5 V transceiver supply |
| Pino 4 | RXD — Receive data output to CAN controller (referenced to VIO) |
| Pino 5 | VIO — Logic I/O supply reference for MCU interfacing (the /3 variant replaces SPLIT) |
| Pino 6 | CANL — Low-level CAN bus line (differential pair) |
| Pino 7 | CANH — High-level CAN bus line (differential pair) |
| Pino 8 | STBY — Standby mode control input (high = normal, low = standby) |
Aplicações típicas
TJA1042T/3/1J é adequado para 7 aplicaçãos: Automotive Body Control Module, Industrial CANopen Node, Elevator / Lift Controller, Building Automation Gateway, Medical CAN-Based Equipment, Agricultural Machinery CAN Bus, Servo Drive / Motion Control.
Automotive Body Control Module
The TJA1042T/3/1J is widely used in automotive body control modules (BCMs) where it bridges the host MCU to the vehicle's body CAN bus at speeds up to 1 Mbit/s. Its VIO pin allows direct interfacing to a 3.3 V MCU without external level shifters, cutting BOM cost and PCB area. With a standby current draw at the microamp scale and integrated bus wake-up capability, the part supports quiescent-current-sensitive body electronics that must wake from the CAN bus when the ignition is off. The 6 kV HBM ESD rating on bus pins also meets the harsh transient environment under the hood.
Recomendado
Industrial CANopen Node
In industrial CANopen networks, the TJA1042T/3/1J provides the physical layer between a PLC or industrial MCU and the CAN bus running at the typical 125 kbit/s, 250 kbit/s, or 500 kbit/s CANopen data rates. Its low EMC emissions and high EMS immunity allow reliable operation on long bus stubs in factory automation panels. The Standby mode with bus wake-up is useful for energy-saving profiles where nodes sleep between production cycles, while dominant time-out protects against a stuck MCU keeping the bus in dominant state. Differential CANH/CANL driver outputs are rated for the industry's standard 60 ohm bus termination scheme.
Recomendado
Elevator / Lift Controller
Elevator and lift controllers rely on CAN bus for reliable car-to-cabinet communication in noisy motor environments, where the TJA1042T/3/1J's superior EMC performance provides immunity from inverter switching transients. The 1 Mbit/s maximum data rate covers the fast update demands of door-control loops and the slower safety-controller polling. The wide VIO range (2.8 V to 5.5 V) supports both legacy 5 V safety MCUs and newer 3.3 V ARM Cortex controllers without re-spinning the PCB. Unpowered-bus passive behavior is critical when individual car nodes are disconnected for servicing without disturbing network frames.
Recomendado
Building Automation Gateway
Building automation systems using BACnet MS/TP-over-CAN or DeviceNet often employ the TJA1042T/3/1J as the bus transceiver on each HVAC, lighting, or access-control node. The part's -40C to +150C operating range spans unheated equipment closets in cold climates and rooftop enclosures in hot climates. Low standby current lets battery-backed HVAC controllers sleep between scheduled polls while still maintaining wake-up via dedicated CAN frames. The SOIC-8 footprint simplifies hand-prototyping of field-replaceable node modules.
Recomendado
Medical CAN-Based Equipment
Medical imaging systems, patient monitors, and laboratory analyzers increasingly use CAN for internal module-to-module communication, where the TJA1042T/3/1J's high ESD tolerance and EMC robustness protect against electrostatic discharge events common in clinical environments. The deterministic 1 Mbit/s data rate supports synchronized data acquisition across sensor arrays with predictable latency. The transceiver's small SOIC-8 footprint and minimal external BOM suit compact, fanless medical enclosures where PCB real estate is at a premium and reliability is mandatory for IEC 60601-1 compliance on subsystem isolation.
Recomendado
Agricultural Machinery CAN Bus
Modern tractors, harvesters, and implements use CAN J1939 networking where the TJA1042T/3/1J serves as the rugged physical interface for engine, transmission, and ISOBUS communications. The wide -40C to +150C temperature range tolerates under-hood mounting in agricultural equipment that operates through seasons from -30C winters to dusty harvest heat. Differential bus signaling remains reliable in the presence of 48 V starter transients and alternator ripple that ride on the 12 V supply, thanks to the transceiver's high EMS margin. STBY pin enables an energy-saving shutdown during long storage periods on the farm.
Recomendado
Servo Drive / Motion Control
In servo drives and motion controllers, the TJA1042T/3/1J handles CAN bus communication between the main controller and remote digital drives, especially when CANopen DS402 motion profiles are used. Its fast loop times and low loop jitter (sub-microsecond bit timing) support deterministic multi-axis synchronized motion over the bus. The combination of low standby current and bus wake-up is valuable in motion systems that spend long idle periods between motion events. The chip's high immunity to the inverter's common-mode noise lets designers place the CAN cable in the same harness as motor power lines with appropriate filtering.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TJA1042T/3/1J — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TJA1042T/3,118 | TJA1042T/1J | TJA1051T/3/1J | TCAN1042H | NCV7428D10R2G |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | onsemi |
| Pin 5 Function (/3 vs /1) | VIO (3.3 V MCU ref) | VIO (3.3 V MCU ref) | SPLIT (stabilization) | VIO (3.3 V MCU ref) | VIO (3.3 V MCU ref) | VIO equivalent |
| Maximum Data Rate | 1 Mbit/s (classical CAN) | 1 Mbit/s | 1 Mbit/s | 1 Mbit/s | 1 Mbit/s | 5 Mbit/s (CAN FD) |
| VCC Supply Range | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Standby Mode / Bus Wake | Yes (very low I + wake) | Yes | Yes | Yes | Yes | Yes |
| Automotive Grade | AEC-Q100 qualified (TJA1042T family) | AEC-Q100 | AEC-Q100 | AEC-Q100 | Yes (H variants) | AEC-Q100 |
Principais diferenciais
- Integrated VIO reference for 3.3 V MCUs (no level shifter needed) (vs TJA1042T/1J)
- Improved EMC/ESD over legacy TJA1040 (vs TJA1040 (predecessor))
- Cross-brand second source at TI TCAN1042 family (vs TCAN1042H)
- CAN FD support at 5 Mbit/s from competing NCV7428 (vs NCV7428D10R2G)
Notas de projeto
Place a 100 nF ceramic decoupling capacitor as close as possible to the VCC pin (pin 3) and an independent 100 nF on the VIO pin (pin 5) of the TJA1042T/3/1J. The VIO supply should be tied to the host MCU's I/O rail - typically 3.3 V - and any noise on VIO directly modulates the TXD/RXD logic thresholds, so a clean, low-inductance trace is mandatory. For 5 V-only designs that do not require VIO support, the /1 variant with SPLIT on pin 5 is interchangeable in the same footprint.
Do not confuse the TJA1042T/3/1J (pin 5 = VIO) with the TJA1042T/1J (pin 5 = SPLIT) - they are not pin-for-pin equivalent. SPLIT is an analog bus-stabilization output that you would normally bypass to ground through 5.6 nF; tying SPLIT to a 3.3 V logic rail will not work. The /3 variant's VIO pin is a power reference, so leave it floating or tie it to 3.3 V even if your host MCU is 5 V - this is safe but not useful. Always check the variant suffix on the part marking to confirm which pin 5 function is present.
For CAN networks running above 500 kbit/s, use split termination (60 ohm resistor in series with a 5.6 nF capacitor from each CANH/CANL line to ground at both ends of the bus). This reduces common-mode ringing and improves EMC. Keep the stub length from the transceiver to the bus less than 0.3 m, and use twisted-pair cable with 120 ohm characteristic impedance for the trunk. Place a common-mode choke (e.g. 100 uH at 100 MHz) on CANH/CANL between the bus connector and the device when the environment has high RF noise.
Route the CANH and CANL traces as a differential pair with controlled 100 ohm differential impedance, keeping them on the same PCB layer and length-matched within 5 mm. Place a tight ground plane underneath the bus traces for return-current shielding. Avoid routing the bus traces near switching regulator nodes or high-current motor traces - cross at 90 degrees if unavoidable. The SOIC-8 exposed-pad footprint has no thermal pad; nevertheless keep the GND copper pour connected directly to pin 2 for lowest ground-bounce.
Estimated: at the absolute maximum bus load (60 mA short-circuit current), the SOIC-8 thermal resistance is approximately 110 C/W. With VCC = 5 V and a sustained short on CANH to VCC, dissipation could reach 300 mW, yielding a junction rise of ~33 C above ambient, well within the 150 C junction limit. In real CAN bus operation, average dissipation is below 100 mW because the bus drivers switch between dominant and recessive states at low duty cycle. No external heatsink is required in typical conditions.
Informações de conformidade
RoHS and REACH compliant per NXP product page. AEC-Q100 qualified (TJA1042T automotive family). Halogen-free per NXP materials declaration. TJA1042 datasheet is the family-level document covering TJA1042T/3/1J variant.
