TJA1043T - High-Speed CAN Transceiver, 1Mbps, SO-14 | NXP
MPN: TJA1043T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.35 | $235.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
TJA1043T Overview
A CAN transceiver (sometimes called a CAN physical layer or CAN PHY) is the analog interface between a digital CAN protocol controller (typically inside an MCU) and the differential CANH/CANL bus wires that carry data across a vehicle network. It belongs to the broader hierarchy of bus transceivers -> interface ICs -> wired communication ICs. Automotive ECUs (Electronic Control Units) require a certified transceiver that meets ISO 11898 EMC and ESD specifications; the TJA1043 family is a third-generation NXP design widely used in body, chassis, and powertrain CAN nodes.
Key features include 1 Mbps maximum bit rate, ±8 kV HBM ESD on bus pins (per NXP datasheet figures), very low quiescent current in Sleep mode (typically a few microamps), an SPLIT pin for bus biasing when the bus is off, and three operating modes (Normal, Standby, Sleep) selectable via the EN and STBN pins. The IC operates across -40 °C to +125 °C ambient and is qualified to the automotive quality flow.
Internally the TJA1043T uses a bipolar-CMOS-DMOS (BCD) process that combines 5 V analog drive strength on the bus with low-power digital logic. The receiver includes a wide common-mode range for excellent EMC immunity, and the transmitter incorporates slew-rate control to limit EMI on unshielded bus segments.
Typical applications include automotive body control modules, gateway ECUs, chassis controllers, infotainment CAN nodes, and industrial CAN-FD ready nodes that need backward-compatible high-speed CAN. The wide common-mode range also makes it suitable for 12 V and 24 V battery systems in trucks and off-road equipment.
When designing with this part, place a 100 nF decoupling capacitor close to VCC and respect the SPLIT-pin biasing network shown in the datasheet typical application. Verify bus termination (120 Ω at each end) and dominant-timeout behaviour when using a permanently dominant TXD input.
This page synthesizes distributor pricing, drop-in alternative guidance, and practical design notes that complement the manufacturer datasheet and accelerate your component selection.
Drop-in alternatives for TJA1043T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TJA1043T/1J
✅ Drop-In📋 Reference alternative (not in catalog)
TJA1443AT
✅ Drop-In📋 Reference alternative (not in catalog)
TJA1043A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TCAN1043A
✅ Drop-In📋 Reference alternative (not in catalog)
TCAN1043-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
TJA1043T Specifications
| Function | High-speed CAN transceiver |
| Data Rate (max) | 1 Mbps |
| Number of Drivers/Receivers | 1/1 |
| Protocol | ISO 11898-2 / ISO 11898-5 CAN |
| Supply Voltage | 5 V nominal |
| Operating Modes | Normal, Standby, Sleep |
| Operating Temperature | -40 °C to +125 °C |
| Package | 14-pin SO (SOIC-14) |
| Mounting Type | Surface Mount |
| Bus Pins ESD (HBM) | ±8 kV (per NXP datasheet) |
| SPLIT Pin | Yes (for bus bias when bus off) |
| Dominant Timeout | Yes |
| Thermal Shutdown | Yes |
| RoHS Status | Compliant |
| Lead-Free | Yes |
TJA1043T Pin Configuration
| Pin 1 | TXD — Transmit data input from CAN controller (logic-level, pull-up to VCC) |
| Pin 2 | GND — Ground |
| Pin 3 | VCC — 5 V supply voltage |
| Pin 4 | RXD — Receive data output to CAN controller |
| Pin 5 | SPLIT — Bus biasing output (connect via 10 kΩ to CANH and 10 kΩ to CANL per datasheet) |
| Pin 6 | CANL — CAN bus low line (differential) |
| Pin 7 | CANH — CAN bus high line (differential) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | EN — Enable control input (high = Normal mode, low = Sleep mode) |
| Pin 12 | STBN — Standby control input (high = Standby mode) |
| Pin 13 | WAKE — Local wake-up input (edge-triggered) |
| Pin 14 | INH — Inhibit output for external voltage regulator control |
Typical Applications
TJA1043T is suitable for 6 applications: Automotive Body Control Module (BCM), CAN Gateway ECU, Chassis and Powertrain Controller, Industrial CAN Node / PLC, Infotainment CAN Node, 24V Commercial Vehicle / Off-Highway CAN.
Automotive Body Control Module (BCM)
The TJA1043T sits between the BCM microcontroller and the vehicle's high-speed CAN bus, translating the MCU's TXD/RXD logic into the differential CANH/CANL signaling required by ISO 11898-2. Its 1 Mbps Classical CAN capability, -40 °C to +125 °C automotive temperature range, and ±8 kV HBM ESD on the bus pins make it ideal for BCMs controlling lighting, wipers, and door modules. The SPLIT pin stabilizes the recessive bus voltage when the bus is partially shorted, improving EMC during diagnostic sessions. The 5 V supply aligns with typical BCM LDO rails. Companion parts: NXP S32K MCU, TJA1057 (fallback).
Recommended
CAN Gateway ECU
In a vehicle gateway routing CAN traffic between sub-networks (powertrain, body, infotainment), the TJA1043T provides a robust physical-layer interface to each CAN segment. The three operating modes (Normal, Standby, Sleep) allow the gateway to selectively wake only the segments it needs, supporting low quiescent current for parking-mode energy budgets. The SPLIT output biases the bus when no node is dominant, which is critical when a segment is left floating during partial network sleep. Companion parts: NXP S32G gateway processor, TJA1443AT (CAN-FD upgrade).
Recommended
Chassis and Powertrain Controller
Chassis controllers (ABS, ESC, EPS) demand deterministic low-latency CAN communication on the high-speed bus, which the TJA1043T's 1 Mbps ISO 11898-5 compliance supports. The dominant-timeout feature prevents a stuck TXD from blocking the bus indefinitely, a critical safety feature for chassis applications. The thermal-shutdown protection and wide common-mode range (-27 V to +40 V) handle the harsh electrical environment of the chassis harness. Companion parts: TI TCAN1043-Q1 (automotive grade option), NXP FS65 family SBC.
Recommended
Industrial CAN Node / PLC
Beyond automotive, the TJA1043T is suitable for industrial CAN nodes where CANopen or DeviceNet (high-speed CAN physical layer) is used, such as PLCs, motor drives, and sensor hubs. The -40 °C to +125 °C range covers most industrial cabinet environments, and the ±8 kV HBM ESD rating tolerates typical factory floor handling. The 5 V VCC supply aligns with industrial 24 V→5 V LDO rails. Companion parts: STM32F4 MCU, TLE9255V (CAN alternative).
Recommended
Infotainment CAN Node
Infotainment head units and telematics modules use high-speed CAN to communicate with the dashboard cluster and gateway. The TJA1043T's low standby current enables partial-network wake-up so the infotainment node can sleep without loading the bus. The SPLIT pin prevents the recessive bus voltage from drifting during long idle periods, which would otherwise cause false wake-up events. Companion parts: NXP i.MX8 application processor, TJA1042 (low-power variant).
Recommended
24V Commercial Vehicle / Off-Highway CAN
Trucks, buses, agricultural and construction equipment use 24 V battery systems where the bus common-mode range must withstand jump-start and reverse-battery conditions. The TJA1043T's -27 V to +40 V bus-pin tolerance meets these requirements, while the 5 V VCC supply is provided by the on-board ECU regulator. This makes the TJA1043T a common choice for SAE J1939 networks used in heavy-duty vehicles. Companion parts: NXP S32K MCU, TJA1143 (CAN with partial networking).
Recommended
Recommended Products Summary
Engineering reference data for TJA1043T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TJA1043T/1J | TJA1443AT | TJA1043A | TCAN1043A | TCAN1043-Q1 |
|---|---|---|---|---|---|---|
| Package | SO-14 | SO-14 - same | SO-14 - same | SO-14 - same | SO-14 - same | SO-14 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments | Texas Instruments |
| Max Data Rate | 1 Mbps (Classical CAN) | 1 Mbps | 5 Mbps (CAN-FD) | 1 Mbps | 5 Mbps (CAN-FD) | 5 Mbps (CAN-FD) |
| Supply Voltage | 5 V nominal | 5 V | 5 V | 5 V | 5 V | 5 V |
| Operating Modes | Normal / Standby / Sleep | Normal / Standby / Sleep | Normal / Standby / Sleep / Power-off | Normal / Standby / Sleep / Power-off | Normal / Standby / Sleep / Power-off | Normal / Standby / Sleep / Power-off |
| SPLIT Pin | Yes | Yes | Yes | Yes | Yes | Yes |
| Bus ESD (HBM) | ±8 kV | ±8 kV | ±8 kV | ±8 kV | ±8 kV | ±8 kV |
| AEC-Q100 Grade | Automotive flow (qualified on request) | Automotive flow | Automotive flow | Automotive flow | Industrial (non-automotive) | AEC-Q100 qualified |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Key Differentiators
- NXP third-generation CAN design with proven automotive quality (vs TCAN1043A (TI))
- True SO-14 drop-in pin compatibility with TJA1043A and TJA1043T/1J (vs TJA1044 (different family))
- Modern CAN-FD upgrade path via TJA1443AT (vs TCAN1043-Q1 (TI automotive grade))
Design Notes
Place a 100 nF X7R decoupling capacitor as close as possible to the VCC pin (pin 3). Use a wide ground pour under the SO-14 package to reduce thermal impedance, since the chip dissipates up to ~200 mW in dominant-bus conditions. Route CANH and CANL as a tightly-coupled differential pair (100 Ω characteristic impedance, 10-15% coupling) with matched length to within 1 mm to minimize skew.
The TJA1043T's SPLIT pin is not a power output - it requires two external 10 kΩ resistors to CANH and CANL per the datasheet's typical application. Floating SPLIT or tying it directly to the bus without the bias network violates ISO 11898-2 recessive bus voltage requirements and may cause false wake-up events. Do not omit the SPLIT network; it is mandatory for bus stability when the bus is partially shorted.
The EN and STBN pins control the operating mode; verify the timing sequence matches the NXP datasheet before connecting to a digital MCU GPIO. Driving EN low while STBN is high puts the device into Sleep mode (lowest Iq). A bus activity on CANH/CANL or a rising edge on WAKE wakes the device back to Standby. Confirm the host MCU's GPIO is configured as push-pull with adequate drive strength to overcome any on-board pull resistors.
Keep the bus traces away from switching converter and motor drive traces to reduce EMI coupling. If the ECU includes an isolated DC-DC stage, route the CAN bus traces on the opposite side of the PCB and add a guard ground trace between them. The SO-14 footprint has a wide pin-1-to-pin-14 thermal path on the die paddle - thermal shutdown will trigger if total power dissipation exceeds the package rating at high ambient temperatures.
Compliance Information
Per NXP product information, the TJA1043T is qualified to the NXP automotive quality flow designed for body and chassis applications. AEC-Q100 documentation is supplied on request through NXP. RoHS and lead-free are compliant per NXP's product marking.
