Automotive PCB Calculator
ADAS | Electric Vehicles | Infotainment | Powertrain
Calculate trace width and impedance for automotive electronics. From 77 GHz radar to CAN bus networks, get the right PCB design parameters for reliable vehicle applications meeting ISO 26262 and AEC-Q requirements.
Common Automotive Applications
| Application | Material | Impedance | Standard |
|---|---|---|---|
| ADAS Radar (77 GHz) | Rogers RO3003 | 50Ω SE / 100Ω Diff | ISO 26262 |
| CAN Bus | High-Tg FR4 | 120Ω Diff | ISO 11898 |
| Ethernet (100BASE-T1) | FR4 / High-Tg | 100Ω Diff | IEEE 802.3bw |
| EV BMS | High-Tg FR4 | Various | ISO 26262 |
Automotive PCB Requirements
Temperature Range
Automotive PCBs must operate from -40°C to +125°C (or +150°C for under-hood). Use High-Tg FR4 (Tg >170°C) and automotive-grade components (AEC-Q100/Q200).
EMC Compliance
Strict EMC requirements (CISPR 25). Proper impedance control, good grounding, and shielding are critical. Calculate trace impedances accurately to minimize EMI.
Functional Safety
ISO 26262 compliance for safety-critical systems. Proper current-carrying capacity, redundancy, and reliable trace design are essential for ASIL ratings.
Key Automotive Design Areas
ADAS & Radar (77 GHz)
- • Rogers RO3003 or similar low-loss material
- • Extremely tight impedance control (±5%)
- • Microstrip antenna design
- • Thermal management critical
- • Consider hybrid stackups
EV Power Electronics
- • Heavy copper (2-4 oz) for high currents
- • Thermal via arrays for heat dissipation
- • Wide traces for power paths
- • Proper creepage/clearance for HV
- • High-Tg materials for thermal stability
In-Vehicle Networking
- • CAN: 120Ω differential impedance
- • Automotive Ethernet: 100Ω differential
- • FlexRay: 80-110Ω range
- • Proper termination essential
- • EMC filtering at connectors
Infotainment
- • HDMI: 100Ω differential
- • USB: 90Ω differential
- • High-speed DDR memory
- • Audio design considerations
- • Display interface routing
Complete Automotive Electronics Integration
Beyond PCB design, automotive electronics require professional cable harness and wiring solutions to ensure reliable connectivity across the entire vehicle system.
Automotive Wire Harness Assembly
Professional cable harness manufacturing for ADAS, EV power systems, and vehicle networking. Custom solutions for automotive-grade reliability requirements.
Robotics Cable Solutions
Specialized cable assemblies for automotive manufacturing robots, AGVs, and automated production line systems in modern vehicle factories.
Calculate Automotive Trace Dimensions
Use our free calculators for automotive PCB design. Determine trace widths for high current, impedances for CAN/Ethernet, and via arrays for thermal management.
Automotive PCB FAQ
What material for automotive PCBs?
High-Tg FR4 (Tg≥170°C) for most applications. Rogers or similar for 77 GHz radar. Consider halogen-free for environmental compliance.
What's AEC-Q qualification?
AEC-Q100 (ICs), AEC-Q200 (passives) are automotive reliability standards. Use qualified components for production automotive designs.
CAN bus impedance requirements?
CAN uses 120Ω differential impedance. Terminate with 120Ω resistors at both ends of the bus. Match traces to this impedance.
How to handle EV high voltage?
Maintain proper creepage/clearance per IEC 60664. Use reinforced insulation, consider conformal coating, and calculate trace widths for high currents.
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