Enter the Wavelength, Temperature, Emissivity, and Surface Area into the Blackbody Radiation Calculator to get the Spectral Radiance, Peak Wavelength, Total Power, and Wien's Displacement results.
Calculated Impedance
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Required Trace Width
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Effective Dielectric Constant
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Differential Impedance
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PCB impedance is the resistance to AC current flow in a trace. Controlled impedance is crucial for signal integrity in high-speed digital circuits, preventing reflections and ensuring proper signal transmission.
Microstrip traces are on the surface of the PCB with dielectric on one side and air on the other. Stripline traces are embedded between dielectric layers, providing better isolation but slightly higher loss.
These calculations provide good approximations based on IPC-2141 standards. For critical applications, use field solver software or consult your PCB manufacturer for precise stackup calculations.
Standard FR4 has a dielectric constant (εᵣ) of approximately 4.3-4.5 at 1 MHz. High-frequency applications may require low-loss materials with different εᵣ values.
Differential impedance is used for differential pairs like USB, Ethernet, or high-speed digital signals. Common values are 90Ω, 100Ω, or 120Ω depending on the application.
For 50Ω single-ended traces on standard FR4, start with 8-10 mil width. For 100Ω differential pairs, start with 5-6 mil width and 5-6 mil spacing.
Thicker traces have lower impedance. Standard PCB copper is 0.5 oz (0.7 mil) or 1 oz (1.4 mil). Thicker copper reduces impedance and improves current carrying capacity.