Calculators » Microstrip Max Current Calculator | PCB Safety

Microstrip Max Current Calculator | PCB Safety

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This tool calculates the maximum current that a microstrip trace on a PCB can safely carry without exceeding temperature limits or causing damage to the PCB. It takes into account the trace width, thickness and the allowable temperature rise. This is essential for ensuring reliable operation of RF and microwave circuits.

Why is Microstrip Max Current Important?

Microstrip traces on PCBs must be designed to handle the expected current loads without overheating. Exceeding the maximum current can lead to trace damage, PCB failure and compromised performance of the entire system. This calculator helps designers ensure that their microstrip traces are capable of safely carrying the required current.

This calculator is commonly used in RF and microwave PCB design to determine the safe current carrying capacity of microstrip traces.

EXAMPLE:

INPUTS:
- Allowable Temperature Rise = 10 °C
- Trace Width = 20 mils
- Trace Thickness = 1 oz/ft² (approximately 1.37 mils)
OUTPUT:
- Cross sectional Area = 27.4 mil²
- Maximum Current = 1.45 A

Microstrip Max Current Formula

The following equation or formula is used for the Microstrip Max Current calculator:

Microstrip max. current Formula

Where:

I = Maximum current, Amps (A)
ΔT = Allowable temperature rise (°C)
A = Cross sectional area of the trace (mil²)
k = Constant (0.024 for external layers, 0.048 for internal layers)
b = Exponent (0.44 for external layers, 0.725 for internal layers)
c = Exponent (0.725 for external layers, 0.44 for internal layers)

Key benefits

Prevent Overheating: Ensures microstrip traces are designed to avoid excessive heat buildup.
Enhance Reliability: Helps maintain the integrity and performance of RF and microwave circuits.
Optimize PCB Design: Assists in selecting appropriate trace dimensions for current carrying needs.

Summary

By using this Microstrip Max Current Calculator, designers can ensure that their PCB microstrip traces are capable of safely carrying the required current loads, thus preventing potential damage and ensuring reliable operation of RF and microwave systems.