1. What is PCB Microstrip Inductance?

Definition: This calculator estimates the inductance of a microstrip trace on a printed circuit board (PCB).

Purpose: It helps electronics engineers design PCBs by calculating the parasitic inductance of traces, which affects signal integrity and power distribution.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Inductance (Henries)
• \( \mu_0 \) — Permeability of free space (4π×10⁻⁷ H/m)
• \( \text{length} \) — Trace length (meters)
• \( h \) — Height above ground plane (meters)
• \( w \) — Trace width (meters)

Explanation: The formula calculates the partial inductance of a microstrip trace above a ground plane.

3. Importance of Microstrip Inductance

Details: Trace inductance affects signal propagation, power integrity, and electromagnetic interference (EMI) in high-speed circuits.

4. Using the Calculator

Tips: Enter the trace length, height above ground plane (default 1.6mm), and trace width (default 2mm). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical height above ground plane?
A: For standard FR4 PCBs, typical height is 1.6mm (0.0016m) for 2-layer boards.

Q2: How does trace width affect inductance?
A: Wider traces have lower inductance. Doubling width reduces inductance by about 30%.

Q3: What's the range of typical trace inductances?
A: Typical values range from 1-10 nH/cm (nanohenries per centimeter).

Q4: Does this account for dielectric material?
A: This simplified formula assumes air dielectric. For FR4, actual inductance may be slightly lower.

Q5: When is trace inductance important?
A: Critical for high-speed digital circuits, RF designs, and power distribution networks.