1. What is Bond Wire Inductance?

Definition: Bond wire inductance is the property of a wire that opposes changes in current flow, particularly important in high-frequency applications.

Purpose: This calculator helps engineers estimate the inductance of bond wires used in electronic packaging and interconnects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Inductance (henrys)
• \( \mu_0 \) — Permeability of free space (4π×10⁻⁷ H/m)
• \( l \) — Length of the wire (meters)
• \( h \) — Height above ground plane (meters)
• \( r \) — Radius of the wire (meters)

Explanation: The formula calculates the inductance of a straight wire above a ground plane, accounting for the wire's geometry and position.

3. Importance of Bond Wire Inductance

Details: In high-frequency circuits, bond wire inductance can significantly affect signal integrity, power delivery, and overall circuit performance.

4. Using the Calculator

Tips: Enter the wire length, height above ground plane, and wire radius. All values must be > 0. For best results, use consistent units (meters).

5. Frequently Asked Questions (FAQ)

Q1: What is μ₀ (mu-naught)?
A: It's the permeability of free space, a fundamental physical constant equal to 4π×10⁻⁷ H/m.

Q2: How does wire radius affect inductance?
A: Thicker wires (larger radius) have lower inductance due to better current distribution across the cross-section.

Q3: What's a typical bond wire inductance value?
A: Typical values range from 1-10 nH for millimeter-length bond wires in IC packages.

Q4: Does this formula account for wire shape?
A: No, this assumes a straight, cylindrical wire. Curved or looped wires require different calculations.

Q5: How important is height above ground?
A: Very important - inductance increases logarithmically with height as the return current path becomes longer.