Quick Answer
Calculate PCB Solder Joint Differential Impedance Calculator
Calculator
Result Interpretation
PCB Solder Joint Differential Impedance Calculator computes Differential impedance in ohm using the defined engineering formula and the input values provided.
Worked Example
Verified calculation
Given:
- Effective dielectric height (trace to reference plane) = 0.0001
- Trace center-to-center spacing = 0.00015
- Trace thickness = 3.5E-5
- Solder joint height (solder fillet thickness) = 7.0E-5
- Single-ended characteristic impedance = 50
Expected Result:
- Differential impedance = 98.218877803938
Engineering Interpretation:
Under the given input conditions, the calculated result is: Differential impedance = 98.218877803938 ohm.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
differential impedance = 2 * single-ended characteristic impedance * sqrt(1 - (0.48 * exp(-0.65 * (trace center-to-center spacing / trace to reference plane))) * (1 - (trace thickness / trace to reference plane)) * (1 - (solder fillet thickness / trace to reference plane)))Formula family: formula_pcb_solder_joint_differential_impedance_calculator
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| Z0_single | Single-ended characteristic impedance | INPUT | Single-ended characteristic impedance |
| s | Trace center-to-center spacing | INPUT | Trace center-to-center spacing |
| h | Effective dielectric height (trace to reference plane) | INPUT | Effective dielectric height (trace to reference plane) |
| t | Trace thickness | INPUT | Trace thickness |
| d_solder | Solder joint height (solder fillet thickness) | INPUT | Solder joint height (solder fillet thickness) |
| Differential impedance | Differential impedance | OUTPUT | Differential impedance |
Calculation Steps
- Enter the single-ended characteristic impedance in ohm.
- Enter the trace center-to-center spacing in m.
- Enter the effective dielectric height (trace to reference plane) in m.
- Enter the trace thickness in m.
- Enter the solder joint height (solder fillet thickness) in m.
- Step 1: Compute differential impedance.
- Read the differential impedance (ohm) from the results.
Engineering Summary
Calculate PCB Solder Joint Differential Impedance Calculator
Frequently Asked Questions
What does this calculator calculate?
The PCB Solder Joint Differential Impedance Calculator estimates Differential impedance based on the input parameters you provide
Why is single-ended characteristic impedance important in this calculation?
single-ended characteristic impedance is directly proportional to differential impedance. When you enter single-ended characteristic impedance in ohm, the calculator uses it in the engineering formula to compute the output
How should I interpret the result differential impedance?
The calculator outputs differential impedance in ohm. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Single-ended characteristic impedance (ohm), Trace center-to-center spacing (m), Effective dielectric height (trace to reference plane) (m), Trace thickness (m), Solder joint height (solder fillet thickness) (m). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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