1. What is a PCB Through Hole Size Calculator?

Definition: This calculator determines the appropriate hole size for PCB through-hole components based on the component lead diameter.

Purpose: It helps PCB designers and engineers create proper through-hole sizes for component leads in printed circuit board designs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Hole Size — Recommended drill size for the PCB (mm)
• Lead Diameter — Diameter of the component lead (mm)
• 0.25 mm — Standard clearance allowance for through-hole components

Explanation: The formula adds a standard 0.25mm clearance to the lead diameter to ensure proper fit while allowing for manufacturing tolerances.

3. Importance of Proper Hole Sizing

Details: Correct hole sizing ensures components fit properly while allowing for soldering. Too tight may damage components during insertion, while too loose may cause soldering issues.

4. Using the Calculator

Tips: Simply enter the component lead diameter in millimeters. The calculator will add the standard 0.25mm clearance automatically.

5. Frequently Asked Questions (FAQ)

Q1: Why is 0.25mm the standard clearance?
A: This provides enough space for easy component insertion while maintaining good solder joint formation.

Q2: Can I use different clearance values?
A: Yes, some designs may use 0.2mm for tight fits or 0.3mm for wave soldering applications.

Q3: How do I measure lead diameter?
A: Use calipers to measure the component lead, or check the component datasheet for specifications.

Q4: Does this work for all component types?
A: This is a general rule for standard through-hole components. Some specialized components may require different clearances.

Q5: What about plated through holes?
A: The calculation includes plating thickness in the standard 0.25mm allowance.