Pad Diameter = Minimum Hole Size + 0.1mm + 0.40mm (for Level C of IPC-2221)Īccording to Level A Minimum Hole Size = 0.80mm Pad Diameter = 1.50mmĪccording to Level B Minimum Hole Size = 0.75mm Pad Diameter = 1.35mmĪccording to Level C Minimum Hole Size = 0.70mm Pad Diameter = 1.20mm Pad Diameter = Minimum Hole Size + 0.1mm + 0.50mm (for Level B of IPC-2221) Pad Diameter = Minimum Hole Size + 0.1mm + 0.60mm (for Level A of IPC-2221) Pad Diameter = Minimum Hole Size + Minimum Annular Ring X 2 + Minimum Fabrication Allowance According to IPC-2221 the Minimum Fabrication Allowance is 0.6mm for Level A, 0.5mm for Level B and 0.4mm for Level C. Calculate the Pad DiameterĪfter you calculate the Minimum Hole Size, you should know that the Minimum Annular Ring isĠ.05mm (50um). Minimum Hole Size = Maximum Lead Diameter + 0.15mm (for Level C of IPC-2222) 3.
Minimum Hole Size = Maximum Lead Diameter + 0.20mm (for Level B of IPC-2222)
Minimum Hole Size = Maximum Lead Diameter + 0.25mm (for Level A of IPC-2222) Minimum Hole Size is calculated according to equations below: The Maximum Lead Diameters for Round, Rectangle and Square types of Holes 2. Square hole shape is used for Square PTH Lead. Rectangle hole shape is used for Rectangle PTH Lead. Round hole shape is used for Round PTH Lead. The maximum lead diameters for all shape types of holes are shown in the picture 1. It is present in the datasheet or package drawing of the component. Find out the Maximum Lead Diameterįirstly you should find out the maximum lead diameter. This article shows how to calculate PTH (Plated Through-Hole) Hole and Pad Diameter sizes according to IPC-7251, IPC-2222 and IPC-2221 standards in the following steps: 1. Home » Tutorials » IPC Standards » How to calculate PTH hole and pad diameter sizes according to IPC-7251, IPC-2222 and IPC-2221 standards? How to calculate PTH hole and pad diameter sizes according to IPC-7251, IPC-2222 and IPC-2221 standards?
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