![]() Therefore, the three possible minimum hole size are equal to:įor the Pad Diameter we calculate its values using this formula: Looking into CF14JT1K00TR-ND datasheet we found out that the nominal value for its maximum lead diameter is equal to 0.55mm. These values are given on the parts datasheet or package drawing. This can vary depending on the shape of the lead, as shown on figure 1, we have a Round PTH Lead, Rectangle PTH Lead and a Square PTH Lead. To calculate for the minimum hole size for this resistor we should first determine its maximum lead diameter. Minimum Hole Size = Maximum Lead Diameter + 0.15mm (for Level C of IPC-2222) Maximum Lead diameter for Different Types of Holes 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) The formula for the minimum hole size are as follows: ![]() Determine the minimum plated through hole and the pad diameter for resistor CF14JT1K00TR-ND according to IPC-7251, IPC-2222 and IPC-2221 standards.įor Level A Minimum Hole Size = 0.55mm + 0.25mm = 0.80mmįor Level B Minimum Hole Size = 0.55mm + 0.20mm = 0.75mmįor Level C Minimum Hole Size = 0.55mm + 0.15mm = 0.70mm
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