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PTH Minimum Annular Ring |
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m.elsayed 
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Joined: 22 Sep 2016 Status: Offline Points: 48 |
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 Topic: PTH Minimum Annular RingPosted: 11 hours 19 minutes ago at 5:00am |
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Minimum annular ring is defined in the Options > Terminals > Through-hole
When set to 0.40 mm, does it mean no value than this will be create for any part?
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5851 |
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Posted: 7 hours 37 minutes ago at 8:42am |
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The Hole Diameter for round PTH terminal leads is Max Lead Diameter X 0.20 mm. The Hole Diameter for rectangle PTH terminal leads is Max Lead Diameter X 0.15 mm. The annular is proportional. A 1.00 mm hole = 1.50 mm pad = 0.25 mm annular ring. A 2.00 mm hole = 3.00 mm pad = 0.50 mm annular ring. A 3.00 mm hole = 4.50 mm pad = 0.75 mm annular ring. The Minimum Annular Ring of 0.40 is very robust for tiny PTH packages with fine wire terminal leads (like watch crystals). The pad size would be excessive. Minimum is intended for the smallest terminal lead and hole like a Tuning Fork Crystal. the terminal lead diameter is 0.20 mm and the hole size would be 0.40 mm diameter. A 0.40 minimum annular ring would be a 1.20 mm pad diameter. The pin pitch is only 0.45 mm. This is an example where a 0.40 mm minimum annular ring would be too robust. Too much solder for a tiny hole. |
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