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| decap:epoxy_acid [2019/12/07 23:21] – [Table] mcmaster | decap:epoxy_acid [2019/12/07 23:38] – [Table] mcmaster |
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| General recommendation for pre-milling packages | General recommendation for pre-milling packages |
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| ^ Package ^ Pin pitch ^ Package thickness ^ Package width ^ Depth target ^ Endmill size ^ Notes ^ | ^ Package ^ Pin pitch ^ Package thickness ^ Package width ^ Package length ^ Depth target ^ Endmill size ^ Notes ^ |
| | PDIP8 | 0.3" | | | | | | | | PDIP8 | 0.3" | | | | | | | |
| | PDIP18 | 0.3" | 0.13 | 0.25" | 0.030 to 0.035 | 3/16 (0.1875)" | | | | PDIP18 | 0.3" | 0.13 | 0.25" | | 0.030 to 0.035 | 3/16 (0.1875)" | | |
| | PDIP28 | 0.3" | 0.13 | 0.27" | 0.030 to 0.035 | 3/16 (0.1875)" | | | | PDIP28 | 0.3" | 0.13 | 0.27" | 1.39" | 0.030 to 0.035 | 3/16 (0.1875)" | | |
| | PDIP28 | 0.5" | 0.15 | | 0.035 to 0.040" | 3/8 (0.375)" | | | | PDIP28 | 0.5" | 0.15 | | | 0.035 to 0.040" | 3/8 (0.375)" | | |
| | PDIP40 | 0.5" | 0.15 | | 0.035 to 0.040" | 3/8 (0.375)" | | | | PDIP40 | 0.5" | 0.15 | | | 0.035 to 0.040" | 3/8 (0.375)" | | |
| | TO-99 | | Ceramic: 0.11\\ Epoxy: 0.07 peak | 0.31" | 0.018 to 0.023" | 1/8 (0.125)" | UL914\\ "30 mil down just cut one bond wire"\\ Pins leave about 0.16" center area. However, die is not centered, maybe 0.08" actual center area => 1/8" endmill works well\\ old note: "epoxy layer at its thickest is about 1.6 mm" => 0.063", maybe be more careful on depth? | | | TO-99 | | Ceramic: 0.11\\ Epoxy: 0.07 peak | 0.31" | | 0.018 to 0.023" | 1/8 (0.125)" | UL914\\ "30 mil down just cut one bond wire"\\ Pins leave about 0.16" center area. However, die is not centered, maybe 0.08" actual center area => 1/8" endmill works well\\ old note: "epoxy layer at its thickest is about 1.6 mm" => 0.063", maybe be more careful on depth? | |
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| Don't cool the bit. Heat weakens epoxy. You will go through bits relatively quickly. Carbide bits do last longer, haven't figured out yet if they are cost effective. Be sure to replace a bit if its not cutting well. | Don't cool the bit. Heat weakens epoxy. You will go through bits relatively quickly. Carbide bits do last longer, haven't figured out yet if they are cost effective. Be sure to replace a bit if its not cutting well. |
