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P6002ACMC датащи(PDF) 185 Page - Teccor Electronics |
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P6002ACMC датащи(HTML) 185 Page - Teccor Electronics |
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185 / 212 page ![]() SIDACtor Soldering Recommendations © 2002 Teccor Electronics 5 - 23 http://www.teccor.com SIDACtor® Data Book and Design Guide +1 972-580-7777 not exceed 275 °C and the maximum temperature of the plastic body does not exceed 250 °C. (Figure 5.8) Figure 5.7 Principle of Vapor Phase Soldering Figure 5.8 Reflow Soldering Profile During reflow, the surface tension of the liquid solder draws the leads of the device towards the center of the soldering area, correcting any misalignment that may have occurred during placement and allowing the device to set flush on the pad. If the footprints of the pad are not concentrically aligned, the same effect can result in undesirable shifts as well. Therefore, it is important to use a standard contact pattern which leaves sufficient room for self-positioning. After the solder cools, connections should be visually inspected and remnants of the flux removed using a vapor degreaser with an azeotrope solvent or equivalent. Transport Cooling pipes PC board Heating elements Boiling liquid (primary medium) Vapor phase zone Vapor lock (secondary medium) Time (Seconds) 0 0 20 40 60 80 100 120 140 160 180 200 220 240 30 60 90 120 150 180 210 240 270 300 Pre-heat Soak Reflow Cool Down 0.5 - 0.6 ˚C/s 1.3 - 1.6 ˚C/s <2.5 ˚C/s <2.5 ˚C/s Peak Temperature 220 ˚C - 245 ˚C Soaking Zone Reflow Zone Pre-heating Zone ( 2 min. MAX ) 60 - 90 s typical ( 2-4 min MAX ) ( 2 min. MAX ) 30 - 60 s typical 260 |
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