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12101C474KAT2A Datasheet(PDF) 94 Page - AVX Corporation |
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12101C474KAT2A Datasheet(HTML) 94 Page - AVX Corporation |
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94 / 99 page  93 Surface Mounting Guide MLC Chip Capacitors Component pads should be designed to achieve good solder filets and minimize component movement during reflow soldering. Pad designs are given below for the most common sizes of multilayer ceramic capacitors for both wave and reflow soldering. The basis of these designs is: • Pad width equal to component width. It is permissible to decrease this to as low as 85% of component width but it is not advisable to go below this. • Pad overlap 0.5mm beneath component. • Pad extension 0.5mm beyond components for reflow and 1.0mm for wave soldering. D1 D2 D3 D4 D5 Case Size D1 D2 D3 D4 D5 0201 0.85 (0.033) 0.30 (0.012) 0.25 (0.010) 0.30 (0.012) 0.35 (0.014) 0402 1.70 (0.067) 0.60 (0.024) 0.50 (0.020) 0.60 (0.024) 0.50 (0.020) 0603 2.30 (0.091) 0.80 (0.031) 0.70 (0.028) 0.80 (0.031) 0.75 (0.030) 0805 3.00 (0.118) 1.00 (0.039) 1.00 (0.039) 1.00 (0.039) 1.25 (0.049) 1206 4.00 (0.157) 1.00 (0.039) 2.00 (0.079) 1.00 (0.039) 1.60 (0.063) 1210 4.00 (0.157) 1.00 (0.039) 2.00 (0.079) 1.00 (0.039) 2.50 (0.098) 1808 5.60 (0.220) 1.00 (0.039) 3.60 (0.142) 1.00 (0.039) 2.00 (0.079) 1812 5.60 (0.220) 1.00 (0.039) 3.60 (0.142) 1.00 (0.039) 3.00 (0.118) 1825 5.60 (0.220) 1.00 (0.039) 3.60 (0.142) 1.00 (0.039) 6.35 (0.250) 2220 6.60 (0.260) 1.00 (0.039) 4.60 (0.181) 1.00 (0.039) 5.00 (0.197) 2225 6.60 (0.260) 1.00 (0.039) 4.60 (0.181) 1.00 (0.039) 6.35 (0.250) Dimensions in millimeters (inches) REFLOW SOLDERING WAVE SOLDERING Component Spacing For wave soldering components, must be spaced sufficiently far apart to avoid bridging or shadowing (inability of solder to penetrate properly into small spaces). This is less important for reflow soldering but sufficient space must be allowed to enable rework should it be required. Preheat & Soldering The rate of preheat should not exceed 4°C/second to prevent thermal shock. A better maximum figure is about 2°C/second. For capacitors size 1206 and below, with a maximum thickness of 1.25mm, it is generally permissible to allow a temperature differential from preheat to soldering of 150°C. In all other cases this differential should not exceed 100°C. For further specific application or process advice, please consult AVX. Cleaning Care should be taken to ensure that the capacitors are thoroughly cleaned of flux residues especially the space beneath the capacitor. Such residues may otherwise become conductive and effectively offer a low resistance bypass to the capacitor. Ultrasonic cleaning is permissible, the recommended conditions being 8 Watts/litre at 20-45 kHz, with a process cycle of 2 minutes vapor rinse, 2 minutes immersion in the ultrasonic solvent bath and finally 2 minutes vapor rinse. D1 D2 D3 D4 D5 Case Size D1 D2 D3 D4 D5 0603 3.10 (0.12) 1.20 (0.05) 0.70 (0.03) 1.20 (0.05) 0.75 (0.03) 0805 4.00 (0.15) 1.50 (0.06) 1.00 (0.04) 1.50 (0.06) 1.25 (0.05) 1206 5.00 (0.19) 1.50 (0.06) 2.00 (0.09) 1.50 (0.06) 1.60 (0.06) Dimensions in millimeters (inches) ≥1mm (0.04) ≥1.5mm (0.06) ≥1mm (0.04) Component Pad Design |
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