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Additional Information

Revision 6.0

www.infineon.com

page 1 of 20

2020-11-12

Recommendations for Board Assembly of
Infineon Quad Flat Packages

Содержание PG-LQFP

Страница 1: ...al Information Please read the Important Notice and Warnings at the end of this document Revision 6 0 www infineon com page 1 of 20 2020 11 12 Recommendations for Board Assembly of Infineon Quad Flat...

Страница 2: ...1 1 QFP Package Type 4 1 2 Package Features and General Handling Guidelines 4 2 Printed Circuit Board 7 2 1 Routing 7 2 2 Pad Design 7 2 3 Via in Pad Design 9 3 PCB Assembly 11 3 1 Solder Paste Stenci...

Страница 3: ...ge IC Integrated Circuit I O Input Output LF Lead Frame LQFP Low profile Quad Flat Package MQFP Metric Quad Flat Packages MSL Moisture Sensitivity Level Ni Pd Au Nickel Palladium Gold NSMD Non Solder...

Страница 4: ...ches The typical pitch of Low profile Quad Flat Packages LQFP and Thin Quad Flat Packages TQFP is of 0 5 mm The latter also provides a pitch down to 0 4 mm Metric Quad Flat Packages MQFP have a typica...

Страница 5: ...hen soldered to the PCB The distance between the I O lead seating plane and the exposed pad landing area at the package bottom is defined as the package stand off On QFP it can vary around the nominal...

Страница 6: ...of Infineon Quad Flat Packages Package Description Figure 3 Soldered gullwing leads with post mold plated Sn left and with pre plated Ni Pd Au right For further information about the specific compone...

Страница 7: ...ed for QFP components The approach applies to the peripheral terminations as well as to the exposed pads Mixing different pad definition types in one footprint is not recommended The exposed pads of Q...

Страница 8: ...to the lead top plane is used to take into account the lower bend angle The PCB pad and therefore the solder paste print should have a distinct distance to the package mold in order to avoid an uncle...

Страница 9: ...One of the primary exposed pad design objectives besides the thermal management should be to avoid the penetration of the vias by solder Consequences of solder penetration can be a decreased stand of...

Страница 10: ...g voids during reflow soldering In case it is not necessary to provide a direct connection from the solder pad under the exposed die pad to the inner layers of the PCB the vias can be placed next to t...

Страница 11: ...l design adaptations to reach the optimum amount of solder the stencil thickness the PCB pad finish solder mask quality the via layout and the solder paste type should be considered In every case appl...

Страница 12: ...or quality engineer 3 4 Reflow Soldering For PCB assembly of QFP components the widely used method of reflow soldering in a forced convection oven is recommended Soldering in a nitrogen atmosphere ca...

Страница 13: ...urface This shape will be frozen during cooling and therefore will result in a higher stand off on the bottom side after the reflow process Heavy vibrations in a reflow oven may cause devices to drop...

Страница 14: ...lux is recommended whose residues usually do not have to be removed after the soldering process In case the solder joints have to be cleaned the cleaning method e g ultrasonic spray or vapor cleaning...

Страница 15: ...ause the plating does not melt together with the solder during reflow For engineering tasks cross sectioning can offer detailed information about the solder joint quality Due to its destructive charac...

Страница 16: ...t the solder paste and the reflow profile For thermal evaluations the entire thermal path must be considered as well as all boundary conditions such as the application environment or the electrical us...

Страница 17: ...ior to rework might be necessary A proper drying procedure for SMD packages is described in the international J STD 033 standard 5 Please also refer to the recommendations of your PCB manufacturer and...

Страница 18: ...D 3 Electronic Components Industry Association Assembly and Joining Processes and JEDEC Solid State Technology Association Committee EIA IPC JEDEC J STD 002 Solderability Tests for Component Leads Ter...

Страница 19: ...2 Recommendations for Board Assembly of Infineon Quad Flat Packages Revision History Revision History Page or reference Major changes since the last revision Section 6 Rework Update of sample conditio...

Страница 20: ...property rights of any third party with respect to any and all information given in this application note The data contained in this document is exclusively intended for technically trained staff It i...