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Application Note 

28 

<Revision 2.4>  

<<2019-06-17>> 

Assembly Instructions for the Easy-PressFIT Modules 

 

 

 

 

Figure 24 

Zoom illustration of final system assembly (drawing not true to scale) 

Please note that using this press concept with a remaining air gap does not allow the PCB to be screwed down 
to the stand-offs (guiding holes) as shown in chapter 6. 

 

12.3

 

Press-in and mouting only Easy3B modules with PCB and heat sink 

If only Easy3B modules are used in the system, in principle a shorter distance keeper can be applied. The 
general principle should be kept as descriped in Chapters 12.1 and 12.2. 

 

 

Figure 25 

Typical distance keeper for Easy3B modules 

 

distance keeper 
typical 12.2±0.1 

Содержание PressFIT

Страница 1: ...cess 6 3 1 Press in tools 6 3 1 1 Press in tools for Easy modules with thermal interface material 7 3 2 Press in forces and speed 9 4 The press out process 10 4 1 Press out tools 10 4 2 Press out forc...

Страница 2: ...as been used for decades in a wide variety of applications and has been adapted for use in the various modules The Easy PressFIT contact allows solderfree assembly of the EasyPIM EasyPACK and Easy Aut...

Страница 3: ...e DCB is fully supported in the press tool and the press in forces affect the DCB and not the housing Figure 3 Forces on the housing during module handling should be avoided to prevent a push out of t...

Страница 4: ...dhered to If the specification of PressFIT holes is limited to only the finished dimension i e the metallized hole different drill sizes could be used depending on the PCB manufacturer and production...

Страница 5: ...m the middle of the pins to other components must be observed A distance of 5 mm is recommended similar to Infineon s Econo PressFIT power modules A PressFIT module can be replaced up to two times Thi...

Страница 6: ...each other The pressure plate should be mechanically fixed in position without any tolerance The module is then pressed into the PCB in a regular motion The module pins should penetrate the PCB durin...

Страница 7: ...l after pressing In this way the modules can be mounted on the heat sink with a good thermal connection Figure 6 Press fitting tools for Easy1B shown left Easy2B shown right Figure 7 Press fitting too...

Страница 8: ...face is only exemplary and not fixed for all products within the Easy family The stamp should not touch the TIM material during press in That is why the stamp only touches the substrate areas without...

Страница 9: ...aximum PressFIT force per pin PressFIT speed 25 mm min according to IEC 60352 5 qualification 100 mm min recommended PressFIT forces per pin Typ 85 N 100 N max Table 2 PressFIT speed and forces per pi...

Страница 10: ...CB and module are not damaged Once the PressFIT zone has been lifted from the PCB the module falls onto the tray in the lower part of the tool and is separated from the board Figure 10 Extrusion of an...

Страница 11: ...eft and Easy2B right modules The drawing can be adjusted according to requirements and the tools produced by a manufacturer of choice 4 2 Press out forces To press a module out of a PCB a force of app...

Страница 12: ...us contact technologies Siemens norm SN 29500 5 edition 2004 06 Part 5 Process Conductor diameter in mm Failure rate ref in FIT1 Notes Standards guidelines Solder manual Automatic _ 0 5 0 03 IPC 6102...

Страница 13: ...the conditions according to the norm The green fields show the test conditions according to the norm which is less critical than in the individual tests Figure 12 Extract from qualification test Furth...

Страница 14: ...rt The effective length of the thread in the stand off should have a minimum of 4 mm and a maximum length of 8 mm The initial 1 5 mm of the mounting stand off serves as guidance only and cannot take a...

Страница 15: ...isive influence on the heat transfer of the entire system The contact surfaces the surface below the module and the surface of the heat sink have to be free of degradation and contamination to prevent...

Страница 16: ...esistance Before the module is mounted onto the heat sink an even layer of thermal grease 80 m thick for Easy1B 2B and 60 m thick for Easy3B is recommended be applied to the module base or to the heat...

Страница 17: ...to the PCB or if a later disassembling of the module is desired the PCB must contain suitable through holes The hole size depends on the screwdriver size or the screw s head diameter or washer The mod...

Страница 18: ...crew can be applied initially It is important that the module does not lift up To prevent this tighten the first screw loosely to avoid a press force to the clamp Figure 16a Then tighten the second sc...

Страница 19: ...sink so that the mounting area of the module is congruent with the threaded holes in the heat sink Make sure that there are no foreign objects between the module and the heat sink The module can be fi...

Страница 20: ...g process Table 5 Recommended parameters for heat sink mounting Description Values Mounting screw M5 Recommended mounting torque Mamax 1 5 Nm Recommended property class of bolt 4 6 5 6 Minimal thread...

Страница 21: ...y only be subjected to a maximum press and pull force of 6 N vertical to the heat sink The overall pulling force to the module of 20 N must not be exceeded The compressive force could be 10 times high...

Страница 22: ...ing must be taken Figure 20 Air path between clip and PCB for Easy1B and Easy2B packages The minimum clearance distance between the screw and the PCB depends on the screw itself For Easy1B and Easy2B...

Страница 23: ...6 17 Assembly Instructions for the Easy PressFIT Modules In any case the application specific clearance and creepage distances have to be checked and compared to relevant standards and guaranteed by s...

Страница 24: ...ws the press tool with the PCB ready for module assembly In Figure 22d the module is placed on the guiding elements The module is released and the module pins are inserted into the PCB Figure 22e show...

Страница 25: ...Application Note 25 Revision 2 4 2019 06 17 Assembly Instructions for the Easy PressFIT Modules...

Страница 26: ...or a single module application Figure 23b shows the process where the PCB with the pre assembled modules is placed on the cooling system and the modules are fixed with screws via the spring clamp of...

Страница 27: ...The Figure 24 shows a zoom of the final system assembly Depending on the height of the module a small air gap remains between module and PCB As the value H of Figure 23b must not be higher than the mo...

Страница 28: ...air gap does not allow the PCB to be screwed down to the stand offs guiding holes as shown in chapter 6 12 3 Press in and mouting only Easy3B modules with PCB and heat sink If only Easy3B modules are...

Страница 29: ...B is fixed to the cooler Figure 26c shows the fixing of the PCB to the heatsink As the height tolerance of the module is quasi compensated in the press process the fixing points for the PCB can be clo...

Страница 30: ...les Revision History Major changes since the last revision Page or reference Description of change Chapter 3 1 Insertion of illustration about press in tools for Easy3B Chapter 9 2 Insertion of assemb...

Страница 31: ...nt of intellectual 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...

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