Application Note
2
<Revision 2.4>
<<2019-06-17>>
Assembly Instructions for the Easy-PressFIT Modules
1
General information
PressFIT is an alternative method for connecting control and load current contacts on IGBT modules to a PCB
(printed circuit board) that complies with the requirements for greater durability, the trend towards higher
temperatures, RoHS and, of course, very simple handling.
This contact technology has already been employed for years in the automotive sector under the most difficult
of conditions, and with medium-sized currents. The contacts have also been used in the telecommunications
sector for some time now for signal transmissions. This type of contact is therefore ideal for use in IGBT
modules for which the contacts have to meet the requirements for load, control and sense connections.
The PressFIT contact technology for power modules was initially developed in the EconoPIM™ and
EconoPACK™ series.
The Easy PressFIT pin provides a solution for modules without a baseplate. It should be noted in the case of the
Easy PressFIT geometry that it has 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 Automotive
modules in the EasyB series. In this assembly technology, the module can be mounted on either side of the
circuit board.
The electrical and thermal contacts with the circuit board are implemented by means of cold welding. The
contacts can be used in standard FR4 PCB with the typical tolerances of manufacturers.
Figure 1
Modules in the EasyB series featuring PressFIT contacts
Easy PressFIT contacts have an area of approximately 1.7 mm that adapts itself to the hole in the PCB during
the press-in process. The plastic is deformed as a result. This deformation is intended to accommodate the
tolerance, and provides the basis for the cold welding.
The forces resulting during the PressFIT process ensure that the welded materials on the PCB and pin exhibit a
continuously consistent – and, unlike other contact technologies – very small electrical contact resistance
(approximately 0.05 mΩ). Figure 2 shows various sections and REM images that provide a view of the gas-tight
bonded materials resulting from the press-in force.
Figure 2
Easy PressFIT contact sections
