Press-Fit Technology

THE NEW VARIPIN

TM Varipin
TM the flexible press-fit contact used byAVX since the mid 1970s has after intensive research been heavily modified in recent years. This research concentrated upon the contactzone and in particular the mechanical aspectsthat guarantee an equal force on the complete contact length and to prevent ‘eye of the needle’ cracking, or the contact itself damaging the PCB.The new configuration was determined by a numeric solution algorithm for elastic and elastoplastic problems within structural mecha- nisms.The objective was the numerical simulation ofthe press-in process of the VARIPIN with the aim of optimizing its form and appearance.

VARIPIN

TM

SPECIFICATION

As a result an optimized style of the VARIPIN
TM according to the required features of the DIN41611 (DIN IEC 48 (Sec.) 334) and the PCB specification is now available with the following advantages: ■ 100% flexible press-fit shank ■ exchange of contacts up to 3 times ■ applicable for pc board thickness ≥ 1.6mm ■ vibration and corrosion safe connection ■ optional plating materials ■ low transition resistance

HOLE SPECIFICATION

Drilled hole1.15 mm Met. hole0.94 mm to 1.09 mm Copper plating25 to 55 micronTin plating5 to 15 micron (max 40 micron available if finished hole is 0.94 mm)Board thickness1.6 to 3.2 mm or greater

INSERTION FORCES

Metal: ≥ 25µm copperPlating:5 to 15µm tin lead[N] During the optimization of the press-in area a special core was created for compliance with the maximum press-in (250N) and minimum push-out (30N) forces specified in DIN 41611.In the diagram to the right the behavior of thepress-in- and push-out forces in relation to the diameter of the hole as well as the diagonal of the press-in pin (1.24 mm) are shown.
706050 Pushoutforce 4030 20100.940.951.031.13 Ø (mm)plated hole1.12min in accordance to DIN 41611 part 5

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