compliant press-fit technology

PRESS-FIT
TECHNOLOGY
A COST-EFFECTIVE ALTERNATIVE
TO SOLDERING PROCESSES
swiss world connects
COMPLIANT PRESS-FIT
TECHNOLOGY
WWW.PRECIDIP.COM
TEL +41 32 421 04 00
SALES@PRECIDIP.COM
BASIC TECHNOLOGY
Press-fit technology, which has been around for some 25 years
now, is a solderless connection method. It consists in force fitting an oversized contact pin into the plated through hole of
a printed circuit board (PCB). The high radial pressure produces
a deformation, resulting in a gas-tight electrical connection of
high quality.
This difference in pin cross section and hole diameter results
in a deformation of either the PCB hole or the cross section
of the pin during the insertion process of pin into PCB hole.
There are two major types of press-fit sections:
No deformation of the solid pin during the insertion
process (Fig.A):
With square or hexagonal cross section greater than
PCB finished hole diameter, the deformation takes place
on the PCB side.
Fig.A: Cross-section solid pin
COMPLIANT PRESS-FIT TECHNOLOGY BY PRECI-DIP
We have been producing contacts, sockets and connectors with press-fit terminations for over ten years.
The specific design of our compliant pin is based on
a «modified eye of a needle» principle with particular
attention paid to material geometry, elasticity characteristics, and surface finish. Its main features are:
• Elastic deformation over the total range of the hole
tolerance
• High retention force, in spite of the low insertion force
(well below generally admitted maximum values)
• Gas-tight contact zone without any damage (chipping)
to hole metallisation
• Low, constant electrical contact resistance
• Complies with IEC60352-5 standard
A compliant pin which compresses as a
result of insertion into the PCB through hole (Fig.B):
With radial elasticity in the contact zone, the deformation takes place on the contact side.
Fig.B: Cross-section compliant pin
Over the years, the compliant pin technology for
press-fit insertion gained general recognition over
the solid pin.
Solid press-fit pin
COMPLIANT PRESS-FIT TECHNOLOGY WITH
CONNECTING PIN
For applications requiring connections on both sides of
the PCB, the press-fit termination is extended in
the form of an additional contact pin which mates with
the female contact of another PCB. This type of contact
also has the «modified eye of a needle» to give superior
quality of the press-fit connection.
It is presently only available for 1 mm diameter
PCB holes.
They are available for plated hole diameters of 0.6, 0.7,
0.9 and 1.0 mm, according to IEC standards. They are
compatible with PCB finishes in tin, copper, or gold over
nickel.
Compliant press-fit with connecting pin
PRECI-DIP compliant press-fit
pin based on a «modified eye
of a needle» principle
Micrograph cross section
of an inserted compliant pin
TECHNICAL SPECIFICATIONS
WWW.PRECIDIP.COM
TEL +41 32 421 04 00
SALES@PRECIDIP.COM
ADVANTAGES OF PRESS-FIT OVER
SOLDER-BASED TECHNOLOGY
GENERAL SPECIFICATIONS
OPERATING TEMPERATURE RANGE
The basic advantages of press-fit
technology are obvious, in particular
when it comes to adding contacts
or connectors to a soldered SMD board:
PIN MATERIAL
PIN PL ATING
PRESS-FIT CHARACTERISTIC MEASURED ACC. TO IEC 60352-5 (SINGLE PIN)
PRESS-IN FORCE
PUSH-OUT FORCE
• Efficient, reliable and quick assembly
of connectors, without
any mounting accessories (screws,
brackets, etc.)
-55 to +125 °C
Bronze CuSn4Pb4Zn4 (C54400)
Tin over Nickel
PUSH-OUT 3RD CYCLE
90 N max. (at min. hole diameter) / 65 N typ
30 N min. (at max. hole diameter) / 50 N typ.
20 N min. (at max. hole diameter)
PCB HOLE SPECIFICATIONS: DIMENSIONS
NOMINAL HOLE DIAMETER
DIAMETER FINISHED HOLE
DIAMETER DRILLED HOLE
• No soldering problems
(such as thermal load on PCB and
components, degassing, hole filling
on multilayer, bridging, cold soldering
joints...)
0.6 mm
0.7 mm
0.9 mm
1.0 mm
0.6 +/- 0.05 mm
0.7 +0.07/-0.05 mm
0.9 +0.07/-0.05 mm
1.0 +0.09/-0.06 mm
0.7 +/- 0.02 mm
0.8 +0.03/-0.02 mm
1.0 +/- 0.02 mm
1.15 +/- 0.025 mm
• No residues on PCB and connector
contact area, affecting reliability
PCB HOLE SPECIFICATIONS: PLATING
• Complete reparability (connectors
can be easily exchanged)
PCB SURFACE FINISH
TIN
COPPER
GOLD OVER NICKEL
THICKNESS - COPPER
min. 25 μm
5 - 15 μm
–
–
min. 25 μm
–
–
–
min. 25 μm
2.5 - 5 μm
0.05 - 0.2 μm
THICKNESS - TIN
THICKNESS - NICKEL
THICKNESS - GOLD
Press-fit connections are easily added to
an SMD board after reflow soldering of
the components, as the hole metallisation
is not affected by this process.
… FROM OUR CATALOG
Socket and pin contacts with compliant press-fit terminations are
currently available in our catalog as single contacts and for a multitude
of sockets and connectors, in standard or customised versions, such as:
ASSEMBLY WITH THE PRINTED
CIRCUIT BOARD
Assembly of press-fit connectors and sockets with the PCB requires only
simple tooling which can be installed on
a small press: a base plate with holes
corresponding to the hole pattern of
the PCB and an upper tool.
More sophisticated equipment (semiautomatic or automatic for volume
production) is also available on the
market.
RoHS COMPLIANCY
Exception No. 6 of Directive 2002/95/EC
allows tin-lead plating for press-fit
contacts.
DIL SOCKETS
PGA SOCKETS
Pitch 2.54 mm (Series 146)
Interstitial or 2.54 mm grid (Series 546)
PCB CONNECTORS
SOCKETS
Pitch 2 mm , standard or with polarization (Series 831-833)
Pitch 2.54 mm with mating pin ø 0.47 mm
(Series 346/356 and 801/803)
Pitch 2.54 mm with mating pin ø 0.76 mm (Series 801/803)
PINS
Pitch 2.54 mm, connecting pin ø 0.47 mm (Series 356/456 )
Pitch 2.54, connecting pin ø 0.76 mm, standard or shrouded
version (Series 800/802/804)
ENJOY THE BENEFITS
HEADED FOR SUCCESS
Awards from prestigious institutions and customers. Major certifications.
Worldwide recognition. For ongoing innovation, perfect teamwork,
environmental responsibility as well as entrepreneurial excellence and
sustained growth. In short, for swiss quality.
• COMPLETE RANGE OF HIGHLY RELIABLE
INTERCONNECT COMPONENTS
• STRONG CUSTOMER SUPPORT
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• IN-HOUSE MANUFACTURING – FROM RAW
MATERIAL TO FINISHED PRODUCT
• COMPETITIVE PRICING, FLEXIBILITY
AND SWISS QUALITY
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WORKFORCE
CHOOSE THE BEST CONNECTION
AROUND THE WORLD
More than 100 Distributors around the world distribute preci-dip products
across the five continents.
www.precidip.com
PHONE
PRECI-DIP SA Rue Saint-Maurice 34 P.O.Box 834 CH-2800 Delémont / Switzerland
+41 (0)32 421 04 00 FA X +41 (0)32 421 04 01 E - M A I L sales@precidip.com www.precidip.com