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 [email protected] 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 [email protected] 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 • CUSTOM DESIGN • DIVERSE FIELDS OF APPLICATION • IN-HOUSE MANUFACTURING – FROM RAW MATERIAL TO FINISHED PRODUCT • COMPETITIVE PRICING, FLEXIBILITY AND SWISS QUALITY • WORLDWIDE PRESENCE • EFFECTIVE MANAGEMENT SYSTEM • PRESTIGIOUS CLIENT BASE • HIGHLY SKILLED AND MOTIVATED 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 [email protected] www.precidip.com