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May, 2017
Reducing Stack Height with Low-Profile SMT Connectors
Continued from page 68
mated board assembly processes. Connector Solution To fulfill this assortment of
challenging requirements for a robust interconnect for tightly- packed, stacked circuit boards, a con- nector system solution was devel- oped using screw-machined termi- nals rather than conventional stamped-and-formed terminals. The connector system consists of a header and a receptacle. The header or male connector
has a terminal (pin), an insulator and a stamped lead frame. The receptacle has a protective female shell with internal six-finger contact, an insula- tor, and a stamped lead frame. Achieving the tolerances re -
quired for precision contacts to be set in a dense, 1 mm (0.04 in.) pitch calls
height achieved with a board-to- board connector system, including the length of the contact pins and the thickness of the insulator material used in the connectors. For this new, low profile connec-
tor system design, the choice of insu- lator material was important not only for its contributions to the height of the mated connector but for its electrical characteristics. As an insulator, the material must provide suitable isolation between closely spaced connector contacts for mini- mal crosstalk. But, it must do so with minimal
contributions to the total height of a mated connector pair. The insulator material chosen for the new low-pro- file SMT connector system is a high- temperature liquid crystal polymer (LCP). It exhibits insulation resist- ance of greater than 1,000 MW, achiev-
The Mezza-pede SMT connector with 1 mm (0.04 in.) pitch contacts achieves a stack height as low as 3.4 mm (0.13 in.).
for exceptional screw-machining capa- bilities. This approach is capable of yielding a high-performance connector system with fine features. Combining the precision toler-
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ances of screw-machined socket ter- minals and stamped multi-finger contacts contributes to securing long- term connections of mated connector halves. The screw-machined termi- nals with their multi-finger contacts account for the SMT connector sys- tem’s long operating lifetimes for critical applications, such as in telecommunications systems. This low-profile connector sys-
tem, from Advanced Interconnections, is the Mezza-pede® SMT connector. It is a two-piece connector system with a header and a receptacle for mounting on circuit boards to be stacked and interconnected or used in a cable-to- board configuration. The terminals are set on a 1 mm
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(0.04 in.) pitch in dual-row configura- tions with various pin counts. The con- nector system is characterized by a short stack height when compared with conventional connectors designed for stacking PCBs. With stack heights as low as 3.4 mm (0.13 in.), these low- profile connectors enable assembly of stacked PCBs for the tightest installa- tion spaces.
Low-Profile Interconnection For any two-piece connector
sales@lcd-module.com ·
www.lcd-module.com
system designed for stacking cir- cuit boards, the height of the mated connector halves will impact the z- axis, usually documented as the stack height of the mated PCBs with that connector system. This is essentially the distance from the bottom of the upper PCB to the top of the lower PCB. A number of connector compo- nent issues contribute to the stack
ing high isolation between closely spaced, 1 mm (0.04 in.) pitch contacts. Additional materials for the low
profile SMT connectors were careful- ly selected to complement the high- temperature capabilities of the LCP insulator material for compliance with RoHS-2, lead-free soldering processes, including the use of matte tin plating. The connectors are usable at operating temperatures up to 125°C (257°F) and are tested for durability by 20-day mixed-flow-gas (MFG) testing. In MFG tests, the ambient tem-
perature, relative humidity, concen- tration of gaseous pollutants, and other environmental variables are controlled and monitored to simulate environmental phenomena related to corrosion and how the connectors will weather those conditions. The testing is meant to reproduce, at an accelerated rate, typical environmen- tal conditions contributing to corro- sion and equipment failures so that they can be minimized. These SMT connectors with
screw-machined terminals manage to achieve low stack heights without compromising performance, operat- ing lifetime or reliability of connec- tion. Available in tape-and-reel pack- aging for automated assembly, the connectors show that several manu- facturing techniques, such as the use of screw-machined and stamped metal components, can be combined practically to create a connector sys- tem that meets demanding applica- tion requirements without sacrificing performance or ease of use. Contact: Advanced Interconnections Corp., 5 Energy Way, West Warwick, RI 02893 % 401-823-5200 E-mail:
info@advanced.com Web:
www.advanced.com r
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