How Board-to-Board Connectors are Made Robust and Which Influencing Factors Affect the Connector

时间： 2023-09-16 来源：ept News

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Whether used in the fields of aerospace, industrial automation, transportation, or healthcare, Board-to-Board Connectors must always guarantee reliable signal transmission and must not fail under any circumstances. At the same time, they are exposed to wide range of stressors from their environment: Mechanical effects, such as shock, vibration, and oscillations endanger the stability of the data transfer rate, as do thermal and chemical environmental influences caused by extreme temperatures, strong temperature fluctuations, corrosive gases, moisture, and dirt. Manufacturers of high-quality PCB connectors therefore pull out all the stops to arm their board-to-board connectors with the means to withstand these stressors.

Board-to-board Connectors – Robustness Despite Miniaturization

The field of modern electrical engineering is subject to one trend more than ever: miniaturization. Assemblies and their components must not only become increasingly more powerful, but they must also become increasingly smaller. Nevertheless, they are often used in harsh real-world conditions. Components as well as connectors are therefore becoming more and more delicate, while the amount of stress placed on them remains the same. However, a high-quality connector resists this stress not only as well as its older and bigger predecessor, but even better. This is due to further developments in material composition as well as in product design, such as further developments in the geometry of insulator material.

A wide range of influencing factors affects the robustness of a board-to-board connector:

Surface
Contact design
Contact system
Termination technology
Insulator material design
Tolerance range

Influencing Factor – Surface

One influencing factor is the plating. This largely determines the durability of the connector, which is usually measured in mating cycles. When used in the field, the connector is subject to certain micromovements. These lead to abrasions and, as a result, oxide formation. The consequence is an increased level of contact resistance and therefore poorer signal transmission quality.

A high-quality and durable contact coating is therefore decisive as regards surface abrasion.

Influencing Factor – Contact Design

The contacts of a PCB connector are stamped or turned using a CNC machine. When stamped, however, an inhomogeneous, sharp-edged surface that is visible under a microscope is produced on the underside of the stamped strip of material. Conventional systems make contact on this stamped edge, which entails an increased level of surface abrasion and therefore a higher degree of contact resistance.

Influencing factor – Contact System

Traditional two-piece connectors have one male contact and one female contact. However, in the event of strong shock, the male connector may lift off of the female connector. To prevent such an interruption of contact, a double-sided female connector can be used to provide redundancy and thus contact reliability, as the second female contact ensures signal transmission at all times via at least one contact point.

Influencing Factor – Termination Technology

There are several ways to attach connectors to PCBs.

One of these is to use the previously mentioned press-fit technology. The aim of this technology is to achieve the greatest possible retention forces between the connector and the PCB using the least possible amount of press-fit force. The retention forces are decisive for the mechanical connection, which in turn must withstand shock and vibration.

However, press-fit technology is not always suitable, for example, if PCBs are to be assembled on both sides, or if the minimum distance to components in the direction of force cannot be maintained. Surface-mount technology (SMT) is another way to create a reliable and durable connection between the connector and the PCB. Solder paste is used to solder the connectors onto the PCB’s specified connection surfaces: the solder pads.

Influencing Factor – Insulator Material Design

The geometry of a board-to-board connector’s insulator material also helps protect the contacts from being damaged during operation or assembly. It should be designed in such a way that the vulnerable contacts inside the connector are protected.

In addition, inclined insertion surfaces can prevent damage during assembly. They help to compensate for misalignment of the PCBs when mating in any direction. By using an additional capture range, the two connector halves can be plugged together without damage even in the event of a center or angle offset.

Influencing Factor – Tolerance Range

The tolerance range of a connector plays a decisive role in assessing its robustness. Mechanical movements will lead to wear or even damage to the connector if the connector cannot compensate for given tolerances.

In the field, for example, loads are generated not only in the X and Y directions, but also in the Z direction. This raises the question of whether a connector’s mating is absolutely secure. Absolutely secure mating describes the overlap area of the male and female connectors and allows not only different board-to-board distances but – depending on the size of this area – different tolerance ranges as well.

Test Methods

There are various test methods for thoroughly testing board-to-board connectors in terms of their robustness. Variables such as dielectric strength and contact resistance are each considered before and after a load test, and the condition of the contacts is inspected visually. For example, the effects of 500 mating cycles on the connector’s dielectric strength can be tested, or a climatic test can be performed to determine whether several hours at first -55℃ and then 125℃ have a negative effect on the connector’s contact resistance. When performing the temperature shock test, the connector must withstand the rapid fluctuation between these extreme temperatures 100 times for 30 minutes each. The center offset and angle offset during mating, as well as the tolerance range in the mated state, should also not only be checked in theory on the CAD model but should be extensively tested in practice, and the load capacity should be confirmed empirically. It is equally important that different tests that are of critical importance to the plating be performed in combination in order to simulate real conditions. For example, mating cycle tests and corrosive gas tests could be performed in combination to ensure that the connector’s performance in terms of contact resistance and dielectric strength has not deteriorated and that the contacts have not been damaged.

Your Design – Your Choice

There are different robustness criteria that a board-to-board connector must meet depending on the requirements of the application. For example, does it have to compensate for high tolerances? Is it subjected to large shock loads or vibrations? Is it used in environments exposed to intense heat or cold? Or does the connection solution need to be protected from moisture, corrosive gases, or dirt? If a user uses these questions as guidance when selecting their connection solution, they can be sure that their connector is perfectly equipped for use in the field.

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本文由洛希转载自ept News，原文标题为:Whitepaper: How Board-to-Board Connectors are Made Robust and Which Influencing Factors Affect the Connector，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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高达25+Gbps的Colibri®高速连接器

Colibri®高速连接器，支持高达25 Gbps的数据传输速率，适用于高数据传输率的应用。该连接器系统具有0.5 mm的间距，提供多种速度和引脚数量选项，特别适用于COM Express®应用。Colibri®连接器具有抗扭转保护、高密度信号引脚、EMC屏蔽和板锁定等特性，确保信号完整性和连接的可靠性。产品适用于多种行业，包括工业自动化、医疗保健、测量和交通技术以及汽车电子。

EPT - 屏蔽式两排SMT连接器,高速连接器,HIGH-SPEED CONNECTOR,SHIELDED, TWO-ROW SMT CONNECTOR,401-51303-51,401-55501-51,401-55503-51,401-51703-51,401-55303-51,401-51403-51,402-51501-51,401-55301-51,401-51701-51,401-51401-51,401-55601-51,401-55104-51,401-51101-51,401-51103-51,401-55603-51,402-51301-51,401-55101-51,401-55401-51,401-55103-51,401-55701-51,402-51601-51,401-55403-51,XXX-XXXXX-XXVP1,401-55703-51,401-51501-51,401-51503-51,402-51101-51,401-51301-51,402-51701-51,401-51603-51,402-51401-51,401-51601-51,401-51104-51,INDUSTRIAL AUTOMATION,DATACOM,HEALTHCARE TECHNOLOGY,信息娱乐,测量,GAMING,医疗技术,销售点,工业自动化,MEASUREMENT,游戏,INFOTAINMENT,POINT OF SALE

2023/6/27 - 商品及供应商介绍代理服务技术支持采购服务

962-40326-03 PC/104母连接器，产品数据表

本资料为ept GmbH生产的PC/104型母座连接器产品数据表。该连接器具有64个触点，采用焊接端接技术，适用于PC/104性能等级2标准。其主要特性包括：接触电阻小于20毫欧姆，绝缘电阻大于10^6兆欧姆，操作电流最大1.9安培，操作电压150伏特，工作温度范围为-55°C至+125°C。

EPT - PC/104 FEMALE CONNECTORS,PC/104母连接器,962-40326-03

22.09.2023 - 数据手册代理服务技术支持采购服务查看更多版本

961-60NN2-12 Varpol母连接器单排，产品数据表

本资料为VarPol单排母座连接器（型号：961-60nn2-12）的技术规格说明书。该连接器采用压接式端子技术，适用于多种电路板材料，具有多种性能指标和电气参数。

EPT - VARPOL母头连接器,VARPOL FEMALE CONNECTOR,961-60NN2-12

02.02.2024 - 数据手册代理服务技术支持采购服务查看更多版本

962-40206-03 PC/104母连接器，产品数据表

本资料为ept GmbH生产的PC/104型female连接器产品数据表。该连接器具有40个触点，采用焊接端接技术，适用于高性能级2的PC/104接口。其规格包括最大操作电流1.9A、操作电压150V，接触电阻小于20mΩ，绝缘电阻大于106MΩ。材料方面，绝缘体为PBT玻璃填充，符合UL 94 V-0标准；接触材料为铜合金。此外，提供多种3D格式下载。

EPT - PC/104 FEMALE CONNECTORS,PC/104母连接器,962-40206-03

22.09.2023 - 数据手册代理服务技术支持采购服务查看更多版本

114-40060内螺纹接头H15客户图纸

EPT - FEMALE CONNECTOR,母座连接器,114-40060

18.03.2019 - 产品图纸 - Version 00 代理服务技术支持采购服务

961-60NN2-07 Varpol母连接器单排，产品数据表

本资料为VarPol单排母座连接器（型号：961-60nn2-07）的产品数据表。该连接器采用压接式终止技术，适用于多种电子设备，具有高性能水平、宽工作温度范围和良好的电气特性。

EPT - VARPOL母头连接器,VARPOL FEMALE CONNECTOR,961-60NN2-07

05.02.2024 - 数据手册代理服务技术支持采购服务查看更多版本

Zero8 Connectors Board-to-Board Distances from 6.00 mm to 21.00 mm, Able to Withstand at Least 500 Mating Cycles

The Zero8 product family from ept has been specially developed for demanding industrial applications and offers maximum scalability: You can adapt types, stack heights, and pin counts to suit your individual requirements. The socket and plug are currently available as mid-profile and low-profile types and will also be available as high-profile and angled versions in the future. Due to the different heights, Zero8 connectors can be used to achieve board-to-board distances from 6.00 mm to 21.00 mm – a variable number of pins (between 12 and 80) can be requested.But that’s not all.

2023-09-27 - 产品代理服务技术支持采购服务