New-Tech Europe Magazine | Q3 2020

to make a permanent and reliable contact with each individual pin and also the connector shell. For a better understanding of how the technology works, we’ll take a look at Figure 1, a cross section of a mated pair of D38999 connectors. The blue portion that you see is an EESeal. Embedded in the silicone rubber is the 0402 and 0603 chip-device discussed earlier. Additionally, depending on the application, any of the following could also be included in the silicone rubber insert: Capacitor resistors Transient Voltage Suppressors (TVS) Multilayer Varistors (MLV) Any 0402/0603 or even some 0805 components can also be used depending on the connector size Dual contacts are soldered on one end of the device that protrude into the hole. There are dual contacts on the backend that simulate a ground bus or, a spider web of a ground plane that will ground the shell contact or the receptacle, depending on the contact types or the connector’s needs. This system helps to build in a certain amount of redundancy into each EESeal where there are always 2 or more paths to GND. All wires within the component are 3 mill, copper annealed, gold plated wires, making them more resilient than spring contacts. As you can also see in Figure 1, when a connection is made, the insert will take on the properties of the interfacial seal inside the connector, and in doing so it fills all the voids, nooks and crannies, maintaining the integrity of the interfacial seal itself. In Figure 2, you’ll notice that every device within the EESeal is discrete. The 0402 and 0603 type-devices are intentionally discrete, so every pin can be treated differently as needed in each application. As an example, because of this design you can have pins with unique attributes, for example: Pins 1-4 = 47 nanofarads

EMI filtering RFI filtering Transient protection for indirect lig htning Transient protection for ESD The ability to add pull up resistors The ability to add grounding Redistribution of power Because of its resistance to the effects of extreme environments, the EESeal

Pins 12-15 = 220 picofarads Remaining pins = no capacitor fitted Devices can also be designed in parallel or series, potentially allowing several chip devices to protect each pin, giving greater design flexibility Multitude of Uses Filter inserts can help overcome many challenges by providing:

Figure 1

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