Pcb Connector

Connector, also known as connector, plug and socket in China. Generally refers to electrical connectors. That is, the device connecting two active devices to transmit current or signal.

Connector is a kind of component that our electronic engineers and technicians often contact.

Its function is very simple:

build a communication bridge, between the blocked or isolated circuits in the circuit.

So as to make the current flow and realize the predetermined function of the circuit.

Connectors are indispensable components in electronic equipment.

Observe along the current flow path, and you will always find one or more connectors.

The forms and structures of connectors are ever-changing.

There are various forms of connectors with different application objects, frequencies, powers, application environments, etc.

For example, the connectors for lighting on the court, are very different from those for hard disk drives and rockets.

However, no matter what kind of connector, it is necessary to ensure the smooth, continuous and reliable flow of current.

In general, what the pcb connector connects is not limited to current.

Today, with the rapid development of optoelectronic technology.

The carrier of signal transmission in optical fiber system is light, glass and plastic instead of wires in ordinary circuits.

But connectors are also used in optical signal path.

Which have the same function as circuit connectors.

1.Use benefits

  • Improve the production process
  • Connectors simplify the assembly process of electronic products.
  • It also simplifies the batch production process;
  • Easy to maintain
  • If an electronic component fails, it can be quickly replaced when the connector is installed;
  • Easy to upgrade
  • With the progress of technology.The components can be updated when the connector is installed.And the new and more perfect components can replace the old ones;
  • Improve the flexibility of design.
  • The use of connectors enables engineers. To have greater flexibility in designing and integrating new products.As well as in composing systems with components.

 

Pcb Connector performance

The basic performance of connectors can be divided into three categories: mechanical performance, electrical performance and environmental performance.

1.Mechanical properties

Mechanical performance in terms of connection function, plugging force is an important mechanical performance.

The insertion force is divided into insertion force and pull-out force (pull-out force is also called separation force), and the requirements of the two are different.

There are provisions on the maximum insertion force and minimum separation force in the relevant standards, which shows that from the perspective of use, the insertion force is small (thus the structure with low insertion force LIF and no insertion force ZIF), and if the separation force is too small, it will affect the reliability of contact.

Another important mechanical property is the mechanical life of the pcb connector.

It takes one insertion and one pull-out as a cycle, and takes whether the connector can normally complete its connection function (such as contact resistance value) after the specified insertion and pull-out cycle as the evaluation basis.

The plugging force and mechanical life of the connector are related to the contact structure (positive pressure), the coating quality of the contact part (sliding friction coefficient) and the dimensional accuracy (alignment) of the contact arrangement.

 

2.Electrical performance

Electrical performance the main electrical properties of the connector include contact resistance, insulation resistance and electrical strength.

① Electrical connectors with high contact resistance should have low and stable contact resistance.

The contact resistance of the connector ranges from a few milliohms to tens of milliohms.

② Insulation resistance is an index to measure the insulation performance between the contacts of electrical connectors and between the contacts and the shell.

Its order of magnitude ranges from hundreds of megaohms to hundreds of gigaohms.

③ Electrical strength, or voltage withstand, dielectric withstand voltage, is the ability to withstand the rated test voltage between connector contacts or between contacts and housing.

3.Environmental performance

Environmental performance common environmental performance includes temperature resistance, humidity resistance, salt spray resistance, vibration and impact resistance.

Pcb Connector First

At present, the maximum working temperature of the connector is 200 ℃ (except for a few high-temperature special connectors), and the minimum temperature is -65 ℃.

When the connector works, the current generates heat at the contact point, resulting in temperature rise. Therefore, in general, we believe that the sum of ambient temperature and contact temperature rise should be equal to the working temperature.

In some specifications, the maximum allowable rise of the connector under the rated working current is clearly specified.

Second

The invasion of moisture resistance will affect the insulation performance of connection h and rust metal parts.

The constant damp heat test condition is 90% – 95% relative humidity (up to 98% according to the product specification), temperature +40 ± 20 ℃, and the test time is at least 96 hours according to the product specification.

The alternating damp heat test is more rigorous.

 

Pcb Connector Third

When the salt spray resistant  pcb connector works in the environment containing moisture and salt, the surface treatment layer of its metal structure and contact may produce electrochemical corrosion, affecting the physical and electrical properties of the connector.

In order to evaluate the ability of electrical connectors to withstand this environment, salt spray test is specified.

It is to hang the connector in a temperature controlled test box and spray the specified concentration of sodium chloride solution with compressed air to form a salt fog atmosphere.

The exposure time is specified by the product specification, which is at least 48 hours.

Pcb Connector Fourth

Vibration and shock resistance to vibration and shock is an important performance of electrical connectors, which is particularly important in special application environments such as aviation and aerospace, railway and highway transportation.

It is an important index to test the robustness of mechanical structure and electrical contact reliability of electrical connectors.

There are clear provisions in the relevant test methods.

The peak acceleration, duration and shock pulse waveform as well as the time of interruption of electrical continuity shall be specified in the impact test.

Pcb Connector Fifth

Other environmental properties according to the use requirements, other environmental properties of the electrical connector include tightness (air leakage, liquid pressure), liquid impregnation (anti habitation ability of specific liquid), low pressure, etc.

The “miniaturization”, “high-speed mobility” and intellectualization of pcb connector products are the trend of future development.