German SICK plug, SICK model, SICK price

SICK plugs are conductive devices that bridge two conductors in a circuit, allowing current or signals to flow from one conductor to another. An electronic connector is an electromechanical system that provides a separable interface for connecting two subsystems. Simply put, components used to complete electrical connections between circuits or electronic devices are called connectors, acting as a bridge between them. In addition to meeting general performance requirements, it is particularly important that electrical connectors achieve good contact, reliable operation, and easy maintenance. Their operational reliability directly affects the normal operation of aircraft circuits and involves the safety of the entire host system. For this reason, host circuits have very strict requirements for the quality and reliability of electrical connectors. It is precisely because of the high quality and high reliability of electrical connectors that they are also widely used in military systems such as aviation, aerospace, and national defense. Common classification methods for electrical connectors include shape, structure, and application.

SICK plug features

1) Developing towards miniaturization, high density, and high-speed transmission; 2) Developing towards high performance and high-frequency technology; 3) There is also a large market demand for high-voltage and high-current connectors; 4) Connectors are also developing towards anti-interference technology, modular technology, and lead-free technology. As the rate of traditional parallel synchronous digital signals approaches its limit, high-speed serial transmission is a good solution. This makes Low-Voltage Differential Signaling (LVDS) the main electrical level standard for next-generation high-speed signals. The selection of high-speed connectors has become a major issue to be resolved for high-rate signal interconnection. Several key technologies adopted in the development of high-speed connectors include: 1) Differential signaling, noise-free signaling, and ground plane technologies used to reduce crosstalk; 2) Adjusting connector leads to compensate for delay differences caused by unequal physical distances between connector inputs and outputs; 3) To achieve maximum transmission efficiency, the characteristic impedance of the connector should match the characteristic impedance of the transmission circuit.

SICK plug classification

1) By shape: circular electrical connectors and rectangular electrical connectors. Circular electrical connectors are used most extensively in military equipment (aviation, aerospace) due to their structural characteristics. Rectangular electrical connectors are more commonly used on printed circuit boards of electronic devices due to their simple structure. 2) By structure: By connection method: threaded connection, bayonet (quick) connection, latch connection, push-pull connection, direct plug-in connection, etc.; By contact termination form: crimping, soldering, wire wrapping; screw (cap) fixation; By environmental protection: environmentally resistant electrical connectors and standard electrical connectors. 3) By application: RF electrical connectors, sealed electrical connectors (glass-to-metal seal), high-temperature electrical connectors, automatic disconnect electrical connectors, filter electrical connectors, composite material electrical connectors, airport power electrical connectors, printed circuit board electrical connectors, etc.

SICK plug main parameters

1) Rated voltage: Also known as operating voltage, it mainly depends on the insulation material used in the connector and the spacing between contact pairs. Certain components or devices may not perform their intended function when operated below their rated voltage. The rated voltage of a connector should effectively be understood as the maximum operating voltage recommended by the manufacturer. In principle, connectors can operate normally at voltages below the rated voltage. The author tends to select the rated voltage reasonably based on the connector's withstand voltage (dielectric strength) specifications, according to the usage environment and safety level requirements. That is to say, with the same withstand voltage specification, different maximum operating voltages can be applied depending on the usage environment and safety requirements. This aligns better with objective usage conditions. 2) Rated current: Also known as operating current. Like rated voltage, connectors generally operate normally at currents below the rated current. In the connector design process, thermal design is used to meet rated current requirements, because when current flows through contact pairs, heat is generated due to conductor resistance and contact resistance. When heating exceeds a certain limit, it will damage the connector's insulation and cause softening of the contact pair surface plating, leading to failure. Therefore, limiting the rated current effectively means limiting the internal temperature rise of the connector to not exceed the design specified value. A point to note during selection is: for multi-core connectors, the rated current must be derated. This deserves more attention in high-current applications. For example, for φ3.5mm contact pairs, the rated current is generally specified as 50A, but for 5 cores, it must be derated by 33%, meaning the rated current per core is only 38A. The greater the number of cores, the larger the derating factor. 3) Contact resistance: Contact resistance refers to the resistance generated at the contact interface between two conductive contacts. Two issues should be noted during selection. First, the connector's contact resistance specification is effectively the contact pair resistance, which includes contact resistance and contact pair conductor resistance. Since conductor resistance is usually small, contact pair resistance is often referred to as contact resistance in many technical specifications. Second, in circuits carrying small signals, pay attention to the conditions under which the given contact resistance specification was tested, because oxide layers, oil stains, or other contaminants on the contact surface can generate film resistance. As film thickness increases, resistance rises rapidly, making the film a poor conductor. However, the film layer can undergo mechanical breakdown under high contact pressure, or electrical breakdown under high voltage and high current. For some small-volume connectors, the designed contact pressure is quite low, and the application level is only mA and mV level, so the film resistance is not easily broken down, which may affect signal transmission. One of the contact resistance test methods in GB5095 "Basic Test Procedures and Measurement Methods for Electromechanical Components Used in Electrical Equipment," specifically the "Contact Resistance - Millivolt Method," stipulates that to prevent breakdown of the insulating film on the contacts, the DC or AC peak open-circuit electromotive force of the test circuit shall not exceed 20mV, and the DC or AC test current shall not exceed 100mA. 4) Shielding: In modern electrical and electronic equipment, the increasing density of components and their related functions imposes strict limits on electromagnetic interference. Therefore, connectors are often enclosed in metal shells to prevent internal electromagnetic radiation or interference from external electromagnetic fields. At low frequencies, only magnetic materials provide significant shielding against magnetic fields. In this case, there are certain requirements for the electrical continuity of the metal shell, which refers to the shell contact resistance.

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