German SICOD plug SICOD model SICOD price

SICOD plugs are conductive devices that bridge two conductors in a circuit, allowing current or signals to flow from one conductor to another. They are widely used in various electrical circuits to connect or disconnect current or signals. This connection may be temporary and convenient for plugging and unplugging at any time, or it may be a permanent node between electrical equipment or wires. Electronic connectors are devices that transmit electronic signals (analog or digital signals), providing a separable interface to connect two sub-electronic systems, and are components used to complete electrical connections between circuits or electronic machines. Examples include power plugs/sockets, IC sockets, telephone line plugs, etc. They are widely used in the electronics industry. An electronic connector is an electromechanical system that provides a separable interface to connect two sub-electronic systems; simply put, components used to complete electrical connections between circuits or electronic machines are called connectors, acting as a bridge between them. Electronics can serve as electrical/electronic transmission and connection components between circuits, components, and systems, enabling stable and reliable flow of power, signals, and current, while facilitating product assembly, maintenance, and replacement.

SICOD plug structure

Electrical connectors consist of fixed-end electrical connectors, i.e., female contacts (referred to as sockets), and free-end electrical connectors, i.e., male contacts (referred to as plugs). The socket is fixed to the powered component via its square (round) flange (some also use welding methods), while the plug is generally connected to a cable, achieving the plug-socket connection through a coupling nut. Electrical connectors are composed of three basic units: housing, insulator, and contact body. 1) Housing: The electrical connector housing refers to the outer shell of the plug and socket, the coupling nut, and the rear accessory. The function of the outer shell is to protect internal parts of the electrical connector, such as the insulator and contact bodies (collectively referred to as pins and sockets), from damage. The positioning key slots on top ensure proper alignment of the plug and socket. The coupling nut is used for connecting and separating the plug and socket. The rear accessory protects the wire termination area from damage and secures the cable. The housing also provides a certain degree of electromagnetic shielding. Housings are generally machined from aluminum alloy (machining, cold extrusion, die casting). Steel housings are mostly used for glass-sealed and high-temperature resistant electrical connectors. 2) Insulator: Composed of pin-mounting insulators, socket-mounting insulators, interface seals, and wire seals. It is used to keep pins and sockets in their designated positions and to provide electrical insulation between individual contact bodies and between contact bodies and the housing. Sealing measures are achieved by adding interface seals and wire seals to the insulator to improve the environmental resistance of the electrical connector. To adapt to high temperature, low temperature, and flame retardancy requirements, and to ensure stable and reliable geometric dimensions of parts, insulators are mostly molded from thermosetting plastics. Interface seals and wire seals are formed by molding silicone rubber, etc. 3) Contact body: Contact bodies include male and female contacts, sometimes referred to as pins and sockets. Connection methods include soldering, crimping, press-fit, and wire wrapping, used to achieve circuit connections. Pins and sockets are key components of electrical connectors, directly affecting their reliability. Pins and sockets are mostly machined from elastic copper alloys with good conductivity, and surfaces are silver- or gold-plated to achieve low contact resistance and corrosion resistance. Sockets generally include split-type sockets, wire spring sockets, crown spring sockets, and stamped sockets. Structural features include: environmental resistance, bayonet (quick) connection, multi-key positioning (anti-misinsertion), crimped connection between contact bodies and wires (single-wire removal facilitates fault handling). The housing plus shielding ring ensures 360° electromagnetic interference shielding capability.

SICOD plug material

Material selection is based on a comprehensive consideration of processability, product applicability, and strength properties; the cost of electronic connectors varies depending on material prices, processing difficulty, and production efficiency; electronic connector materials mainly include insulator materials (plastic raw materials) and conductor materials (phosphor bronze, brass); common engineering plastics for electronic connectors include: LCP, NYLON, PBT. 1) LCP: Features a low coefficient of linear expansion, low injection molding shrinkage, outstanding strength and elastic modulus, and excellent heat resistance, with a high load deformation temperature, some exceeding 340 degrees. LCP also has excellent chemical resistance and air tightness, so it is the preferred material for general connectors, especially those requiring SMT, eg:MINI PCI EXPRESS; DDR. 2) NYLON: Lower cost, very high tensile strength, outstanding wear resistance and self-lubricity, good fluidity, beneficial for thin-wall molding, but significant shrinkage, prone to burrs, requires strict baking before molding to prevent hydrolysis. General connectors, especially DIP, mostly use NYLON material, eg:PCI 120P; PCI EXPRESS. 3) PBT: Plug-in electronic connectors, low cost, high strength, wear-resistant, but poor moldability, significant shrinkage. Due to the lower melting temperature, plastic melting phenomena may occur during wave soldering.

SICOD plug safety parameters

1) Insulation resistance: Insulation resistance refers to the resistance value presented by leakage current generated on or within the surface of the insulating part when voltage is applied to the insulating part of the connector. It is mainly affected by factors such as insulating material, temperature, humidity, and contamination. The insulation resistance values provided in connector catalogs are generally indicators under standard atmospheric conditions; under certain environmental conditions, insulation resistance values will decrease to varying degrees. Also note the test voltage value for insulation resistance. According to insulation resistance (MΩ) = voltage applied to the insulator (V) / leakage current (μA), applying different voltages yields different results. In connector tests, the applied voltages generally have three levels: 10V, 100V, 500V. 2) Rated voltage: Dielectric strength is the critical voltage that the mutually insulated parts of a contact pair, or between insulated parts and ground, can withstand for a specified time without breakdown, which is higher than the rated voltage. It is mainly affected by contact pair spacing, creepage distance, geometric shape, insulator material, as well as environmental temperature, humidity, and atmospheric pressure. 3) Mechanical life: The mechanical life of a connector refers to its mating cycle life, typically specified as 500 to 1000 cycles. When this specified mechanical life is reached, indicators such as contact resistance, insulation resistance, and dielectric strength of the connector should not exceed specified values. Strictly speaking, mechanical life is related to time; using 500 cycles over 10 years versus using 500 cycles over 1 years obviously results in different conditions. First, select the number of contact pairs according to circuit needs, while considering the connector's volume and total separation force. A larger number of contact pairs naturally results in a larger volume and relatively greater total separation force. In cases with high reliability requirements and permissible volume, two contact pairs can be connected in parallel to improve connection reliability. In connector plugs and sockets, pins (male contacts) and sockets (female contacts) are generally interchangeable. In actual use, selection can be made based on the live status at both ends of the plug and socket. For example, if the socket needs to remain live, choose a socket with female contacts, because the live contacts are embedded in the insulator, making them less accessible to human touch, which is relatively safer. Mainly consider the electrical continuity of contact pairs under vibration, shock, and collision at specified frequencies and accelerations. Contact pairs may experience instantaneous open circuits under such dynamic stress. Specified instantaneous interruption times generally include 1μs, 10μs, 100μs, 1ms, and 10ms. Note how to judge instantaneous interruption faults in contact pairs. Currently, it is considered that a fault in a closed contact pair (contact) is determined when the voltage drop across its ends exceeds 50% of the power source electromotive force. That is, there are two conditions for judging instantaneous interruption: duration and voltage drop, both of which are indispensable. Connectors generally consist of plugs and sockets, where the plug is also called a free-end connector, and the socket is also called a fixed connector. Circuit connection and disconnection are achieved through the mating and separation of plugs and sockets, resulting in various connection methods for plugs and sockets. For circular connectors, the main methods are threaded connection, bayonet connection, and push-pull (ball-lock) connection. Among these, threaded connection is the most common, offering advantages such as simple processing, low manufacturing cost, and wide applicability, but slower connection speed, making it unsuitable for frequent mating/unmating and quick connections. Bayonet connection has a faster connection speed due to the longer lead of its three bayonet slots, but it is more complex to manufacture and has a higher cost. Push-pull (ball-lock) connection is the fastest among the three methods; it does not require rotational motion, only linear motion to achieve connection, separation, and locking. As it belongs to the straight push-pull connection method, it is only suitable for connectors with low total separation force. It is generally more common in small connectors.

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