Vishay Siliconix electrical components German Vishay Siliconix models Vishay Siliconix prices

Vishay Siliconix electrical components are indispensable measuring instruments for departments such as power electronics, generally with the main purpose of measuring voltage, current, and resistance. Multimeters are divided into analog multimeters and digital multimeters according to the display method. It is a multi-function, multi-range measuring instrument. General multimeters can measure DC current, DC voltage, AC current, AC voltage, resistance, and audio levels, etc. Some can also measure AC current, capacitance, inductance, and some parameters of semiconductors (such as β), etc. A multimeter is a magnetoelectric instrument equipped with a rectifier that can measure various electrical parameters such as AC/DC current, voltage, and resistance. For each electrical quantity, there are generally several ranges. Also known as a multi-meter or simply multitester. A multimeter consists of a magnetoelectric ammeter (meter head), measuring circuit, and selector switch, etc. Through the switching of the selector switch, various electrical parameters can be measured conveniently. The main basis for its circuit calculation is Ohm's law for closed circuits. There are many types of multimeters, and they should be selected according to different requirements during use.

Vishay Siliconix electrical component types

In different application scenarios, the purpose of applying varistors, and the voltage/current acting on the varistor, are not the same, so the requirements for varistors are also different. Paying attention to distinguishing these differences is very important for correct use. According to different purposes, varistors can be divided into two categories: (1) protection varistors and (2) circuit function varistors. Protection resistors: (1) Distinguish whether it is a varistor for power supply protection or a varistor for signal line and data line protection; they must meet the requirements of different technical standards. (2) According to the different continuous operating voltages applied to the varistor, varistors across power lines can be divided into two types: AC type and DC type. The aging characteristics of varistors under these two voltage stresses are different. (3) According to the different abnormal overvoltage characteristics withstand by the varistor, varistors can be divided into three types: surge suppression type, high-power type, and high-energy type. 1. Surge suppression type varistor refers to a varistor used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage. The occurrence of this transient overvoltage is random and non-periodic, and the peak current and voltage may be very large. The vast majority of varistors belong to this category. 2. High-power type varistor refers to a varistor used to absorb continuous pulse groups that appear periodically, such as varistors connected in parallel to switching power supply converters. Here, the impulse voltage appears periodically, and the period is known. The energy value can generally be calculated. The peak voltage is not large, but due to the high frequency of occurrence, its average power is quite large. 13. High-energy type varistor refers to a varistor used to absorb magnetic energy in large inductive coils such as generator excitation coils and lifting electromagnet coils. For such applications, the main technical indicator is energy absorption capacity. The protective function of varistors can be repeated many times in most application scenarios, but sometimes they are made into "one-time" protective devices like current fuses. For example, varistors with short-circuit contacts connected in parallel to the loads of certain current transformers.

Vishay Siliconix electrical component classification

Printed circuit boards are divided into three major categories according to the number of layers: single-sided boards, double-sided boards, and multi-layer boards. First is the single-sided board. On the most basic PCB, components are concentrated on one side, and traces are concentrated on the other side. Because traces appear only on one side, this kind of PCB is called a single-sided printed circuit board. Single-sided boards are usually simple to manufacture and low in cost, but the disadvantage is that they cannot be applied to too complex products. Double-sided boards are an extension of single-sided boards. When single-layer wiring cannot meet the needs of electronic products, double-sided boards must be used. Both sides have copper cladding and traces, and vias can be used to conduct circuits between the two layers, forming the required network connections. Multi-layer boards refer to printed boards formed by laminating more than three layers of conductive graphic layers with insulating materials in between, and the conductive graphics in between are interconnected as required. Multi-layer printed circuit boards are the product of the development of electronic information technology towards high speed, multi-function, large capacity, small volume, thin profile, and light weight. Printed circuit boards are divided into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB) according to their characteristics.

Vishay Siliconix electrical component classification

Thermosensitive materials are generally divided into three categories: semiconductor, metal, and alloy: 1. Semiconductor thermistor materials include single-crystal semiconductors, polycrystalline semiconductors, glass semiconductors, organic semiconductors, and metal oxides, etc. They all have very large resistance temperature coefficients and high resistivity, and sensors made from them have relatively high sensitivity. According to the resistance temperature coefficient, they can also be divided into negative temperature coefficient materials and positive temperature coefficient materials. For example, barium titanate ceramic is an ideal positive temperature coefficient semiconductor material. The above two types of materials are widely used in temperature measurement, temperature control, temperature compensation, switching circuits, overload protection, and time delay, such as being used to make thermistor thermometers, thermistor switches, and thermistor delay relays, etc. Since the resistance and temperature of these materials exhibit an exponential relationship, the temperature measurement range is narrow and the uniformity is poor. 2. Metal thermistor materials are widely used as thermal resistors for temperature measurement, current limiters, and automatic constant temperature heating elements. Examples include platinum resistance thermometers, nickel resistance thermometers, and copper resistance thermometers. Among them, platinum temperature sensors exhibit obvious high precision and high stability characteristics in various media (including corrosive media). However, due to the scarcity and high price of platinum, their wide application is limited to some extent. Copper temperature sensors are cheaper, but long-term use in corrosive media can lead to significant changes in static characteristics and resistance values. Nickel temperature sensors are widely used abroad and are considered a relatively ideal material because they have high sensitivity, satisfactory reproducibility, and stability. 3. Alloy thermistor materials, also known as thermistor alloys. This alloy has relatively high resistivity, and its resistance value is relatively sensitive to temperature changes, making it a good material for manufacturing temperature-sensitive sensors. The performance requirements for thermistor alloys as temperature-sensitive sensors are as follows: (1) Sufficiently large resistivity; (2) Relatively high resistance temperature coefficient; (3) Coefficient of linear expansion close to that of the experimental material; (4) Small strain sensitivity coefficient; (6) Good repeatability of the resistance-temperature curve when heating and cooling within the operating temperature range.

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