The composition and selection of chip resistors

The composition and selection of chip resistors

Resistors are two-terminal electronic components made of resistive materials, with a certain structure, and capable of limiting the flow of current in the circuit. The resistance that cannot be changed is called a fixed resistor. Variable resistance is called variable resistor. The ideal resistor is linear, that is, the instantaneous current through the resistor is proportional to the applied instantaneous voltage. Resistors are the most widely used components in electronic circuits, usually in different series according to power and resistance, for circuit designers to choose. Resistors are mainly used in circuits to adjust and stabilize current and voltage, and can be used as shunts and voltage dividers, and can also be used as circuit matching loads. According to circuit requirements, it can also be used for negative feedback or positive feedback of amplifying circuit, voltage-current conversion, voltage or current protection element when input is overloaded, and can be formed into RC circuit for oscillation, filtering, bypass, differentiation, integration and time constant Components, etc.

Three basic principles for resistor selection:

Choose resistors that are manufactured on a production line certified by a certification body that implement high-level standards.

Choose resistors produced by manufacturers with functional advantages, quality advantages, efficiency advantages, functional price ratio advantages, and service advantages.

Select the manufacturer of the above model catalog that can meet the above requirements, and order resistors directly from them.

The resistance should be checked before use. To check its performance is to measure whether the actual resistance value is consistent with the nominal value and whether the error is within the allowable range.

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