Wirewound Resistors
Wirewound resistors are wound from wire or tape with high resistivity onto any frame. Usually used only in DC circuits have significant stray inductance. To reduce stray inductance, they are almost always performed with bifilar winding. High-resistance small-sized wire resistors are sometimes made from microwires. Wirewound resistors are used in resistance shops , where they achieve the selection of the number of turns very high precision resistance values.
Wireless resistors
The resistive element in such resistors is a three-dimensional structure of a physical body or surface layer, formed on insulating parts (a thin film of a metal alloy or composite material with high resistivity, low coefficient of thermal resistance, usually deposited on a ceramic core in the form of a cylinder). The ends of the core are equipped with pressed-in metal caps with wire leads for mounting. Sometimes, to increase the resistance, a helical groove is formed in the film to form a spiral configuration of the conductive layer. Now it is the most common type of resistor for mounting in the holes of printed circuit boards. The resistors are made in the same way. as a part of a hybrid integrated circuit: in the form of metal or composite films deposited on a usually ceramic substrate vacuum spraying or screen printing.
The following materials are used in non-wire resistors:
Carbon Resistors
In carbon resistors, the conductive layer is a pyrolytic carbon film. These resistors have high parameter stability, a small negative temperature coefficient of resistance (TCR), they are resistant to impulse loads.
Borocarbon resistors are distinguished by the fact that they contain a small addition of boron in the conductive layer, which allows to reduce the TCS.
Metal film and metal oxide resistors
A thin metal tape is used as the resistive material.
Composition resistors
Made in the form of film and volume. Films or resistive bodies are graphite mixtures with organic or inorganic substances.
Integrated Resistors
A resistive element is a lightly doped semiconductor formed in a chip chip in the form of a usually zigzag channel, isolated from other circuits of the pn circuit by a junction. Such resistors have a large non-linearity of the current-voltage characteristics. They are mainly used as part of single-crystal integrated circuits, where it is fundamentally impossible to use other types of resistors.