Foil-type precision resistor and manufacturing method thereof

Abstract

The invention discloses a foil-type precision resistor and a manufacturing method thereof. A resistance chip comprises a substrate, an adhesive layer and a resistance pattern; the resistance pattern is adhered to the substrate through the adhesive layer; the resistance pattern is made of a metal alloy foil material which is annealed by a vacuum annealing furnace or an atmosphere furnace at 400-600 DEG C for 3-6 hours; the adhesive layer is epoxy resin or phenolic aldehyde-epoxy resin filled with filler; the adhesive layer is formed on the substrate; the metal alloy foil and the substrate are firmly adhered together through the adhesive layer; then the metal alloy foil is adjusted to a nominal resistance value through chemical etching or laser etching by a mechanical or laser cutting method, so that a resistance grid is formed; a layer of a dampproof film is attached to the front surface of the resistance grid; a pin is welded to each of two welding points of the resistance grid and is led out of the substrate, so that the precision resistance chip is formed; a buffering layer wraps the precision resistance chip; the external part of the buffering layer is directly packaged to form a packaging shell.

Description

technical field [0001] The invention relates to a resistor and a manufacturing method thereof, in particular to a foil-type precision resistor and a manufacturing method thereof. Background technique [0002] As we all know, a resistor, as a passive device, is an indispensable basic component in circuit design. One of the main factors affecting circuit performance is the quality of the resistor. The quality of ordinary resistors, especially the resistance value of resistors, changes with the ambient temperature and humidity, and also changes with the self-heating of the current flowing through the resistor. These factors bring stability and reliability to the circuit. come to have a big impact. In order to eliminate or reduce these effects, circuit design puts forward higher requirements on the quality of resistors. [0003] At present, the types of precision resistors include wirewound resistors, metal film resistors and thick film resistors. [0004] Wire-wound resisto...

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Problems solved by technology

[0008] In order to overcome the shortcomings of ordinary resistors such as large temperature coefficient of resistance and poor load stability, the present invention provides a foil-type precision resistor with low temperature coefficient of resistance and high stability and its manufacturing method

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