Hall chip magnetic flux test device

Abstract

The invention relates to a Hall chip magnetic flux test device (1) for use in a SOT23 encapsulation test sorter, which is characterized in that the device (1) comprises a test support (9), a test seat (2) fixed on the upper end of the test support (9), a test clamp (3) which is arranged in the test seat (2) for holding a tested Hall chip, a plurality of gold fingers (5) electrically connected with the test clamp (3), a cover plate (6) positioned above the gold fingers (5) and a coil (4) wound on the test support (9), wherein the gold fingers (5) are fixed between the cover plate (6) and the test seat (2). The device can test the magnetic flux of the Hall chip in a SOT23 encapsulation test.

Description

technical field [0001] The invention relates to a Hall chip magnetic flux testing device, which is used for testing the magnetic flux of mass-produced Hall chips during SOT23 package testing. Background technique [0002] The Hall effect is a kind of magnetoelectric effect. When the current passes through the conductor in the magnetic field in the direction perpendicular to the external magnetic field, a potential difference will appear between the two end faces of the conductor perpendicular to the direction of the magnetic field and the current. The phenomenon is called the Hall effect. The Hall sensor is a sensor that uses the Hall element to convert the measured physical quantity (such as current, magnetic field, displacement, pressure, etc.) into an electromotive force output based on the Hall effect principle. It has the advantages of simple structure, small size, no contact, high reliability and easy miniaturization, so it has been widely used in measurement technolo...

AI Technical Summary

Problems solved by technology

In the SOT23 package test, because the traditional SOT23 package test sorter does not install a magnetic field, it is impossible to test the magnetic flux of the Hall chip

And the test head and suction nozzle part of the traditional SOT23 packaging test sorting machine are made of magnetic materials, so even if a magnetic field is applied to the Hall chip in the SOT23 packaging test for magnetic flux testing, the aforementioned magnetic materials used It will be permanently magnetized after magnetization, resulting in remanence when no external magnetic field is generated, which will cause test deviation and misjudgment

Images