Tungsten is a superior material for fabricating needle. And tungsten needle is the most important semiconductor test probe. Tungsten probes are mainly used in the final testing stage of processes of semiconductors. And the tungsten probe used to connect the chip to the test board is an important factor that affects contact and electrical characteristics of dies. Generally speaking, the tungsten needle as a probe is to identify good and bad dies, thereby reducing unnecessary packaging cost.
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Tungsten needle with a sharp tip is usually mounted on a probe card or a prober. This is to prevent tungsten probe from damaging the chip electrode itself when in contact with the chip. Semiconductor test probes require materials with high purity and high precision. Therefore, tungsten probes are usually made of high-purity tungsten with a tip. And its surface is smooth with no burrs. The finish can reach Ra0.25 or more.
