A semiconductor is a material which has electrical conductivity to a degree between that of a metal (such as copper) and that of an insulator (such as glass). Semiconductors are the foundation of modern electronics, including transistors, solar cells, light-emitting diodes (LEDs), quantum dots and digital and analog integrated circuits.
If you are doing any type of repair work on electronic equipment, there is going to come a time when you need to replace a component that is seemingly obsolete. To make matters worse, you only need one component to repair the equipment and are not sure where to turn. For many engineers, it is time to throw out the older piece of equipment no matter how useful it is. For the hobbyist, it may be time to scavenge the electronic device to salvage components for future projects; however, there is an alternative that needs to be taken advantage of.
There are several electronic manufacturers that build obsolete electronic components.
These components are only considered to be obsolete to design engineers that no longer are using an older version of an electronic component or simply not using the technology of the component. Many of these components are still needed for repair and that is why they are still made. Unfortunately, it is difficult to find the manufacturers of these components. They may be manufactured in any number of countries, and even if you could find the company you are looking for, they would most likely require a large minimum order.
The solution to find obsolete semiconductors and passive components is to use an online distributor that specializes in this type of hard-to-find electronic component. Odyssey Electronics is a very good example of this type of distributor. You can search for the exact part you are looking for at their site and only order the number of parts you need.