Everything you need to know about RoHS testing

May 2018

To have a healthy lifestyle it is important to use products which contain less or no hazardous substances. Governments have issued a lot of regulations and directions to reduce the toxic materials and metals. RoHS testing is one of the testings used to check the percentage of the hazardous substances. RoHS (Restriction on Hazardous Substances)  was first applied in the European Union. The United States of America restricts the use of specific hazardous materials found in electrical and electronic products.

In the RoHS testing, tests are generally done to notice the level of the Cadmium, Lead, Mercury, and hexavalent chromium. It is also used to find if total bromine is less than the prescribed limit for the most bromine-rich compound.

What are the main restricted substances?
RoHS is usually referred to as the lead-free regulations, but importantly, following are some of the substances that are restricted under this.

• Hexavalent chromium (Cr6+)
• Dibutyl phthalate (DBP)
• Polybrominated biphenyls (PBB)
• Mercury (Hg)Butyl benzyl phthalate (BBP)
• Cadmium (Cd)
• Diisobutyl phthalate (DIBP)
• Polybrominated diphenyl ether (PBDE)
• Lead (Pb)
• Bis(2-ethylhexyl) phthalate (DEHP)

What are the product components that contain restricted substances?
There is a huge variety of components that customer uses in their daily life. Electronic and electrical products are one of them. Below are some of the examples of the components that include a Lead element in excess.

• The printed circuit board (PCB), leads, internal and external interconnects
• Lamps and bulbs
• Batteries
• Photographic products, for example- CRT television screens and camera lenses.
• Paints and pigments
• Soldering equipment
• Metal parts
• Integrated circuits (ICs) or microchips
• PVC (vinyl) cables as a stabilizer (e.g., power cords, USB cables)

What is the need for RoHS testing?
Many a times it is seen that the components have more or irregular composition which is not safe for health and also shows its effects on the environment adversely. To check the accuracy regarding the composition of the different things in a specific material, this testing is used. In some reputed places, it is important to identify and marked as RoHS certified to ensure the quality of the product. To know more, contact- Resion.

Semiconductors- Types and Classification

May 2018

Have you heard about semiconductors? They are tiny electronic components commonly known as microchips and computer chips. They are also known as integrated circuits. These electronic components are mostly found in the smartphones, games, PCs, and electronic devices. The advancement in the technology has lead to the boom in the electronics industry and so in the semiconductor industry.

Purpose of a Semiconductor- A semiconductor helps in the movement of electricity. A semiconductor is used for the controlled movement of electrons from one component to another component.
As the name indicates, semiconductors are made up of materials which are neither good insulators nor good conductors. Such devices are used for wide range of applications due to the fact of its reliability, compactness, and inexpensive option. These electronic components are widely used in various sectors such as- light emitters, power devices, current and voltage handling capabilities, compactness optical sensors. In addition to this, they are used to manufacture microelectronic circuits. It is important to mention here that semiconductors are the key elements of the electronic components.

Different type of semiconductors- There are two basic groups or classifications that can be used to define the different semiconductor types. They are-

• Intrinsic material- The intrinsic type of semiconductor is made up of pure material. This is the reason that they possess a very low conductivity level. 

• Extrinsic material- Extrinsic types of the semiconductor are made up of material with some impurities.

N-type- The N-type semiconductor includes surplus electrons. This is the reason there are so many free electrons available within the structures. They move in one direction under the influence of a potential difference which results in an electric current flow. In an N-type semiconductor, electrons are the charge carriers.

P-type- In a P-type semiconductor there is a deficiency of electrons that means there are 'holes' in the crystal lattice. P-type electrons move from one empty place to the filled place which is considered as hole. It is important to mention here that the electrons carry the negative charge and holes carry the positive charge.

Looking for the electronic component suppliers? Contact- Resion. They are the leading suppliers of different electronic elements. They are well-known dealers of MIL-PRF-19500P.