ACCEL INDUSTRIAL LIMITED

Thousands of tiny transistors, diodes, resistors and capacitors are fabricated on a semiconductor wafer forms integrated circuit.there are two types of ic, CMOS ic and digital ic. MOSFETs come in four different types. They may be enhancement or depletion mode, and they may be n-channel or p-channel.There are also logic-level MOSFETs and normal MOSFETs.

IC and mosfet tips

1.what is IC?
IC is the abbreviation for Integrated Circuit. Integrated Circuit is a circuit in which several discrete components, such as transistors, resistors, and capacitors are combined as a single device, called chip and microchip as well. An IC can function as an amplifier, oscillator, timer, counter, computer memory, or microprocessor. However, a particular IC is categorized as either linear (analog) or digital, depending on its intended application.

2.What is Mosfet?
We call metal-oxide semiconductor field-effect transistor mosfet, It is a voltage controlled power device or transistor that is capable of handling large electrical current flow, they separated conductive electrode from the semiconductor surface by way of an insulating layer, typically silicon dioxide. Varying the voltage on the conductive electrode controls the flow of current along the semiconductor surface. They are composed of a channel of n-type or p-type semiconductor material, and is accordingly called an NMOSFET or a PMOSFET. ... MOSFETs have a significantly higher switching speed than bipolar transistors. They generate almost no loss (little heat generation), which lends the power supply fast response, excellent linearity, and high efficiency.

3.What is transistor?
Transistor is an active solid-state semiconductor device with three or more electrodes and capable of amplification, rectification, and switching. Important features are low power, small size, and long life. Two main types are bipolar and field effect. They have two key properties: 1) they can amplify an electrical signal and 2) they can switch on and off, letting current through or blocking it as necessary

4.Part classification in the market.
A.original package, parts that are from original factory. Normal Defective percentage is around five thousandth..
B.New and unused, bulk. Low quality parts which are from the original factory. These parts are not sold to the market under the name of the original factory. The defective percentage could not over pass twenty percent.
C.Substitutes, Parts that are not the brand customers required, they have the same function and can be used. Normal Defective percentage is around five thousandth as well.
D.Used parts. Parts which are pulled out from the board and are re-soldered. The quality of these parts depends on the soldering quality.

5.How to distinguish different grades of parts.
A.If you wanna buy original package parts, you can buy the parts from the local agents.
B.By appearance, firstly, The label of the original sealed parts are different from others. The content of the right label should be stamped on it, while the content of forged label is printed. Second, the mark on the parts differs. By way of a magnifying glass we can find that the surface of the chip is smooth and lustrous, the character should be arranged regularly. However, the best way should be testing, following the progress of the technology, trick of the fraud is being improved, our traditional method are not afford to unmask them. We need to test all parts we buy from the market, this is the best way to ensure the quality.

6.How to make your RFQ more efficient?
Sending RFQ is exactly a kind of communication. Buyers should let the sellers know the completed information about the products. As for IC and Mosfet, buyer should show sellers the unabridged Part number (including the prefix and suffix, these factors imply some information about package, pin, dimensions), manufacturer and quantity, sometimes you can even provide the target price if it's available.