Electronic materials, also known as electronic components, electronic components is a general term for components and devices.
A, components: the factory did not change the molecular composition of the product in the processing of products products can be referred to as components, do not need to be able to & lt; electricity & gt; source of the device.
It includes: resistors, capacitors, inductors. (Also known as Passive ComponentsPassive Components)
(1) circuit devices: diodes, resistors, etc.
(2) connectivity devices: connectors, sockets, connecting cables, printed circuit boards (PCBs)
Two, devices: the factory in the production of the molecular structure of the device is known as the device
Devices. >Devices are divided into:
1. Active devices, its main features are: (1) its own consumption of electrical energy (2). It also requires an external power source.
2. Discrete devices, divided into (1) bipolar crystal transistor (2) field effect transistor (3) silicon controlled (4) semiconductor resistor-capacitor
3. Analog integrated circuits mainly refers to analog circuits consisting of capacitors, resistors, transistors and other analog circuits are integrated together used to process analog signals integrated circuits. There are many analog integrated circuits, such as integrated operational amplifiers, comparators, logarithmic and exponential amplifiers, analog multipliers (divisors), phase-locked loops, power management chips and so on. The main constituent circuits of analog integrated circuits are: amplifiers, filters, feedback circuits, reference source circuits, switched-capacitor circuits, and so on. Analog integrated circuit design is mainly through experienced designers to manually debug the circuit, simulation and get, and this corresponds to the design of digital integrated circuits is mostly through the use of hardware description language in the EDA software under the control of the automatic synthesis.
4. Digital integrated circuits are digital logic circuits or systems made by integrating components and wiring on the same semiconductor chip. According to the number of digital integrated circuits contain gate circuits or elements, devices, digital integrated circuits can be divided into small-scale integration (SSI) circuits, medium-scale integration MSI circuits, large-scale integration (LSI) circuits, ultra-large-scale integration VLSI circuits and ultra-large-scale integration (ULSI) circuits. Small-scale integrated circuits contain less than 10 gate circuits or no more than 100 components; medium-scale integrated circuits contain between 10 and 100 gate circuits or 100 to 1,000 components; large-scale integrated circuits contain more than 100 gate circuits or 10 to 10 components; and ultra-large-scale integrated circuits contain more than 10,000 gate circuits or 10 to 10 components. or more, or the number of components is between 10 and 10; the number of components of very large-scale integrated circuits is between 10 and 10. It includes: basic logic gates, flip-flops, registers, decoders, drivers, counters, shaping circuits, programmable logic devices, microprocessors, microcontrollers, DSPs, and so on.
General procurement process is as follows
1, involved in the development of new products;
2, the new product material composition of the breakdown of the material's basic information and specifications and models, unit price, batch purchase unit price, quality requirements of the cognitive knowledge;
3, looking for suppliers;
4, to determine the samples;
5, to issue a procurement contract or a purchase Agreement;
6, according to the requirements of the time in place, quality, quantity control;
7, supplier management;
8, supplier reconciliation;
9, payment!