Yearly Archives: 2025

　　International air transport refers to the use of aircraft as a means of transportation to transport a variety of goods between countries. One of the distinctive features of international air transport is its speed. Common jet transport speeds can reach 850-900 km/h, which makes international air transport much faster than other modes of transport. Moreover, the collection time of international air freight will not be as long as that of sea freight.To some extent, international logistic Our development has surpassed many peer businesses, but it has never stopped moving forward. https://www.honzalogistics.com/

　　Advantages and Disadvantages of International Air Transport: Advantages: First, high-speed directness: Since there are fewer air routes restricted by natural geographical conditions, international air transport usually takes a shorter distance between two points, which has the advantage of high-speed directness.

　　Lower packaging requirements: Due to the stability of air navigation and the automatic landing system that reduces the replacement rate, international air transport has relatively low packaging requirements for goods.

　　Disadvantages High cost: Compared with other modes of transportation, the cost of international air transportation is higher, involving aviation fuel fees, airline service fees, and many other expenses.

　　Restricted cargo volume: Due to restrictions on aircraft and space, international air transports cannot carry large cargo or large quantities of cargo.

　　Dependence on weather conditions: International air transport is more sensitive to weather conditions, and severe weather conditions may cause flight delays or cancellations.

　　What types of goods are suitable for international air transport? The first category of high-value goods:

　　Jewelry: such as diamonds, gemstones, gold and silver jewelry, etc.

　　Luxury goods: such as high-end fashion, famous watches, brand-name bags, etc.

　　Electronic products: such as smartphones, tablets, high-end cameras, etc.The second category of fresh food: such as seafood, fruits, vegetables, etc. Transporting these goods quickly maintains their freshness and quality. Therefore, the best choice for these goods is international air transport, which can maximize the protection of the value of the products. The third category of emergency spare parts: such as key components of industrial equipment, which are crucial to the continuity of production. In this case, you must choose the shortest transportation method to minimize the losses caused by production.

　　In which industries are international air transports used?

　　Express logistics industry:

　　The rapid development of e-commerce has made express logistics one of the most widely used areas for international air transport. Because small e-commerce parcels are relatively light, the cost of air transport is not too high. At the same time, freight efficiency greatly improves, better meeting the logistics requirements of e-commerce buyers and increasing the transaction rate of products.

　　International trade industry:

　　International air transport plays an important role in the field of international trade. For high-value goods with high freshness requirements, such as fruits, flowers, seafood, etc., air transport has become the most commonly used mode of transportation. These goods are extremely sensitive to time requirements, and the speed of air transport can ensure that the goods are delivered within the shelf life, thereby maintaining the quality and value of the goods.

　　Medical and health industry:

　　Many industries widely use air transport in the fields of medicine and health. Air transport serves as the most effective mode of transportation for medical services that require quick delivery, such as emergency medical rescue and organ transplantation. In addition, air transport can also quickly deliver medicines, medical equipment, etc. to the destination to meet the medical needs of remote areas and and emergencies.

　　Passenger tourism industry:

　　As people¨s living standards improve, more and more people choose to travel by plane for tourism and business trips. Air transportation can provide efficient and comfortable transportation services to meet people¨s needs for time and comfort.

　　Defense and military industry:

　　In summary, international air transportation is very popular in many industries and plays an indispensable role. Its fast, safe, and efficient characteristics enable these industries to meet customer needs more effectively. However, to stand out in the market, they must also improve operational efficiency to maintain a competitive advantage in fierce competition.

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　　Schottky diode is a kind of semiconductor device with low power consumption, high current and ultra-high speed. Its reverse recovery time can be as short as a few nanoseconds, the forward conduction voltage drop is only about 0.4v, and the rectified current can reach several thousand amps.in fact Resistors quote It is more and more welcomed by our customers, and its market performance is gradually improving. https://www.xinyun-ic.com/

　　Schottky diode is a metal-semiconductor device made of noble metal (gold, silver, aluminum, platinum, etc.) A as the positive electrode and N-type semiconductor B as the negative electrode, and the barrier formed on the contact surface between them has rectification characteristics. Because there are a lot of electrons in N-type semiconductors and only a few free electrons in precious metals, electrons diffuse from B with high concentration to A with low concentration. Obviously, there are no holes in metal A, so there is no diffusion movement of holes from A to B. With the continuous diffusion of electrons from B to A, the electron concentration on the surface of B gradually decreases, and the surface electrical neutrality is destroyed, so a potential barrier is formed, and its electric field direction is B ★ A. However, under the action of this electric field, the electrons in A will also drift from A to B, thus weakening the electric field formed by diffusion movement. When a space charge region with a certain width is established, the electron drift motion caused by electric field and the electron diffusion motion caused by different concentrations reach a relative balance, and a Schottky barrier is formed.

　　SR5100.jpg

　　Schottky barrier diode (SBD) has the advantages of high switching frequency and low forward voltage, but its reverse breakdown voltage is relatively low, mostly not higher than 60V, and the highest is only about 100V, which limits its application range. For example, in switching power supply (SMPS) and power factor correction (PFC) circuits, freewheeling diodes of power switching devices, high-frequency rectifier diodes of more than 100V for transformer secondary, high-speed diodes of 600V~1.2kV in RCD buffer circuits, and 600V diodes for PFC boost, only fast recovery epitaxial diodes (FRED) and ultra-fast recovery diodes (UFRD) are used. At present, the reverse recovery time Trr of UFRD is also above 20ns, which can not meet the needs of SMPS with 1MHz~3MHz in fields such as space station. Even for SMPS with hard switch of 100kHz, due to the high conduction loss and switching loss of UFRD and high shell temperature, a large radiator is needed, which increases the size and weight of SMPS, which is not in line with the development trend of miniaturization and thinness. Therefore, the development of high voltage SBD above 100V has always been a research topic and a hot spot of concern. In recent years, SBD has made a breakthrough, with 150V and 200V high-voltage SBD on the market, and more than 1kV SBD made of new materials has also been successfully developed, thus injecting new vitality into its application.

　　Friends or customers have been asking me what is the difference between Schottky diode SR540 and SB540. Today we will talk about this problem.In order to grow rapidly, Resistors quote Do not hesitate to change the strategy and rearrange the products, so as to obtain unexpected results. https://www.xinyun-ic.com/

　　In fact, the parameters of SR540 and SB540 are the same, both of which are 5A 40V. As for why the models are different, it is because different manufacturers have differences in screen printing, which means they don’t want to repeat with others and have their own uniqueness. Please see below for specific parameters.

　　Maximum reverse repetitive peak voltage: 40V

　　Maximum DC blocking voltage: 40V

　　Maximum average forward rectified current: 5.0A

　　When current =5.0A, voltage drop: 0.55v

　　Maximum reverse DC current ta = 25≧: 0.5ma.

　　Working temperature range: -65 to +150≧

　　Storage temperature: -65 to +150≧

　　Reverse recovery time: less than 10ns (nanosecond)

　　High temperature welding: 250c/10 sec, 0.375 “(9.5 mm) lead length, 5 lbs (2.3kg) tension.

　　Package: DO-27/DO-201AD

　　As we all know, MB6F is a rectifier bridge stack, which encapsulates SOP-4. Its function is to convert alternating current whose level fluctuates around zero into unidirectional direct current through the unidirectional conduction characteristics of diodes, and its function is rectification. Please see below for specific parameters and pin diagram.Before that, pcb instant quote The market has also soared for a time, which has attracted the attention of a wide range of investors. https://www.xinyun-ic.com/

　　MB6F Specification: Click to download

　　High Surge Overload Rate: 30A Peak

　　Maximum repetitive peak reverse voltage: 600v V.

　　Maximum DC blocking voltage: 600v V.

　　When current =1.0A, forward voltage drop: 1.0V.

　　Maximum reverse DC current ta = 25≧: 5.0ua.

　　Rated DC blocking voltage per leg ta = 125≧: 500.0ua.

　　Working temperature and storage temperature range: -55 to +150≧

　　Weight: 0.078 ounces, 0.22 grams

　　High temperature welding guarantee: 260≧/10s.

　　Polarity: “-“indicates the cathode end (see the figure below).

　　Friends or customers have been asking me what is the difference between Schottky diode SR540 and SB540. Today we will talk about this problem.As it happens, many people are killed Connectors, Interconnects quote And bring more benefits, make it flourish, and promote the industry greatly. https://www.xinyun-ic.com/

　　In fact, the parameters of SR540 and SB540 are the same, both of which are 5A 40V. As for why the models are different, it is because different manufacturers have differences in screen printing, which means they don’t want to repeat with others and have their own uniqueness. Please see below for specific parameters.

　　Maximum reverse repetitive peak voltage: 40V

　　Maximum DC blocking voltage: 40V

　　Maximum average forward rectified current: 5.0A

　　When current =5.0A, voltage drop: 0.55v

　　Maximum reverse DC current ta = 25≧: 0.5ma.

　　Working temperature range: -65 to +150≧

　　Storage temperature: -65 to +150≧

　　Reverse recovery time: less than 10ns (nanosecond)

　　High temperature welding: 250c/10 sec, 0.375 “(9.5 mm) lead length, 5 lbs (2.3kg) tension.

　　Package: DO-27/DO-201AD

　　As we all know, MB6F is a rectifier bridge stack, which encapsulates SOP-4. Its function is to convert alternating current whose level fluctuates around zero into unidirectional direct current through the unidirectional conduction characteristics of diodes, and its function is rectification. Please see below for specific parameters and pin diagram.I think Connectors, Interconnects quote It will definitely become a leader in the industry and look forward to the high-end products. https://www.xinyun-ic.com/

　　MB6F Specification: Click to download

　　High Surge Overload Rate: 30A Peak

　　Maximum repetitive peak reverse voltage: 600v V.

　　Maximum DC blocking voltage: 600v V.

　　When current =1.0A, forward voltage drop: 1.0V.

　　Maximum reverse DC current ta = 25≧: 5.0ua.

　　Rated DC blocking voltage per leg ta = 125≧: 500.0ua.

　　Working temperature and storage temperature range: -55 to +150≧

　　Weight: 0.078 ounces, 0.22 grams

　　High temperature welding guarantee: 260≧/10s.

　　Polarity: “-“indicates the cathode end (see the figure below).

　　Friends or customers have been asking me what is the difference between Schottky diode SR540 and SB540. Today we will talk about this problem.For the immediate pressure, pcb instant quote With its own coping style, it can break the predicament and usher in a new life through the quality of the product itself. https://www.xinyun-ic.com/

　　In fact, the parameters of SR540 and SB540 are the same, both of which are 5A 40V. As for why the models are different, it is because different manufacturers have differences in screen printing, which means they don’t want to repeat with others and have their own uniqueness. Please see below for specific parameters.

　　Maximum reverse repetitive peak voltage: 40V

　　Maximum DC blocking voltage: 40V

　　Maximum average forward rectified current: 5.0A

　　When current =5.0A, voltage drop: 0.55v

　　Maximum reverse DC current ta = 25≧: 0.5ma.

　　Working temperature range: -65 to +150≧

　　Storage temperature: -65 to +150≧

　　Reverse recovery time: less than 10ns (nanosecond)

　　High temperature welding: 250c/10 sec, 0.375 “(9.5 mm) lead length, 5 lbs (2.3kg) tension.

　　Package: DO-27/DO-201AD

　　Friends or customers have been asking me what is the difference between Schottky diode SR540 and SB540. Today we will talk about this problem.With the expanding influence of the industry, Resistors quote Our business is also constantly spreading, and the development of the market is also gradually advancing. https://www.xinyun-ic.com/

　　In fact, the parameters of SR540 and SB540 are the same, both of which are 5A 40V. As for why the models are different, it is because different manufacturers have differences in screen printing, which means they don’t want to repeat with others and have their own uniqueness. Please see below for specific parameters.

　　Maximum reverse repetitive peak voltage: 40V

　　Maximum DC blocking voltage: 40V

　　Maximum average forward rectified current: 5.0A

　　When current =5.0A, voltage drop: 0.55v

　　Maximum reverse DC current ta = 25≧: 0.5ma.

　　Working temperature range: -65 to +150≧

　　Storage temperature: -65 to +150≧

　　Reverse recovery time: less than 10ns (nanosecond)

　　High temperature welding: 250c/10 sec, 0.375 “(9.5 mm) lead length, 5 lbs (2.3kg) tension.

　　Package: DO-27/DO-201AD

　　As the mother of electronic components, circuit board plays an important role in electronic applications. According to different design principles, circuit boards can be divided into single panel, multilayer board, soft board, hard board, soft-hard board and so on.understand pcb circuit board manufacturers In order to better serve customers and reflect the core competitiveness of products. https://intechcircuit.com/

　　At present, the common PCB colors on the market are green, black, blue, yellow, purple, red and brown, and white and pink PCBs have appeared recently.

　　So, why do PCB boards have different colors? Have you found that most of the circuit boards are green, but other colors are rare? Why? Next, Shenzhen Lianxiaobian will give you a wave of knowledge about circuit boards ~

　　Why do PCBs have different colors?

　　In the production process of PCB, the final surface of copper layer is smooth and unprotected, whether by additive process or reduction method. Although the chemical properties of copper are not as easy to oxidize as pure copper of aluminum, iron and magnesium in contact with oxygen in water, the thickness of copper layer in PCB circuit board is very thin, and the oxidized copper will become a poor conductor of electricity, which will greatly damage the electrical performance of the whole PCB. In order to prevent copper oxidation, separate the soldered part from the non-soldered part of PCB and protect the surface of PCB, the design engineer will apply a special coating on the surface of PCB to form a protective layer with a certain thickness to block the contact between copper and air. This coating is called solder resist and the material used is solder resist paint. In order to facilitate maintenance and manufacturing, PCB usually needs to print small text on the board. Therefore, engineers added various colors to the solder resist paint, and finally formed a “colorful” circuit board.

　　Why are green inks widely used?

　　The color of solder resist mainly depends on the color of solder resist ink. Green ink is the most widely used and the cheapest in the market. In fact, the solder resist ink on the market is not limited to one kind of green, and there are many colors such as red, blue, purple, black and yellow, but green is the most common one. The main reason is that the use of green solder resist ink has the following advantages: it is convenient for optical positioning correction.

　　The manufacturing process of the circuit board itself includes STM welding process, and this process needs to be tinned and finally verified by AOI. These processes need to be calibrated by optical positioning, and the green background color has a better recognition effect for the instrument. In the yellow room, the visual effect is better. The whole PCB product has to go through the processes of board making and SMT in the production process. Usually, when the circuit board is used in the production and processing of electronic products, there will be some processes that need to pass through the yellow room. According to the optical law, the green circuit board has a better visual effect in the yellow room, and it is easier to check the production of electronic products.

　　It is beneficial for workers to observe the circuit board.

　　At present, due to the production process and other problems, the quality inspection process of many lines still depends on the naked eye observation and identification of workers (of course, flying needle testing technology is mostly used at present). It is very tiring to keep staring at the board under strong light. Using green as the background color of circuit board can reduce the damage of strong light to workers’ eyes, so most manufacturers in the market use green PCB at present.

　　Environmental protection and low cost.

　　Because the circuit board needs to be recycled at high temperature when it is discarded, and the green solder resist ink will not release toxic gases, recycling is more environmentally friendly. Thanks to the above advantages, the adoption rate of green solder resist ink is the highest and the production process is the most mature. Therefore, the cost of using green solder resist ink to produce circuit boards is also lower.