If any questions arise whether to use the Rated Ambient Temperature” the Rated Terminal Part Temperature” your usage conditions, please give priority to the Rated Terminal Part Temperature”
“
or “
in
“
.
For more details, please refer to Introduction of the derating curves based on the terminal part temperature” page 14 to 17.
The properly and electrostatically measured taping materials are used for the components, but attention should be paid to the fact that there is some danger the parts absorb on the
top tapes to cause a failure in the mounting and the parts are destructed by static electricity (1kV and more : 1J, 2A, 2B, 2E 0.5kV and more : 1E, Human Body Model 100pF
1.5kΩ) to change the resistance in the conditions of an excessive dryness or after the parts are given vibration for a long time as they are packaged on the tapes. Similarly, care
should be given not to apply the excessive static electricity when mounting on the boards.
●
Ionic impurities such as flux etc. that are attached to these products or those mounted onto a PCB, negatively affect their moisture resistance, corrosion resistance, etc. The flux
＋
−
may contain ionic substances like chlorine, acid, etc. while perspiration and saliva include ionic impurities like sodium (Na ), chlorine (Cl ) etc. Therefore these kinds of ionic
substances may induce electrical corrosion when they invade into the products. Either thorough washing or using RMA solder and flux are necessary since lead free solder contains
ionic substances. Washing process is needed, before putting on moisture proof material in order to prevent electrical corrosion.
●
Please pay attention that the top of an iron does not direct touch to the components. There is a risk that may cause a change in resistance. Take care that another risk may happen
that the protecting coat is carbonized in an instant when touched directly by the top of the iron, also climatic-proof for electric corrosion or insulation of protecting coat may be
dropped down. Be sure not to give high temperature on the top of the iron as it will degrade the protecting coat.
●
Avoid storing components under direct sun rays, high temperature/humidity. Direct sun rays will cause quality change of taping and difficulty of keeping appropriate peeling strength. 5
〜35℃/35〜75%RH, there is no deterioration of solderability for 12 months, but take special care for storing, because condensation, dust, and toxic gas like hydrogen sulfide,
sulfurous acid gas, hydrogen chloride, etc. may drop solderability.
●
The upper electrodes could be peeled off when a heat-resistant masking tape is attached to the mounted chip resistors and then detached from them. It is confirmed that the
adhesiveness gets stronger due to the exposure to heat under mounting. Accordingly, we recommend the use of masking tape be refrained. If the use of heat-resistant masking tape is
unavoidable, please make sure that the adhesives on the tape do not directly come in contact with the product.
[i=s]This post was last edited by lising on 2019-7-16 17:28[/i]In this experiment, the specified data is written to the specified address of the Data Flash inside CH549, and the data is sent to the P2...
The third generation of anti-noise products in China currently use dynamic noise reduction (DNR) technology. DNR technology dynamically adjusts the output voice switch through the changing voice peak ...
I bought an ESP32-C3 development board for 9.9 yuan a few days ago, with free shipping, and planned to try running micropython on it. It is very small and well made....
Frame memory is the data channel between the graphics processor and the display device. All the graphic data to be displayed is first stored in the frame memory and then sent out for display. Therefor...
The timer/counter structure of the AT89S51 microcontroller is shown in the figure below. Timer/counter T0 is composed of special function registers TH0 and TL0, and timer/counter Tl is composed of ...[Details]
According to news on September 8, according to foreign media, on September 7, Honda announced that it had reached an agreement with Tesla. Electric models launched in North America starting from 2025...[Details]
In order to further accelerate the construction of new energy vehicle charging infrastructure, promote industrial development, and improve the efficiency of the use of fiscal subsidies for new ener...[Details]
PICl8F series products are high-end products of Microchip Technology Co., Ltd. of the United States. Users mostly use C language for programming and design. PICC18 compiler of HI-TECH Software Pt...[Details]
Recently, high-tech company Osram launched the second-generation LED smart headlight Eviyos, which is expected to start mass production in 2020. It is reported that the second-generation Eviyos built...[Details]
There are four low-power modes for STM8S105: wait mode, stop mode, fast active stop mode and slow active stop mode. 1. Waiting mode: You can execute instruction wif() to enter waiting mode. In this...[Details]
As the number of electronic components in vehicles increases, the trend of automobile manufacturers outsourcing components is becoming increasingly obvious. Component manufacturers that undertake t...[Details]
Infineon Technologies Announces Fourth Quarter and Full Year 2021 Financial Results, Record Results Infineon Technologies AG announced its fourth quarter and full year 2021 results for the fiscal ...[Details]
Phosphorous
materials for white light LEDs
1. Phosphors
can convert various incident energies into photons for output. Materials with this function are called fl...[Details]
The newly launched PlayStation 5 is already breaking sales records in the United States, with the next-generation gaming console surpassing records set by some of the most popular consoles in the pas...[Details]
Recently, the UK's Ofcom announced the latest 5G spectrum auction results. The spectrum for this auction has a total bandwidth of 200MHz, divided into two frequency bands: • 80MHz spectrum resour...[Details]
As more and more car owners choose new energy vehicles, China Business News reporters visited several parking lots in Beijing to find out how the related charging facilities are being used.
In...[Details]
Introduction Most of the intelligent instruments now have intelligent interfaces and need centralized monitoring. Therefore, the stability of the centralized controller determines the stability ...[Details]
In practical applications, it is often necessary to monitor temperature signals at a distant location. To this end, a
solution integrating a
single-chip microcomputer
with a digita...[Details]
Although the new energy vehicle industry has developed rapidly in recent years and power battery technology has made great progress, the problem of long charging time has been widely criticized by ...[Details]
Domestic Chip Exchange
京公网安备 11010802033920号
EEWORLD
