At present, there are two types of air-cooled radiators for high-power power electronic devices: casting and profiles. We collectively refer to them as solid radiators to distinguish them from hollow radiators manufactured according to the principle of heat pipes or thermosiphons. The biggest problem with physical radiators is that as the power increases, the weight of the radiator increases faster, making it very unreasonable. The direct calculation of the shape of a solid radiator requires a numerical method, which requires a large amount of work and is difficult to reveal the influence of various factors. If double-sided cooling is used, the radiator is composed of two heat sinks, and the total heat dissipation and weight are twice that of the heat sink. Calculation results and discussion According to the above model, if the characteristic size or geometric average size of the heat sink is given, it is not difficult to calculate the heat dissipation heat resistance and the calculation results of the metal consumption map required for the unit heat dissipation, which correspond to the three materials of aluminum copper silver And aluminum hollow radiator. If the thermal conductivity of the material is infinite, the thermal resistance will no longer exist. The performance and prospective resistance of solid high-power air-cooled radiators such as Hu Weilin and the General Thermal Supplement are convection thermal resistance. At this time, there is no temperature drop in heat conduction, and the temperature of all the heat dissipation surfaces is equal to five. Considering that the heat sink contains two heat dissipation bodies with heat dissipation area, the heat dissipation amount and thermal resistance value are respectively a graph. The curve of the resistance's share in the total thermal resistance as a function of the geometric mean size of the heat sink. When it is greater than a certain value, the former share should exceed the latter. This value can be used as a reasonable limit for the size of the solid heat sink. The greater the thermal conductivity of the material, the greater the corresponding value. A size that is too large is not desirable, because when the thermal conductivity of the heat conduction is dominant, reducing the convection thermal resistance will not have a significant effect on the total thermal resistance.
Antenk coin cell battery retainers Designed for memory back-up and stand-by applications, these contacts permit quick and easy coin cell replacement and installation. Eliminating "soldered-in" cells, computer, video, telecommunication and similar PCB based product users now have a reliable, "no tools required" method for changing batteries.
Extremely economical, these retainer contacts are available in surface mount (SMT) or thru hole mount (THM) styles for 4.8mm, 6.8mm, 11.6mm,12mm, 16mm, 20mm, 23mm and 24mm coin cells. The THM version has stable mounting legs for excellent board retention during wave solder. The SMT version includes a unique solder tail "flow-hole" design to bolster reflow and strengthen solder joints. They are manufactured from phosphor bronze, precision stamped and are plated with either a high luster nickel finish or matte tin finish ideal for low temperature soldering enviornments. Both feature dual spring contacts to assure reliable connections and a low contact resistance.
Antenk Coin/Button Cell-retainers And Contacts
Coin Cell Retainers are simple metal contacts that both electrically connect coin cells and hold them in place, while taking up minimal additional space on the PCB. They feature nickel-plating, and since most coin cells have nickel shells this helps to prevent galvanic corrosion, an electrochemical process that can damage dissimilar metals that are in electrical contact. Our retainers are always designed with automation in mind, and can be easily picked and placed, with both through hole and surface mount retainers available for most coin cell sizes. Combining the ease of automation with the low cost of Antenk's retainers, it is no wonder they are such a popular product.
Coin Cell, Button Cell, Retainers, Contacts
Designed for memory backup and standby applications, Antenk's compact coin cell battery retainers permit quick and easy coin cell replacement and installation. By eliminating soldered-in cells, computer, video, telecommunication, and similar PCB based product users now have a reliable, no tools required method for changing batteries.
These holders and retainers are available in surface-mount (SMT) or through-hole-mount (THM) styles for 4.8 mm to 24 mm coin cells. The THM version has stable mounting legs for excellent board retention during wave soldering. The SMT version includes a unique solder tail flow-holedesign to bolster reflow and strengthen solder joints. Both feature dual spring contacts to assure reliable connections and low contact resistance.
Coin Cell, Button Cell, Retainers, Contacts Features
Available in THM or SMT configurations
SMT solder tail with flow-hole design for increased joint strength
SMT solder tail located outside of retainer body which facilitates visual inspection of the solder joints
THM legs maintain relative position during and after soldering
Reliable spring tension assures low contact resistance
Retains battery securely to withstand shock and vibration
Ideally suited for high-density packaging
Ideal for low-profile space-saving PCB applications
Designed for reflow and all PCB soldering applications
Compatible with all wave and reflow operations
Compatible with most vacuum and mechanical, pick and place assembly systems
Matte-tin plate for lower soldering temperatures ideal where other temperature sensitive components are being used
Tin-nickel plated retainers are ideal for lead-free, high-temperature soldering applications
Retainers available for coin cell batteries from 4.8 mm to 24 mm diameter
Coin Cell Retainers by Size of Cell
191 | 335 | CR1025 | CR1216 | CR1220 | CR1225 | CR1632 | CR2016 | CR2032 | CR2320 | CR2325 | CR2330 | CR2354 | CR2430 | CR2450 | CR2477 | F3 iButton | F5 iButton | LR1120 | LR44 | ML414 | SR512SW | SR60 | V80H or CP1654 | BR1025 | BR1216 | BR1220 | BR1225 | BR1632 | BR2016 | BR2032 | BR2320 | BR2325 | BR2330 | BR2450 | BR2477 | Other Sizes
Coin/Button Cell-retainers And Contacts
Button Contacts,Coin Cell Retainers And Contacts,Coin Cell Retainers
ShenZhen Antenk Electronics Co,Ltd , https://www.antenk.com