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參數(shù)資料
| 型號(hào)： | AMIS30663NGA |
| 元件分類： | CAN |
| 英文描述： | High Speed CAN Transceiver |
| 中文描述： | 高速CAN收發(fā)器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 222K |
| 代理商： | AMIS30663NGA |
11
AMI Semiconductor - Rev. 1.4, Oct. 04
www.amis.com
AMIS-30663
High Speed CAN Transceiver
Data Sheet
10.0 Soldering
10.1 Introduction to Solering Surface Mount Package
This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in the AMIS "Data Handbook IC26;
Integrated Circuit Packages" (document order number 9398 652 90011).
There is no soldering method that is ideal for all surface mount IC packages. Wave soldering is not always suitable for surface mount ICs, or for printed-
circuit boards with high population densities. In these situations reflow soldering is often used.
10.2 Reflow Soldering
Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen
printing, stencilling or pressure-syringe dispensing before package placement.
Several methods exist for reflowing; for example, infrared/convection heating in a conveyor type oven. Throughput times (preheating, soldering and
cooling) vary between 100 and 200 seconds depending on heating method.
Typical reflow peak temperatures range from 215 to 250°C. The top-surface temperature of the packages should preferably be kept below 230°C.
10.3 Wave Soldering
Conventional single wave soldering is not recommended for surface mount devices (SMDs) or printed-circuit boards with a high component density, as
solder bridging and non-wetting can present major problems.
To overcome these problems the double-wave soldering method was specifically developed.
If wave soldering is used the following conditions must be
observed for optimal results:
Use a double-wave soldering method comprising a turbulent wave with high upward pressure followed by a smooth laminar wave.
For packages with leads on two sides and a pitch (e):
° Larger than or equal to 1.27mm, the footprint longitudinal axis is preferred to be parallel to the transport direction of the printed circuit board;
° Smaller than 1.27mm, the footprint longitudinal axis must be parallel to the transport direction of the printedcircuit board. The footprint must
incorporate solder thieves at the downstream end.
For packages with leads on four sides, the footprint must be placed at a 45o angle to the transport direction of the printed circuit board. The footprint
must incorporate solder thieves downstream and at the side corners.
During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer
or syringe dispensing. The package can be soldered after the adhesive is cured.
Typical dwell time is four seconds at 250°C. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications.
10.4 Manual Soldering
Fix the component by first soldering two diagonally-opposite end leads. Use a low voltage (24V or less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to 300°C.
When using a dedicated tool, all other leads can be soldered in one operation within two to five seconds between 270 and 320°C.
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