欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數資料
型號: CUW256-1570-16AA95
元件分類: 插座
英文描述: BGA256, IC SOCKET
封裝: ROHS COMPLIANT
文件頁數: 6/8頁
文件大小: 1199K
代理商: CUW256-1570-16AA95
Socket Mounting Recommendations and Reflow Profile
E-tec Interconnect Ltd, Industrial Zone C, CH-1072 Forel (Lavaux), Switzerland
Phone +41-21-781 08 10 www.e-tec.com info@e-tec.com
E-tec Socket Mounting Recommendations
PRELIMINARY
4
Verifying the Assembly
After the socket has been reflowed to the PCB, open and short testing should be partaken to
ensure proper assembly. The assembly house typically performs x-ray inspection to verify non-
shorting of pins. However, as this is only a visual inspection, we recommend using a continuity
tester or ohmmeter and simply sweeping random rows and columns of pins to ensure no shorting
of pins. No damage to the springs will occur if very slight pressure from the meter’s tips is
applied (just touch the probes to the springs). For fine pitch sockets, a microscope would be
helpful in placing the meter’s tips appropriately.
After verifying the absence of shorts, open testing should be performed. The most direct, yet
tedious, method is to use the continuity tester to directly probe each pin to a breakout or test
point on the board. Again no damage will occur if the probes are touched to the springs. If heavy
pressure is required to push the socket body towards the PCB to achieve continuity, this means a
poor solder joint. If no such test points exist, then the BGA’s via field on the backside of the
PCB should be kept solder-mask free to allow for such probing. If the via field is kept open, a
simpler open testing method can be performed. Simply use a wet sponge (or some other
conductive material) and hold it onto the via field. This shorts all the pins together on the PCB.
Insert one probe of the continuity tester into the sponge. Now sweep the pins of the socket with
the other probe and check for continuity.
If the above procedures show any shorts or opens, then it is advisable to have the assembly house
re-evaluate the assembly method used. An incorrect stencil can lead to too much or too little
solder paste, easily leading short or open conditions and a solder paste with Ag contents
(>=0.5%) may also result in solder joint failures. These are the primary reasons for socket
mounting failures.
Important Notes:
a) Screw/Twist Lock Socket
When tightening the lid of a Screw or Twist Lock socket, it is imperative to not over-tighten the
retention screws, otherwise irreparable damage may occur. Such damage is not covered by
warranty and will be solely the end user’s responsibility. The maximum allowed torque on these
retention screws is 7cN-m (10oz-in) for sockets up to 800 pins and for sockets as of 800 pins the
torque value needs to be increased but should not exceed a maximum of 10cN-m (14oz-in). E-tec
sells the torque screwdriver TOL-7CN-TORQUE which is preset to 7cN-m, but which can be
adjusted to higher torque values for the high pin count sockets.
相關PDF資料
PDF描述
CUW180-0628-14CB95 BGA180, IC SOCKET
CUW180-0729-14CB95 BGA180, IC SOCKET
CUW256-0630-16AA95 BGA256, IC SOCKET
CPW896-1070-30AB95L BGA896, IC SOCKET
CPW896-1229-30AB95 BGA896, IC SOCKET
相關代理商/技術參數
參數描述
CUWJASP-6H5J-E4K6-DG-1-150-R18-ZD 制造商:OSRAM 功能描述:OOSCUWJASP-6H5J-E4K6-DG-1-150-R18-ZD TOP
CUWJASP-6H5J-E4N8-DG 制造商:OSRAM 功能描述:OOSCUWJASP-6H5J-E4N8-DG OSLON
CV 制造商:Power-One 功能描述:
CV 3-1500 功能描述:VOLTAGE TRANSDUCER 1500V RoHS:是 類別:傳感器,轉換器 >> 專用 系列:CV 標準包裝:40 系列:*
CV0090003 制造商: 功能描述: 制造商:undefined 功能描述:
主站蜘蛛池模板: 中超| 南召县| 广饶县| 沈丘县| 金溪县| 怀远县| 马边| 县级市| 新闻| 峨边| 诏安县| 平凉市| 陇西县| 九龙坡区| 忻州市| 灵丘县| 定安县| 大港区| 广元市| 合川市| 柘荣县| 灵石县| 新干县| 旺苍县| 兰州市| 抚州市| 赤水市| 高平市| 顺平县| 樟树市| 杂多县| 滁州市| 土默特左旗| 盐源县| 津市市| 沁阳市| 岫岩| 翼城县| 修武县| 德庆县| 江陵县|