- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385819 > SC4000 (NXP SEMICONDUCTORS) Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 200 psi, Vacuum Gage, 1/8-27 NPT, 10 Vdc excitation PDF資料下載
參數(shù)資料
| 型號： | SC4000 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 路由/交換 |
| 英文描述： | Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 200 psi, Vacuum Gage, 1/8-27 NPT, 10 Vdc excitation |
| 中文描述： | TELECOM, DIGITAL TIME SWITCH, PQFP100 |
| 封裝： | TQFP-100 |
| 文件頁數(shù)： | 47/52頁 |
| 文件大?。?/td> | 179K |
| 代理商： | SC4000 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁當前第47頁第48頁第49頁第50頁第51頁第52頁
2000 Sep 07
47
Philips Semiconductors
Preliminary specification
Universal Timeslot Interchange
SC4000
SOLDERING
Introduction to soldering surface mount packages
Thistextgivesaverybriefinsighttoacomplextechnology.
A more in-depth account of soldering ICs can be found in
our “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 can still be used for
certainsurfacemountICs,butitisnotsuitableforfinepitch
SMDs. In these situations reflow soldering is
recommended.
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,
convection or convection/infrared 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 preferable be kept below 220
°
C for
thick/large packages, and below 235
°
C for small/thin
packages.
Wave soldering
Conventional single wave soldering is not recommended
forsurfacemountdevices(SMDs)orprinted-circuitboards
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 1.27 mm, the footprint
longitudinal axis is
preferred
to be parallel to the
transport direction of the printed-circuit board;
– smaller than 1.27 mm, the footprint longitudinal axis
be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
Forpackageswithleadsonfoursides,thefootprintmust
be placed at a 45
°
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 4 seconds at 250
°
C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Manual soldering
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V 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 2 to 5 seconds between
270 and 320
°
C.
相關PDF資料 |
PDF描述 |
|---|---|
| SC68C94 | nullQuad universal asynchronous receiver/transmitter QUART |
| SC68C94A1A | nullQuad universal asynchronous receiver/transmitter QUART |
| SC68C94A1N | Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Gage, Cell with body o-ring, 10 Vdc excitation |
| SC68C94C1A | nullQuad universal asynchronous receiver/transmitter QUART |
| SC68C94C1N | Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Gage, flush mount, 10 Vdc excitation |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SC4002A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD MODULES SC4002A ( 40 CHARACTERS x 2 LINES ) |
| SC4002ALM-6 | 功能描述:AMPLIFIER TRIP UNIVERSAL INPUT D 制造商:cynergy 3 系列:SC 零件狀態(tài):在售 類型:過程感應 跳脫狀態(tài):通電高/低 跳脫范圍:- 延遲時間:無延遲 電壓 - 電源:16 ~ 30VDC 輸出類型:繼電器 電路:SPDT（1 C 形） 不同電壓時的觸頭額定電流:3A @ 240VAC 安裝類型:DIN 軌道 工作溫度:0°C ~ 55°C 標準包裝:1 |
| SC4004 | 制造商:Ferraz Shawmut 功能描述: |
| SC4004A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD MODULES 40 CHARACTERS x 4 LINES |
| SC4004B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:40 CHARACTERS x 4 LINES |
發(fā)布緊急采購，3分鐘左右您將得到回復。