參數(shù)資料
型號(hào)： SAA7120H-01
廠商： NXP Semiconductors N.V.
英文描述： Digital Video Encoder (ConDENC)
中文描述： 數(shù)字視頻編碼器（ConDENC）
文件頁(yè)數(shù)： 29/32頁(yè)
文件大小： 225K
代理商： SAA7120H-01
1997 Jan 06
29
Philips Semiconductors
Preliminary specification
Digital Video Encoder (ConDENC)
SAA7120; SAA7121
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “IC Package Databook”(order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all QFP
packages.
The choice of heating method may be influenced by larger
plastic QFP packages (44 leads, or more). If infrared or
vapour phase heating is used and the large packages are
not absolutely dry (less than 0.1% moisture content by
weight), vaporization of the small amount of moisture in
them can cause cracking of the plastic body. For more
information, refer to the Drypack chapter in our “Quality
Reference Handbook”(order code 9397 750 00192).
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 techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250
°
C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45
°
C.
Wave soldering
Wave soldering is
not
recommended for QFP packages.
This is because of the likelihood of solder bridging due to
closely-spaced leads and the possibility of incomplete
solder penetration in multi-lead devices.
If wave soldering cannot be avoided, the following
conditions must be observed:
A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave)
soldering technique should be used.
The footprint must be at an angle of 45
°
to the board
direction and must incorporate solder thieves
downstream and at the side corners.
Even with these conditions, do not consider wave
soldering the following packages: QFP52 (SOT379-1),
QFP100 (SOT317-1), QFP100 (SOT317-2),
QFP100 (SOT382-1) or QFP160 (SOT322-1).
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.
Maximum permissible solder temperature is 260
°
C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150
°
C within
6 seconds. 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.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) 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(guān)PDF資料
PDF描述
SAA7121 Digital Video Encoder (ConDENC)
SAA7124HZ Digital Video Encoder ECO-DENC
SAA7124 Digital Video Encoder ECO-DENC
SAA7124H Digital Video Encoder ECO-DENC
SAA7125 Digital Video Encoder ECO-DENC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7121 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Video Encoder (ConDENC)
SAA7121H 制造商:NXP Semiconductors 功能描述:
SAA7121H/V2 制造商:NXP Semiconductors 功能描述:
SAA7121H/V2,518 功能描述:視頻 IC SAA7121H/QFP44/REEL13DP//V2 RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
SAA7121H/V2,557 功能描述:視頻 IC DIG VID ENCODER NTSC PAL RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel
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