參數(shù)資料
型號(hào)： OQ2538HP; OQ2538U
廠商： NXP Semiconductors N.V.
英文描述： SDH/SONET STM16/OC48 main amplifiers(SDH/SONET STM16/OC48主要放大器)
中文描述： SDH / SONET的STM16/OC48（SDH / SONET的STM16/OC48主要放大器主放大器）
文件頁(yè)數(shù)： 22/24頁(yè)
文件大?。?/td> 167K
代理商： OQ2538HP; OQ2538U
1998 Oct 14
22
Philips Semiconductors
Product specification
SDH/SONET STM16/OC48 main amplifiers
OQ2538HP; OQ2538U
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 “Data Handbook IC26; Integrated Circuit Packages”
(order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all LQFP
packages.
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 50 and 300 seconds depending on heating
method. Typical reflow peak temperatures range from
215 to 250
°
C.
Wave soldering
Wave soldering is
not
recommended for LQFP 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.
CAUTION
Wave soldering is NOT applicable for all LQFP
packages with a pitch (e) equal or less than 0.5 mm.
If wave soldering cannot be avoided, for LQFP
packages with a pitch (e) larger than 0.5 mm, 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.
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OQ2538HPS1 制造商:NXP Semiconductors 功能描述:
OQ2538U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET STM16/OC48 main amplifiers
OQ2541BHP 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:CLOCK/DATA RECOVERY|BIPOLAR|QFP|48PIN|PLASTIC
OQ2541HP 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET data and clock recovery unit STM1/4/16 OC3/12/48 GE
OQ2541U 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:SDH/SONET data and clock recovery unit STM1/4/16 OC3/12/48 GE
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