參數(shù)資料
型號(hào)： TDA5637T
廠商： NXP SEMICONDUCTORS
元件分類： 調(diào)諧器
英文描述： 9 V VHF, hyperband and UHF mixers- oscillators for TV and VCR 3-band tuners
中文描述： 3-BAND, VIDEO TUNER, PDSO24
封裝： PLASTIC, SO-24
文件頁(yè)數(shù)： 25/28頁(yè)
文件大小： 217K
代理商： TDA5637T
1996 Jun 10
25
Philips Semiconductors
Product specification
9 V VHF, hyperband and UHF mixers-
oscillators for TV and VCR 3-band tuners
TDA5636; TDA5637
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 SO and
SSOP 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 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
SO
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
The longitudinal axis of the package footprint must be
parallel to the solder flow.
The package footprint must incorporate solder thieves at
the downstream end.
SSOP
Wave soldering is
not
recommended for SSOP 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 longitudinal axis of the package footprint must
be parallel to the solder flow and must incorporate
solder thieves at the downstream end.
Even with these conditions, only consider wave
soldering SSOP packages that have a body width of
4.4 mm, that is SSOP16 (SOT369-1) or
SSOP20 (SOT266-1)
.
M
ETHOD
(SO
AND
SSOP)
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
TDA5637B 9 V VHF, hyperband and UHFmixers- oscillators for TV and VCR 3-band tuners(應(yīng)用于TV和 VCR三頻帶調(diào)諧的9 VVHF，UHF和超頻帶混頻器/振蕩器)
TDA5636B 9 V VHF, hyperband and UHFmixers- oscillators for TV and VCR 3-band tuners(應(yīng)用于TV和 VCR三頻帶調(diào)諧的9 VVHF，UHF和超頻帶混頻器/振蕩器)
TDA5636BM 9 V VHF hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners
TDA5636BT 9 V VHF hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners
TDA5637BM 9 V VHF hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners
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