參數(shù)資料
型號: ISP1102BS
廠商: NXP SEMICONDUCTORS
元件分類: 通用總線功能
英文描述: Advanced Universal Serial Bus transceiver
中文描述: LINE TRANSCEIVER, PQCC14
封裝: 2.50 X 2.50 MM, 0.85 MM HEIGHT, HALOGEN FREE, PLASTIC, SOT-773-1, HVQFN-14
文件頁數(shù): 19/23頁
文件大小: 533K
代理商: ISP1102BS
Philips Semiconductors
ISP1102
Advanced USB transceiver
Product data
Rev. 03 — 02 September 2003
19 of 23
9397 750 11228
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
There is no soldering method that is ideal for all IC packages. Wave soldering can still
be used for certain surface mount ICs, but it is not suitable for fine pitch SMDs. In
these situations reflow soldering is recommended. In these situations reflow
soldering is recommended.
16.2 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. Driven by legislation and
environmental forces the worldwide use of lead-free solder pastes is increasing.
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 270
°
C depending on solder
paste material. The top-surface temperature of the packages should preferably be
kept:
below 220
°
C (SnPb process) or below 245
°
C (Pb-free process)
for all BGA and SSOP-T packages
for packages with a thickness
2.5 mm
for packages with a thickness < 2.5 mm and a volume
350 mm
3
so called
thick/large packages.
below 235
°
C (SnPb process) or below 260
°
C (Pb-free process) for packages with
a thickness < 2.5 mm and a volume < 350 mm
3
so called small/thin packages.
Moisture sensitivity precautions, as indicated on packing, must be respected at all
times.
16.3 Wave soldering
Conventional single wave soldering is not recommended for surface mount devices
(SMDs) or printed-circuit boards 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
must
be parallel to the
transport direction of the printed-circuit board.
The footprint must incorporate solder thieves at the downstream end.
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