參數(shù)資料
型號(hào): ISP1761BE,518
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封裝: 14 X 20 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT425-1, LQFP-128
文件頁數(shù): 58/164頁
文件大?。?/td> 767K
代理商: ISP1761BE,518
ISP1761_5
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 13 March 2008
149 of 163
NXP Semiconductors
ISP1761
Hi-Speed USB OTG controller
17.4 Reow soldering
Key characteristics in reow soldering are:
Lead-free versus SnPb soldering; note that a lead-free reow process usually leads to
higher minimum peak temperatures (see Figure 33) than a SnPb process, thus
reducing the process window
Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
Reow temperature prole; this prole includes preheat, reow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classied in accordance with
Table 178 and 179
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reow
soldering, see Figure 33.
Table 178. SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reow temperature (
°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
Table 179. Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reow temperature (
°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
1.6 to 2.5
260
250
245
> 2.5
250
245
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