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HSMS-2812 Datasheet(PDF) 6 Page - AVAGO TECHNOLOGIES LIMITED

Part # HSMS-2812
Description  Surface Mount RF Schottky Barrier Diodes
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HSMS-2812 Datasheet(HTML) 6 Page - AVAGO TECHNOLOGIES LIMITED

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6
Figure 8. Surface Mount Assembly Profile.
25
Time
Tp
T L
tp
tL
t 25
° C to Peak
Ramp-up
ts
Ts min
Ramp-down
Preheat
Critical Zone
T L to Tp
Ts max
Lead-Free Reflow Profile Recommendation (IPC/JEDEC J-STD-020C)
Reflow Parameter
Lead-Free Assembly
Average ramp‑up rate (Liquidus Temperature (TS(max) to Peak)
3°C/ second max
Preheat
Temperature Min (TS(min))
150°C
Temperature Max (TS(max))
200°C
Time (min to max) (tS)
60‑180 seconds
Ts(max) to TL Ramp‑up Rate
3°C/second max
Time maintained above:
Temperature (TL)
217°C
Time (tL)
60‑150 seconds
Peak Temperature (TP)
260 +0/‑5°C
Time within 5 °C of actual Peak temperature (tP)
20‑40 seconds
Ramp‑down Rate
6°C/second max
Time 25 °C to Peak Temperature
8 minutes max
Note 1: All temperatures refer to topside of the package, measured on the package body surface
SMT Assembly
Reliable assembly of surface mount components is a com‑
plex process that involves many material, process, and
equipment factors, including: method of heating (e.g., IR
or vapor phase reflow, wave soldering, etc.) circuit board
material, conductor thickness and pattern, type of solder
alloy, and the thermal conductivity and thermal mass of
components. Components with a low mass, such as the
SOT package, will reach solder reflow temperatures faster
than those with a greater mass.
Avago’s SOT diodes have been qualified to the time‑tem‑
perature profile shown in Figure 8. This profile is repre‑
sentative of an IR reflow type of surface mount assembly
process.
After ramping up from room temperature, the circuit
board with components attached to it (held in place with
solder paste) passes through one or more preheat zones.
The preheat zones increase the temperature of the board
and components to prevent thermal shock and begin
evaporating solvents from the solder paste. The reflow
zone briefly elevates the temperature sufficiently to pro‑
duce a reflow of the solder.
The rates of change of temperature for the ramp‑up and
cool‑down zones are chosen to be low enough to not
cause deformation of the board or damage to compo‑
nents due to thermal shock. The maximum temperature
in the reflow zone (TMAX) should not exceed 260°C.
These parameters are typical for a surface mount assem‑
bly process for Avago diodes. As a general guideline, the
circuit board and components should be exposed only
to the minimum temperatures and times necessary to
achieve a uniform reflow of solder.


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