IR Reflow Soldering
Figure 27 is a straight-line
representation of the recom-
mended nominal time-tempera-
ture profile from JESD22-A113-B
IR reflow.
235
200
183
150
60 to 150s
above 183°C
100
50
0
30
Preheat
Zone
60
90
Soak
Zone
120
150
180
210
TIME (seconds)
Reflow
Zone
240
270
300
Cooling
Zone
Figure 27. Time-temperature Profile for IR Reflow Soldering Process.
Table 2. IR Reflow Process Zone.
Process Zone
Preheat Zone
Soak Zone
Reflow Zone
Cooling Zone
∆Temperature
25°C to 100°C
100°C to 150°C
150°C to 235°C (240°C MAX)
235°C to 150°C
150°C to 25°C
∆Temperature/∆Time
3°C/s MAX
0.5°C/s MAX (120s MAX)
4.5°C/s TYP
-4.5°C/s TYP
-6°C/s MAX
Table 3. Classification Reflow Profiles.
Convection or IR/Convection
Average ramp-up rate (183°C to peak)
3°C/second max.
Preheat temperature 125 (± 25)°C
120 seconds max.
Temperature maintained above 183°C
60 – 150 seconds
Time within 5°C of actual peak temperature
10 – 20 seconds
Peak temperature range
220 +5/-0°C or 235 +5/-0°C
Ramp-down rate
6°C/second max.
Time 25°C to peak temperature
6 minutes max.
Note:
All temperatures measured refer to the package body surface.
20