Technical Reference Notes
ALD12/18/20/25 Series
(Single Output 16th Brick)
Mechanical Specifications (continued)
1.30 [33.0]
Pin 1
0.90 [22.9]
Pin 8
PIN SIDE DOWN
0.36 [9.0]
0.06 [1.4]
0.18 [4.6]
SIDE VIEW
0.15 [3.8]
0.15 [3.8]
1.10 [27.9]
0.10 [2.5]
0.15 [3.8]
0.30 [7.6]
0.45 [11.4]
0.60 [15.2]
0.30 [7.6]
0.30 [7.6]
PIN SIDE UP
Figure 43B. Mechanical Outline – SMT (Solder Ball) Termination.
SOLDERING CONSIDERATIONS
The through hole terminated converters are
compatible with standard wave soldering techniques.
When wave soldering, the converter pins should be
preheated for 20-30 sec at 110°C and wave soldered
at 260°C for less than 10 sec.
RECOMMENDED REFLOW PROFILE
240
220
200
180
160
140
120
100
80
PEAK TEMPERATURE
200°C - 230°C
183°C
REFLOW
ZONE
When hand soldering, the iron temperature should be
maintained at 425°C and applied to the converter pins
for less than 5 seconds. Longer exposure can cause
internal damage to the converter. Cleaning can be
performed with cleaning solvent IPA or with water.
< 80 sec
110°C
PRE-HEAT ZONE
120 - 180 sec
SLOPE
< 4°C /sec
60
For SMT terminated modules, refer to Figure 44 for
the recommended reflow profile.
40
20
0
0
30
60
90
120
150
180
210
240
270
300
TIME (seconds)
Figure 44. Recommended reflow profile for SMT modules.
MODEL: ALD12/18/20/25 SERIES
AUGUST 17, 2005 – REVISION C
SHEET 19 OF 20
ASTEC [ Astec America, Inc ]
