Technical Reference Notes

ALD12/18/20/25 Series

(Single Output 16

MODEL: ALD12/18/20/25 SERIES

SHEET 19 OF 20

AUGUST 17, 2005 – REVISION C

Mechanical Specifications (continued)

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.

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.

For SMT terminated modules, refer to Figure 44 for

the recommended reflow profile.

Figure 44. Recommended reflow profile for SMT modules.

RECOMMENDED REFLOW PROFILE

0

20

40

60

80

100

120

140

160

180

200

220

240

0

30

60

90

120

150

180

210

240

270

300

TIME (seconds)

PRE-HEAT ZONE

120 - 180 sec

REFLOW

ZONE

< 80 sec

110

°°°°C

183

°°°°C

PEAK TEMPERATURE

200

°°°°C - 230°°°°C

SLOPE

< 4

°°°°C /sec

0.06 [1.4]

0.30 [7.6]

0.30 [7.6]

0.10 [2.5]

0.15 [3.8]

0.90 [22.9]

0.36 [9.0]

0.60 [15.2]

0.45 [11.4]

0.15 [3.8]

0.30 [7.6]

0.15 [3.8]

1.10 [27.9]

PIN SIDEDOWN

PIN SIDEUP

0.18 [4.6]

SIDEVIEW

1.30 [33.0]

Pin 1

Pin 8