Surface mount information, Through-hole lead-free soldering information – GE Industrial Solutions EQW006 Series User Manual

Page 18

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Data Sheet

July 27, 2011

EQW006 Series, Eight Brick Power Modules: DC-DC Converter

36 – 75Vdc Input; 12Vdc Output; 6A Output Current

LINEAGE

POWER

18

Surface Mount Information

(continued)

M

A

X

T

E

M

P

SOLDER (

C)

200

205

210

215

220

225

230

235

240

0

10

20

30

40

50

60

Figure 19. Time Limit Curve Above 205

o

C for

Tin/Lead (Sn/Pb) process.

Lead Free Soldering

The –Z version of the EQW006 modules are lead-free
(Pb-free) and RoHS compliant and are both forward
and backward compatible in a Pb-free and a SnPb
soldering process. Failure to observe the instructions
below may result in the failure of or cause damage to
the modules and can adversely affect long-term
reliability.

Pb-free Reflow Profile

Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. This standard provides a recommended
forced-air-convection reflow profile based on the
volume and thickness of the package (table 4-2). The
suggested Pb-free solder paste is Sn/Ag/Cu (SAC).
The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in Fig. 20.

MSL Rating

The EQW006 modules have a MSL rating of 2.

Storage and Handling

The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow
Sensitive Surface Mount Devices). Moisture barrier
bags (MBB) with desiccant are required for MSL
ratings of 2 or greater. These sealed packages
should not be broken until time of use. Once the
original package is broken, the floor life of the product
at conditions of

 30°C and 60% relative humidity

varies according to the MSL rating (see J-STD-033A).

The shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90%
relative humidity.

Post Solder Cleaning and Drying
Considerations

Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Lineage Power Board
Mounted Power Modules: Soldering and Cleaning

Application Note (AN04-001).

Per J-STD-020 Rev. C

0

50

100

150

200

250

300

Reflow Time (Seconds)

R

efl

o

w

T

em

p

C

)

He ating Zone

1°C/Second

Peak Temp 260°C

* Min. Time Above 235°C
15 Seconds

*Time Above 217°C

60 Seconds

Cooling

Zone

Figure 20. Recommended linear reflow profile
using Sn/Ag/Cu solder.

Through-Hole Lead-Free Soldering
Information

The RoHS-compliant through-hole products use the
SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant
components. They are designed to be processed
through single or dual wave soldering machines. The
pins have an RoHS-compliant finish that is compatible
with both Pb and Pb-free wave soldering processes.
A maximum preheat rate of 3

C/s is suggested. The

wave preheat process should be such that the
temperature of the power module board is kept below
210

C. For Pb solder, the recommended pot

temperature is 260

C, while the Pb-free solder pot is

270

C max. Not all RoHS-compliant through-hole

products can be processed with paste-through-hole
Pb or Pb-free reflow process. If additional information
is needed, please consult with your Lineage Power
representative for more details.



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