GE Industrial Solutions KHHD004A2B Hammerhead Series - Manual (Page 11)

GE Data Sheet
KHHD004A2B Hammerhead™ Series; DC-DC Converter Power Modules
18-75Vdc Input; 12.0Vdc, 4.2A, 50W Output
April 1, 2013 ©2012 General Electric Company. All rights reserved. Page 11
Surface Mount Information (continued)
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 Figure 22.
Figure 22. Recommended linear reflow profile using
Sn/Ag/Cu solder.
MSL Rating
The KHHD004A2B series SMT modules have a MSL rating of 2a.
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).
Pe r J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
R
efl
o
w
T
em
p
(°
C
)
Heating Zone
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone