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CWP347 Datasheet(PDF) 3 Page - IXYS Corporation

Part # CWP347
Description  Rectifier Diodes & FRED
Download  22 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

CWP347 Datasheet(HTML) 3 Page - IXYS Corporation

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IXYS reserves the right to change limits, test conditions and dimensions
General Informations for Chips
When mounting Power Semiconductor chips to a header, ceramic substrate or hybrid thick film circuit, the solder system and the chip
attach process are very important to the reliability and performance of the final product. This brochure provides several guidelines
that describe recommended chip attachment pro-cedures. These methods have been used successfully for many years at IXYS.
Available forms of chip packings
IXYS offers various options.
Please order from one of the following possibilities:
Packaging Options
Delivery form
C-...*
Chips in tray (Waffle Pack);
Electrically tested
T-...*
Chips in wafer, unsawed;
Bipolar = 5" (125 mm
∅) wafer; Electrically tested, rejects are inked
W-...*
Chips in wafer on foil, sawed;
Bipolar = 5" (125 mm
∅) wafer; Electrically tested, rejects are inked
...* must be amended by the exact chip type designation.
Packing, Storage and Handling
Chips should be transported in their original containers. All chip transfer to other containers or for assembly should be done only with
rubber-tipped vacuum pencils. Contact with human skin (or with a tool that has been touched by hand) leaves an oily residue that may
adversely impact subsequent chip attach or reliability.
At temperatures below 104
°F (40°C), there is no limitation on storage time for chips in sealed original packages. Chips removed from
original packages should be assembled immediately. The wetting ability of the contact metallization with solder can be preserved by
storage in a clean and dry nitrogen atmosphere.
The IGBT and MOSFET Chips are electrostatic discharge (ESD) sensitive. Normal ESD precautions for handling must be observed.
Prior to chip attach, all testing and handling of the chips must be done at ESD safe work stations according to DIN IEC 47(CO) 701.
Ionized air blowers are recommended for added ESD protection.
Contamination of the chips degrades the assembly results.Finger prints, dust or oily deposits on the surface of the chips have to be
absolutely avoided.
Rough mechanical treatment can cause damage to the chip.
Electrical Tests
The electrical properties listed in the data sheet presume correctly assembled chips. Testing of non-assembled chips requires the
following precautions:
- High currents have to be supplied homogeneously to the whole metallized contact area.
- Kelvin probes must be used to test voltages at high currents
- Applying the full specified blocking or reverse voltage may cause arcing across the glass passivated junction termination, because
the electrical field on top of the passivation glass causes ionization of the surrounding air. This phenomenon can be avoided by using
inert fluids or by increasing the pressure of the gas surrounding the chip to values above 30 psig (2 bars).
General Rules for Assembly
The linear thermal expansion coefficient of silicon is very small compared to usual contact metals. If a large area metallized silicon
chip is directly soldered to a metal like copper, enormous shear stress is caused by temperature changes (e.g. when cooling down from
the solder temperature or by heating during working conditions) which can disrupt the solder mountdown.
If it is found that larger chips are cracking during mountdown or in the application, then the use of a low thermal expansion coefficient
buffer layer, e.g. tungsten, molybdenum or Trimetal®, for strain relief should be considered. An alternative solution is to soft-solder these
larger chips to DCB ceramic substrates because of their matching thermal expansion coefficients.
Chip-Shortform2004.pmd
26.10.2004, 12:44
3


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