FAQ

Technical FAQ

 • Accessories/Gate Drivers • General Semiconductor Information
 • IGBTs • Thyristor & Diode Modules

IGBTs
  What is the FIT rate for (Part Number) a Powerex device?
FIT rate is the number of failures in 1 billion hours of operation (assuming the device has been operated within specified conditions) and is a relative measure of device reliability. Please inquire with the factory for a FIT rate of a specific Powerex Product. Contact Powerex
  Are all Powerex module packages industry standard?
Yes. All Powerex module packages are industry standard.
  How can I test a Powerex power semiconductor to determine if it is still valid?
Usually, one can only determine if the device has failed short using a standard VOM.But the VOM test can only determine if the device is shorted. Other failure modes will not be detected with a VOM. A more comprehensive evaluation requires equipment specifically designed to test power semiconductors.
  What is the Mean Time Between Failure (MTBF)/Mean Time To Failure (MTTF) for the (part number)?
MTBF implies the ability to repair the device. This does not apply to power semiconductors. MTTF, however, does apply and is the reciprocal of FIT. Please contact Powerex for either the MTTF or FIT for a given Powerex Product.
  Why cant I find the datasheet for (part number) on the website?
If a datasheet for a part number is not listed on the web site, the part number may be a proprietary part or a discontinued part. Contact the Powerex sales department for further explanation by calling 724-925-7272 (Option 1) or by submitting an inquiry on this website via the "Contact Powerex/Support" page.
  Why are the resistance readings for this device higher/lower/out of the range of other devices that we have? The technician believes that this means the device is no longer valid.
Using a VOM to determine a bad semiconductor can only estabish if the semiconductor is shorted. A VOM test is basically a leakage current test. The only valid test for leakage current is that used by the manufacturer. This test usually requires that the device rated reverse voltage be applied across the device under rated junction temperature conditions. Note that acceptable devices are those that are less then or equal to the rated leakage current. Therefore, widely varying readings on a VOM test basically means nothing.
  Do Powerex Semiconductors come with terminal/mounting hardware?
Mounting hardware is not provided. In some cases, terminal hardware is provided, depending on the product. Please Contact Powerex for further information.

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