How to spot a refurbished IGBT module before you pay
Practical guide to identifying re-marked and refurbished IGBT modules: marking quality, date codes, base surface, electrical tests and documented origin checks.
High prices and shortages have created a market of refurbished power modules sold as new. For a plant owner the difference is critical: a refurbished module has no stated service life and can fail at any time. Here is how to catch the substitution before dispatch.
1. Marking
Factory marking is laser-etched on the production line — even, consistent depth, resistant to solvents. Re-marking shows paint blobs or uneven engraving under magnification, with traces of surface preparation around the characters. Compare the font with official product photos.
2. Date codes
Ask for photos of date codes and serials of several modules from the same lot: factory lots are sequential, a mix of scattered codes signals a patchwork of pulled parts.
3. Base and terminals
A new base is uniform, with no thermal paste residue, screw scratches or heat rainbow marks. Terminals must be straight, with no solder traces — solder marks almost guarantee the module was desoldered from equipment.
4. Electrical tests
- VCE(sat) should match the datasheet (2 V typical for FF1000R17IE4); elevated values indicate degradation
- Gate leakage growth signals oxide damage
- The built-in NTC sensor must read nominal — an open sensor means the module was opened
5. Documented origin
The most reliable check: ask the supplier for an unpacking and test video of your exact module, serial number visible. Reputable suppliers do it before dispatch on first request. Refusal is itself an answer.
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