Mpd-055 -28 -ol -

Firms like Aircraft Spruce, SkyGeek, Pegasus Auto Racing Supplies, or Applied Industrial Technologies often maintain cross-references for orphan part numbers. Email their technical support with the code and any photos.

After the first MPD-055 -28 -OL event, we assumed a bad solder joint. Reflowed the board. Same fault. Swapped the driver IC. Same fault. It wasn’t until we looked at the gate charge curve on a低温 scope (that’s low-temperature scope — yes, we froze the test gear) that we saw the real culprit: MPD-055 -28 -OL

The bootstrap capacitor’s ESR had tripled below -20°C.
That tiny ceramic cap — rated for -55°C operation — started acting like a resistor at -28°C. The driver couldn’t fully turn off the high-side FET, leading to the -OL flag. Firms like Aircraft Spruce , SkyGeek , Pegasus

Request a catalog from Eaton Weatherhead, Parker Hannifin, Gates, or Swagelok. Their obsolete fitting cross-reference guides are available via customer support. Reflowed the board