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http://www.digikey.com/product-search/compare/en?returnUrl=%2Fproduct-search%2Fen%3FFV%3D90c000e%26k%3DGDT%2B500V%2B20%2525%2B5KA%2BTHROUGH%2BHOLE%26mnonly%3D0%26newproducts%3D0%26ColumnSort%3D-1000011%26page%3D1%26stock%3D0%26pbfree%3D0%26rohs%3D0%26quantity%3D%26ptm%3D0%26fid%3D0%26pageSize%3D25&part=495-1476-ND&part=GTCA26-501M-R05-ND

We are looking at protection for our new design. Upon doing BOM reduction exercises we discovered EC90X gas discharge tubes are $1.79 (Digikey Part Number 495-1476-ND). The ones marked new are $.50 and spec'd the same (Digikey Part Number GTCA26-501M-R05-ND). Can anyone find reasons why not to go to the 50 cent ones?

We also parallel a TVS SMAJ51CA in with the gas discharge tube.

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Jeff
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  • A Digikey comparison is the 50,000 ft. view. Compare the datasheets to be sure they're the same. They're probably just two competing products. – Matt Young Aug 20 '15 at 15:59
  • Agreed and in the process. I couldn't attach the files to here. Or can I?? – Jeff Aug 20 '15 at 16:08
  • Anyway, just looking for experts and more of the community to chime in on the datasheets also! – Jeff Aug 20 '15 at 16:08

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I would be concerned because the datasheet that digikey points to says 90V DC spark-over while digikey's description says 90V for the EPCOS device. So if we go based on the datasheet for the EPCOS component and compare it to the TE that you show the DC spark-over is now 500V which means that your device might have to withstand the higher voltage. However, in the same TE datasheet it shows the GTCX26-900M-R05 part with an 90V DC spark-over that might be more appropriate. At this point I would contact EPCOS and Digikey and find out the actual DC spark-over voltage device since there seems to be a discrepancy.

Kvegaoro
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