# E in part number

**URL:** <https://forum.digikey.com/t/e-in-part-number/60378>\
**Category:** Q&A\
**Created:** [September 18, 2025, 6:51pm UTC](https://forum.digikey.com/t/e-in-part-number/60378 "2025-09-18T18:51:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![onlineorders](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@onlineorders](https://forum.digikey.com/u/onlineorders)\
**Post date:** [September 18, 2025, 6:51pm UTC](https://forum.digikey.com/t/e-in-part-number/60378/1 "2025-09-18T18:51:14Z")

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------Question for [AZ979-1A-12DRE](https://www.digikey.com/en/products/detail/american-zettler/AZ979-1A-12DRE/18342174) Please Put your question below------

Hello. What is the “E” for at the end of the part number. My customer asked for AZ979-1A-12DR so I want to be sure I’m offering something compatible. Thank you.

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**Author:** ![anthony\_14117](https://avatars.discourse-cdn.com/v4/letter/a/6a8cbe/32.png) [@anthony\_14117](https://forum.digikey.com/u/anthony_14117)\
**Post date:** [September 18, 2025, 8:16pm UTC](https://forum.digikey.com/t/e-in-part-number/60378/2 "2025-09-18T20:16:22Z")

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Hello @onlineorders

Welcome to the TechForum

The “E” in part number [AZ979-1A-12DRE](https://www.digikey.com/en/products/detail/american-zettler/AZ979-1A-12DRE/18342174?s=N4IgTCBcDaIIIC0CcB2JBaAjHLYAiASgKIgC6AvkA) is calling out epoxy sealed.