# On Semi ICs, 1G vs 3G Suffixes: What's the Difference? **URL:** \ **Category:** Discrete Semiconductor Products\ **Tags:** part-numbering, diodes, onsemi\ **Created:** [March 13, 2025, 3:18pm UTC](https://forum.digikey.com/t/on-semi-ics-1g-vs-3g-suffixes-whats-the-difference/52648 "2025-03-13T15:18:59Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![raelynn.roen](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/raelynn.roen/32/46693_2.png) [@raelynn.roen](https://forum.digikey.com/u/raelynn.roen)\ **Post date:** [March 13, 2025, 3:18pm UTC](https://forum.digikey.com/t/on-semi-ics-1g-vs-3g-suffixes-whats-the-difference/52648/1 "2025-03-13T15:18:59Z")
When searching for ON Semiconductor components, you may run across the same device marked with one of two different suffixes - 1G, as per [MBR140ESFT1G](https://www.digikey.com/en/products/detail/onsemi/MBR140ESFT1G/5257628), or 3G as per [MBR140ESFT3G](https://www.digikey.com/en/products/detail/onsemi/MBR140ESFT3G/5257127). What do these suffixes call out? Are these parts interchangeable? ![ON Semiconductor part number MBR140ESFT1G](https://global.discourse-cdn.com/digikey/original/3X/b/a/ba80ff1b6f1b42cff6c8a8b0d7c41cd5bcba2779.jpeg) The IC is exactly the same in both these cases, and are 100% interchangeable on your board. ‘1G’ and ‘3G’ are packaging suffixes, with 1G calling out a 3k-piece 7" reel and 3G calling out a 10k-piece 13" reel. Once off the reel, there’s no difference at all between the products. ---
**Author:** ![dillon.phillips](https://avatars.discourse-cdn.com/v4/letter/d/35a633/32.png) [@dillon.phillips](https://forum.digikey.com/u/dillon.phillips)\ **Post date:** [April 8, 2026, 4:20pm UTC](https://forum.digikey.com/t/on-semi-ics-1g-vs-3g-suffixes-whats-the-difference/52648/2 "2026-04-08T16:20:40Z")
That is exactly it! Once they are off the reel, they are the same.