# Voltage regulator ID

**URL:** <https://forum.digikey.com/t/voltage-regulator-id/4756>\
**Category:** Integrated Circuits (ICs)\
**Tags:** monolithic-power-systems-inc, power-management-pmic, part-identification\
**Created:** [November 2, 2019, 7:41pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756 "2019-11-02T19:41:14Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Zack\_parts](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@Zack\_parts](https://forum.digikey.com/u/Zack_parts)\
**Post date:** [November 2, 2019, 7:41pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756/1 "2019-11-02T19:41:14Z")

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Hello! I’m trying to identify this voltage regulator, pictured. (I don’t have a schematic, alas.)

It says IF8AC on it and has a footprint of about 1.3x2.8mm.

If it’s any help, the device takes 9vac in. I also measured the pins on this voltage regulator (while it was working, before I bridged it with a probe, hah). Those measurements are also pictured and are 3.3v, 11.6, 7.4, .8, 0, 8.8vdc going clockwise from the upper left.

 ![IMG_0128](https://global.discourse-cdn.com/digikey/original/2X/b/bff3c374fd0bbfdca4ad6b9e6a3c9cd94e0ef086.jpeg)

Thanks much!  
Zack

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**Author:** ![Robert\_Fay](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/robert_fay/32/6529_2.png) [@Robert\_Fay](https://forum.digikey.com/u/Robert_Fay)\
**Post date:** [November 4, 2019, 1:45pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756/2 "2019-11-04T13:45:10Z")

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Hello @Zack_parts

the markings come back to a Monolithic Power Systems part [MP2359DJ-LF-Z](https://www.digikey.com/product-detail/en/monolithic-power-systems-inc/MP2359DJ-LF-Z/1589-1889-1-ND/5292034). The Datasheet calls out the F8. I have requested verification on the remaining portion of the part marking, however, I suspect it is date/lot information.

-Robert

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**Author:** ![Zack\_parts](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@Zack\_parts](https://forum.digikey.com/u/Zack_parts)\
**Post date:** [November 4, 2019, 4:00pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756/3 "2019-11-04T16:00:11Z")

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Thanks Robert!

Do you have any tips in how you found it? Was it largely your experience and having seen something like this before, or is there a way I could identify it next time? My searches of the markings came up empty.

Thanks.  
Zack

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**Author:** ![Robert\_Fay](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/robert_fay/32/6529_2.png) [@Robert\_Fay](https://forum.digikey.com/u/Robert_Fay)\
**Post date:** [November 4, 2019, 4:08pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756/4 "2019-11-04T16:08:22Z")

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Zach,

Often it is just a case of grabbing parts of the markings. In this case searching “regular marking IF8” gave me some hits that I was able to narrow down options. Many times the manufacturers only talk about base markings and nothing to do with Date/Lot or other identifiers. We also have lots of notes in our internal system from years and years of questions that are often a big help in cases like this.

-Robert

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**Author:** ![Zack\_parts](https://avatars.discourse-cdn.com/v4/letter/z/a9a28c/32.png) [@Zack\_parts](https://forum.digikey.com/u/Zack_parts)\
**Post date:** [November 4, 2019, 4:51pm UTC](https://forum.digikey.com/t/voltage-regulator-id/4756/5 "2019-11-04T16:51:42Z")

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Thanks, Robert. I’ll keep searching what I can on my own but appreciate your help when it’s not enough.