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I have stumbled upon this mystery chip, it is probably a voltage regulator. It is inside a projector I want to repair. From what I gather, it's probably a 1.8 volt regulator.

If you can confirm please go ahead. The package is SOT-223.

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  • \$\begingroup\$ Week 17 2018? Dead already? \$\endgroup\$ Apr 6, 2022 at 20:51

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Dii is the logo for Diodes Incorporated.

At first, "4aG" looks like a possible SMD marking code as this shows several 1.8V regulators, but none by DI. Checking DI datasheets, it looks more like "17-18" is the device marking, "18" being 1.8V and "17" being the model. The only DI datasheet I could find which shows this naming format is this one page 10:

AP7363 Datasheet

So it is definitely a DI linear regulator, 1.8V, model "17", in a SOT-223 package. But none of the models ending in *17 have a datasheet which matches this marking.

Could be that the device was custom-made or is outdated, relabeled, etc.

Chances are good the 63-18 could be an equivalent, but you'll want to make sure the pins are in the same order first of course.

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  • \$\begingroup\$ that matches what I have found so far so thank you \$\endgroup\$ Apr 6, 2022 at 22:11
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I'm unsure about the first two or three symbols. Looks like an incomplete "DH" or something. But the 17-18 on the second row is at least a little familiar. Onsemi uses that for an obsolete 1.8V regulator with part number NCP1117ST18T3.

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