# identifying a SMD chip: A44 66P2

I have a handful of these chips and I'm trying to figure out what they are. This post links to two sites, smdcode and s-manuals. The former is dead and the latter only classifies A44 as perhaps a transistor. Google wasn't helpful either. Can you help out?

The two lines of codes are just A44 and 66P2. No logo. It has 8 pins total.

Blurry pic below. Since it's so generic/unbranded I don't think digging out the fancy camera gear changes anything. Body dimensions are 3.1 x 2.8 x 0.86 mm.

• Can you add a picture of it? What is the package? – Ron Beyer Oct 14 '17 at 18:16
• It's just a SO-8. I can add a pic but it's very generic. – tedder42 Oct 14 '17 at 18:23
• @tedder42 - "It's just a SO-8" The new information that it's an SO-8 is helpful, as it eliminates a possibility I was considering, which has an A44 marking but only on a much smaller type of 8-pin package, and not on it's SO-8 (SOIC-8) package. If these ICs are not soldered to PCB (where we could get at least an idea about their possible function by looking at the connections to nearby components), then it's more difficult to identify them. P.S. Now you've added a photo & dimensions, that doesn't look like an SO-8 (it's too small) - more like an MSOP-8. Good luck! – SamGibson Oct 14 '17 at 18:36
• You're right, SO is too big. I have a few dozen of them on tape, no context. – tedder42 Oct 14 '17 at 18:37

One possible match is the OPA2244 op-amp from TI (was Burr-Brown) - or a counterfeit clone version of it.

According to its datasheet, it is available in the MSOP-8 package and that package would have top mark A44 (with TI saying that there "may be additional marking", which could explain the second line).

TI refer to the MSOP-8 package as VSSOP and you see it as package code DGK in the datasheet.

(Excerpt from TI datasheet, edited to fit screen width, confirming A44 top mark for OPA2244 op-amp in that package)

As you may know, there are counterfeit versions of some other Burr-Brown op-amps. I haven't seen a genuine example in an MSOP-8 package, so I can't say whether your package markings look genuine or not.

Of course, as discussed in the earlier comments, without having any context to examine from the device being "in-circuit", this might be completely the wrong device identifier for your component. If you can afford to sacrifice one of them in the name of testing, you could solder one to a breakout board as if it's an OPA2244, add suitable support components and give it a try :-)

Update:

Bruce Abbott kindly found a very similar image to the photo in the question, from a seller on Alibaba who claims to be selling OPA2244 op-amps:

Source

This adds further evidence that the combination of those markings, on that package, could be OPA2244 op-amps (or a clone).

• sc02.alicdn.com/kf/HTB1VsoPNpXXXXb8XXXX760XFXXX6/… – Bruce Abbott Oct 14 '17 at 22:26
• @Bruce - Thanks Bruce, good find! Since that image is from Alibaba, I'm not sure that the ICs are genuine :-) However the seller claims they are OPA2244 op-amps and the markings look very similar, so it's further evidence that the OP's devices might indeed be that op-amp. I'll update my answer to include that image. Thanks again for finding it! – SamGibson Oct 14 '17 at 22:40
• Counterfeit? There's no marking suggesting they were made by BB or TI. The word is clone. – Passerby Oct 17 '17 at 1:20
• @Passerby - Thanks. The counterfeit Burr-Brown op-amps I remember were in a larger package and did have a fake BB or TI logo. However I couldn't find any evidence that even a genuine TI OPA2244 in MSOP-8 would have their logo on the top (lack of space?). Therefore, until we know what a genuine device of that type in that package looks like, I don't know if we can tell the difference between a genuine part, or one which is pretending to be a TI original, but isn't. Anyway, I'm happy to use "clone" - as long as the possibility that they might not be the original device is mentioned. Thanks! – SamGibson Oct 17 '17 at 1:36