Decoding SMD package markings

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schtevo
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Posted by schtevo: Wed. Aug 9, 2017 - 01:42 AM
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Hi Guys,

 

I've been doing a little bit of reverse engineering and I find myself stuck on a part I cannot seem to identify.

Its a SOT-23-5 with A63A etched on the top.

I have tried a few SMD code apps/sites but they lead me to some voltage detector ICs and some little DC-DC switchers.  Neither of these make any sense in the context of the design. There are only passive peripheral components (R & C, no L).

 

So does anyone have an idea or some "go-to" SMD code websites they could share?

 

Thanks,

Steve.

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Learning and Information, General Electronics
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awneil
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Posted by awneil: Wed. Aug 9, 2017 - 08:30 AM
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There is no universal standard for this; it is all manufacturer-specific - possibly even product-specific for different products from the same manufacturer.

 

And, if it's a high-volume product, the markings might actually be custom to the product manufacturer ...

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schtevo
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Posted by schtevo: Sun. Aug 13, 2017 - 09:25 AM
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Yeah that's true of course. Just hoping someone might have a lead or another index site to check.

 

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Brian Fairchild
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Posted by Brian Fairchild: Sun. Aug 13, 2017 - 09:41 AM
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schtevo wrote:

Its a SOT-23-5 with A63A etched on the top.

 

The LM321, which is an op-amp has that code.

 

I've just reverse engineered a board myself with similar problems. What I find helps is having a stab at what the component might be, based on where it is in the circuit, and putting that in the search term.

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El Tangas
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Posted by El Tangas: Sun. Aug 13, 2017 - 10:51 AM
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At first, I was only getting voltage regulators too cheeky

 

Here is a site that finds the LM321. Might be useful to complement the other sites.

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schtevo
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Posted by schtevo: Mon. Aug 14, 2017 - 03:40 AM
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Well whatdiya know - LM321 fits the bill nicely.  I had anticipated an op-amp but could NOT get it to fit the circuit topology.  Seems there's another SOT23-5 pinout I didn't have in my library.

 

Thanks for the part and new web link guys.

 

Cheers,

Steve

 

* added "NOT" . Ross *

 

Last Edited: Mon. Aug 14, 2017 - 06:42 AM
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