Author Topic: Identify SMD chip (SOT-23-6) "7A50a"  (Read 893 times)

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Offline technogeeky

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Identify SMD chip (SOT-23-6) "7A50a"
« on: March 24, 2018, 06:27:15 am »
Hello,

I accidentally broke (at least) this chip on a small wind/temperature/433MHz sensor module (though the power consumption was horrid before I broke it).

As far as I can tell, the package is SOT-23-6.

The VCC comes from two D battery cells, so VCC_max is going to be 3.0 volts or so. It seems to stop functioning at around 1.85 volts, so VCC_min is somewhere around 1.85 volts.

The part number is 7A50a.

The part is connected directly to the battery via pin 6.
The part is connected to the battery through an inductor via pin 5.
Pin 4 is used by the micro (labeled CLCK1).
Pin 3 is a test point.
Pin 2 is connected directly to ground.
Pin 1 is connected to a "J26.000" (26 MHz) crystal oscillator.

 

Offline stj

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #1 on: March 24, 2018, 11:54:23 am »
the only "7A" reference in my databook is this:
 

Offline technogeeky

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #2 on: March 24, 2018, 07:06:12 pm »
the only "7A" reference in my databook is this:

Thanks for the attempt. I don't think that can be it. I don't know how two transistors would work in that situation (though I'm not sure what is going on anyway).

Plus, that package is too large, I think.
 

Offline amyk

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #3 on: March 25, 2018, 03:13:16 am »
 
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Offline technogeeky

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #4 on: March 25, 2018, 06:05:34 am »
CMT2117A.

That looks perfect! Thanks very much. Can I ask what tools or resources you used, or doth the magician keep his secrets hidden up his sleeve?
 

Online BravoV

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #5 on: March 25, 2018, 06:15:08 am »
CMT2117A.

That looks perfect! Thanks very much. Can I ask what tools or resources you used, or doth the magician keep his secrets hidden up his sleeve?

Amyk does have magnificent magic on identifying SMD components.  :-+

Helped me -> HERE too while ago, and on many other occasions here.  :clap:
« Last Edit: March 25, 2018, 10:33:28 am by BravoV »
 

Offline amyk

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Re: Identify SMD chip (SOT-23-6) "7A50a"
« Reply #6 on: March 25, 2018, 05:26:15 pm »
Just Googled it... the 26MHz oscillator connection seems distinctive so I searched "sot23-6 7A 26MHz" and found CMT2119A, which seemed close enough but from its marking scheme (9Axxx) guessed CMT2117A and it was the exact match.

 


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