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 Post subject: Component identification BF41-00095A
PostPosted: July 16th, 2019, 12:26 
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Joined: February 26th, 2013, 6:58
Posts: 218
Location: Hungary
Hi,
Can someone identify the component marked by the red square in the picture, please? It reads B2, under it is the date code - Y526 (I think).


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 Post subject: Re: Component identification BF41-00095A
PostPosted: July 16th, 2019, 17:35 
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Joined: September 8th, 2009, 18:21
Posts: 12229
Location: Australia
I believe it's an NPN transistor configured as the pass transistor in a linear regulator.

I have attached the relevant diagram from the datasheet for the L7250 SMOOTH motor controller. Normally the motor controller generates the Vio supply, but in your case the MCU appears to have its own internal regulation circuitry.

You should be able to determine whether the transistor is NPN or PNP by way of a diode test between the B-E and B-C junctions.


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L7250_linear_pos_regs.gif
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NPN_transistor.gif
NPN_transistor.gif [ 12.78 KiB | Viewed 1769 times ]

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 Post subject: Re: Component identification BF41-00095A
PostPosted: July 16th, 2019, 19:30 
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Joined: September 8th, 2009, 18:21
Posts: 12229
Location: Australia
I notice that some PCBs use the following transistor at the same location:

2SD2150, Rohm, NPN Low Frequency Transistor, 20V, 3A, 0.2V VCE(sat), marking CF, R = 180-390 hfe:
https://media.digikey.com/pdf/Data%20Sheets/Rohm%20PDFs/2SD2150.pdf

https://www.harddrivesforsale.com/media/catalog/product/cache/1/thumbnail/9df78eab33525d08d6e5fb8d27136e95/7/6/7618cbce-481e-43fe-8371-6cf2bd594361.jpg

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 Post subject: Re: Component identification BF41-00095A
PostPosted: July 17th, 2019, 8:34 
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Joined: February 26th, 2013, 6:58
Posts: 218
Location: Hungary
Thanks fzabkar, now I am digesting the information and looking for a domestic place to buy.


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 Post subject: Re: Component identification BF41-00095A
PostPosted: July 17th, 2019, 17:32 
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Joined: September 8th, 2009, 18:21
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Location: Australia
You don't need to locate the same part. Any number of suitable substitutes exist.

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