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Offline MrWizerdTopic starter

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Mystery transistor
« on: October 01, 2015, 03:02:42 am »
Ok I have a Transistor based on measurements is in a SOT23 case the main making is 1B but there are two markings on the sides, a p and after a p8 I think but it is 90 degrees turned from the main 1B.  If those markings are insignificant it is a  BC856B NPN transistor.  I attached a picture from my phone through  a loop with a flashlight shining on it.

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Offline Mr.B

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Re: Mystery transistor
« Reply #1 on: October 01, 2015, 03:14:56 am »
Firstly a BC856B is a PNP transistor, not an NPN.
Taiwan Semiconductor, Diodes Incorporated, Infineon Technologies, Fairchild Semiconductor and NXP Semiconductors all have 3 character markings for their BC856B, none of which are "1B"

It appears to be a Vishay BC846B.

What is your mystery?

Edit: Spelling.
« Last Edit: October 01, 2015, 03:19:26 am by Mr.B »
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Offline MrWizerdTopic starter

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Re: Mystery transistor
« Reply #2 on: October 01, 2015, 05:33:31 am »
Sorry, was paying from my phone and the first one on this list http://www.s-manuals.com/smd/1b is the bc846b like you said.  My mystery comes in the form of the extra characters.  If it had just the 1B I would call it good but the two on the right are P8 by my eyes and want sure if these were significant or not.

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Offline MrWizerdTopic starter

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Re: Mystery transistor
« Reply #3 on: October 01, 2015, 05:36:02 am »
That site shows the  1BP as the bc846b NPN by nxp. This is the confusion I'm having sorry couldn't edit previous post from tap talk

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Offline Mr.B

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Re: Mystery transistor
« Reply #4 on: October 01, 2015, 06:27:32 am »
The important thing is the "1B".
The other markings may be batch/date codes...

I would suggest it is a Vishay BC846B.
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