Identification of electronic components

[enea]

identification of electronic components

Hi,
I'm analyzing the circuit shown in the image and I need to recognize the 3 marked elements. The T27I is a diode but I have no idea of the manufacturer. The other two components have a SOT23 package and are marked with A7 9(rotated of 90°) and W9C 70(rotated of 90°) respectively.
Can someone help me identify this components?

Thank you
Enea

 

[kender]

identification of electronics components

Enea,

I don't know how to help you with identification.

I'm curious - what's the purpose of your board? Is the the diode-capacitor "ladder" on the lower right a high-voltage supply?

Cheers,
- Nick

 

[enea]

w9c cpacitor

It is a gate driver unit for 6.5kV IGBTs. On the lower left there is a "big" voltage divider needed to measure the voltage between collector and emitter.
I found some of the components looking at SMD marking code databases, but I couldn't find everything.

 

[wayudz]

Hi,
Check markingcodes' original type no is our major job.Welcome to join our gold member.
The markingcode promblem you post, i checked them for you.see below:
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A7 BAV99LT1 SOT23 Diode-Switching Diode,(dual,se ... ON/
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W9C PLVA656A SOT23 Low-voltage avalanche regulato ... PHI -----------------------------------------------------------------------------------------


David
I'm one of EDAboard!
david@smdok.com
https://www.smdok.com
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