Smd chip identification marked L5B .MESC5V02BD03_SOT23-3

[mentofenol]

Hello!
I have an Acer motherboard with a chip i can not find equivalent, its a MESC5V02BD03_SOT23-3 which has inscrit on it L5B.
Could somenone help me find a compatible or equivalent one?
Which kind of component might be this?
Thank you in advance.

[mon2]

Re: Smd chip identification

This is a common jellybean part. This is a bidirectional dual ESD diode to protect 5 volt signal lines in a sot23 package. It can be replaced by many others.

From where do you like to purchase your parts?

Was this part near your USB connector?

Correction: the MESC5V02BD03_SOT23-3 is a unidirectional dual ESD diode. That is, the part will only allow for positive voltage to pass through and will immediately block negative voltage. If the line goes above 5 volts in the positive side, this diode will shunt the voltage to ground. Summary: dual lines will be protected from transient surges beyond 5 volts. The electronic symbol (bidirectional) shown in your post is not matching this part which should be unidirectional.

[mon2]

Re: Smd chip identification

https://www.digikey.ca/en/products/d...RoC8xMQAvD_BwE

https://canada.newark.com/bourns/cds...oss_price=true

[mentofenol]

Re: Smd chip identification

Hi mon2,
first of all thank you for your precious help and explanation. In fact this part is near the RJ45 lan connector. (i attach a piture of it on the red square)
I have some other faulty laptop boards, which i can try to find those equivalent parts you mentioned, maybe i can find something.
Meanwhile i found the memory slot and KB9052Q-D chip have some pins with corrosion, thats a diferent level of repair i might try to do, dont know if with sucess.
The pins on motherboard seem they are compromised, if so, thats maybe the end of it

Thank you, appreciate very much your help.