TVS Diode

[Satboy]

I am trying to identify the part in the photo below market TX8FGS7, I believe its a TVS diode. I have looked online but can't find a data sheet or equivalent could anyone offer and advice on a UK supplier, data sheet or equivalent.

David..

 

[Bill_P]

Looks like a Littelfuse logo. It might be one of the devices in the link.
https://www.littelfuse.com/products/tvs-diodes/surface-mount.aspx

 

[johnnyx]

You can see the manufacturer's logo "LF" for Littlefuse.

I guessed that the package size is "SMA", which is common, and the smallest of SMA, SMB, SMC.

There is no polarity marking band that a normal diode has, so it's bi-directional.

I Googled "SMA TVS marking code XT"

Google produced the Littlefuse datasheet amongst which was "SMAJ18CA", an 18v bi-directional TVS in an SMA package. Oh, and its marking code is XT.

 

[Satboy]

Thanks for the reply, Just looked the link above and I believe that's what im looking for....

Thanks
David.

 

[johnnyx]

You will find SMAJ18CA in RS or Farnell online stores.

 

[Satboy]

How do I test this device as i'm getting a voltage drop both way.

 

[johnnyx]

They usually fail short-circuit. If it's high resistance both directions then it's ok.