Mini-MELF Diode:

[Mad Professor]

Hi All.

This is the 1st time I have had any dealing with Metal Electrode Leadless Face (MELF) components.

I think the component is a Mini-MELF Zener Diode. the only markings is a single blue band at one end.

I am trying to find details for a component that I think has failed or partly failed.
I think this diode is faulty as it seems to be pulling a signal rail up, but not fully.
With the diode removed the signal rail is at 0v, but with the diode in place it's at 12.6v, the supply rail is 28.8v.
The signal rail is between the output of a CNY17 Optocoupler and the gate of a BUZ10 Power MOSFET.

Thanks for your time.

Best Regards.

[GBowes]

A little more information might be helpful if you want people to help.
I started to make some comments but there is really too little to go on.
Can you post a schematic at least of the connections to the opto outputs, the MELF in question, and the Mosfet gate and showing the supply rail and the "signal "rail

Hi All.

This is the 1st time I have had any dealing with Metal Electrode Leadless Face (MELF) components.

I think the component is a Mini-MELF Zener Diode. the only markings is a single blue band at one end.

I am trying to find details for a component that I think has failed or partly failed.
I think this diode is faulty as it seems to be pulling a signal rail up, but not fully.
With the diode removed the signal rail is at 0v, but with the diode in place it's at 12.6v, the supply rail is 28.8v.
The signal rail is between the output of a CNY17 Optocoupler and the gate of a BUZ10 Power MOSFET.

Thanks for your time.

Best Regards.