a diode with T3 mark

[ET200]

hi friends,
I can't find what is this diode. it has mark T3. with diode mode test in forward bias drop 0.5v and in reverse bias is open. I thought it's a zener diode and i put it on a circuit with 30 volts reverse bias but, it didn't on.
thanks for your help.

 

[stenzer]

Hi,

what do you mean by

but, it didn't on.

• Have you applied the voltage directly to de diode?
• Have you measured the current throug the diode?
• Have you placed a resistor in series and applied the 30 V across this series configuration, and measured the reverse diode voltage drop?

BR

 

[ET200]

Hi,

what do you mean by

• Have you applied the voltage directly to de diode?
• Have you measured the current throug the diode?
• Have you placed a resistor in series and applied the 30 V across this series configuration, and measured the reverse diode voltage drop?

BR

hi, I've placed a resistor in series and applied the 30 V across this series configuration, and measured the reverse diode voltage drop. in addition, current was zero.
thanks

 

[FvM]

You have checked that the device is no Z-diode with less than 30V breakdown voltage, it can be still a higher voltage Z-diode or simply a small signal switch/rectifier like 1N4148.

Marking codes are unfortunately vendor specific. Most through hole parts are marked with full part number, I'm not aware of a marking code list for through hole parts, except vendor documents that are showing the exact marking format including date code.