what does it mean ?

Parts Questions
1

on my zener diode is written : “1N_47_33A_821” does this mean its a 8.2v ??

on my other zener diode is written : “1N_47_38A_604” what does it mean  ??

this is crucial because ALL my voltage measures on the JDMprog are oh-so-wrong !!

2

Hi,

the 1N4733 (A821) is a 5.1V zener

the 1N4738 (A604) the 8.2V zener

(I used google to find the specs)

Take care for the polarity of the diodes!

Best Regards, Thorsten.

3

Happy New Year All!

The 1N4733 is 5.1v, and the 1N4738 is 8.2v.

The extra numbers at the end (821, 604) could be batch numbers, date codes, internal manufacturers ID’s, etc.

There is a pdf datasheet that shows the relationship between the part number and the voltage for all 1 watt zeners here:

http://www.glencoe.com/ps/bsee/pdf/1N4733.pdf

Since this is my first post I need to say thanks to Thorsten for making such a cool project public, the community of builders here is such a rare find on the internet wasteland these days. ;D

4

THANK YOU VERY MUCH !!

are those good for the JDMprog ??

1 Like
5

are those good for the JDMprog ??

Yes!

I used a 1N4733 and a 1N4738 in my JDM programmer, and I have a working core module using PICs written on it.

Also don’t worry about the “A” on the end of the part number, a 1N4733 and a 1N4733A interchange in this design.

;D