# Identifying a diode brand

1. Sep 28, 2015

### Zondrina

Hi everyone,

I'm looking for a metal diode that has a maximum reverse breakdown voltage of about 11.500 V and a turn on voltage of about 0.750 V.

Below is a plot of the reverse linear IV characteristic where the metal diode is marked by an orange dot.

Below that is a plot of the forward linear IV characteristic where the metal diode is again marked by an orange dot.

I suspect the metal diode is some type of 1NXXXX diode, but I am unsure what specific model it is.

I also remember the diode itself was small and grey with a black strip indicating the cathode.

If anyone might know what specific model this diode is, I would love to know.

Thank you.

2. Sep 28, 2015

### jim hardy

3. Sep 28, 2015

### Svein

Then obviously you are looking for a silicon diode / rectifier. Or do you mean a Zener diode? Anyhow, On semiconductor (http://www.onsemi.com/PowerSolutions/home.do) is the successor to Motorola's discretes. I suggest you look there.

4. Sep 28, 2015

### Zondrina

I think the diode is a 1N4737 after looking at some data sheets. I'm still not 100% certain which diode it is though, what would you guys think?

5. Sep 28, 2015

### jim hardy

would you post a link to the datasheet, or snip&paste ?

6. Sep 28, 2015

### Zondrina

Disregard my last post. I think I found a better option:

The closest $V_Z$ would be the 1N5927B, G with a $V_{Z_{min}} = 11.40 V$

7. Sep 28, 2015

### jim hardy

Are you trying to identify it, or find a replacement ?

Datasheets give other clues besides electrical characteristics, and hints for use.

if the one you tested has a metal case it's probably rated a watt or more
your 1N5927 is a 3 watt as you doubtless noted.

Be aware of importance of keeping the leads short on such a device that's going to be operated near its rated power

old jim

8. Sep 28, 2015

### Baluncore

How about a photo of the original diode with dimensions. From that we can identify the package standard and then power rating.
A replacement zenner diode can then be selected from currently available parts.