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Zener Diode ID

R

Ronak Shah

Jan 1, 1970
0
This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....
 
J

John Fields

Jan 1, 1970
0
This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....

Are there stripes around the bodies of the devices?
 
R

Ronak Shah

Jan 1, 1970
0
you can hardly see the stripes.... they are more like blogs of ink
 
N

Nicholas O. Lindan

Jan 1, 1970
0
Ronak Shah said:
Well the problem is they are sooo
tiny and hence I cant read the values

Get a good ~10x magnifying loupe: Things will just get even tinier
and harder to read; Eyesight gets worse as one gets older,
not better.
 
C

CFoley1064

Jan 1, 1970
0
Subject: Zener Diode ID
From: "Ronak Shah" [email protected]
Date: 11/30/2004 8:57 AM Central Standard Time
Message-id: <[email protected]>

This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....

Hi, Shah. No weird questions here. If they're in a glass case, they're
probably either signal diodes or zeners. If they're zeners you can usually
tell the wattage by the size (400mW zeners are smaller than 1W zeners). The
tiny ones are usually the 400mW ones.

One thing you might try is cobbling up a 30V power supply, and putting the
back-biased diodes (Device Under Test, or DUT) in series with an appropriate
resistor. If they're standard diodes, all the voltage will be across the
diode. If they're zeners, there will be a zener voltage across the diode, and
the rest will be impressed across the resistor. Note that this will not be a
good solution for higher voltage zeners (they will look like standard diodes)
or schottky diodes (which can break down at 20V, depending). But, if the
choice is between standard silicon signal diode or low voltage (less than 24V)
zeners, this will give you a pretty good start.

Remember to start with a higher resistance value to avoid smoking the zener,
and after getting an initial indication of zener/avalanche, choose a more
reasonable resistance to test at something like half rated wattage. (power =
volts * current).

___
.--|___|---X----.
| R |
| |
| |
--- DUT -
-30VDC ^
| |
| |
'----------X----'
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de


Good luck
Chris
 
R

Ronak Shah

Jan 1, 1970
0
I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

on the second one:
TFK
1N4 < Not very clear
733 < 7 is clear the rest I guessed from the blur

Now I cant see the numbers clearly.. so I am guessing these numbers... does
anyone recognize these?????
If you do... are these zeners or regular signal diodes??
If not do these numbers resemble anything you might recognize ?

I am kinda new to this.....please advice
 
G

Glenn

Jan 1, 1970
0
Ronak said:
I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

on the second one:
TFK
1N4 < Not very clear
733 < 7 is clear the rest I guessed from the blur

Now I cant see the numbers clearly.. so I am guessing these numbers... does
anyone recognize these?????
If you do... are these zeners or regular signal diodes??
If not do these numbers resemble anything you might recognize ?

I am kinda new to this.....please advice

My guess would be:
1N814B dunno

1N4733
..5 watt 5.1 volt zener


Glenn
 
J

John Popelish

Jan 1, 1970
0
Ronak said:
I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

on the second one:
TFK
1N4 < Not very clear
733 < 7 is clear the rest I guessed from the blur

Now I cant see the numbers clearly.. so I am guessing these numbers... does
anyone recognize these?????
If you do... are these zeners or regular signal diodes??
If not do these numbers resemble anything you might recognize ?

I am kinda new to this.....please advice

This might be useful:
http://www.brive.unilim.fr/geii/electronique/docs/cross_ref_puissance.pdf

This list may give you an equivalent type that you can find on Google.

That said, the second one is a current type and is on this data sheet:
http://www.fairchildsemi.com/ds/1N/1N4744A.pdf
 
B

Bob Masta

Jan 1, 1970
0
This might be the weirdes questen here....
Well I picked up a miex lot of components and it has about 5-6 Zener
Diodes... (thats what i think they are) Well the problem is they are sooo
tiny and hence I cant read the values.. is there a way I can find out the
values? I mean ID the diode....
Now that I think of it... are they even Zener diodes? I know 1N914 comes in
glass case too...
Is there a way I can find out what this is and what values it holds....
A method I use is similar to Chris Foley's, only simpler if you have
a scope. Just put the unknown device in series with a resistor
(100K or so) and connect to the AC output of an appropriate
transformer.

Look at the voltage across the diode and see what it does.
You can see the Zener voltage as a clipped half-sine in
the reverse-bias direction. You can thus read the Zener voltage
right off the scope face. This makes it quick to characterize
lots of unknown parts, including telling which end is which.

Hope this helps!


Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
 
J

Joerg Hau

Jan 1, 1970
0
I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

1N8148. Sounds _almost_ like an 1N4148 (Si universal diode); those in
my stock are labeled in the same fashion.

Cheers + HTH,

- Joerg
 
P

Peter Bennett

Jan 1, 1970
0
I took some advice and got my self the magnifying glass....
well I can see the following digits....
on the first one
1N8
14B
C

I suspect that is a 1N914B - common small-signal diode.
on the second one:
TFK
1N4 < Not very clear
733 < 7 is clear the rest I guessed from the blur

1N4733 is a 5.1 volt zener, 1 watt
 
R

Rich Grise

Jan 1, 1970
0
My guess would be:

.5 watt 5.1 volt zener

I thought 1N814 might be in the 1N74x series of zeners, but Newark doesn't
list it, so I'm guessing 1N914 with a crappy screen.

I agree on the 1N4733.

Cheers!
Rich
 
W

Watson A.Name - \Watt Sun, the Dark Remover\

Jan 1, 1970
0
Rich Grise said:
I thought 1N814 might be in the 1N74x series of zeners, but Newark doesn't
list it, so I'm guessing 1N914 with a crappy screen.

The 1N814 is a silicon signal diode, it is _not_ a zener diode.
According to my Moto manual, PRV=40V, Vf=1.0 @ 2mA, Ir=0.1uA, Trr=.25uS.
 
R

Rich Grise

Jan 1, 1970
0
The 1N814 is a silicon signal diode, it is _not_ a zener diode. According
to my Moto manual, PRV=40V, Vf=1.0 @ 2mA, Ir=0.1uA, Trr=.25uS.
Well, I just took a WAG, as it's apparently a grab-bag, and figured that
the 1N914 would be more likely to show up in a grab-bag. ;-)

Notwithstanding that just because I've never heard of one doesn't mean it
doesn't exist! ;-)

Thanks!
Rich
 
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