Zener Diode ID

Are there stripes around the bodies of the devices?

--
John Fields

in

"Ronak Shah" wrote

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.

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Nicholas O. Lindan, Cleveland, Ohio
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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:

Glenn

This might be useful:

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:

--
John Popelish

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

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

Cheers + HTH,

- Joerg

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joerg dot hau at swissonline dot ch * Lausanne, Switzerland
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I suspect that is a 1N914B - common small-signal diode.

1N4733 is a 5.1 volt zener, 1 watt

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Peter Bennett VE7CEI 
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can

numbers...

these

doesn't

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.