Help identifying glass diode?

[legg]

On Wed, 7 Jul 2004 06:36:43 -0700, DaveC <me@privacy.net> wrote:

On Tue, 6 Jul 2004 23:53:47 -0700, Clint Sharp wrote
(in article <R2PF3qC7356AFwbN@clintsmc.demon.co.uk&gt:


I'm no electronics professional, but mW rating is maximum power dissipation.
I think I could use a 10W device here and I'd still get 18v out of it, no? I
leave the "pushing enough current" to the circuit designers.

Replace using as similar a device as is possible.

A 400mW device will fail reliably and predictably, under single fault
abnormal conditions, as determined by the designer and relevant safety
agencies.

Other higher powered devices may not.

RL

 

[legg]

On Wed, 7 Jul 2004 06:32:02 -0700, DaveC <me@privacy.net> wrote:

On Wed, 7 Jul 2004 02:35:05 -0700, legg wrote
(in article <bngne0d61uqpj486b53g60hkc3fj5pr7a3@4ax.com&gt:

So its a BZX55C18 (BZX79C18) or similar 18V 400mw(500mW) zener.

Fairchild semi's data sheet now in hand.

You have not reported on impedance measurements of the part's vacant
position, or the disonnected part.

Diode is shorted in both polarities. Vacant position is relatively high
impedance (10K ohms).

You should now check the power device to ensure continuity on it's
terminals, through the device, and svice function, if possible.

The terminal connecting to the shorted zener location has likely gone
open circuit internally, unless another series element has done so
first.

RL

 

[Franc Zabkar]

On Tue, 6 Jul 2004 22:54:33 -0700, "Leeper" <leeper@molalla.net> put
finger to keyboard and composed:

Based on the lettering alone, could it be a 1N918, which happens to be
somewhat similar to a 1N4148?

Are you thinking of a 1N914?


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.