I've got a shorted diode in a power supply. The diode is very small
and I cannot figure out a replacement part. I think its a zener or
switching diode. It is the redish gold color type with a black band.
Its very very small and the only numbers on it are 442 (but it could be
244 or 424 since the number wrap around).

Anyone have an idea what the specs are for this so I can replace it?

Thanks,
Stephen

Stephen wrote:
I've got a shorted diode in a power supply. The diode is very small
and I cannot figure out a replacement part. I think its a zener or
switching diode. It is the redish gold color type with a black band.

Its very very small and the only numbers on it are 442 (but it could
be
244 or 424 since the number wrap around).

Anyone have an idea what the specs are for this so I can replace it?

Thanks,
Stephen

Stephen,

Does a 24 volts Zener sound reasonable?

I encountered two of a similar type diode, with 3 nubers that wrap
around the tiny diode, in a Pioneer receiver last week. I entered
the model # and circuit reference designator on Pioneer's customer
service website, and found they were MTZJ- series zener diodes, and
one of the three numbers is actually a letter. Your 244 is likely
24A, and would be MTZJ-24A.

These are 0.5 watt Zeners made by Leshan Radio Corp in China. They
are spec'd to run at 5 mA current, lower than the common U.S. 1N52xx
series zeners. The letter suffix denotes where in the tolerance range
the actual voltage is, A is at the low end, D at the high end of the
+/- 5% tolerance range.

Mike
WB2ME

On 2005-02-18 17:45:34 -0700, said:


Stephen wrote:
I've got a shorted diode in a power supply. The diode is very small
and I cannot figure out a replacement part. I think its a zener or
switching diode. It is the redish gold color type with a black band.

Its very very small and the only numbers on it are 442 (but it could
be
244 or 424 since the number wrap around).

Anyone have an idea what the specs are for this so I can replace it?

Thanks,
Stephen

Stephen,

Does a 24 volts Zener sound reasonable?

I encountered two of a similar type diode, with 3 nubers that wrap
around the tiny diode, in a Pioneer receiver last week. I entered
the model # and circuit reference designator on Pioneer's customer
service website, and found they were MTZJ- series zener diodes, and
one of the three numbers is actually a letter. Your 244 is likely
24A, and would be MTZJ-24A.

These are 0.5 watt Zeners made by Leshan Radio Corp in China. They
are spec'd to run at 5 mA current, lower than the common U.S. 1N52xx
series zeners. The letter suffix denotes where in the tolerance range
the actual voltage is, A is at the low end, D at the high end of the
+/- 5% tolerance range.

Mike WB2ME

Thanks for the reply Mike. Its worth a shot.

Stephen wrote:

I've got a shorted diode in a power supply. The diode is very small and
I cannot figure out a replacement part. I think its a zener or
switching diode. It is the redish gold color type with a black band.
Its very very small and the only numbers on it are 442 (but it could be
244 or 424 since the number wrap around).

Anyone have an idea what the specs are for this so I can replace it?

Thanks,
Stephen

if its a 1n244 then is a 1 amp silicone diode rated rated around 600 V
per NTE
any other number indicates from NTE that is a zener diode and that
you need more info.