Re: Diode Rectifier Differences (Repost)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "David Speck by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dave-at-davidspeckmd-dot-org>

Matt,
My Dad used to make power semiconductors for GE, (which later became Powerex).

All the power semiconductors that they made were glass passivated -- 
passivation indicating a treatment of the edges of the semiconductor dice 
to reduce hot spots caused by local differences in current flow.

I believe that this is standard practice on all such devices, so you 
probably would not find any significant difference in performance between 
these three devices.  Were the prices all from one seller, or from 
different sellers?  They may also indicate differences in package types, or 
in guaranteed operating temperature ranges. or in permissible reverse 
leakage currents.

HTH,
Dave Speck


>>Hi Y'All
>>        Could some knowledgeable person explain the difference/advantage 
>> between these diodes (if any) as applies to rectified TC supply?
>>
>>      1N5408        3A 1000V silicon rectifier  -at- $16.80/100
>>      1N5408-T     3A 1000V silicon and glass passivated rectifier  -at- 
>> $19.24/100
>>      1N5408G-T  3A 1000V glass passivated rectifier -at- $30.30/100
>>
>>Thanks,
>>Matt D.