So I guess that after these blow you will be going with 6A10's or whatever
comes along next (-;
If an amp doesnt work thru a contest year it wasnt big enough. I guess that
is why homebrew is real popular again.
Carl
KM1H
----- Original Message -----
From: "Jim Garland" <4cx250b@muohio.edu>
To: <amps@contesting.com>
Sent: Tuesday, June 08, 2010 5:11 PM
Subject: Re: [Amps] 1N5408 vs 1N5553
>
>> >From a quick search it appears that the 1N5553 reverse current is 1ua,
> and
>> the 1N5408 is 5ua, both at 25*C. Leakage goes up with temperature.
>>
>> Carl
>> KM1H
>>
>
> I was surprised to learn that the 1N5408 is made by at least 29 different
> manufacturers
> (http://www.datasheetcatalog.com/datasheets_pdf/1/N/5/4/1N5408.shtml) ,
> and
> specs vary slightly among the group. General Semiconductor gives the
> reverse
> leakage (25 degrees C) as 5 uA, while On Semiconductor specifies it as 10
> uA. On Semiconductor gives the 150C reverse current as 100uA, whereas
> Semtech gives the 105C (not 150C) leakage current as 500 uA. Everbody
> agrees
> the 1N5408 is rated at 3ADC (with leads of about 1/2 inch).
>
> The 1N5553 also shows some variation among different manufacturers, though
> most agree that the reverse leakage current at PIV is 1 uA at 25C, rising
> to
> 20uA at 100C. All manufacturers specify the switching speed of the 1N5553
> at 2 usec, and nobody specs the switching speed of the 1n5408. Don't know
> why. The 1N5553 is rated at 5ADC with 3/8 in. leads, or 3A DC, with
> shorter
> leads.
>
> You can buy one 1N5408 from Mouser for $0.15 (Taiwan Semiconductors).
> Mouser
> stocks tens of thousands of them. Mouser says the 1N5553 is now obsolete
> and
> no longer stocks them. Newark still sells them, however, and prices have
> plummeted to about $1/ea in quantities of 1000. A few months ago, when
> they
> were still in production and "military approved," they were selling for
> about $16/each. Maybe Uncle Sam finally wised up! (FYI, I bought fifty
> from a local surplus dealer for $5. Nice little diodes.)
>
> 73,
> Jim W8ZR
>
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