Not all lateral mosFET packages have the integrated gate protection Zeners.
Where the internal Zeners are fitted, it is still wise to fit external gate protection Zeners, that can be DESIGNED to survive known overload conditions.
The omission, or inclusion, of the gate protection Zeners may be why some builders claim different "sound" characteristics of different packages.
Where the internal Zeners are fitted, it is still wise to fit external gate protection Zeners, that can be DESIGNED to survive known overload conditions.
The omission, or inclusion, of the gate protection Zeners may be why some builders claim different "sound" characteristics of different packages.
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Hitachi 2SK1058 (lateral)
V(BR)DSX = 160V(min)
ID=7A
Ciss=600pF(typ)
IRF630N (Hexfet)
V(BR)DSS = 200V(min)
ID=9A
Ciss=575pF(typ)
Why?
It has 3x the current capability of the 2SK1058. The idea is to compare devices of similar voltage and current specs.
Maybe Papa has upgraded to a grandpa hence the holding on to older techniques?
Maybe I'm to brave in my theories...
Regards
Maybe I'm to brave in my theories...
Regards
the power capability of both are similar.
The continuous DC current rating is almost irrelevant
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If that were a mechanism for an alleged different sound, then it just proves how bad the protection is in that an omitted Gate protection Zener is probably the biggest sin a Builder can commit with respect to a mosFET output stage.
Put in the obligatory gate protection Zener and that "difference" is removed.
Put in the obligatory gate protection Zener and that "difference" is removed.
Hitachi 2SK1058 (lateral)
V(BR)DSX = 160V(min)
ID=7A
PD=100W
Ciss=600pF(typ)
IRF630N (Hexfet)
V(BR)DSS = 200V(min)
ID=9A
PD=82W
Ciss=575pF(typ)
IRFP240 (Hexfet)
V(BR)DSS = 200V(min)
ID=20A
PD=150W
Ciss=1300pF(typ)
It's clear that the IRFP240 is in quite a different class than the IRF630N or 2SK1058. Shouldn't we be comparing apples with apples?
Obviously this is not so.
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> an omitted Gate protection Zener is probably
> the biggest sin a Builder can commit with
> respect to a mosFET output stage.
IMO the Hitachi types have enough merits to preclude
any other output devices
> the biggest sin a Builder can commit with
> respect to a mosFET output stage.
IMO the Hitachi types have enough merits to preclude
any other output devices
so ...
where do you folks in the US get laterals from these days, anyway?
(ebay is not an option)
mlloyd1
where do you folks in the US get laterals from these days, anyway?
(ebay is not an option)
mlloyd1
Good question ..... I got some @ Newark before but now ?
I'd try :
Search results for: '2sk1058'
Search results for: '2sj162'
I'd try :
Search results for: '2sk1058'
Search results for: '2sj162'
1) most important
...the built in temperature compensation
...controls idle current plus raises channel
...resistance in case of overdriving
2) low threshold voltage
...doesn't waist as much front end
...swing as IRF types
3)built in gate zeners
...you can add these externally but
...why ?
4)linearity
...a pair of Renesas sans source resistors
...@ ~ 100ma. (ab follower stage) can do
...0.06% THD into 8 Ohm
...I don't know about IRF similar setup
...the built in temperature compensation
...controls idle current plus raises channel
...resistance in case of overdriving
2) low threshold voltage
...doesn't waist as much front end
...swing as IRF types
3)built in gate zeners
...you can add these externally but
...why ?
4)linearity
...a pair of Renesas sans source resistors
...@ ~ 100ma. (ab follower stage) can do
...0.06% THD into 8 Ohm
...I don't know about IRF similar setup
the last ones i bought came via bulk purchase from a distributor back in 1980s!
i've finally used them all up.
Not much luck finding replacement suppliers.
mlloyd1
i've finally used them all up.
Not much luck finding replacement suppliers.
mlloyd1
The same .... not really monotonic
but sorta quasi-montonic ......I.E.
same THD @ any level short of
clipping .............
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