darlington replacement ?

[mark krawczuk]

hi, i have a blown npn darlington 2sd1525 from a cars fan speed controller
, and its rated at 30 amp , doesnt this seem excessive ? i doubt it if
the fan would draw more than 5 amp ....

anyways , i have had a pretty good look on the net , and the only
direct replacements are only available over seas ,
is there a commonly available equivalent npn darlington ? that i could use
?

thanks, mark k

 

[Roger Hamlett]

"mark krawczuk" <krawczuk65@dodo.com.au> wrote in message
news:46e2a1ce$0$59437$c30e37c6@lon-reader.news.telstra.net...

hi, i have a blown npn darlington 2sd1525 from a cars fan speed
controller , and its rated at 30 amp , doesnt this seem excessive ? i
doubt it if the fan would draw more than 5 amp ....
No, it doesn't 'seem excessive'. The _instantaneous_ peak current as you

turn on, will typically be several times the 'normal' operating current.
Transistors, blow very quickly, and if the unit is fused at perhaps 7A,
you would need to be using a transistor this sort of size, to have much
hope of the fuse blowing before the transistor...
Since the unit is a 'speed controller', it is almost certainly a PWM
design,

anyways , i have had a pretty good look on the net , and the only
direct replacements are only available over seas ,
is there a commonly available equivalent npn darlington ? that i could
use
Just get a 2SD1525. Several US suppliers show them in stock, who will post

to Australia. 'aeri' in Australia, will supply directly, if you don't want
to fiddle around dealing with an overseas company.

Best Wishes

 

[GregS]

In article <46e2a1ce$0$59437$c30e37c6@lon-reader.news.telstra.net>, "mark krawczuk" <krawczuk65@dodo.com.au> wrote:

hi, i have a blown npn darlington 2sd1525 from a cars fan speed controller
, and its rated at 30 amp , doesnt this seem excessive ? i doubt it if
the fan would draw more than 5 amp ....

anyways , i have had a pretty good look on the net , and the only
direct replacements are only available over seas ,
is there a commonly available equivalent npn darlington ? that i could use
?

My sub book says 2SD1597

 

[mark krawczuk]

hi, would either of these be ok ?

MJ11016 NPN Power Darlington Transistor
MJ11032 NPN Power Darlington Transistor

these are easier to get for me.


thanks, mark k


"GregS" <zekor@comcast.net> wrote in message
news:fc8n5s$au7$1@usenet01.srv.cis.pitt.edu...

In article <46e2a1ce$0$59437$c30e37c6@lon-reader.news.telstra.net>, "mark
krawczuk" <krawczuk65@dodo.com.au> wrote:
hi, i have a blown npn darlington 2sd1525 from a cars fan speed
controller
, and its rated at 30 amp , doesnt this seem excessive ? i doubt it if
the fan would draw more than 5 amp ....

anyways , i have had a pretty good look on the net , and the only
direct replacements are only available over seas ,
is there a commonly available equivalent npn darlington ? that i could
use
?

My sub book says 2SD1597

 

[G]

In article <46e7eea4$0$28589$c30e37c6@lon-reader.news.telstra.net>, "mark krawczuk" <krawczuk65@dodo.com.au> wrote:

hi, would either of these be ok ?

MJ11016 NPN Power Darlington Transistor
MJ11032 NPN Power Darlington Transistor

these are easier to get for me.

Try it.

greg

thanks, mark k


"GregS" <zekor@comcast.net> wrote in message
news:fc8n5s$au7$1@usenet01.srv.cis.pitt.edu...
In article <46e2a1ce$0$59437$c30e37c6@lon-reader.news.telstra.net>, "mark
krawczuk" <krawczuk65@dodo.com.au> wrote:
hi, i have a blown npn darlington 2sd1525 from a cars fan speed
controller
, and its rated at 30 amp , doesnt this seem excessive ? i doubt it if
the fan would draw more than 5 amp ....

anyways , i have had a pretty good look on the net , and the only
direct replacements are only available over seas ,
is there a commonly available equivalent npn darlington ? that i could
use
?

My sub book says 2SD1597