IRF540/9540 or IRFP240/9240

[Ermac]

Hi, Why do most HEXFET amplifiers use IRFP240/9240 ?
Using matched pairs like IRF540/9540 isn't better ?

 

[sivan_and]

high power dissipation (Pd )& high Vds

 

[nigelwright7557]

high power dissipation (Pd )& high Vds

They are pretty cheap too.

Personally I use IRFP250 and IRFP9240.
I can get the IRFP250's for £1-50 and the IRFP9240's for £2-50 and that is one off prices !

 

[sivan_and]

They are pretty cheap too.

Personally I use IRFP250 and IRFP9240.
I can get the IRFP250's for £1-50 and the IRFP9240's for £2-50 and that is one off prices !

how much would IRF540/9540 cost thr ?

 

[nigelwright7557]

how much would IRF540/9540 cost thr ?

I cant get them through my suplliers.

 

[kenpeter]

My reciept from the local surplus shop shows I paid $1.99 each..
For both 940 and 9540.... I was actually looking for 610/9610s,
but you take what you can get when you find it cheap...

 

[kuldeepsingh]

@ Sivan,

i got IRFP250 for 35 Rs/- in haryana

 

[mymindinside]

hi kuldeep
i need these transistors(IRFP240/9240) for a clone of the firstwatt F2 amp.
i am not able to find them in mumbai, were the ones you got of good quality?
what project did you use them in?
any idea where one can find them in either mumbai or delhi?

 

[kuldeepsingh]

hi kuldeep
i need these transistors(IRFP240/9240) for a clone of the firstwatt F2 amp.
i am not able to find them in mumbai, were the ones you got of good quality?
what project did you use them in?
any idea where one can find them in either mumbai or delhi?

Hi,

i purchased them for CHAN Nmos 200 watts amplifier. thought i have not started making the amp, i got them easily in local mkt. i am pretty sure you will get them in mumbai, just search a little.

 

[andrewlebon]

irfp 240 9240

hi folks
greetings everyone i had the same problem finding hexfets
to build anthony holtons av 1000 av 800 .in delhi in bhagirath palace
KHANDELWAL ELECTRONICS has every type of mosfet hexfet
st brand and irf 460 irf 240 irf9240 irf 9610 and very cheap
IRF 240 IRF9240 90rupees a pair
for 500 watt legend amplifier instead of irf240 used irf250 30 rupees
each.
thanking you
andrew lebon

 

[sivan_and]

Re: irfp 240 9240

@ Sivan,

i got IRFP250 for 35 Rs/- in haryana

hi folks
greetings everyone i had the same problem finding hexfets
to build anthony holtons av 1000 av 800 .in delhi in bhagirath palace
KHANDELWAL ELECTRONICS has every type of mosfet hexfet
st brand and irf 460 irf 240 irf9240 irf 9610 and very cheap
IRF 240 IRF9240 90rupees a pair
for 500 watt legend amplifier instead of irf240 used irf250 30 rupees
each.
thanking you
andrew lebon

The P-type device is not available here in Calicut...however the IRFP240 & IRFP250 costs 50/- rs per piece.

 

[masood]

hi mymindiside,
you can these mosfet in mumbai at visha electronics atgrand road,lamington road opp. police choki

 

[mymindinside]

Hey Thanks Masood,

I ended up buying a matched set from tech-diy.com but i did check lamington road and they were available at a few shops. I didn't check Visha. The prices given to me at the time (more than a year ago) was Rs. 250/pair (240/9240)

cheers
mymindinside

 

[CBS240]

'Q-fet" planer stripe DMOS are cheap too. These two have similar Gm and similar Vgs/Id slopes, and this makes them more 'complementary', if the term could be used for vertical type power mosfets. IRF540/9540 are not very 'complementary', one has 3-4 times the transconductance of the other, notice the transfer characteristics are very dis-similar, introducing asymmetrical distortion figures. IRF530/9540 would be a much better choice. IRFP250/9240 are far from 'complementary' as well, but IRFP240/9240 are much closer. The goal is to get the slope of the overall Gm/Id figure to be constant, providing lower distortion. This starts with choosing the right components.

 

[BrianVG]

I used IRF640/9540. I bought them for €0,75 ->$1US.
http://www.diyaudio.com/forums/solid-state/188194-easy-low-cost-irf540-9540-amp.html
Very cheap, I still need to test the prototype, but sounds ok

 

[masood]

hi all,
I think it is very hard to find p -type of semiconductor so why not we use only n-type of semiconductor I mean transistor in both channel.thanking you.masood
i

 

[BrianVG]

masood
I have no problem finding P-types in Europe.

 

[rahkik]

I GOT IRFP 240/9240 AT 60 RS/- PER ITEM AT NAGPUR SUPPLIED BY MY BROTHER FROM NAGPUR.........

 

[ontoaba]

IRF540N or irf9540N ~Rp5000 each for 100pcs, without N mark priced less than with N mark. IRF540N/9540N are not suitable for higher than +-38V supply. $1 ~ Rp9000.

 

[masood]

hi folks
greetings everyone i had the same problem finding hexfets
to build anthony holtons av 1000 av 800 .in delhi in bhagirath palace
KHANDELWAL ELECTRONICS has every type of mosfet hexfet
st brand and irf 460 irf 240 irf9240 irf 9610 and very cheap
IRF 240 IRF9240 90rupees a pair
for 500 watt legend amplifier instead of irf240 used irf250 30 rupees
each.
thanking you
andrew lebon

plz mention the shop number
thanking you