some transistors of interest

ashade · 27th August 2005, 04:50 PM

Some questions on transistors:

wht's the bjt with highest beta you've ever seen, and whats its beta value?

Mine is the bc549c with 493.2 of beta. I think there are some with higher, but i don't know

what's the highest early voltage bjt you've ever seen? and the lowest?

what are the lowest and the highest Is bjts??

and there are many other questions we can make about it, post yours please.

MikeB · 27th August 2005, 05:42 PM

About beta, the highest i have measured is a mpsa18 with hfe = 998,
with only vce = 5v and ic of 1ma... (original onsemi)

Mike

ashade · 28th August 2005, 02:05 PM

hey, this is a very good transistor for amplification!! I wonder why I don't see the MPSA18 in amp projects.... is it expensive or hard to find???

Eva · 28th August 2005, 02:28 PM

Check 2SD2375 from Panasonic, it has a typical Hfe of 1000, it's rated at Vce=60V and Ic=3A and is commonly found in simple zener-transistor voltage regulators in oriental equipment. I don't know any similar standard part so I have to replace them by darlingtons everytime I find one blown.

MikeB · 28th August 2005, 02:30 PM

It's not expensive, but not too easy to get. (the mpsa18)
I use it in my amp projects and i am very happy with it.
Farnell does have the fairchild version, about the same price as a bc546b.

Mike

ashade · 28th August 2005, 02:43 PM

this one from panassonic (2SD2375), do u have the spice model? i can't find it googling..

jacco vermeulen · 28th August 2005, 03:22 PM

Quote:

Originally posted by Eva
Check 2SD2375 from Panasonic

Eva,

try Dalbani, in Surry, England.
Dalbani sells it as a Matsushita device (= Matshita Panasonic)
Something like $1.50 each

Eva · 28th August 2005, 07:00 PM

Thanks

ashade · 29th August 2005, 03:40 PM

2SD2375 seems to be very good too for amp. Does someone have the spice model for it?

jacco vermeulen · 29th August 2005, 07:17 PM

Why the attention to Hfe only ?

You better be good, Bihibibibero !!

27th August 2005, 04:50 PM	#1
ashade diyAudio Member Join Date: Aug 2005	some transistors of interest Some questions on transistors: wht's the bjt with highest beta you've ever seen, and whats its beta value? Mine is the bc549c with 493.2 of beta. I think there are some with higher, but i don't know what's the highest early voltage bjt you've ever seen? and the lowest? what are the lowest and the highest Is bjts?? and there are many other questions we can make about it, post yours please.

29th August 2005, 07:17 PM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Why the attention to Hfe only ? You better be good, Bihibibibero !! __________________ Looks like Sponge Bob has killed another thread.

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27th August 2005, 05:42 PM	#2
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	About beta, the highest i have measured is a mpsa18 with hfe = 998, with only vce = 5v and ic of 1ma... (original onsemi) Mike

28th August 2005, 02:05 PM	#3
ashade diyAudio Member Join Date: Aug 2005	hey, this is a very good transistor for amplification!! I wonder why I don't see the MPSA18 in amp projects.... is it expensive or hard to find???

28th August 2005, 02:28 PM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Check 2SD2375 from Panasonic, it has a typical Hfe of 1000, it's rated at Vce=60V and Ic=3A and is commonly found in simple zener-transistor voltage regulators in oriental equipment. I don't know any similar standard part so I have to replace them by darlingtons everytime I find one blown.

28th August 2005, 02:30 PM	#5
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	It's not expensive, but not too easy to get. (the mpsa18) I use it in my amp projects and i am very happy with it. Farnell does have the fairchild version, about the same price as a bc546b. Mike

28th August 2005, 02:43 PM	#6
ashade diyAudio Member Join Date: Aug 2005	this one from panassonic (2SD2375), do u have the spice model? i can't find it googling..

28th August 2005, 07:00 PM	#8
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Thanks

29th August 2005, 03:40 PM	#9
ashade diyAudio Member Join Date: Aug 2005	2SD2375 seems to be very good too for amp. Does someone have the spice model for it?

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