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Old 27th August 2005, 04:50 PM   #1
ashade is offline ashade  Brazil
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Default 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.
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Old 27th August 2005, 05:42 PM   #2
MikeB is offline MikeB  Germany
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About beta, the highest i have measured is a mpsa18 with hfe = 998,
with only vce = 5v and ic of 1ma... (original onsemi)

Mike
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Old 28th August 2005, 02:05 PM   #3
ashade is offline ashade  Brazil
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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???
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Old 28th August 2005, 02:28 PM   #4
Eva is offline Eva  Spain
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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.
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Old 28th August 2005, 02:30 PM   #5
MikeB is offline MikeB  Germany
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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
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Old 28th August 2005, 02:43 PM   #6
ashade is offline ashade  Brazil
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this one from panassonic (2SD2375), do u have the spice model? i can't find it googling..
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Old 28th August 2005, 03:22 PM   #7
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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
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Old 28th August 2005, 07:00 PM   #8
Eva is offline Eva  Spain
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Thanks
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Old 29th August 2005, 03:40 PM   #9
ashade is offline ashade  Brazil
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2SD2375 seems to be very good too for amp. Does someone have the spice model for it?
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Old 29th August 2005, 07:17 PM   #10
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Why the attention to Hfe only ?

You better be good, Bihibibibero !!
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