Can someone teach me a bit about the difference between these mosfets? - diyAudio
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Old 9th March 2012, 04:58 PM   #1
JZatopa is offline JZatopa  United States
diyAudio Member
Join Date: May 2003
Location: Chicago
Default Can someone teach me a bit about the difference between these mosfets?

Noob question.

OK so I have no clue what I am looking at when I look at a data sheet. I can understand some of the basics, like maximum current drain and voltage. What I can't understand is how to tell if a device is going to be great for audio or just amazing.

For example, I have a mediocre amplifier here that uses a pair of 2SA1908 and 2SC5100 ouputs for each channel. I also see a 2 c2240, 1 A1358 and 1 c3421. I don't have a schematic but from what I am seeing I am guessing it is a 3 stage amplifier with parallel output transistors.

2SA1908_07 pdf, 2SA1908_07 description, 2SA1908_07 datasheets, 2SA1908_07 view ::: ALLDATASHEET :::
2SC5100 pdf, 2SC5100 description, 2SC5100 datasheets, 2SC5100 view ::: ALLDATASHEET :::
A1358 pdf, A1358 description, A1358 datasheets, A1358 view ::: ALLDATASHEET :::
C3421 datasheet pdf, Toshiba Semiconductor - Search -----> 2SC3421 ::
View C2240_2046634.PDF datasheet online --- IC-ON-LINE

Personally I have built an F5 amplifier using irf240 and irf9240 outputs. The amp sounds wonderful.

I understand that circuit topology is a big factor in sound. What I want to know is this.

1. The datasheets look to be measuring different things for each mosfet, is this just different ways of displaying the same data on each device? If so I guess that means I will need to learn the different nomenclatures for the same measured spec.
2. Looking at the data sheets, from the little I know, it would look like I could plug in the IRF240 IRF9240 in place of the 2SC5100 and 2SA1908. What I don't understand is, what the differences between the two sets of devices would be. Or put simply, what would happen?
3. Comparing the 2sc5100 to the IRF240, how can I tell which one will sound/perform better in a circuit by looking at the datasheet.

The reverse way of looking at this, for me, is what would happen if I put the 2SC5100 and 2SA1908 as the outputs of an F5. How would that affect the sound and performance of the amplifier.

I understand that there may not be a simple answer to some of these questions but I appreciate any help in understanding this a little better.
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Old 9th March 2012, 05:10 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
this post states
I would say that there are 4 versions of output devices that can be used in Power amplifiers.
BJT - silicon
BJT - germanium
FET - lateral
FET - vertical.

I believe that all 4 need to be approached differently at the design stage.
I further believe that one cannot simply swap between any of these types when an amplifier is designed to perform properly with only one of those types.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 9th March 2012, 08:57 PM   #3
JZatopa is offline JZatopa  United States
diyAudio Member
Join Date: May 2003
Location: Chicago
Aren't these similar types of fets?
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