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Lateral MOSFET replacements for 2SK1058 (Hitachi)
Lateral MOSFET replacements for 2SK1058 (Hitachi)
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Old 10th June 2003, 08:50 PM   #21
peranders is offline peranders  Sweden
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Lateral MOSFET replacements for 2SK1058 (Hitachi)
Default Re: What makes a quiet component?

Quote:
Originally posted by EternaLightWith
Why are certain transistors and MOSFets, etc. more quiet than others. I guess I'm asking if there is a variable that makes tem better or worse for audio? I'm assuming that the higher the voltage, beta, and bandwidth, the higher the noise.

The reason I ask is that I want to make Rangy's OptiMOS and I wanted to know what the quiestest components I could put in there. I don't think I'll need 200W version with high effeicent speakers so I was planning on lowering the wattage.

Eternalightwithin
Noise has lot's to do with process technology.

If you are talking about noise in the output transistors, it's not a very important parameter, much more important in the input stage, 70-90% of all noise is generated there.
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Old 10th June 2003, 09:52 PM   #22
EternaLightWith is offline EternaLightWith  United States
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Yes I realize that. I had the input and VAS in mind actually. So are you saying that you really can't tell the noise characteristics, or lack thereof hopefully, unless you listen to it.

I was just curious if there were certain attributes you could look at and guessimate whether a device was low or high noise.

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Old 11th June 2003, 07:02 AM   #23
peranders is offline peranders  Sweden
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Lateral MOSFET replacements for 2SK1058 (Hitachi)
MOSFET's have allways more noise than other types but as long as you don't have them as input transistors you don't have to worry. Noise is never specified for power MOSFET's, only for RF like dualgate mosfet's.

I don't know if it's possible to estimate the noise just by looking at the transistor and how it's built? Never thought about it really.
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Old 11th June 2003, 07:13 AM   #24
jleaman is offline jleaman  Belgium
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are you thinking about building a hitachi lateral amplifier from www.aussieamplifiers.com..
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Old 11th June 2003, 07:20 PM   #25
EternaLightWith is offline EternaLightWith  United States
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I wanted to build Randy SLoane's Amplifier. But thanks for the link.

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Old 11th June 2003, 11:59 PM   #26
jgwinner is offline jgwinner  United States
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I bought 4 of Sloan's transistors and the exicon transistors (the 200v ones with more current). I plan on doing some listning tests but I have to admit I haven't gotten the amp built. Most of the circuit boards are populated, I need an enclosure.

So I'm not sure if they work well or not yet.
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Old 12th June 2014, 07:33 PM   #27
UltimateX86 is offline UltimateX86  France
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Quote:
Originally Posted by Christer View Post
Here are Spice models for all the Exicon devices. I got them
from Exicon, so they should be OK.

http://www.diyaudio.com/forums/attac...con-mosfet.zip

Hello,

these models are true to reality?
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Old 22nd December 2017, 05:16 PM   #28
Krisfr is online now Krisfr  United States
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Quote:
Originally Posted by Christer View Post
Here are Spice models for all the Exicon devices. I got them
from Exicon, so they should be OK.
I had a very hard time trying to find these models, I am just making this post to hopefully make the search easier for someone else later. This includes models for the EXC10N20 and EXC10P20. Thanks for sharing.
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Old 23rd December 2017, 07:27 PM   #29
smartx21 is offline smartx21  Brazil
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Send a message via MSN to smartx21 Lateral MOSFET replacements for 2SK1058 (Hitachi)
Quote:
Originally Posted by mlloyd1 View Post
The IR devices are NOT a drop-in replacement for the Hitachi devices. The lateral devices have very different characteristics from HEXFETs. The zero tempco bias point for the Hitachis is around ~100mA; for the HEXFETs it is Amps (!), so you will have to do a bias regulator, unless you are doing Class A as Mr. Pass does.
mlloyd1
They aren't even pin-to-pin compatible!
Attached Images
File Type: jpg 2SK1058 pinout.jpg (20.2 KB, 209 views)
File Type: jpg IRFP140.jpg (16.7 KB, 208 views)
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Old 23rd December 2017, 10:59 PM   #30
IanHegglun is offline IanHegglun  Australia
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Quote:
Originally Posted by Krisfr View Post
"Original Post by Christer View Post Here are Spice models for all the Exicon devices. I got them from Exicon, so they should be OK."
I had a very hard time trying to find these models, I am just making this post to hopefully make the search easier for someone else later. This includes models for the EXC10N20 and EXC10P20. Thanks for sharing.
Unfortuately there seems to be a typo in the Exicon model file that has been posted above, in particular one value for the ecf20P20 Kp=0.548 (which is the same value as the ecf10P25) .

The ecf20P20 has two-die so it must be about double the single-die version ecf10P20 which is Kp=0.511. Assuming it is a typo, we could simply double the ecf20P20 Kp to fix it. The ecf20P20's Kp then should be more like Kp=1.022.

I haven't checked the Internet to see if anyone else has spotted this or if Exicon have a corrected version. Please let us know if there are any updates on the file posted above 'Model generated on Feb 7 2000'.

My measurements of Exicon 10N20, 10P20 and 20N20, 20P20 give higher values of Kp for the P devices -- being closer to Kp=1.8 at 25 C for twin-die 20P20.

In 2015 I measured at pair of single-die and a pair of dual-die 25 C and 75 C and V & I measured to +/-1%. My models can be found here if you would like to try them Better power MOSFET models in LTSpice
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