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Linear Systems Dual Transistors
Linear Systems Dual Transistors
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Old 26th November 2008, 01:56 AM   #1
jgedde is offline jgedde  United States
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Default Linear Systems Dual Transistors

The LS312 and LS352 seem like appealing devices for input stages. They have good Hfe, 60V BVCEO and they're matched to boot. Noise is a complete unknown, unfortunately.

The THAT3xx seem great with regard to noise, but are very limited with regard to Hfe and BVCEO.

Has anyone used the LS parts? Any words on whether these should be considered "low noise" parts? They only give a NF spec is of limited value. I'd really like to see a noise density figure for these parts...

Thanks in advance,
John Gedde
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Old 26th November 2008, 10:35 AM   #2
homemodder is offline homemodder  Portugal
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jgedde, I dont know the ls parts, but if you looking for top performance dual try this one, its excellent in all respects, 2sc3067. Cheap too, around a 1.5 dollars.
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Old 26th November 2008, 11:00 AM   #3
sandyK is offline sandyK  Australia
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Default Linear Systems Dual Transistors

The LS352 is supposed to be a replacement for the 2N3811A, (among others) which was a very good device, and used by designers like Erno Borbely. The LS312 is I believe a replacement for the 2N2920 (among others) and also heavily favoured originally.

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Old 26th November 2008, 02:23 PM   #4
scott wurcer is offline scott wurcer  United States
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Linear Systems Dual Transistors
The layout is right on the data sheet, these are small two stripe devices, that coupled with the 3dB noise figure at 10k source resistance does not bode well for these being low noise.

On Hfe, remember low base series resistance and high Hfe are somewhat incompatible. So the lowest noise and really high beta don't go together.
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
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