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Smitty Two
Guest
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 Posted:
Thu Sep 08, 2005 4:24 pm Post subject:
high voltage, low current transistors? |
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OK, so my boss asked me to source some transistors that operate in the
100 volts plus, sub 100 micro amp range. Has he been drinking too much
Pepsi, or do such things actually exist? (remove first h for email)
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Watson A.Name - \"Watt Su
Guest
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| Posted:
Thu Sep 08, 2005 4:35 pm Post subject:
Re: high voltage, low current transistors? |
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"Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-D5DE7D.04240108092005@news.west.cox.net...
| Quote: | OK, so my boss asked me to source some transistors that operate in the
100 volts plus, sub 100 micro amp range. Has he been drinking too much
Pepsi, or do such things actually exist? (remove first h for email)
|
The MPSA42 (NPN) and MPSA92 (PNP) are both capable of handling 300V and
sub milliamp currents. They are available in quantities of 100 or so on
Ebay. |
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Spehro Pefhany
Guest
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| Posted:
Thu Sep 08, 2005 4:35 pm Post subject:
Re: high voltage, low current transistors? |
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On Thu, 08 Sep 2005 04:24:01 -0700, the renowned Smitty Two
<prestwhich@earthlink.net> wrote:
| Quote: | OK, so my boss asked me to source some transistors that operate in the
100 volts plus, sub 100 micro amp range. Has he been drinking too much
Pepsi, or do such things actually exist? (remove first h for email)
|
MMBTA42 (SMT)
MPSA42 (TO-92)
Around a nickel US or less in moderate volume.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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Geir Klemetsen
Guest
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| Posted:
Fri Sep 09, 2005 1:45 pm Post subject:
Re: high voltage, low current transistors? |
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"Smitty Two" <prestwhich@earthlink.net> skrev i melding
news:prestwhich-D5DE7D.04240108092005@news.west.cox.net...
| Quote: | OK, so my boss asked me to source some transistors that operate in the
100 volts plus, sub 100 micro amp range. Has he been drinking too much
Pepsi, or do such things actually exist? (remove first h for email)
|
Unmount a CRT-screen/tv and look for the printcard mounted on the rear end
of the CRT tube. On that card, you'll find three transistors that operates
well for high voltage and low current. |
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Watson A.Name - \"Watt Su
Guest
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| Posted:
Fri Sep 09, 2005 4:35 pm Post subject:
Re: high voltage, low current transistors? |
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"Geir Klemetsen" <regeirgarbagespam@start.no> wrote in message
news:dfri88$8qh$1@services.kq.no...
| Quote: |
"Smitty Two" <prestwhich@earthlink.net> skrev i melding
news:prestwhich-D5DE7D.04240108092005@news.west.cox.net...
OK, so my boss asked me to source some transistors that operate in
the
100 volts plus, sub 100 micro amp range. Has he been drinking too
much
Pepsi, or do such things actually exist? (remove first h for email)
Unmount a CRT-screen/tv and look for the printcard mounted on the rear
end
of the CRT tube. On that card, you'll find three transistors that
operates
well for high voltage and low current.
|
The threee transistors that drive the three colors are made to dissipate
quite a bit of power, and are not low current. They have load resistors
that are power resistors, and handle several watts. |
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Smitty Two
Guest
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| Posted:
Sat Sep 10, 2005 5:54 am Post subject:
Re: high voltage, low current transistors? |
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In article <11i0d22htgvm660@corp.supernews.com>,
"Watson A.Name - \"Watt Sun, the Dark Remover\""
<NOSPAM@dslextreme.com> wrote:
| Quote: | "Smitty Two" <prestwhich@earthlink.net> wrote in message
news:prestwhich-D5DE7D.04240108092005@news.west.cox.net...
OK, so my boss asked me to source some transistors that operate in the
100 volts plus, sub 100 micro amp range. Has he been drinking too much
Pepsi, or do such things actually exist? (remove first h for email)
The MPSA42 (NPN) and MPSA92 (PNP) are both capable of handling 300V and
sub milliamp currents. They are available in quantities of 100 or so on
Ebay.
|
I'll go with the audience, Meredith. Forwarded the data sheets on the
MPSA42/92 to the man upstairs and got them rubber-stamped. Thanks,
audience!!! Watson and Spehro saved me a lot of work! |
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Geir Klemetsen
Guest
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| Posted:
Mon Sep 12, 2005 12:35 am Post subject:
Re: high voltage, low current transistors? |
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"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> skrev
i melding news:11i31m5mo0ket22@corp.supernews.com...
----
| Quote: | The threee transistors that drive the three colors are made to dissipate
quite a bit of power |
Correct
| Quote: | And are not low current.
I'm disagree. Read the specs for them. Mostly, they wont be able to draw |
more than 100 - 200 mA.
| Quote: | They have load resistors that are power resistors, and handle several
watts. |
That is right. You are dealing with power transistors: High voltage an not
so high current. |
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redbelly
Guest
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| Posted:
Mon Sep 12, 2005 4:35 pm Post subject:
Re: high voltage, low current transistors? |
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Geir Klemetsen wrote:
| Quote: | Read the specs for them. Mostly, they wont be able to draw
more than 100 - 200 mA.
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The OP is looking for around 0.1 mA or less.
Mark |
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