Looking for P-Fet 2N5465

housing · 7th February 2007, 06:34 PM

2 pieces, at least.

spencer · 8th February 2007, 11:56 PM

I have some 2N5462 (40V) and 2SJ103 (50V). Interested email me.

housing · 9th February 2007, 10:49 AM

Quote:

Originally posted by spencer
I have some 2N5462 (40V) and 2SJ103 (50V). Interested email me.

Thanks for your offer, Spencer. But 2N5465 is the only choice.

spencer · 9th February 2007, 10:54 AM

Just query what application must use 2N5465 which is a obsolete part. Actually 2N5462 and 2N5465 are same series part sorted for different working voltages in the past and I guess due to low yeild at 60V, it was later not available.

housing · 9th February 2007, 11:08 AM

Quote:

Originally posted by spencer
Just query what application must use 2N5465 which is a obsolete part. Actually 2N5462 and 2N5465 are same series part sorted for different working voltages in the past and I guess due to low yeild at 60V, it was later not available.

It's a constant current source for the input stage of a power amplifier. 60 volt P-channel JFET is a must if I want to follow the design strictly.

spencer · 9th February 2007, 11:24 AM

There are many methods to achieve the voltage and current for a current source. One example is to use Jfet in series with a zener diode of 20V and then then jfet will not be loaded for too high a voltage but you still get the current regulation.

housing · 9th February 2007, 12:40 PM

Quote:

Originally posted by spencer
There are many methods to achieve the voltage and current for a current source. One example is to use Jfet in series with a zener diode of 20V and then then jfet will not be loaded for too high a voltage but you still get the current regulation.

Yes, I know that. But I just want to follow the original design strictly unless the JFET is impossible to find.

I just look at the data sheets of P-channel FETs, 2SJ164 with Idss over 4 mA may be a suitable replacement. Do you have it?

spencer · 9th February 2007, 12:42 PM

Sorry I don't have.

housing · 9th February 2007, 12:50 PM

No problem. Thank you!

jackinnj · 8th April 2009, 01:15 PM

Quote:

Originally posted by housing

Yes, I know that. But I just want to follow the original design strictly unless the JFET is impossible to find.

I just look at the data sheets of P-channel FETs, 2SJ164 with Idss over 4 mA may be a suitable replacement. Do you have it?

2SJ164 -- see 2SJ0164 -- Digikey has them in stock.

http://www.semicon.panasonic.co.jp/ds4/SJF00002CED.pdf

7th February 2007, 06:34 PM	#1
housing diyAudio Member Join Date: Nov 2006	Looking for P-Fet 2N5465 2 pieces, at least.

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8th February 2007, 11:56 PM	#2
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	I have some 2N5462 (40V) and 2SJ103 (50V). Interested email me.

9th February 2007, 10:54 AM	#4
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	Just query what application must use 2N5465 which is a obsolete part. Actually 2N5462 and 2N5465 are same series part sorted for different working voltages in the past and I guess due to low yeild at 60V, it was later not available.

9th February 2007, 11:24 AM	#6
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	There are many methods to achieve the voltage and current for a current source. One example is to use Jfet in series with a zener diode of 20V and then then jfet will not be loaded for too high a voltage but you still get the current regulation.

9th February 2007, 12:42 PM	#8
spencer diyAudio Member Join Date: Jun 2004 Location: Hong Kong	Sorry I don't have.

9th February 2007, 12:50 PM	#9
housing diyAudio Member Join Date: Nov 2006	No problem. Thank you!

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