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Old 8th September 2008, 09:35 PM   #1
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Default 2SJ50 and 2SK135 mosfet transistors

My amp needs 2 for each of these 2SJ50 and 2SK135 mosfet transistors. Does anyone know where I can get them in US.... Thanks.
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Old 8th September 2008, 10:39 PM   #2
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Very hard to find part.. Try littlediode.com..they have them but
they are 25-35$ apiece..owww

I have read you can sub 2sj162/2sk1058 at 10$ apiece with
minor mod because of different package TO-3/TO-247.

wish you luck..OS
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Old 9th September 2008, 01:14 AM   #3
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the TO-3P will fit in the original place on the heatsink, and the B-E leads can be bent to fit in the original holes, but you will need to find a reliable way to connect the collector lead. i have seen a round lug soldered to the collector wire, and attached to the TO-3 socket by bending it up over the face of the transistor to mate with the mounting screw. remember to replace the diamond shaped mica washers with the correct sil-pad or mica washer for the TO-3P package.
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Old 9th September 2008, 04:30 PM   #4
BV is offline BV  Slovakia
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Or try substitutes,
http://www.profusionplc.com/pro/gex/...eral%20mosfet#
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Old 9th September 2008, 05:22 PM   #5
russel is offline russel  Europe
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Also try http://www.magnatec-uk.com/mosdata.shtml

I think Farnell sell them
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Old 10th September 2008, 03:46 AM   #6
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at least one pair of MOSFETs looks interesting, the BUZ901D/906D devices look like they would work well, especially since they have a very low gate threshold (about 1/2 volt!). you could almost replace a pair of bipolars with them.
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Old 10th September 2008, 10:14 AM   #7
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by unclejed613
at least one pair of MOSFETs looks interesting, the BUZ901D/906D devices look like they would work well, especially since they have a very low gate threshold (about 1/2 volt!). you could almost replace a pair of bipolars with them.
does the datasheet show a range of Vds? eg. 0.15V min to 1.45V max?
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Old 10th September 2008, 11:17 AM   #8
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Old 10th September 2008, 11:34 AM   #9
russel is offline russel  Europe
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Quote:
Originally posted by unclejed613
at least one pair of MOSFETs looks interesting, the BUZ901D/906D devices look like they would work well, especially since they have a very low gate threshold (about 1/2 volt!). you could almost replace a pair of bipolars with them.

Well a pair of Darlingtons, which is what a lot of people did with the early devices. The Hitachi devices, which I am fairly sure the Magnatech parts are electrically very similar, were easy to use as they had a low gain and went neg tempco after about 100 or so mA. Some of the other FET types IIRC had a high gain and did not go neg tempco untill a couple of amps needing almost as much care in thermal compensation as Bipolars. The voltage swing for Vgs to obtain full output is of course a lot higher for the Hitachi type FETS.
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Old 10th September 2008, 11:41 AM   #10
AndrewT is offline AndrewT  Scotland
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Hi,
all the high power (around 100W to 200W) Lateral FETs have almost identical specifications.
I suspect they are all made under license from Hitachi, although I'm sure some of the current manufacturers will claim their specs have been arrived at completely independently of Hitachi.
The LFETs can be substituted easily without any circuit changes, except for the dual die versions which may need slight value changes in some components.
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