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Old 25th November 2005, 12:54 PM   #1
leander is offline leander  Malta
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Default Transistor replacement for mj15003/4

which are the nearest equivalents for mj15003/4, ?

The amp runs only +/-34v and runs on a 2ohm load, therefore I`m not going for the mj15024/5 which have higher Vceo.

I`m thinking of MJ11015/6....

Do you think those would work as a replacement ?
I downloaded the datasheet and noticed that these are darlingtons, have higher Ic rating and a bit lower Vceo rating than the Mj15003/4. All the parameters seem to be very close, the only difference is Hfe.

Mj15003/4 25 ~ 150
MJ11015/6 200~1000


does this make any difference on the amp

leander
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Old 25th November 2005, 01:24 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
yes, replacing an output with a darlington makes a difference.
The darlington should replace both the driver and the output.
But I would expect the performance with the darlington to be poorer compared to the discrete driver & output.
For low voltage use MJ(L)15003/4 are a very good choice for a slowish, hi current & reasonable gain transistor. Pretty adequate SOAR as well.
Another low cost, low voltage, slow Tr is the 3055 but current gain at high outputs falls badly.
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Old 25th November 2005, 01:31 PM   #3
leander is offline leander  Malta
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It seems to be impossible from here to obtain these mj15003/4s,

I found TIP35C/TIP36C are lower power versions of the mj15003/4, do you think these will get me going on ?
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Old 26th November 2005, 04:42 AM   #4
AJT is offline AJT  Philippines
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for rails of less than +/-45 volts, you sure can use them. but they are slower than mj15003 afaik.
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Old 26th November 2005, 06:36 AM   #5
leander is offline leander  Malta
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no I think they are faster tip35/6c Ft 3Mhz
Mj15003/4 Ft 2Mhz
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Old 27th November 2005, 02:05 PM   #6
djk is offline djk
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You will need two pair of the plastic outputs to replace the one pair of TO-3 metal outputs.
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Old 17th January 2006, 07:50 PM   #7
wp2djk is offline wp2djk  United States
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These transistors are available from http://www.futurlec.com for $3.90 USD
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Old 17th January 2006, 07:56 PM   #8
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Leander, how many do you need? I have a good few in my parts box at home.
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