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Old 8th January 2008, 04:59 AM   #1
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Default Transistor Selection Help

I am looking for a Bipolar transistor that is rated for at least 150vdc can handle 2.5watts with a gain of 100min.

I have looked at several of the usuals but it seems something with High VDC and a gain of 100 is a hard thing to do? I have found a couple but there 40+ watt devices in TO-220 cases and i am trying to keep the size small.

This is for a Switching application that will see variable DC with peaks as high as 130Vdc.

a TO-39 was about as big as i was hoping to see. smaller if possible.
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Old 8th January 2008, 05:13 AM   #2
poobah is offline poobah  United States
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Can you make a FET work in your application?

Make is your maximum current?

Do you have a rough idea of power dissipation?

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Old 8th January 2008, 08:51 AM   #3
simon5 is offline simon5  Canada
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Does a 2SC4613 would work ?
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Old 8th January 2008, 12:26 PM   #4
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I cant use fets as when the device is in low power mode. there inst enough voltage to turn on the gate of a fet. In low power mode the device triggers at 4v and we loose a little bit through the bridge and other components so there inst quite enough at the first switch to turn a Fet fully on.

The device will see pulses of 2.6 Watts @ 130V in full power mode.

I just recieved the hand drawn schematic last night. I will get it into proper format and see if i can get it posted here.

The 2SC4613 looks like a good candidate if its a currently available part.
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Old 8th January 2008, 01:08 PM   #5
Eva is offline Eva  Spain
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Is it a switching or linear application?
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Old 8th January 2008, 02:40 PM   #6
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the transistors act as on/off switches in the front end of a power controller.
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Old 9th January 2008, 08:29 AM   #7
simon5 is offline simon5  Canada
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If 2SC4613 is ok...

May I suggest :
2SC3902
2SC3787
2SA1769
2SA1507
2SA1477
2SC3117
2SC3116
2SC2911
2SA1249
2SA1248
2SA1209

I found transistors in FLP and TP packages, but I guess you don't want those ?
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Old 9th January 2008, 12:27 PM   #8
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Thanks Simon5 those all look very nice. and i like the insulated tab. on these. Plenty of options there to see what i can get. Excellent!



Thank you!


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Old 10th January 2008, 07:43 AM   #9
simon5 is offline simon5  Canada
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Hi again,

Quote:
Originally posted by Zero Cool
Thanks Simon5 those all look very nice. and i like the insulated tab. on these. Plenty of options there to see what i can get. Excellent!
You didn't say if you want me to list FLP and TP package transistors ?

Quote:

Thank you!
No problems, you will be useful to me in the future
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