Transistor Selection Help

Zero Cool · 8th January 2008, 04:59 AM

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.

poobah · 8th January 2008, 05:13 AM

Can you make a FET work in your application?

Make is your maximum current?

Do you have a rough idea of power dissipation?

simon5 · 8th January 2008, 08:51 AM

Does a 2SC4613 would work ?

Zero Cool · 8th January 2008, 12:26 PM

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.

Eva · 8th January 2008, 01:08 PM

Is it a switching or linear application?

Zero Cool · 8th January 2008, 02:40 PM

the transistors act as on/off switches in the front end of a power controller.

simon5 · 9th January 2008, 08:29 AM

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 ?

Zero Cool · 9th January 2008, 12:27 PM

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!

Zc

simon5 · 10th January 2008, 07:43 AM

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

8th January 2008, 04:59 AM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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.

8th January 2008, 08:51 AM	#3
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	Does a 2SC4613 would work ? __________________ DIYaudio for President !

8th January 2008, 01:08 PM	#5
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Is it a switching or linear application? __________________ I use to feel like the small child in The Emperor's New Clothes tale

9th January 2008, 08:29 AM	#7
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	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 ? __________________ DIYaudio for President !

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8th January 2008, 05:13 AM	#2
poobah diyAudio Member Join Date: Nov 2005	Can you make a FET work in your application? Make is your maximum current? Do you have a rough idea of power dissipation?

8th January 2008, 12:26 PM	#4
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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.

8th January 2008, 02:40 PM	#6
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	the transistors act as on/off switches in the front end of a power controller.

9th January 2008, 12:27 PM	#8
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	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! Zc

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