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Old 25th October 2010, 12:23 PM   #1
Joku is offline Joku  Finland
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Default Recommend me a cheap NPN power transistor

So, just asking recommendations for a cheap output transistor (NPN). What it should be:

-Cheap
-Preferrably plastic case, like TO-218 or TO-3P
-60W-100W power dissipation
-Decent SOA
-Reasonable voltage and current ratings

And what it does NOT need to be:

-Japanese
-High-end
-Complementary pair is not necessary
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Old 25th October 2010, 01:22 PM   #2
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MJE2955 and MJE3055 are a fairly good and cheap output pair transistors.

2N3055 + MJ2955 are also good.

But be warned, these are relatively slow transistors.

Personally, I prefer MOSFETS as output devices.
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Old 25th October 2010, 01:26 PM   #3
RJM1 is offline RJM1  United States
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How much gain? How much voltage?
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Old 25th October 2010, 02:04 PM   #4
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MJE2955/3055 are TO-220 package.
Something cheap in TO-218 or larger is a golden oldy BD249(C)
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Old 25th October 2010, 03:17 PM   #5
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lot of bang for the buck, on Semi MJL21193, 21194 complimentary. TO-264 package, which is a one screw plastic mount. SOA (safe operating area) 2.25 A 80V 1 sec. Complete datasheet at datasheetcatalog.com. Vce 250 V, Ic 16 A, hfe min 25 @ 8A. .7 degC/W. Was in stock at mouser last time I ordered, under $6 if I remember correctly. Got this from another guy on here, haven't bought any yet but pleased with MJ15015 TO3's made in Mexico I did buy recently at $1.60. Was shocked at the Vce, but apparantly ON is producing lot bigger SOA at 60V on 250V parts than they do in 100V parts, with no particular penalty of reduction in gain or Ft. As far is $1.60 vs $6, probably worth it to not drill 4 precise holes in the heat sink, just one. The one hole package fits my salvage motor drive heat sinks (ribbed .5" spacing) which TO3 does not.
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Last edited by indianajo; 25th October 2010 at 03:25 PM.
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Old 25th October 2010, 04:08 PM   #6
Joku is offline Joku  Finland
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Quote:
Originally Posted by RJM1 View Post
How much gain? How much voltage?
Gain doesn't matter that much, voltage should be at least 60V, or preferrably a bit higher.

Quote:
Originally Posted by indianajo View Post
lot of bang for the buck, on Semi MJL21193, 21194 complimentary. TO-264 package, which is a one screw plastic mount. SOA (safe operating area) 2.25 A 80V 1 sec. Complete datasheet at datasheetcatalog.com. Vce 250 V, Ic 16 A, hfe min 25 @ 8A. .7 degC/W. Was in stock at mouser last time I ordered, under $6 if I remember correctly.
$6 isn't particularly cheap, though. You can get MJ15003 and the MJ15015 you mentioned for less than $2 a pop in eBay.. It's TO-3, but still. I would imagine that TO-218 or such is cheaper package.

Last edited by Joku; 25th October 2010 at 04:26 PM.
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Old 25th October 2010, 09:28 PM   #7
Joku is offline Joku  Finland
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TIP3055 could be pretty good for it's price.. has better SOA than BD249.
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Old 26th October 2010, 04:23 AM   #8
wg_ski is offline wg_ski  United States
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Fairchild has some jap copies out there, and so far I can find nothing wrong with them. In the TO3-P they're under a buck and a half (but more for TO-264).
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Old 26th October 2010, 04:49 AM   #9
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2SC5200 is probably on the higher side of "cheap", but still not too expensive.

Digi-Key - 2SC5200OTU-ND (Manufacturer - 2SC5200OTU)

This place has the SGS version for $1.20, but I can't vouch for the credibility of this vendor.....

2SC5200 NPN 230V 15A 150W Hi-Fi Amplifier

EDIT: They have the Toshiba version as well for $1.50.....

http://www.taydaelectronics.com/serv...30V-15A/Detail

Shop is based in Thailand, but google shows some happy customers from them. Shipping is dirt cheap.

Last edited by theAnonymous1; 26th October 2010 at 04:58 AM.
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Old 26th October 2010, 11:07 AM   #10
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for what application?

TIP35C?
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