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Old 7th December 2009, 08:39 PM   #1
dacen is offline dacen  Norway
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Default Rohm SMD transistors

Any idea where I can get hold of 2SC3722K and complementary 2SA1455K Rohm SMD transistors
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Old 8th December 2009, 05:42 AM   #2
Bonsai is offline Bonsai  Taiwan
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What is it for? Is it for replacment/repair or new design? Hav e you tried looking at alternatives - Fairchild, On, NXP?
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Old 8th December 2009, 07:04 AM   #3
boholm is offline boholm  Denmark
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Try L C Audio Technology / Forside. They are using them in their ZAPfilter.

Me too is curious: What's it for?
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Old 8th December 2009, 08:06 AM   #4
h_a is offline h_a  Europe
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I don't know these particular ROHM parts, but the complementary ROHM 2SD2391/2SB1561 pair (SMD) you can get from Farnell. Pretty expensive though.

Have fun, Hannes currently having fun with developing a SMD amp ;-)

EDIT: oh I see that's a low noise part - sorry have no alternative at hand!

Last edited by h_a; 8th December 2009 at 08:10 AM.
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Old 8th December 2009, 11:55 AM   #5
dacen is offline dacen  Norway
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It's for repair. Input stage of a power amp. Any suggestions for equivalent types.
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Old 8th December 2009, 02:34 PM   #6
dacen is offline dacen  Norway
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It's for repair. Input stage power amp. LC audio does not answer the mail.
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Old 8th December 2009, 05:03 PM   #7
h_a is offline h_a  Europe
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I see! From experience nice SMD-transistors are hard to get, well in fact everything that would feature properties beyond pure miniaturization (pp-caps or metal film resistors for example) are very hard to get (as DIYer) as SMT.

If there's enough space, could you replace it with a through-hole part? Certainly needs carefull soldering and bending of the leads.

Have fun, Hannes
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Old 8th December 2009, 05:27 PM   #8
dacen is offline dacen  Norway
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Found one of them here. There are three versions of this, suffix R,S and E, each with a different hfe. The exact type for me would be the one with an E, but I will give it a shot. Have not found the complimentary one yet.
Parts for 2sc3722k at TigerDirect Partsearch
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