Rohm SMD transistors

dacen · 7th December 2009, 08:39 PM

Any idea where I can get hold of 2SC3722K and complementary 2SA1455K Rohm SMD transistors

Bonsai · 8th December 2009, 05:42 AM

What is it for? Is it for replacment/repair or new design? Hav e you tried looking at alternatives - Fairchild, On, NXP?

boholm · 8th December 2009, 07:04 AM

Try L C Audio Technology / Forside. They are using them in their ZAPfilter.

Me too is curious: What's it for?

h_a · 08:10 AM

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!

dacen · 8th December 2009, 11:55 AM

It's for repair. Input stage of a power amp. Any suggestions for equivalent types.

dacen · 8th December 2009, 02:34 PM

It's for repair. Input stage power amp. LC audio does not answer the mail.

h_a · 8th December 2009, 05:03 PM

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

dacen · 8th December 2009, 05:27 PM

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

7th December 2009, 08:39 PM	#1
dacen diyAudio Member Join Date: Jul 2006	Rohm SMD transistors Any idea where I can get hold of 2SC3722K and complementary 2SA1455K Rohm SMD transistors

8th December 2009, 05:42 AM	#2
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	What is it for? Is it for replacment/repair or new design? Hav e you tried looking at alternatives - Fairchild, On, NXP? __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

8th December 2009, 07:04 AM	#3
boholm diyAudio Member Join Date: Apr 2004 Location: Copenhagen	Try L C Audio Technology / Forside. They are using them in their ZAPfilter. Me too is curious: What's it for? __________________ Best regards Bo

8th December 2009, 08:06 AM	#4
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	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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8th December 2009, 11:55 AM	#5
dacen diyAudio Member Join Date: Jul 2006	It's for repair. Input stage of a power amp. Any suggestions for equivalent types.

8th December 2009, 02:34 PM	#6
dacen diyAudio Member Join Date: Jul 2006	It's for repair. Input stage power amp. LC audio does not answer the mail.

8th December 2009, 05:03 PM	#7
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	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

8th December 2009, 05:27 PM	#8
dacen diyAudio Member Join Date: Jul 2006	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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