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Old 18th September 2013, 12:50 AM   #1
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Default 2sc2240 Equivalent

I'd like to replace the 2sc2240 BL differential pairs in the driver board of an Adcom GFA-555. These are getting pretty scarce and i'll need quite a few to find some that are close.

Can someone suggest a current production equivalent?

Last edited by Captn Dave; 18th September 2013 at 12:56 AM.
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Old 18th September 2013, 06:44 AM   #2
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I think the 2SC3324 is the SMT version of that part if you're up for doing a little physical and mechanical modification. They seem to be readily available from the usual sources.

The Fairchild KSC1845 may be a viable candidate in TO-92.

Dale
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Old 18th September 2013, 07:15 AM   #3
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Quote:
Originally Posted by dchisholm View Post
I think the 2SC3324 is the SMT version of that part Dale
The datasheet power dissipation spec for the 2SC2240 TO-92 is 300mW.
The datasheet power dissipation spec for the 2SC3324 SMT is 150mW.

It is probably worth the extra trouble and cost to find some NOS of 2SC2240 BL.

Perhaps the diyAudio Krell KSAxx Klone threads would have vendor info.
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Old 18th September 2013, 07:23 AM   #4
kcray is offline kcray  Indonesia
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Also, Hfe wise, BC546C (C grade) is closely match the 2SC2240BL (BL Grade), but voltage rating (Vcbo and Vceo) differ quite a lot.
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Old 18th September 2013, 08:16 PM   #5
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Quote:
Originally Posted by LineSource View Post
The datasheet power dissipation spec for the 2SC2240 TO-92 is 300mW.
The datasheet power dissipation spec for the 2SC3324 SMT is 150mW.
That difference is due to the device packaging, not the internal silicon die itself. In a particular circuit application the power dissipation capability may indeed be a dominant factor for device selection. For a small-signal stage where idle current is a few mA and collector-emitter voltage only a dozen volts or so, the SMT part is an easy electrical substitution for the thru-hole version. (The mechanical and physical fit is, of course, more problematical.)

Where higher power dissipation is a legitimate requirement, such as a predriver, the low noise and high gain of the 2SC2240 are typically less critical and other TO-92 devices - even though electrically dissimilar to the 2SC2240 - are good candidates for substitution.

In the larger scope of things, I don't think the advice to "buy up the NOS wherever you can find it" really solves the problem. The original request to identify a current production part, even if using it requires some modifications, strikes me as the wiser approach.

Dale
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Old 18th September 2013, 08:49 PM   #6
Salas is online now Salas  Greece
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I did not have a 546C handy, but here is a 550C Philips and a Toshiba C2240BL.
Plus a 560C & A970BL. The A970BL shows ~same Early to its complementary nonetheless. (The BCs have 3-4 times the 2SC's-2SA's Rbb' which matters only in low noise applications).
Attached Images
File Type: png 550.png (29.3 KB, 454 views)
File Type: png 2240.png (29.9 KB, 448 views)
File Type: png 560.png (30.1 KB, 443 views)
File Type: png 970.png (30.9 KB, 443 views)
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Old 18th September 2013, 09:40 PM   #7
dacen is offline dacen  Norway
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Ampslab have guaranteed originals (2SC2240) . Have a look here: Original Small Signal Audio Bipolar Transistors - Buy OnLine @ AmpsLab
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Old 19th September 2013, 03:35 AM   #8
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What's wrong with these from bdent? Too expensive?

B+D Enterprises - 2SC2240BL
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Old 24th September 2013, 04:48 AM   #9
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Use these: Stock, current guaranteed cheap new parts from Mouser, Digi Key, any authorised dealers.
Fairchild KSC1845/A992.
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Old 1st March 2014, 01:32 AM   #10
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Default 2SC2240: --> 2SC2459 2SC3324

Quote:
Originally Posted by Captn Dave View Post
I'd like to replace the 2sc2240 BL differential pairs in the driver board of an Adcom GFA-555. These are getting pretty scarce and i'll need quite a few to find some that are close.

Can someone suggest a current production equivalent?
Hi,
Here's an extract from an old TOSHIBA Small Signal Transistor data book:

Having worked in Japan for 5 years, there really are no western equivalents, in TO-92 (or SC-43 as the Japanese refer to them) hole through packages to the discontinued TOSHIBA or HITACHI/RENESAS BJTs with low noise and low Rbb.

I would love to find an equivalent to the Renesas 2SC2547-D, aside from low noise, low Cob and an Rbb in the region of 12.5 ohms, there is no other device from the likes of ON, Fairchild or NXP.
Renesas killed off their small-signal hole through parts after they nearly hit the wall in 2008. They did hit the wall in 2012 - these guys couldn't market themselves out of a wet paper bag!

I have used BC338-40, the Rbb circa 30 ohm, so need at least two in parallel (better than BC550C @ around 150 ohm), noise characteristics and input capacitance are not too removed from those of the 2SC2240-GR, however the voltage and current characteristics are quite different along with Cob etc
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File Type: png TOSHIBA Package x-ref.png (120.5 KB, 291 views)

Last edited by Celestial; 1st March 2014 at 01:59 AM.
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