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Old 11th September 2006, 09:35 PM   #1
kubeek is offline kubeek  Czech Republic
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Default higher voltage than BC550/560?

Hello,

Could anyone please suggest some low-noise transistor complimentary pair with higher C-E voltage than the BC550/560?
Thanks

I just have seen one 550 died in a circuit where there should be voltage of max 40V across it, it ended with B-E short circuit...
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Old 11th September 2006, 09:38 PM   #2
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bc546/bc556
2sa970/2sc2240
2n5401/2n5551
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Old 11th September 2006, 09:43 PM   #3
kubeek is offline kubeek  Czech Republic
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darkfenriz: that was quite quick, thanks again!
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Old 11th September 2006, 09:44 PM   #4
Netlist is offline Netlist  Belgium
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Does it have to be low noise?

/Hugo
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Old 11th September 2006, 09:46 PM   #5
kubeek is offline kubeek  Czech Republic
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It would be better, current source in diff stage should not be too noisy, right?
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Old 11th September 2006, 09:51 PM   #6
Netlist is offline Netlist  Belgium
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Then 2sa970 / 2sc2240 would be a good choice.

/Hugo
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Old 11th September 2006, 10:19 PM   #7
kubeek is offline kubeek  Czech Republic
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From the datasheets it seems to me that all thees transistors are similar in terms of noise:
BC550 - noise figure 1.4 - 3 dB
2SA970 - 2 - 6 dB
2N5551 - max. 8dB

so there is no big difference (is the noise figure the right parameter to look for?)
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Old 12th September 2006, 05:18 PM   #8
AndrewT is offline AndrewT  Scotland
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How about 872/1775 available in 90 or 120Vce0.
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regards Andrew T.
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Old 12th September 2006, 05:42 PM   #9
kubeek is offline kubeek  Czech Republic
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What is the prefix of these? I am not too familiar with probalby japan numbering.
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Old 12th September 2006, 05:50 PM   #10
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2SA872, 2SC1775

The 1775A was a favorite of Hiraga/L'audiophile but you will find it harder to source.
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