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  1. #1
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    Transistor Identification

    I admit that this is a bit on the wild side but I'm having trouble finding either a source to buy a replacement NEC A1441 transistor or to find a source for an equivalent transistor so I repair a power pack

    Does anyone recognise the A1441 and if so can you tell me what is its specificationsor where to look on the web to find them ?

    And

    Is there any equivalent transistor which would do the same job ?

    Thanks in advance

    Max Rieper

  2. #2
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    Re: Transistor Identification

    Not one I'm familiar with - I presume you have tried NEC's website?? The Towers International Transistor Selector book is a well-known source of data on transistors - perhaps your local library has a copy.

    If the power pack is based on a step-down transformer then it may not be terribly important to get an exact substitute. But if it is a switch mode power supply then you would need to know the gory details.

  3. #3
    Plutonium Lounger Leif's Avatar
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    Re: Transistor Identification

    1-source appear to list it. The NEC website doesn't recognise it so it may have been a special. I'll see if I can find out any more when I get to work.

    To be honest, I would be disinclined to attempt a repair - the eventual cost could well be on the way to the price of a full replacement. The other things to bear in mind is that if one component has failed, statistically others will follow soon too, and that the failure of one device may have been caused by the failure of another....

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    Re: Transistor Identification

    Yes I've tried various NEC sites, etc without sucess #$%^&

    Searching for NEC A1441 brings up a few wholesales distributors with mimimum purchases of ca. $US200 !!

    I don't know the Ref book you mention but I'll try and find it on the web

    It does have a stepdown trannie with the secondary voltage 30/60VAC depending on the input being either 115VAC or 240VAC

    So it's a switched mode of some sort

    Awaiting further assistance

    Cheers n Tears
    Max

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    Re: Transistor Identification

    OK Mate

    I await your next epistle

    Cheers n Beers (a nice Pommie Bitters of course)
    Max

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    Plutonium Lounger Leif's Avatar
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    Re: Transistor Identification

    Sorry - unable to unearth anything more. It may be a 2SA1441 - manufacturers often only part-print the part number - but although I can find plenty of hits for it, the NEC search page brings up nothing.

    (I'd prefer a Pilsner from Plzen, thanks!)

  7. #7
    Uranium Lounger viking33's Avatar
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    Re: Transistor Identification

    Hi Max,

    The A1441 is indeed the 2SA1441 transistor. It is a rather old outmoded type that I'm sure has been discontinued by most replacement manufacturers.
    It does cross over to a Sylvania ECG 55 general replacement. The relative age can be determined by the very low 55 number it bears, since the numbering scheme was started at 01 and is now way up there over the thousands point.

    The basic specs are PNP silicon, AF Power Output Amp. TO-220 case. ( I can give the actual detailed specs on it if you would like. )

    To find an oldie like this will probably be a problem, unless someone has a box full stashed away in their archives.
    To avoid the minimum order level, I would probably try some site like eBay to find it at a reasonable price.
    Edited to add: or moyerelectronics.com
    BOB
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  8. #8
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    Re: Transistor Identification

    Thanks agin Lief

    I too have liking fer Pils among many others !!

    SO,

    Cheers n Kronenburgs
    Max

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    Re: Transistor Identification

    ob

    Thanks for the identification info

    I'll shop around and see if I can find a 2SA1441 or its equiv

    Cheers n Carltons
    Max

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    Re: Transistor Identification

    Bob

    I'll take up your offer and ask you to let me have the Tech Specs for the 2SA1441

    Thanks in advance

    Cheers n Beers
    Max

  11. #11
    Uranium Lounger viking33's Avatar
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    Re: Transistor Identification

    Ok Max, Here goes:

    2SA1441
    Subst=ECG55
    Collector to base volts=150
    Collector to emitter volts=150
    Base to emitter volts=5
    Max collector current=8 amps
    Max device dissapation watts=50
    Frequency in MHZ=85
    Current gain=100 (typ)
    Case=TO-220
    Package figure=T41 (looking at device from front) B,C,E.
    Complimentary pair=ECG54

    Doesn't seem to be anything special about the device. Hope this helps.
    BOB
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  12. #12
    Uranium Lounger viking33's Avatar
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    Re: Transistor Identification

    Max,

    There should be many more sources but MOYER ELECTRONICS
    has the 1441 for $4.80 US. I'm sure you should be able to find it elswhere and maybe a better price, with a little shopping.
    BOB
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    Long ago, there was a time when men cursed and beat on the ground with sticks. It was called witchcraft.
    Today it is called golf!

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