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EAGLE User Support (English) Eagle PCB Layout Editor PNP Transistor E and C pins swapped?
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  • transistor
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Eagle PCB Layout Editor PNP Transistor E and C pins swapped?

Former Member
Former Member over 9 years ago

Device -> BC557B-PNP-TO92-EBC (*-PNP-)

Package -> TO92-EBC

Library -> transistor

 

Are the E and C pins swapped somehow when you design the board?

The orientation of the transistor (silkscreen) on the board doesn't comply to datasheets of the above mentioned device.

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  • autodeskguest
    0 autodeskguest over 9 years ago

    On 19/06/2016 2:22 a.m., H.J. Windt wrote:

    Device -> BC557B-PNP-TO92-EBC (*-PNP-)

    Package -> TO92-EBC

    Library -> transistor

     

    Are the E and C pins swapped somehow when you design the board?

    The orientation of the transistor pin outs on the board doesn't comply to datasheets of the above mentioned device.

     

     

    I believe you are correct.

    I'm looking in Eagle 7.5

     

    There are many transistors in the transistor libraries using the package

    TO92-EBC that are incorrect.

     

     

    There is also the following package with an incorrect name

    Library =  transistor-pnp.lbr

    Package =  TO92-EBC.pac

    The pads are actually CBE

     

    Perhaps Cadsoft will assign someone to clean up all the  transistor

    libraries.

     

    HTH

    Warren

     

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  • autodeskguest
    0 autodeskguest over 9 years ago

    Am 18.06.2016 um 16:22 schrieb H.J. Windt:

    Device -> BC557B-PNP-TO92-EBC (*-PNP-)

    Package -> TO92-EBC

    Library -> transistor

     

    Are the E and C pins swapped somehow when you design the board?

    The orientation of the transistor pin outs on the board doesn't comply to datasheets of the above mentioned device.

     

    --

    To view any images and attachments in this post, visit:

    https://www.element14.com/community/message/199680

     

     

    Without further looking I remember that these TO92 packages were really

    some bullshit even far back in version 4.16 image

    Normally in eagle the pads of a device have NUMBERS the symbols have

    NAMES and in the devises the pin names are connected to the

    corresponding pad numbers.

    AFAIK there are only 2 versions of TO92 were pads are in a row or are in

    a triangle and all of them are numbered 1,2,3 and that is it.

    Cadsoft should really clean this mess up.

    For H.J. Windt I suggest to open your own library copy the devices into

    it and rename the pads correctly according the data sheet.

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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  • Former Member
    0 Former Member over 9 years ago

    Thanks for the responses!

    I hope that Cadsoft does do something about this.

    Picture below shows part of the schematic, board (blue top left is Vcc) and transistor in the working circuit.

    image

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  • Oppie
    0 Oppie over 9 years ago

    "H.J. Windt" <noreply-216820@element14.com> wrote in message

    news:1576150480.01466259758953.JavaMail.jive@e14-cr-vp-appj8-04.premierfarnell.net...

    Device -> BC557B-PNP-TO92-EBC (*-PNP-)

    Package -> TO92-EBC

    Library -> transistor

     

    Are the E and C pins swapped somehow when you design the board?

    The orientation of the transistor pin outs on the board doesn't comply to

    datasheets of the above mentioned device.

     

    There were several variations of the TO91 package. When using one, I always

    confirm manufacturer's data against library .dev data. One reason why I

    usually put a working library in the project folder. I can edit things on

    the fly and not be worried that any changes will result in problems with

    other uses of the device.

     

     

     

     

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