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Uniform film TaN SMD resistors ?

Discussion in 'Electronic Design' started by Dave Moore, Nov 7, 2006.

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  1. Dave Moore

    Dave Moore Guest

    I've been looking high and low for some Tantalum Nitride
    SMD resistors that are made with a uniformly coated film
    such as many trimmable thick film resistors are made.

    So far, all of the TaN types I've happened upon have
    been thin film types which feature etched serpentine
    patterns instead of my requirement for a uniform
    deposition of resistance material over the entire face
    of the SMD,

    I don't really care if the type is thin or thick, only
    that it's TaN and meet's the aforemention uniformity
    requirement.

    I doubt any mfgr's make anything like this stock, but
    I have to ask. Has anyone seen animals such as these
    stock off the shelf?

    Thanks,
    Dave Moore

    P.S. Thanks John for steering me to the "trimmable" category.
    Unfortunately I haven't yet found any trimmable types made
    with TaN
     
  2. John  Larkin

    John Larkin Guest

    Why TaN?

    I'd guess that some of the low-value parts might be a uniform film.
    You might look at resistors in the 100 ohm and less range.

    John
     
  3. Genome

    Genome Guest

    Just to be absobarstardly stupid.......

    Dennis Moore
    Dennis Moore
    Riding through the Glenn.....

    http://www.jumpstation.ca/recroom/comedy/python/dennis.html

    Cough.

    'I have a cunning plan'
    'Yes, yes, yes. Just put the lupins down'
    'Errr OK, if the manufacturers put spirally things upon them then there must
    have been a time before they put the spirally things upon them'
    'Brilliant, and before I slap you about the head?'
    'I thought we might ask them for some from before the time before they put
    the spirally things on them'
    'Great, well there are two problems here'
    'Yes Sir?'
    'Oh God, it's just too much like hard work.......

    SLAP SLAP SLAP SLAP'

    DNA
     
  4. Dave Moore

    Dave Moore Guest

    :
    : : > I've been looking high and low for some Tantalum Nitride
    : > SMD resistors that are made with a uniformly coated film
    : > such as many trimmable thick film resistors are made.
    : >
    : > So far, all of the TaN types I've happened upon have
    : > been thin film types which feature etched serpentine
    : > patterns instead of my requirement for a uniform
    : > deposition of resistance material over the entire face
    : > of the SMD,
    : >
    : > I don't really care if the type is thin or thick, only
    : > that it's TaN and meet's the aforemention uniformity
    : > requirement.
    : >
    : > I doubt any mfgr's make anything like this stock, but
    : > I have to ask. Has anyone seen animals such as these
    : > stock off the shelf?
    : >
    : > Thanks,
    : > Dave Moore
    : >
    : > P.S. Thanks John for steering me to the "trimmable" category.
    : > Unfortunately I haven't yet found any trimmable types made
    : > with TaN
    : >
    : >
    :
    : Just to be absobarstardly stupid.......
    :
    : Dennis Moore
    : Dennis Moore
    : Riding through the Glenn.....
    :
    : http://www.jumpstation.ca/recroom/comedy/python/dennis.html
    :
    : Cough.
    :
    : 'I have a cunning plan'
    : 'Yes, yes, yes. Just put the lupins down'
    : 'Errr OK, if the manufacturers put spirally things upon them then there must
    : have been a time before they put the spirally things upon them'
    : 'Brilliant, and before I slap you about the head?'
    : 'I thought we might ask them for some from before the time before they put
    : the spirally things on them'
    : 'Great, well there are two problems here'
    : 'Yes Sir?'
    : 'Oh God, it's just too much like hard work.......
    :
    : SLAP SLAP SLAP SLAP'
    :
    : DNA


    OUCH! OUCH! OUCH! OUCH!

    Yeah, I already thought about trying to get some
    before they're etched. Just figgered to exhaust
    other possibilities before going to that extent.
     
  5. Dave Moore

    Dave Moore Guest

    : On Tue, 7 Nov 2006 03:57:15 -0600, "Dave Moore" <>
    : wrote:
    :
    : > I've been looking high and low for some Tantalum Nitride
    : >SMD resistors that are made with a uniformly coated film
    : >such as many trimmable thick film resistors are made.
    : >
    : > So far, all of the TaN types I've happened upon have
    : >been thin film types which feature etched serpentine
    : >patterns instead of my requirement for a uniform
    : >deposition of resistance material over the entire face
    : >of the SMD,
    : >
    : > I don't really care if the type is thin or thick, only
    : >that it's TaN and meet's the aforemention uniformity
    : >requirement.
    : >
    : >I doubt any mfgr's make anything like this stock, but
    : >I have to ask. Has anyone seen animals such as these
    : >stock off the shelf?
    : >
    : >Thanks,
    : >Dave Moore
    : >
    : >P.S. Thanks John for steering me to the "trimmable" category.
    : >Unfortunately I haven't yet found any trimmable types made
    : >with TaN
    : >
    :
    : Why TaN?

    It's a rather novel circuit that I bumbled upon which
    necessitates tapping into to different points on a uniform
    resistive material.
    I'm interested in seeing if the circuit will also work with TaN
    or whether it only functions due to some unique properties
    of NiCr.


    : I'd guess that some of the low-value parts might be a uniform film.
    : You might look at resistors in the 100 ohm and less range.
    :
    : John


    Thanks, but unfortunately I need 1K and up.
     
  6. Chris Jones

    Chris Jones Guest

    If you want a big piece of resistive sheet, you could try those black
    anti-static bags that Farnell sends parts in. I have been trying to think
    of another use for those for years now. You could make a pot or a graphics
    tablet sort of 2D-pot thing. One thing I have observed about those bags is
    that the material seem to be made from a sandwich structure composed of two
    resistive layers with an insulating layer in between.

    Chris
     
  7. Dave Moore

    Dave Moore Guest

    : Dave Moore wrote:
    :
    : >
    : > message : > : On Tue, 7 Nov 2006 03:57:15 -0600, "Dave Moore" <>
    : > : wrote:
    : > :
    : > : > I've been looking high and low for some Tantalum Nitride
    : > : >SMD resistors that are made with a uniformly coated film
    : > : >such as many trimmable thick film resistors are made.
    : > : >
    : > : > So far, all of the TaN types I've happened upon have
    : > : >been thin film types which feature etched serpentine
    : > : >patterns instead of my requirement for a uniform
    : > : >deposition of resistance material over the entire face
    : > : >of the SMD,
    : > : >
    : > : > I don't really care if the type is thin or thick, only
    : > : >that it's TaN and meet's the aforemention uniformity
    : > : >requirement.
    : > : >
    : > : >I doubt any mfgr's make anything like this stock, but
    : > : >I have to ask. Has anyone seen animals such as these
    : > : >stock off the shelf?
    : > : >
    : > : >Thanks,
    : > : >Dave Moore
    : > : >
    : > : >P.S. Thanks John for steering me to the "trimmable" category.
    : > : >Unfortunately I haven't yet found any trimmable types made
    : > : >with TaN
    : > : >
    : > :
    : > : Why TaN?
    : >
    : > It's a rather novel circuit that I bumbled upon which
    : > necessitates tapping into to different points on a uniform
    : > resistive material.
    : > I'm interested in seeing if the circuit will also work with TaN
    : > or whether it only functions due to some unique properties
    : > of NiCr.
    :
    : If you want a big piece of resistive sheet, you could try those black
    : anti-static bags that Farnell sends parts in. I have been trying to think
    : of another use for those for years now. You could make a pot or a graphics
    : tablet sort of 2D-pot thing. One thing I have observed about those bags is
    : that the material seem to be made from a sandwich structure composed of two
    : resistive layers with an insulating layer in between.
    :
    : Chris

    Actually, I need very small, hence the interest in SMD's.
    But thanks for the tip. Should I bumble upon a use for the Farnell
    bags I'll let u know :) er, providing it isn't a million dollar idear.
     
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