Resistor Pack Characteristics

[Norm Dresner]

I've got a bunch of 16-pin resistor packs with 8 individual resistors.
They're the MIL-type (Dale white ceramic DIP) and according to the
information I've been able to unearth, they're a type of thing called a
"thick film resistor network".

1 Doesn't this mean that they're all made on the same substrate at the same
time?

2. Doesn't that imply that whatever values they have, their temperature
tracking (ppm/degC) should be pretty much equal within a single pack?

3. They're 2%. Can I assume anything about the matching of the individual
resistors other than that they won't differ from each other by more than 4%?

5. I've also got a bunch of the non-MIL-spec variety marked with legends
like '16-2-102" which AFAIK mean that they're in a 16-pin package and that
these are 1K (1000) ohm in value. Does the "2" mean 2%? Are these made on
a monolithic substrate or are they discrete or is it impossible to tell?

TIA
Norm

 

[Spehro Pefhany]

On Fri, 20 Aug 2004 19:04:53 GMT, the renowned "Norm Dresner"
<ndrez@att.net> wrote:

I've got a bunch of 16-pin resistor packs with 8 individual resistors.
They're the MIL-type (Dale white ceramic DIP) and according to the
information I've been able to unearth, they're a type of thing called a
"thick film resistor network".

1 Doesn't this mean that they're all made on the same substrate at the same
time?

Yes.

2. Doesn't that imply that whatever values they have, their temperature
tracking (ppm/degC) should be pretty much equal within a single pack?

Probably. But these are not really precision resistors.

3. They're 2%. Can I assume anything about the matching of the individual
resistors other than that they won't differ from each other by more than 4%?

Not IME. Well, their load life and other drift characteristics should
be similar to each other.

5. I've also got a bunch of the non-MIL-spec variety marked with legends
like '16-2-102" which AFAIK mean that they're in a 16-pin package and that
these are 1K (1000) ohm in value. Does the "2" mean 2%?

No, it's the multiplier, just like the color codes. 1 (brown) 0
(black) 2 (red) like a 1K resistor. So 10 ohms would be marked 100.
The rest of it is probably a manufacturer-specific model number.

Are these made on
a monolithic substrate or are they discrete or is it impossible to tell?

They are made from a special ink screened onto a ceramic substrate,
which is then fired in an oven at fairly high temperatures (maybe
800'C), and finally the resistors are tweaked by abrasive or laser
trimming. The leads are attached to the substrate at some point and
the product is packaged in epoxy or whatever and marked.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Peter Bennett]

On Fri, 20 Aug 2004 19:04:53 GMT, "Norm Dresner" <ndrez@att.net>
wrote:

5. I've also got a bunch of the non-MIL-spec variety marked with legends
like '16-2-102" which AFAIK mean that they're in a 16-pin package and that
these are 1K (1000) ohm in value. Does the "2" mean 2%? Are these made on
a monolithic substrate or are they discrete or is it impossible to tell?

TIA
Norm

Bourns uses the middle number to indicate the circuit - whether there
are several independent resistors in the package, or if they are
interconnected in some manner.

A 16 pin DIP package could have 8 independent resistors, or might have
15 resistors, with one end of all resistors tied together and
connected to pin 16.


--
Peter Bennett VE7CEI
email: peterbb4 (at) interchange.ubc.ca
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