Resistor package help

On Sun, 17 Aug 2008 19:45:34 +0200, Richard Herman

<postbus@het-audio-team.removethis.nl> wrote:

Ron Owens schreef:

Jim Littlefield wrote:

Steve Jacobson wrote:

What resistor packages would I use for a standard 1/4 and 1/2 w

resistor?

 

Thanks

 

 

I assume you mean SMT? There are a lot of standard sizes.   I think

you can get 1/4W in 0805 and up.   1/2W generally requires 1206 or

larger.  Footprints for these parts should be in the standard library

(rcl.lib?)  Some current sense resistors have not so standard

footprints so you may have to create a library part.

 

jiml

 

For through hole parts you may have to make your own. I couldn't find

any in the standard libraries that come with Eagle. I recommend you

create them in the resistor library.

 

All the resistors, capacitors and inductors are in the rcl.lib.

If you make your own parts i would strongly recommend also making your

own library file that holds such parts. That way you won't lose your

additions after an Eagle update. you could use use the 'original' Eagle

name and prefix this with you initials: jl_rcl.lib for instance. It's

easier than having to make up your own library names. A seperate

directory for those lib files ie. a subdir under 'My doucuments'

(windows) makes it easier to backup. You can add the extra paths in the

Control Panel > Options > Directories.

 

HTH

Richard Herman

I ended up making my own.  It turns out that the 0207/12 package is identical to

a 1/4 w resistor.  I guess that the Eagle code is xx yy/zz where xx is the body

diameter (in this case, 2mm), yy is the body length (7mm in this case), and zz

is the hole spacing for the leads (in this case 12mm).  There is an 0207/15, but

the lead spacing is too big.

Is this true of the other Eagle Library components?

Steve

On Sun, 17 Aug 2008 19:45:34 +0200, Richard Herman

<postbus@het-audio-team.removethis.nl> wrote:

Ron Owens schreef:

Jim Littlefield wrote:

Steve Jacobson wrote:

What resistor packages would I use for a standard 1/4 and 1/2 w

resistor?

 

Thanks

 

 

I assume you mean SMT? There are a lot of standard sizes.   I think

you can get 1/4W in 0805 and up.   1/2W generally requires 1206 or

larger.  Footprints for these parts should be in the standard library

(rcl.lib?)  Some current sense resistors have not so standard

footprints so you may have to create a library part.

 

jiml

 

For through hole parts you may have to make your own. I couldn't find

any in the standard libraries that come with Eagle. I recommend you

create them in the resistor library.

 

All the resistors, capacitors and inductors are in the rcl.lib.

If you make your own parts i would strongly recommend also making your

own library file that holds such parts. That way you won't lose your

additions after an Eagle update. you could use use the 'original' Eagle

name and prefix this with you initials: jl_rcl.lib for instance. It's

easier than having to make up your own library names. A seperate

directory for those lib files ie. a subdir under 'My doucuments'

(windows) makes it easier to backup. You can add the extra paths in the

Control Panel > Options > Directories.

 

HTH

Richard Herman

I ended up making my own.  It turns out that the 0207/12 package is identical to

a 1/4 w resistor.  I guess that the Eagle code is xx yy/zz where xx is the body

diameter (in this case, 2mm), yy is the body length (7mm in this case), and zz

is the hole spacing for the leads (in this case 12mm).  There is an 0207/15, but

the lead spacing is too big.

Is this true of the other Eagle Library components?

Steve