Electronics Forum: thread (Page 6504 of 7903)

Re: Mounting heights

Electronics Forum | Wed Sep 01 14:07:41 EDT 1999 | Dave F

| For space contracts we have to mount chip capacitors/ resistors etc 0.1 to 0.4 mm from the pad height. | | This is to compenstae for the CTE differential in the substrate/component and also to ensure cleanliness. | | Does anyone have any new idea

Re: track/pad layout

Electronics Forum | Wed Sep 01 14:15:27 EDT 1999 | Dave F

| Help | | I have just received some PCBs with external tracks entering SMD pads at all angles, tangents + 45 degs etc. | | Where can I obtain information as to how tracks should enter SMD pads.? I have looked at several IPC books and got some mino

Re: Classification of moisture sensitive devices

Electronics Forum | Thu Aug 26 08:54:17 EDT 1999 | Dave F

| Having implemented the process of handling moisture sensitive devices our logistics department tries to classify all parts according to their moisture level. | Going through datasheets wasn�t that helpfull, so does anyone know of a source for that

Re: Electrum bar solder

Electronics Forum | Thu Aug 26 08:15:13 EDT 1999 | Brian

| | Has anyone used bar solder from a company called "Electrum Inc." | | What kind of results did you have? | | | | | Hammer: Try: | | Electrum Recovery Works 827 Martin St Rahway, NJ 07065 908-396-1616 800-622-1192 Canada 800-535-1192 Fax: 908-3

Re: Where can I get delmat material

Electronics Forum | Wed Aug 25 10:09:15 EDT 1999 | ray hare

| | Can anyone tell me where I can get a good lightweight material to use for a soldering fixture? I need to make various fixtures to hold LED's vertical during the soldering process, and keep them from floating up off the board surface. | | | | At

Re: Where can I get delmat material

Electronics Forum | Wed Aug 25 10:51:55 EDT 1999 | Peter Barton

| Can anyone tell me where I can get a good lightweight material to use for a soldering fixture? I need to make various fixtures to hold LED's vertical during the soldering process, and keep them from floating up off the board surface. | | At a dif

Re: Where can I get delmat material

Electronics Forum | Thu Aug 26 18:23:21 EDT 1999 | Chad Haima

| Can anyone tell me where I can get a good lightweight material to use for a soldering fixture? I need to make various fixtures to hold LED's vertical during the soldering process, and keep them from floating up off the board surface. | | At a dif

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 07:53:08 EDT 1999 | Scott Davies

| | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | Any help would be appreciated. Thanks. | | | Most common reason is uneven heating where one side of the com

Re: Tombstoning of chip capacitors

Electronics Forum | Wed Aug 25 09:48:28 EDT 1999 | Larry Koens

| | | Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? | | | | | | Any help would be appreciated. Thanks. | | | | | Most common reason is uneven heating where one side

Re: No-clean stencil apertures

Electronics Forum | Wed Aug 25 19:44:35 EDT 1999 | Dave F

| Does anyone have any information on stencil aperture/pad ratios for noclean solder paste. In the past I have experienced severe solder ball problems when using the same size apertures from aqueous products as I do with the No-clean products. Cons


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