Electronics Forum: ipc-d-275 (Page 1 of 2)

Re: Stacking chips

Electronics Forum | Thu May 18 13:08:33 EDT 2000 | Wolfgang Busko

Chris, one question, which standard allows to put it in the drawings/dokumention? As I said in my old IPC-D-275 it says "no". Did it change with the new edition ? Referring to J-STD-001 in this case seems to me like "I followed only the orders and do

Re: Current capability

Electronics Forum | Wed Mar 01 17:13:15 EST 2000 | Dave F

Sorin: Formulas for calculating heat dissipation of traces don�t seem to provide practical results. But there are some wonderful tables and graphs that will meet you needs. You may need to do some finagling when calculating vias and through holes,

Re: Stacking chips

Electronics Forum | Tue May 16 05:45:46 EDT 2000 | Wolfgang Busko

Ashok: Couldn�t find that part in IPC-7711 either. I was just remembering that proposal from that thread mentioned. So you are still in that position I was at that time. Looking into IPC-D-275 (I have to admit that I have only an old issue in my offi

Re: Current capability

Electronics Forum | Wed Mar 01 17:13:15 EST 2000 | Dave F

Sorin: Formulas for calculating heat dissipation of traces don�t seem to provide practical results. But there are some wonderful tables and graphs that will meet you needs. You may need to do some finagling when calculating vias and through holes,

Re: Tables Required for 70Amp PCB's

Electronics Forum | Thu Apr 15 14:56:43 EDT 1999 | Dave F

Can anyone suggest or identifiy standards which tabulate the following: Conductor width, cross sectional and area conductor thickness for PCB's carrying up to 70 Amps? Barry: Check: 1 Printed Circuits Handbook (Clyde F. Coombs) 2 Microel

IPC Spec for PTH Hole Size Tolerance

Electronics Forum | Wed Apr 10 22:23:48 EDT 2002 | davef

IPC-6012A, 3.4.1 has words to the effect of: Hole size tolerance and hole pattern accuracy shall be as specified in the procurement documentation. Our fab says: Standard Drill Sizes Drill Number Hole Size Finished Hole Size 70 0.028" 0.02

IPC Spec for PTH Hole Size Tolerance

Electronics Forum | Wed Apr 10 22:24:30 EDT 2002 | davef

IPC-6012A, 3.4.1 has words to the effect of: Hole size tolerance and hole pattern accuracy shall be as specified in the procurement documentation. Our fab says: Standard Drill Sizes Drill Number Hole Size Finished Hole Size 70 0.028" 0.02

Re: bowtwist

Electronics Forum | Wed Jul 21 20:52:52 EDT 1999 | Scott

I have pcb's in which i am experiencing warping. the boards are 12.8125" on a diagonal measurement. they are out approximatley .010". the boards are combination thru-hole,smt, they also have 3ounce copper.what is acceptable,and what i

Re: bowtwist

Electronics Forum | Thu Jul 22 06:54:45 EDT 1999 | Earl Moon

I have pcb's in which i am experiencing warping. the boards are 12.8125" on a diagonal measurement. they are out approximatley .010". the boards are combination thru-hole,smt, they also have 3ounce copper.what is acceptable,an

Re: Controlled impedance

Electronics Forum | Sun Jan 24 06:44:31 EST 1999 | Kallol Chakraborty

Could anyone send me equations to calculate controlled impedance of traces on circuit boards. I am most interested in the buried traces in multi layer boards. Thanks, David - piengr@verinet.com As one of the first MLB impedan

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