Electronics Forum: (4) (Page 86 of 631)

Step Stencil

Electronics Forum | Sat Aug 05 03:09:54 EDT 2000 | Felix

Dear Netters, Could anybody kindly advise : 1. what step stencil means 2. what are its characteristic ?? 3. What special process makes it? 4. What is the application ?? 5. Advantages and limitation ?? just short breifing is enough. Thanks Best

Non-halogenated PCB

Electronics Forum | Wed Jul 19 11:06:42 EDT 2000 | polymer

Where can I find laminates containing non-halogenated PCB? I'm especially interested in FR-4 and CEM-3, 1.6 mm 25um. Thanks in advance! Dr. Lennart Johansson Polymer Support

Re: Universal GSM1 UPS Rev. 1.4

Electronics Forum | Mon Jun 26 16:56:54 EDT 2000 | FlynHi

Why do you want to go to WARP? I hope someone did not suggest WARP was the answer to some problem. I don't think you will have any trouble upgrading to WARP.

Re: Aperture size for Micro BGA stencil

Electronics Forum | Fri Jun 23 09:54:20 EDT 2000 | Dave F

Igmar: Chrys and JAX make good points. I'd like to add that you should be careful that you don't starve larger chip components of solder when using a 4 thou stencil.

Re: RTV Cure Questions

Electronics Forum | Fri Jun 23 14:23:20 EDT 2000 | Brian W.

We used to cure RTV3145 in an oven at 180 F for 2-4 hours Hope this helps, Brian

Re: pre-heat settings for wave solder - Hi Dave F !

Electronics Forum | Wed Jun 21 23:47:28 EDT 2000 | gary

my topside preheat is 97 deg. C and my peak temp. is 230 deg. C with a duration of 4 secs. What would be my Delta ? I suppose 230 minus 97 is equal to 133 deg C...is that right? regards

Re: Micro BGA

Electronics Forum | Fri Jun 09 17:09:23 EDT 2000 | JAX

Khalid, Just from experiance the actual would be 0.4mm but the inspection size would be 0.3mm. This should not matter since you should be able to pull up the spec sheets on any part you place.( All you need is the Vendor and the manufacting part numb

PCB thickness

Electronics Forum | Wed May 17 11:00:00 EDT 2000 | emmanuel

Has somebody yet process pcb (FR4) with a thickness of 0.8 mm ? Thank you for all kind of responses.

Misplaced QFP240 component

Electronics Forum | Wed May 17 03:00:45 EDT 2000 | Avichai Ramot

I have shifts in the placement of qfp240 components. I have this problem with al my IC machines: Fuji-Ip2,Ip3 ,siemens F-4.

G Tech materials for PCB fab

Electronics Forum | Wed May 10 16:49:14 EDT 2000 | Michael Parker

I would like informnation regarding this high heat withstanding type material for PCB, also any other types that are compatible. We currently use FR4 but have an application that may require most advanced composition.

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