[PCB_FORUM] Re: .8-MM BGA Geometry

Hello Tom,

This is my "consensus" part, to get the ball rolling.

Next I need to have my Customer select Fabrication/Assembly/Test Vendors (in
advance!), which will allow me to make any necessary adjustments:

VIA 10-Drill 20-Pad 30-AntiPad 20-Mask-Secondary-Only

PIN 15-Pad 19-Mask-Primary-Only

Thank You,

Richard E Marion
169 Little Mill Road Unit 2
Sandown NH 03873-2554
HOME: 603-887-2266
CELL: 603-247-1610
FAX : 603-887-2936

-----Original Message-----
From: Tom Woznicki [mailto:tom@xxxxxxxxxxxx] 
Sent: Wednesday, September 14, 2005 11:30 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Cc: ricmar@xxxxxxxxxxx
Subject: Re: .8-MM BGA Geometry

Hi Rich and list,
 
I am also working on a board with a 0.8mm SRAM part.  
 
I was sent an Allegro file for a SIM board that the SRAM manufacturer sells.
 
It had 12 mil pads for the SRAM part and 17 mil via pads and a 10 mil drill.
 
However, the pcb was only four layers.
 
Best regards,
 
Tom Woznicki
Flex Circuit Design Company
http://www.flexdude.com/
408-629-8343
 
 
 
In a message dated 9/14/2005 8:01:12 AM Pacific Standard Time,
ricmar@xxxxxxxxxxx writes:
Hello Stephen,

 

The 20/10 Via keeps "popping up", must be a good choice.

 

On the 16-Mil BGA Pad, what diameter Soldermask do you recommend?

 

Thank you for sharing your experience with me.

 

Sincerely,

 

Richard E Marion

169 Little Mill Road Unit 2

Sandown NH 03873-2554

HOME: 603-887-2266

CELL: 603-247-1610

FAX : 603-887-2936

 

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Feehan, Stephen
Sent: Wednesday, September 14, 2005 9:55 AM
To: 'icu-pcb-forum@xxxxxxxxxxxxx'
Subject: [PCB_FORUM] Re: .8-MM BGA Geometry

 

Richard,

 

You can start with a 16 mil bga pad and a  20 mil pad / 10 mil drill with a
28 mil 

anti pad for the via.

 

In some designs I use the via in pin technology for all the gnd pins of a
0.8mm bga. 

The drill of the micro via is 4 mils and is build into the pad. Typically, I
make sure 

Layer 2 is a gnd plane so all the micro vias hit directly into the plane.

 

Call Merix Corp, they have local reps in MA/NH.

 

Stephen

Siemens Communications, Inc

  

 

 


----------------------------------------------------------------------------
----

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Richard E Marion
Sent: Tuesday, September 13, 2005 6:27 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] .8-MM BGA Geometry

Dear Forum,

 

My Client is utilizing a 0.8-MM SDRAM Package.

 

The smallest BGA Pitch I have dealt with so far is 1.0-MM.

 

The Fabrication/Assembly Vendors are yet to be determined.

 

The PCB "target" construction is 0.062-Inch 14-Layer, three sets of dual
embedded stripline. No Blind/Buried Vias (all Thru Via).

 

Questions:

 

1.    Any recommendations for local (NH-MA) Fabrication/Assembly Vendors
capable of working with this BGA Geometry?

2.    BGA SMT Pad Diameter?

3.    BGA SMT Soldermask Diameter?

4.    Thru Via Drill?

5.    Thru Via Pad Diameter?

6.    Alternatively, is Via-In-Pad an option?

7.    Any chance of ATE Testing 0.8-MM Pitch?

 

Thank You,

 

Richard E Marion

169 Little Mill Road Unit 2

Sandown NH 03873-2554

HOME: 603-887-2266

CELL: 603-247-1610

FAX : 603-887-2936

 

 



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