AN1850 Freescale Semiconductor / Motorola, AN1850 Datasheet

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AN1850

Manufacturer Part Number
AN1850
Description
Flip-Chip PBGA Package Construction Assembly and Board-Level Reliability
Manufacturer
Freescale Semiconductor / Motorola
Datasheet
Application Note
Flip-Chip PBGA Package ConstructionÑ
Assembly and Board-Level Reliability
Motorola introduced the ßip-chip plastic ball grid array (FC PBGA) packages as an alternative to, and in
some cases a replacement package for, PowerPCª microprocessors and related chips that are currently
packaged predominately in ceramic BGA (CBGA). This application note is designed to assist both current
CBGA and Þrst time BGA users to reliably deploy MotorolaÕs FC PBGA technology into their assembly
processes and products from an interconnect perspective.
1.1 General Package Information
The FC PBGA has a similar general conÞguration to the CBGA, but there are several major differences in
the packages. The two most signiÞcant differences are as follows:
A cross-section of each package type is shown in Figure 1 through Figure 4 and includes higher
magniÞcation cross-sections of the two solder-ball types. Additionally, because the PBGA package
employs near-eutectic solder balls, there is no eutectic solder paste volume requirement for assembly, as
compared with the CBGA package. For successful FC PBGA assembly, solder paste or ßux must be
successfully applied to each motherboard pad.
The CBGA is qualiÞed to JEDEC moisture sensitivity level (MSL 1), meaning it is resistant to moisture-
induced damage during reßow. The epoxy/glass substrate of the FC PBGA results in the package being
moisture sensitive. The FC PBGA is currently qualiÞed to MSL 3. FC PBGA devices are shipped dry-
packed and after the drypack is opened, packages must either be stored at less than 20%RH or soldered
within 168 hrs of exposure to 30°C/60%RH. Packages that are not soldered within 168 hrs must be baked
for 24 hrs at 125°C prior to assembly. Table 1 outlines the major differences between the two package types.
This document contains information on a new product under development by Motorola.
Motorola reserves the right to change or discontinue this product without notice.
© Motorola, Inc., 2000. All rights reserved.
¥
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Semiconductor Products Sector
The FC PBGA is based on an epoxy/glass organic, as opposed to a ceramic substrate
The FC PBGA uses 62Sn36Pb2Ag solder balls that melt in the solder reßow process, while the
CBGA uses 90Pb10Sn solder balls.
Order Number: AN1850/D
Rev. 0, 5/2000

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AN1850 Summary of contents

Page 1

... Table 1 outlines the major differences between the two package types. This document contains information on a new product under development by Motorola. Motorola reserves the right to change or discontinue this product without notice. © Motorola, Inc., 2000. All rights reserved. Order Number: AN1850/D Rev. 0, 5/2000 ...

Page 2

General Package Information Table 1. Comparison of MotorolaÕs FC PBGA and CBGA Packages Package Attribute Substrate dielectric material Substrate CTE (ppm/°C) Solder ball composition (weight %) Solder ball diameter (mm) Package solder pad diameter (mm) Package solder pad type Entire ...

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Figure 1 through Figure 4 show a cross-section of each package type. Figure 1 and Figure 3 do not show the die and are not approximately proportional. Solder joint pictures are only approximately proportional. Figure 1. FC PBGA Package Mounted ...

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General Package Information Figure 3. CBGA Package Mounted to a Board 4 Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability Figure 4. CBGA Solder Joint ...

Page 5

Motherboard Solder Pad Geometries Figure 5 and Figure 6 contain the recommended solder pad geometries for the FC PBGA and the CBGA, respectively. A pad with a 0.58 mm diameter solderable surface that is 0.05 mm smaller than the ...

Page 6

Surface Mount Assembly Via Solder Pad Vi a Figure 6. Recommended CBGA Motherboard Solder Pad Geometry. 1.3 Surface Mount Assembly The board assembly process for FC PBGA is basically the same as for CBGA with a couple of exceptions. Due ...

Page 7

Board-Level Reliability The two package types behave quite differently with regard to the solder jointÕs ability to withstand repeated board-mounted thermal cycles. The CBGA substrate, with a coefÞcient of thermal expansion (CTE) of 6.7 ppm/¡C, is mismatched to most ...

Page 8

Board-Level Reliability Motorola has extensive board-level reliability data on every CBGA body size used for products. Figure 7 contains solder-joint reliability data for the 503-pin, 32.5 mm body Motorola XPC107 mounted to a 1.57- mm thick, four-copper-layer FR-402 epoxy/glass test ...

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Figure 8. Motorola 503-Pin CBGA Package Drawing Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability 9 ...

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Board-Level Reliability Figure 8. Motorola 503-Pin CBGA Package Drawing (Continued) 10 Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability ...

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Figure 9. Motorola 503-Pin Flip-Chip PBGA Package Drawing Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability 11 ...

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Board-Level Reliability Figure 9. Motorola 503-Pin Flip-Chip PBGA Package Drawing (Continued) 12 Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability ...

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Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability 13 ...

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Board-Level Reliability 14 Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability ...

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Flip-Chip PBGA Package ConstructionÑ Assembly and Board-Level Reliability 15 ...

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... HOME PAGE: http://motorola.com/semiconductors Document Comments: FAX (512) 895-2638, Attn: RISC Applications Engineering World Wide Web Addresses: http://www.motorola.com/PowerPC http://www.motorola.com/netcomm http://www.motorola.com/Coldfire are registered trademarks of Motorola, Inc. Motorola, Inc Equal Opportunity/ - TOUCHTONE 1-602-244-6609 - US & Canada ONLY http://sps.motorola.com/mfax AN1850/D ...

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