Lead (Pb) Free RoHS compliance Status and Plans - Analog Devices, Inc.
Revision 16 - January 2007

Objective

Satisfy customer and governmental requirements for eliminating Pb from our product in a time frame consistent with the market and well in advance of the Euro "WEEE" and other legislation.

Issues

1. Materials Set. Re-engineer a material set (molding compound and die attach epoxy) so devices can withstand a +255°C (+5/–0°C) reflow temperature necessary for some Pb free solder paste/ terminal finish systems. The material set has been chosen for maximizing the moisture sensitivity level performance of the devices, ensuring RoHS compliance of the package, and minimally impacting our product cost structure, while progressing at a pace ahead of the industry. Conversion of packages listed in PCN #02_0011 is complete. Conversion of packages listed in PCN #04_0065 is nearing completion, with one package type to be converted in April 2007.
   
   
2. Terminal Finish. Choose terminal finish that does not contain Pb, does not result in degraded device performance or reliability, and meets industry soldering requirements. Given the current needs of our customers, we have decided to offer matte tin (Sn) and gold (Au) Pb Free plating and tin/silver/copper (Sn/Ag/Cu) solder spheres for volume applications. We will also continue to offer SnPb plating for device types currently available with SnPb finish. RoHS compliant devices with a Pb Free finish will be designated with a "Z" suffix in the part number.
   
   
3. Transition. For leadframe based devices, we have not experienced backward compatibility issues as we convert to Pb Free terminal finishes and materials. BGA devices with Pb Free solder spheres are not backward compatible when reflowed at low temperatures. Please refer to the following charts for implications:

Leadframe Parts:

BGA:

Position

A number of FAQ's are on a separate web page within this site. They may be very helpful for providing specific information and are referenced with regard to some of the topics below.

ADI now offers over 10,000 catalogue device types that are RoHS compliant and have a Pb Free terminal finish. A handful of product specific qualifications are in progress and should be completed 1H07. We continue to add Pb Free RoHS compliant versions as requests for high temperature reflow compatible products come in.

1. Materials Set. Our initial group of high volume plastic packages has completed qualification for high temp reflow compatibility. These packages are now constructed so they can withstand the +255°C (+5/–0°C) peak reflow temperature. Mechanical samples are available for customers. (See the FAQ sheet for "How do I obtain Pb Free RoHS Compliant Samples?" for more information.) Analog Devices has issued PCN (Process Change Notification) #02_0011 (Original issue: November 2, 2001, Revision 8: May 15, 2004) to change to materials compatible with higher peak reflow temperatures. The conversion to the new materials for production of packages included in this PCN started in February 2002 and is complete. The packages listed in PCN #04_0065 (Original issue: April 2004, Revision 5: January 5, 2007) will complete conversion over the next few months.
   
   
2. Terminal Finish. Based on input from our customer base, ADI is offering Pb Free plating (Sn and Au), as well as SnPb plating concurrently for volume applications. A post Sn plating ("anneal") bake – one hour at 150°C within 24 hours of plating – has been implemented on some assembly lines since inception of Sn plating. To standardize process flows and satisfy customer requests, this post plating bake has been implemented across ADI assembly sites starting with EIA date code 0522 (May 29-Jun 4, 2005). Implementation has been supported by no change in fit, form, or function of ADI devices and no degradation in solderability.
   
   Sn whisker test data collected to date using JEDEC JESD22A121 test conditions indicates whisker lengths meet the JEDEC JESD201 criteria for class ratings of 2, 1, and 1a. For more information, refer to the Tin Whisker Report available at this site. ADI continues to monitor the progress of industry task forces and the recommendations of other industry organizations and will make any updates through this web site.
   
   ADI is also selectively adding a Sn3.0Ag0.5Cu solder ball device type for BGA product. Because of concerns about the forward/backward compatibility of SnPb and Sn/Ag/Cu solder spheres under high and low reflow temperatures, we will continue to offer SnPb solder spheres as well. We have qualified Pb Free solder spheres on mini-BGA and PBGA packages and have converted several customer specific specials.
   
   
3. Transition. We have developed a detailed plan per a structured TQM methodology that will allow smooth transition to Pb free RoHS compliant devices for our customers.
   
   Customers have been notified by PCN (Process Change Notification) #02_0011 (Original issue: November 2, 2001, Revision 8 : May 15, 2004) and PCN #04_0065 (Original issue: April 2004, Revision 5: January 5, 2007). These PCNs have provided over 90 days notice as we change material sets to meet a +255°C (+5/–0°C) reflow temperature. These PCNs have also tracked our progress on qualification of our Pb Free RoHS compliant option for a number of packages. Our motivation for issuing the PCNs has been to obtain customer input. We have received valuable input from our customers on the development of our strategy which we greatly appreciate. We look forward to continued customer input.
   
   We continue to emphasize converting material sets so our high volume plastic leaded products can be used with Pb Free solder paste and a +255°C (+5/–0°C) temperature reflow, whether with an SnPb or Pb Free finish.
   
   We ask for our customers' cooperation as we work through inventory issues on a few of our device types.
   
   For most of the 10,000 catalogue device types that are RoHS compliant and have a Pb Free finish, the device part numbers will contain the letter "Z". (See the FAQ sheet for "Do all Pb Free RoHS compliant parts have a 'Z' at the end of the part number?")
   
   Devices that are Pb Free and RoHS compliant will be marked as such on the packaging box label as shown below. "Pb free", Peak Package Body Temperature, and "RoHS Compliant" have been added to the label as of Dec 2004. Updates to the labels are planned before March 1, 2007 to comply with the requirements of "China RoHS." Any changes will be documented at this site.
   
   
   
   
   
   Pb Free RoHS compliant devices will also have a "#" marked on the device to denote Pb Free RoHS compliance, except in cases where there is not room for an additional character such as SOT23, SC70 and TSOT. (See the FAQ sheet for "What is the standard naming convention for Pb Free RoHS compliant parts?" and "How will the parts be marked?") We will adopt an industry standard marking and eliminate the "#" as our Pb Free marking if an acceptable industry standard is developed. If we adopt an industry standard we will announce conversion to the new standard via a PCN.

The status of our conversion effort is as follows:

"Qualified" means the higher volume lead counts within a package family are qualified. In some cases we are continuing work to obtain data on additional lead counts or products within a package family.

Some packages are Qualified per the exemptions in the EU RoHS regulation. These exemptions include Pb in glass, 85+% high Pb solder in die attach material or solder bump, and Pb in solder forming the interconnection between the die and substrate in flip chip packages. These exempted products are currently labeled as "Pb Free" and/or "RoHS Compliant."

A "Solder Joint Reliability" report is now available on request.

Hermetic package types where the finish is currently gold plating (FP, LCC, JLCC, PGA, CQFP, and select Header) are also being converted to Pb Free RoHS compliant (label change only). Affected products have or will have a new Pb Free RoHS compliant label on the shipping boxes.

We will continue to update our Customers and Sales Force through this web site. Customer comments and questions on our "Lead Free RoHS Compliance Program" are welcome and should be directed to:

ADI Pb-Free Group:
World Wide Manufacturing, Analog Devices
804 Woburn St.
M/S 611
Wilmington, MA 01887
Fax: 781-937-1741
Email: ADI.PbFree@analog.com

Rev. 16 - 01/5/07