End-of-Life: When & How to Prepare for Product Redesign

We have covered the key stages of semiconductor lifecycle management (SLiM) for the military/aero component supply chain in previous blogs, and now we'll be looking at several of the key aspects of a successful SLiM program. The preceding articles discussed wafer storage and management and managing fabrication and testing conversion. This article will take a look at extending the supply of key components by undertaking a complete redesign of the product, package, and test programs. (See: Nuts & Bolts of Semiconductor Lifecycle Management, Part 1, Nuts & Bolts of Semiconductor Lifecycle Management, Part 2, and Wafer Storage & Management for Extending Product Lifecycle.)

The primary method for supplying obsolete devices to military contractors is to deliver excess finished goods and product assembled from a wafer die bank. By obtaining rights to, and purchasing, excess stock after the last-time-buy, the typical obsolescence supplier provides support for key program requirements. However, this methodology is limited to the material available at the time wafer fabrication ceases, as many aftermarket suppliers cannot manufacture additional devices.

Once the material from an authorized supplier has been depleted, contractors are forced to search the globe for more, often having to deal with brokers and resellers that may not have the same quality or level of traceability to the fabrication source. This introduces a significant risk as the product may not be authentic and creates the possible introduction of counterfeit devices. In aerospace and defense programs counterfeit devices cause serious risk to the quality and reliability of the end systems, which will cost programs dearly.

The ideal scenario for military programs is to work with a supplier that can indefinitely extend the lifetime of critical devices, completely eliminating the obsolescence issue. The most valuable SLiM provider will have the capability to extend the life of products by executing complete product redesign. This would include the management of a suitable wafer fab facility, test program redevelopment, and completion of the required product qualification.

The new production flow will possess all of the necessary quality controls to meet the stringent requirements of key military and aerospace programs. This strategic SLiM supplier will also be able to obtain full SMD approval, allowing military contractors to purchase the new devices to the exact same specifications as the original device, without the need for modification or redesign of their system.

The ideal SLiM supplier will anticipate the needs of military programs and undertake redesign in advance of the exhaustion of existing material. By working closely with original semiconductor manufacturers, the SLiM supplier will have access to previous purchasing patterns and be able to predict usage rates, enabling a completed redesign effort in time to ensure an uninterrupted supply of devices to the program.

Frequently there are cases where a semiconductor device has not achieved widespread usage, and a single program will need a device redesigned to extend the lifetime of the system. Alternatively, a program may receive orders exceeding the forecasted demand at the time of the last-time-buy on a device, and will need to find a SLiM provider that can redesign that critical component.

The contractor will then need to complete the cost analysis trade-off of a system redesign versus the costs of a semiconductor device redesign. The cost of a device redesign will often be less than that of a system redesign, with the required re-validation and re-qualification of the entire system.

In these scenarios, a successful SLiM supplier will offer custom redesign capability to support specific programs along with the high-quality production capability and sales and distribution channels that meet their needs.

5 comments on “End-of-Life: When & How to Prepare for Product Redesign

  1. mfbertozzi
    June 10, 2011

    Good to know Joseph, it was a lesson for me to learn how complex is the process. I was wondering if there is also any correlation between redesign an regions in which Army will plan to start (unfortunately) some activities: I mean desertic regions could require customized component or productions to preserve electronics from sands and maybe the approach could be similar in case of activities at large in the ocean. It could be interesting to collect some basic infos about.

  2. MarkofWorldMicro
    June 10, 2011

    Great article.  I could not agree with you more that the tradtional distribution and OCM's have not built a good system to support the key needs of long life applications. For years, World Micro has been partnering with companies to help provide this service. One of the companies that immediately comes to mind is Tekmos ( There niche and rise to prominence is coming by helping to satisfy this very need. They have a host of products that are drop in replacements for obosleted products from brands like Altera, Xilinx, Atmel, and NXP. Historically, at the OCM's, when the commercial volume winds down on thiese devices, they will issue EOL and LTB notices. Tekmos recognized the need for a safe stable supply line of ASIC and CMOS based product to support aerospace, medical, and defense that have longer life cycles. This fabless semi company is charting a proactive path to help keep our defense and medical worlds safe! (For transparency: World Micro is an authorized distributor of Tekmos.)

    June 10, 2011

    Great article.  We sold a an RF receiver IC into similar applications.  After many many years the purchaser wanted more parts as their end of life buy stock was depleted but our silicon fab supplier was no longer in business.  RF receivers are notoriously difficult to clone and get the exact same analog RF performance.  In the end we could offer no solution that prevented a system redesign and the purchaser was not happy at all.  Message here is that sometimes a system redesign is unavoidable so purchsers beware of their end of life plans.

  4. SunitaT
    June 11, 2011

    The ideal SLiM supplier will anticipate the needs of military programs and undertake redesign in advance of the exhaustion of existing material.


     Thanks for the post. Thanks highlighting the ideal SLiM suppliers role and responsibilities. But in reality do these SLiM suppliers ful-fill their responsibilities ?

  5. _hm
    August 14, 2011

    I worked for Ensil Technical Sales and Services, We have reversed engineered nearly 2000 NSN for US DoD. We also get many repeat order  for these devices and assemblies. We were unusually good at F3I replacement for assemblies and parts. IFf you need help for reverse engineering of parts, sub-assemblies, please contact them.

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