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Development and Validation of Tin-Whisker Growth Model and Accelerated Testing

Award Information

Department of Defense
Office of the Secretary of Defense
Award ID:
Program Year/Program:
2009 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Texas Research Institute Austin, Inc.
9063 Bee Caves Road Austin, TX 78733-
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2009
Title: Development and Validation of Tin-Whisker Growth Model and Accelerated Testing
Agency / Branch: DOD / OSD
Contract: W31P4Q-09-C-0645
Award Amount: $100,000.00


Reliabilities of lead-free soldered assemblies and surface finishes are different from heritage tin-lead eutectic alloys when used in high-performance or long-lived military and aerospace applications. Single crystal, beta-tin whiskers have erupted spontaneously from surfaces of lead-free soldered and tin-plated circuits, causing electrical short circuits and component failures. The proposed work will involve systematic investigations of whisker growth in electronic materials to identify initiating and propagating mechanisms, quantitatively linked to physical stress state, temperature and crystallographic and impurity factors. The work will result in determinations of the effects of each of these factors, and development of a unifying growth model to account for them. The model will be validated against tin and other metals used in electronics that are prone to sprout electrically conductive single crystals. Using this model, TRI will develop a protocol to accelerate representative conditions that excite whisker growth mechanisms. A global solution to whisker growth in electronics will be forthcoming upon availability of this demonstrated growth model. TRI will rely on its metallurgical and materials experience to identify the most robust and least expensive solutions possible. We will develop and qualify an inexpensive tin whisker mitigation technique capable of rapid application using standard manufacturing practices.

Principal Investigator:

George Hansen
Principal Investigator

Business Contact:

Monte Fellingham
Contracts Administrator
Small Business Information at Submission:

9063 Bee Caves Road Austin, TX 78733

EIN/Tax ID: 742518103
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No