As a developer of innovative materials solutions for critical radio frequency (RF)/microwave applications, Indium Corporation will highlight its high-reliability, gold-based precision die-attach preforms at the International Microwave Symposium (IMS), June 7 to June 12, in Boston, Massachusetts.
Among its featured products, Indium Corporation will showcase: 
Source: Indium Corporation
- AuLTRA 75 is an off-eutectic gold-tin (AuSn) preform solution (75Au/25Sn) designed to improve intermetallic reliability in applications using a die with a thick gold plating, such as a gallium nitride (GaN) die used for high-frequency, high-power RF power amplifier devices for 5G and other critical military and aerospace wireless communications. AuLTRA 75 helps improve the operation of these critical technologies by adjusting the final solder joint composition and improving wetting and voiding. The AuLTRA product line also comes in 78Au/22Sn and 79Au/21Sn compositions.
- AuLTRA DA0001 offers the new gold standard — the highest level of quality available to deliver the best performance possible in critical, high-reliability die-attach applications. Features include:
- Highly accurate thickness control
- Precise edge quality
- Optimized cleanliness
- Default waffle pack method
- Available for gold-based alloys
Additionally, Indium Corporation will feature the following gold-based die-attach solutions:
- AuLTRA ThInFORMS are 0.00035-inch-thick (0.00889 mm or 8.89 μm) 80Au/20Sn preforms that improve the overall operational efficiency of high-output lasers. AuLTRA ThInFORMS help combat common issues such as shorting and poor thermal transfer.
- AuLTRA Fine Ribbon is the company’s Indalloy182 fine-grade precision ribbon for high-volume, fully automated laser diode assembly processes. For these auto-feed systems, the precision and high quality of the ribbon and spooling are of the utmost importance, along with long continuous lengths. These features help minimize production downtime and facilitate an efficient, high-throughput process, resulting in a high-quality end product and a lower cost of ownership.
- AuLTRA 3.2 is an air or nitrogen reflow, water-soluble AuSn solder paste, optimized to handle the elevated processing temperatures of gold-based alloys. Perfect for high-power LED module array assemblies, it ensures consistent and repeatable printing performance, featuring a long stencil life and excellent tack. Along with consistently meeting printing and reflow demands, AuLTRA 3.2 delivers superb wetting and low voiding.
- AuLTRA 5.1 is a no-clean AuSn solder paste, specifically formulated to endure the higher temperatures required by Au-based alloys. Ideal for high-power LED module array assemblies, this formulation provides a broad processing window and consistent print definition, even for ultra-fine pitches. Additionally, AuLTRA 5.1 excels in wetting performance and void minimization, while meeting rigorous printing and reflow standards.
Learn more about Indium Corporation’s precision Au-based preforms and meet the company experts at IMS 2026, booth 21054.
