Aerosol Jet HD2 (AJ HD2) Product Introduction

General Introduction

The Aerosol Jet HD2 is a high-end, industrial-grade aerosol jet printing system introduced by Optomec, designed for demanding applications such as high-frequency RF devices, advanced semiconductor packaging, and high-density electronic interconnects. It serves as a specialized electronic manufacturing platform that delivers ultra-high precision, high throughput, and broad material compatibility. Building on Optomec’s proven aerosol jet technology, the HD2 has undergone a comprehensive upgrade, with key enhancements to print resolution, processing efficiency, and high-frequency signal transmission performance. It can fabricate fine electronic features with line widths as low as 10 μm and spacings as tight as 20 μm, while significantly increasing the printing speed of interconnect traces to meet the demands of industrial-scale mass production. The AJ HD2 employs a high-precision linear motor motion system and state-of-the-art vision-based alignment technology, achieving a positioning resolution of 0.1 μm. This enables non-contact processing within a single large-format work area, applying zero bonding force to individual chips and thereby providing effective protection for delicate semiconductor components. The system supports programmable sequence control software and an optional SMEMA-compatible in-line conveyor, allowing seamless integration into industrial production lines for automated, continuous manufacturing. It also complies with industry standards such as SEMI S2/S8, CE, and CSA, ensuring adherence to regulatory requirements for semiconductor and electronics manufacturing. Furthermore, the AJ HD2 exhibits exceptional material versatility, capable of processing conductive, dielectric, resistive, and other functional materials, while supporting up to 5 mm of lift-off printing—enabling high-precision deposition on non-planar and complex-shaped packaged devices and breaking through the limitations of conventional semiconductor packaging processes. Today, the AJ HD2 has become a core manufacturing tool in fields such as 5G communications, RF/microwave systems, and advanced semiconductor packaging, where it can replace traditional wire-bonding processes, substantially enhancing device high-frequency performance and integration density. As such, it provides critical technological support for the development of next-generation miniaturized, high-frequency electronic devices.

Working Principle

The Aerosol Jet HD2 is built on an optimized aerosol jet printing (AJP) technology, with a core workflow that comprises atomization, droplet sorting, aerodynamic focusing, high-speed deposition, and process control. While retaining the inherent advantages of conventional AJP, it features significant upgrades in atomization efficiency, focusing accuracy, and motion control, thereby achieving a dual enhancement in both high precision and high throughput. First, the system atomizes nano-particle–based liquid inks using a dual-mode approach—ultrasonic atomization combined with pneumatic atomization—allowing users to select the most suitable mode based on material properties. This results in the formation of uniform aerosol droplets with diameters ranging from 1 to 5 micrometers. Compared with traditional models, the HD2 delivers higher atomization efficiency and superior droplet uniformity, laying a solid foundation for high-precision printing. Next, the atomized aerosol enters the droplet-sorting and densification stage, where oversized or undersized droplets are precisely removed, leaving only those with uniform particle sizes. This step enhances the compactness of the aerosol, ensuring uniformity and consistency in the printed conductive traces and reducing printing defects. Subsequently, the system employs ultra-pure nitrogen as both a protective and focusing gas, generating a powerful aerodynamic focusing flow within the print head that compresses the aerosol droplet stream into a narrower, high-speed jet. The jet velocity can reach up to 100 m/s, while maintaining stable focus even at standoff distances of up to 5 mm. This capability enables conformal deposition on non-planar and complex-shaped semiconductor packaging components without any contact force exerted on the substrate, thereby effectively protecting delicate chips and packaged devices. Following this, the system’s high-precision linear motor motion platform drives the print head in high-speed, highly accurate movements with a positioning resolution of 0.1 μm. Based on pre-defined CAD paths, the aerosol jet is precisely deposited at rates ranging from 3 to 48 points per second at the target locations, enabling rapid printing of high-density, high-resolution electronic interconnects. Compared with the AJ 5X, the HD2 boasts a substantially increased printing throughput, fully meeting the demands of industrial-scale mass production. Finally, the system incorporates a digital recipe control system that provides real-time monitoring and precise regulation of the entire printing process, covering parameters such as atomization settings, gas flow rates, printing speed, and substrate temperature. It is also equipped with a high-precision vision alignment system that enables real-time calibration during printing, ensuring both printing accuracy and batch-to-batch consistency. Additionally, the HD2 supports optional laser and UV curing options, allowing in-situ post-processing tailored to material properties, further enhancing processing efficiency and product performance.

Advantages and Key Features

The Aerosol Jet HD2’s core advantages lie in four key areas: ultra-high printing precision, high industrial throughput, outstanding high-frequency performance, and strong industrial compatibility. At the same time, it upholds Optomec’s traditional strengths in material compatibility, process flexibility, and process stability, making it an industrial-grade platform for high-end electronics manufacturing. In terms of printing precision and fine feature resolution, the system achieves a minimum line width of 10 μm and a minimum line spacing of 20 μm, with motion resolution down to 0.1 μm and exceptional positional repeatability. Coupled with a high-precision vision alignment system, it enables micron-level precise deposition, meeting the demanding requirements of advanced semiconductor packaging and high-frequency RF devices for ultra-fine electronic structures. Its printing accuracy far surpasses that of conventional wire bonding and screen-printing processes, enabling significantly higher device integration densities. Regarding industrial throughput and production efficiency, the equipment dramatically increases interconnect-line printing speed, delivering high-speed output from 3 to 48 dots per second—particularly advantageous for interconnect printing on stacked chips. It also supports programmable sequencing software and optional SMEMA-compatible in-line conveyor systems, allowing seamless integration into industrial automation lines for continuous, batch production. Compared with research-oriented systems, its production efficiency is markedly improved, fully satisfying the needs of industrial-scale manufacturing. In terms of high-frequency signal transmission performance, the 3D interconnect traces printed by this system can replace traditional wire-bonding processes, substantially reducing trace inductance and delivering superior performance at frequencies above 40 GHz. This addresses the issues of signal loss and interference that plague conventional methods at high frequencies, providing critical technological support for the manufacture of 5G communications, RF/microwave, and millimeter-wave devices. On the front of industrial compatibility and standardization, the system complies with SEMI S2/S8, CE, CSA, and other industry standards for semiconductor and electronics manufacturing, ensuring adherence to high-end manufacturing specifications. Its design also aligns with the layout requirements of industrial production lines; the optional in-line conveyor enables automated substrate loading and unloading, further enhancing line automation. In terms of processing flexibility and substrate adaptability, the system supports an off-surface printing distance of up to 5 mm, allowing conformal deposition on non-planar, complex-shaped, and 3D-packaged components without any contact force exerted on the substrate, thereby effectively protecting delicate chips and devices. It is compatible with a wide range of materials, including conductive (silver, copper, gold), dielectric (polyimide, UV-curable acrylates), resistive, and photoresist materials, enabling the fabrication of 3D interconnects, redistribution layers (RDL), package-level shielding layers, and other complex electronic structures to meet diverse process requirements in advanced semiconductor packaging. With respect to process stability and controllability, the system is equipped with a digital recipe control system that allows precise adjustment and storage of all printing parameters, facilitating standardized process management and ensuring batch-to-batch consistency. It also features real-time process monitoring and automatic alarm systems, which promptly detect anomalies during printing, reduce defect rates, and enhance production stability. Furthermore, the system adopts a single large-format work area design, eliminating the need for frequent substrate changes and boosting processing efficiency. It also supports offline CAD/CAM programming, enabling rapid conversion of semiconductor packaging designs into print paths and shortening the R&D-to-production cycle. Compared with traditional semiconductor packaging processes, the AJ HD2 eliminates the need for dedicated molds and fixtures, enabling mold-free fabrication and substantially reducing production costs for small-batch, customized high-end devices while increasing design flexibility.

The Aerosol Jet HD2 model boasts exceptional material compatibility and a highly open materials platform, making it ideally suited to accommodate a wide range of functional materials required throughout the entire R&D process for electronic devices. These include conductive nanoparticle inks (such as gold, silver, carbon nanotubes, and MXenes), various high-performance polymers (including thermosetting polymers, UV-curable photopolymers, and solvent-based polyimides), insulating materials, high-performance adhesives, etchants, and even biomaterials like proteins and DNA. The system supports open-source material access, allowing users to either directly select from established commercial ink formulations or independently develop custom functional materials, thereby flexibly meeting diverse research and industrialization needs. The figure below illustrates material systems that have been validated through peer-reviewed publications and practical testing, with additional new materials continuously under development.

Application Areas and Use Cases

The Aerosol Jet HD2 is primarily targeted at high-end application areas such as advanced semiconductor packaging, 5G/6G communications, RF and microwave devices, high-end aerospace electronics, and automotive radar. Its core mission is to address the manufacturing needs of high-frequency, highly integrated, and miniaturized electronic components, making it a pivotal piece of equipment for next-generation high-end electronic device fabrication. In the field of advanced semiconductor packaging, this system can be used for processes such as 3D interconnects, redistribution layers (RDL), wafer-level packaging, and direct die-to-substrate printing, thereby replacing conventional wire bonding and flip-chip soldering. This enhances packaging density and signal transmission efficiency, making it suitable for advanced packaging architectures like heterogeneous integration and stacked-die DRAM, effectively reducing device footprint while increasing chip integration. In 5G/6G communications and RF/microwave applications, it enables the printing of high-frequency RF interconnects, microwave components, and millimeter-wave antennas; the printed traces exhibit low inductance and low loss, delivering outstanding performance in high-frequency signal transmission above 60 GHz. Consequently, it is ideal for manufacturing core components of 5G base stations, RF modules, and satellite communication equipment, boosting both performance and miniaturization. In the realm of high-end aerospace electronics, it can print conformal electronic circuits and interconnect structures on complex aerospace structural parts and precision components, achieving integrated co-design of electronics and structure, reducing device volume and weight, and enhancing equipment reliability and performance—making it well-suited for high-end systems such as satellites, UAVs, and aircraft engine monitoring devices. In the automotive radar sector, it supports the fabrication of core RF components for in-vehicle millimeter-wave radar, improving detection accuracy and signal transmission efficiency to meet the demands of intelligent connected vehicle production. In the area of electronic component shielding, conductive ink shielding layers can be directly printed onto packaged chips, enabling package-level electromagnetic shielding and enhancing the device’s immunity to interference—thus replacing traditional metal shielding enclosures and significantly reducing overall device size. As a typical application example, this equipment has been employed for 3D interconnect printing in stacked-die DRAM, substituting conventional wire bonding, reducing loop height in interconnects, and improving the utilization of active silicon area. Meanwhile, in wafer-level packaging, it has enabled direct printing of 3D interconnects and RDL on bare dies, driving the advancement of next-generation semiconductor packaging technologies. Furthermore, RF component manufacturers have utilized this system for producing high-frequency microwave interconnects, overcoming the performance limitations inherent in conventional processes at high frequencies.