Aerosol Jet HD2 (AJ HD2) Product Overview

General Introduction

The Aerosol Jet HD2 is a high-end, industrial‑grade aerosol jet printing system launched by Optomec. It is designed for advanced applications such as high‑frequency RF devices, cutting‑edge semiconductor packaging, and high‑density electronic interconnects, serving as a specialized platform that balances exceptional precision, high throughput, and broad material compatibility. Building on Optomec’s proven aerosol jet technology, this system has been upgraded to deliver enhanced print accuracy, improved processing efficiency, and superior high‑frequency signal transmission performance. It can fabricate fine electronic structures with line widths as narrow as 10 µm and spacings down to 20 µm, while significantly accelerating the deposition 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. It enables non‑contact processing within a single large work area, applying zero bonding force to individual chips and thereby safeguarding delicate semiconductor components. The system supports programmable sequencing software and optional SMEMA‑compliant in‑line conveyor integration, allowing seamless incorporation 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 in semiconductor and electronics manufacturing. Furthermore, the AJ HD2 boasts outstanding material versatility, capable of processing conductive, dielectric, resistive, and other functional materials. It supports an impressive off‑substrate printing height of up to 5 mm, enabling high‑precision deposition on non‑planar or complex‑shaped packages and opening new possibilities for advancing conventional semiconductor packaging technologies. Today, the AJ HD2 has become a critical manufacturing tool across fields including 5G communications, RF microwave systems, and advanced semiconductor packaging. It can replace traditional wire‑bonding processes, substantially enhancing device performance at high frequencies and increasing integration density, thus providing essential 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. Its primary workflow comprises atomization, droplet sorting, aerodynamic focusing, high‑speed deposition, and process control. While retaining the proven advantages of conventional AJP, it features enhanced atomization efficiency, improved focusing precision, and refined motion control, delivering a dual boost in both high precision and high throughput. First, the system atomizes nano‑particle‑based liquid inks using a dual‑mode approach—ultrasonic and pneumatic atomization—allowing users to select the most suitable method based on material properties. This produces uniform aerosol droplets with diameters ranging from 1 to 5 microns. Compared with earlier models, this design offers higher atomization efficiency and superior droplet uniformity, laying a solid foundation for high‑precision printing. Next, the atomized aerosol proceeds to droplet sorting and densification. In this stage, excessively large or small droplets are precisely removed, leaving only those with consistent particle sizes. This step enhances the aerosol’s density, ensuring uniformity and consistency in printed traces while minimizing defects. Subsequently, the system employs ultra‑pure nitrogen as both a protective and focusing gas, generating a powerful aerodynamic focusing stream within the print head. This compresses the aerosol droplet beam into an extremely fine, high‑velocity jet capable of reaching speeds up to 100 m/s, maintaining stable focus even at standoff distances of up to 5 mm. This capability enables conformal deposition on non‑planar, complex‑shaped semiconductor packages without exerting any contact force on the substrate, thereby protecting delicate chips and encapsulated components. Following this, the device’s high‑precision linear motor–driven print head executes rapid, highly accurate movements with a positioning resolution of 0.1 μm. Based on pre‑programmed CAD paths, the aerosol jet can be precisely deposited at rates ranging from 3 to 48 points per second, enabling the rapid fabrication of densely packed, finely detailed electronic interconnects. Compared with the AJ 5X, its throughput has been significantly increased, meeting the demands of industrial‑scale mass production. Finally, the system utilizes a digital recipe‑control platform to monitor and fine‑tune the entire printing process in real time, adjusting parameters such as atomization settings, gas flow rates, printing speed, and substrate temperature. It also incorporates a high‑precision vision‑alignment system for on‑the‑fly calibration, ensuring both printing accuracy and batch‑to‑batch consistency. Optional laser and UV curing options further enhance processing efficiency and product performance by enabling in‑situ post‑processing tailored to specific material characteristics.

Advantages and Key Features

The Aerosol Jet HD2’s key advantages lie in four major areas: high printing accuracy, high industrial throughput, superior high‑frequency performance, and strong industrial compatibility. At the same time, it upholds Optomec’s AJP technology’s traditional strengths in material versatility, processing flexibility, and process stability, making it an industrial‑grade platform tailored for advanced 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 pitch of 20 µm, with motion resolution down to 0.1 µm and excellent 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 surpasses that of conventional wire bonding and screen‑printing processes, allowing for significantly higher device integration densities. Regarding industrial throughput and production efficiency, the equipment boosts interconnect‑line printing speeds, delivering rapid deposition rates of 3 to 48 points per second—particularly advantageous for stacking‑chip interconnects. It also supports programmable sequencing software and optional SMEMA‑compliant in‑line conveyors, enabling seamless integration into automated production lines for continuous, batch‑oriented manufacturing. Compared with research‑oriented systems, its productivity gains are substantial, fully satisfying industrial‑scale manufacturing needs. In high‑frequency signal transmission, the 3D interconnects printed by this system can replace traditional wire‑bonding techniques, effectively reducing trace inductance and delivering outstanding performance at frequencies above 40 GHz. This addresses the signal loss and interference issues inherent in conventional methods at high frequencies, providing robust technical support for the fabrication 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 semiconductors and electronics manufacturing, ensuring adherence to high‑end regulatory requirements. Its design aligns with typical industrial production‑line layouts, and the optional in‑line conveyor facilitates automated substrate loading and unloading, further enhancing line automation. In terms of processing flexibility and substrate adaptability, the system accommodates up to 5 mm of standoff height, enabling conformal deposition on non‑planar, complex‑shaped, and 3D‑packaged components without applying any contact force to the substrate, thereby 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—allowing the fabrication of diverse electronic structures such as 3D interconnects, redistribution layers (RDLs), and package‑level shielding layers, thus supporting the varied process requirements of advanced semiconductor packaging. For process stability and controllability, the system features a digital recipe‑control system that enables precise adjustment and storage of all printing parameters, facilitating standardized process management and ensuring consistent batch‑to‑batch quality. Additionally, it includes real‑time process monitoring and automatic alarm functions, promptly detecting anomalies during printing, reducing defect rates, and enhancing overall production reliability. Furthermore, the machine adopts a single large‑area work envelope, eliminating the need for frequent substrate changes and boosting processing efficiency. It also supports offline CAD/CAM programming, enabling rapid translation of semiconductor package designs into printable paths, thereby shortening product development and mass‑production cycles. Compared with traditional semiconductor packaging methods, the AJ HD2 eliminates the need for dedicated molds and fixtures, enabling mold‑free fabrication and lowering production costs for small‑volume, custom‑made high‑end devices while increasing design flexibility.

The Aerosol Jet HD2 model boasts excellent material compatibility and a highly open materials platform, enabling seamless integration with a wide array of functional materials required throughout the entire electronic device development process. These include conductive nanoparticle inks—such as gold, silver, carbon nanotubes, and MXenes—various high-performance polymers—including thermosetting resins, UV‑curable photopolymers, and solvent‑based polyimides—insulating materials, advanced adhesives, etchants, and even biomaterials like proteins and DNA. The system supports open‑source material usage, allowing users to either directly employ commercially available inks or independently develop custom‑designed 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 currently under ongoing 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. It effectively addresses the manufacturing needs of high‑frequency, highly integrated, and miniaturized electronic components, making it a key piece of equipment for next‑generation high‑end electronic device production. In the field of advanced semiconductor packaging, this system can be used for processes including 3D interconnects, redistribution layers (RDL), wafer‑level packaging, and direct die‑to‑substrate printing, replacing conventional wire bonding and flip‑chip soldering. It enhances packaging density and signal‑transmission efficiency, supporting advanced packaging architectures such as heterogeneous integration and stacked‑die DRAM, thereby significantly reducing device footprint and increasing chip integration. In 5G/6G communications and RF/microwave applications, it enables the printing of high‑frequency RF interconnects, microwave components, millimeter‑wave antennas, and more. The printed traces exhibit low inductance and low loss, delivering superior performance in high‑frequency signal transmission above 60 GHz. This makes it suitable for fabricating components for 5G base stations, RF modules, and satellite communication systems, improving both performance and miniaturization. In the realm of high‑end aerospace electronics, the system can print conformal electronic circuits and interconnect structures on complex aerospace geometries and precision components, achieving integrated design that reduces component volume and weight while enhancing reliability and performance. It is well suited for cutting‑edge platforms such as satellites, unmanned aerial vehicles, and aircraft engine monitoring systems. In the automotive radar sector, it supports the fabrication of core RF components for vehicle‑mounted millimeter‑wave radars, boosting detection accuracy and signal‑transmission efficiency to meet the demands of intelligent connected vehicles. In the area of electronic component shielding, the system can directly print conductive‑ink shielding layers onto packaged chips, enabling package‑level electromagnetic shielding and improving immunity to interference—replacing traditional metal shielding enclosures and substantially reducing device size. As a typical example, the equipment has been employed to print 3D interconnects for stacked‑die DRAM, substituting for conventional pin‑bonding and lowering trace loop height while increasing 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 advances in next‑generation semiconductor packaging technologies. Furthermore, RF component manufacturers have utilized this system to produce high‑frequency microwave interconnects, overcoming the performance limitations of conventional processes at elevated frequencies.