In the back-end processes of semiconductor manufacturing, chip packaging equipment is the core carrier
determining the final performance, reliability, and yield of chips. Precision motion modules, acting as the
"skeleton and joints" of this high-end equipment, directly define the equipment's processing accuracy,
operational stability, and production efficiency, and are key foundational components supporting the imp
lementation of advanced packaging processes.
Multiple core workstations throughout the chip packaging process heavily rely on the precise coordination
of high-performance modules. In the die bonding process, the X-Y-Z multi-axis motion module of the die bo
nder needs to achieve nanometer-level positioning accuracy to precisely mount bare dies, only tens of mic
rometers thick, to designated positions on the substrate. Deviation control is typically within the micromete
r level to avoid damage to the fragile chip pins. These modules generally employ a combination of high-rigi
dity linear guides and high-precision ball screws. Some high-end models also use modular KK linear modul
es, which, with their low vibration and high response speed characteristics, maintain the stability of the op
tical path and nozzle position even during high-speed reciprocating motion, significantly improving die bo
nding yield.
In the wire bonding and flip-chip bonding processes, the dynamic performance of the module directly deter
mines the interconnect quality. The high-speed motion module on the bonding head needs to complete the
entire process of pressing, soldering, and lifting within milliseconds, while ensuring that the alignment error
of the bonding wire or copper pillar does not exceed 1 micrometer, in order to achieve a reliable connection
between the chip pins and the substrate circuitry. These modules typically feature a lightweight design to re
duce motion inertia, and are equipped with high-precision optical encoders to achieve fully closed-loop con
trol. Even during long-term continuous operation, they can avoid position drift and meet the needs of tens
of thousands of bonding operations per day.
As advanced packaging technologies evolve towards 2.5D and 3D stacking, the performance requirements
for chip packaging equipment modules have also increased to new heights. In processes such as wafer-level
packaging and silicon interposer mounting, equipment needs to precisely stack dozens of chips within a sp
ace the size of a fingernail. This requires the module to not only possess ultra-high planar positioning accura
cy but also excellent Z-axis motion parallelism to avoid chip tilting and uneven force distribution during sta
cking. Some high-end modules equipped with embedded microfluidic heat dissipation structures can simul
taneously dissipate heat generated during equipment operation, further suppressing thermal deformation
and keeping accuracy fluctuations within a minimal range even in 24-hour continuous production scenarios.
Beyond core motion control capabilities, modules adapted to chip packaging scenarios must also consider
cleanliness, environmental adaptability, and maintainability. Semiconductor packaging workshops are high
-level clean environments, so the module design minimizes exposed dust-prone structures and uses low-vo
latile, wear-resistant special lubricating materials to prevent particulate contamination of wafers during op
eration. To address temperature and humidity fluctuations in packaging workshops, the modules undergo
pre-optimization for thermal expansion coefficient matching, reducing the impact of ambient temperature
changes on accuracy. The modular design also makes the replacement and maintenance of these compone
nts more convenient, allowing for rapid restoration to production status without complex overall equipment
adjustments, significantly reducing production line downtime.
From traditional QFN and BGA packaging to today's cutting-edge technologies such as multi-chip modules
(MCM) and co-packaged optics (CPO), each process iteration of chip packaging equipment is inseparable fr
om the synchronous upgrade of motion module performance. As the core transmission and positioning com
ponents of the equipment, the precision, stability and service life of the module have long been one of the
core indicators for measuring the technical level of chip packaging equipment, and also an important corn
erstone for supporting the development of the entire semiconductor packaging and testing industry towards
higher density and higher efficiency.
