The Heat Problem Is Scaling Faster Than Ever
Every generation of connectivity gets hotter. A 5G AAU (active antenna unit) consumes three to four times the power of its 4G equivalent, and AI servers now push 1-2 kW of heat per rack. Cooling is no longer an afterthought – it decides system reliability, lifespan and energy cost.
Where Extruded Aluminium Does the Work
The big consumers of heat sink profiles today: 5G AAU and small-cell heatsinks (large surface area in a compact outdoor box), data center server CPU/GPU heatsinks, cold plates for liquid cooling loops, and high-power optical modules. Most are extruded 6063-T5, often black anodised to add radiation.
Extrusion Beats Stamped and Die-Cast
For fins over 20 mm tall, stamping is out of the question and die-casting adds porosity and tooling cost. Extrusion delivers tall, thin fins in one pass with tight tolerances – and cold plates start as extruded slabs before CNC machining. That is why the industry standard is still the extruded profile.
A Quiet Growth Curve for Suppliers
Telecom and data center hardware runs on multi-year product cycles with big batch sizes and strict consistency requirements. For buyers, a supplier with dedicated extrusion capacity and anodising in-house shortens lead times and protects quality. That is exactly the setup we run at Siken Aluminum – send us your thermal design and we will quote the extrusion.
Frequently Asked Questions
Why are 5G and data centers driving aluminium heat sink demand?
5G base stations and high-density server racks push power densities well beyond what stamped steel or simple cast parts can cool. Extruded aluminium heat sinks provide the fin area and thermal path needed in compact enclosures, at a cost and weight that scale with the market.
What profile geometries suit base station and server cooling?
Tall, dense fins with forced airflow are common in active cooling, while passive outdoor units prefer wider fin spacing that sheds heat by natural convection. Cold-plate extrusions serve liquid-cooled racks. All of these are achievable with custom dies.
How quickly can Siken Aluminum ramp up for telecom or data-center programs?
After drawing approval, custom dies typically take 7-15 days, with production samples in the following 1-2 weeks. For volume programs we coordinate capacity and finishing (anodizing, machining) to keep the supply chain on schedule.