Cold-forged elliptical-pin heat sinks are the ideal choice when there is sufficient airflow (greater than 200 LFM or 1.0 m/sec), and both low thermal resistance and low pressure drop are required. The heat sinks can be forged from pure aluminum 1060/1070, which has high thermal conductivity (~240 W/m-K), or other aluminum and copper alloys, such as 6063-T5 and C11000.
- Elliptical pin heat sinks offer low thermal resistance and low pressure drop (as compared to extruded heat sinks).
- The low-pressure drop improves heat transfer in the entire system, especially the region behind the heat sink.
- The cold-forging process employs high pressure and low temperature. The high pressure ensures that no air bubbles, porosity, or other impurities are trapped in the material and thus produces heat sinks with extremely high quality.
- Our pin fin heat sinks are cold-forged from pure aluminum 1070, which has much higher thermal conductivity than aluminum alloys like 6063 and 6061.
S803 Series – Elliptical-Pin Heat Sinks
| Part Number | Width (mm) | Length (mm) | Height (mm) | Weight (g) | RSA (°C/W) Natural Convection | RSA (°C/W) 1.0 m/sec (200 LFM) | RSA (°C/W) 2.0 m/sec (400 LFM) | RSA (°C/W) 3.0 m/sec (600 LFM) | Request Quote | Request Sample |
|---|---|---|---|---|---|---|---|---|---|---|
| S803-1900-095 | 19 | 19 | 9.5 | 3.2 | 30.4 | 10.4 | 7.63 | 5.97 | Quote | Sample |
| S803-1900-145 | 19 | 19 | 14.5 | 5 | 21 | 7.32 | 5.38 | 4.16 | Quote | Sample |
| S803-1900-245 | 19 | 19 | 24.5 | 7.1 | 12.9 | 4.56 | 3.46 | 2.74 | Quote | Sample |
| S803-1900-279 | 19 | 19 | 27.9 | 7.8 | 11.6 | 4.11 | 3.15 | 2.52 | Quote | Sample |
| S803-2700-095 | 27 | 27 | 9.5 | 6.4 | 18.5 | 6.2 | 4.34 | 3.32 | Quote | Sample |
| S803-2700-145 | 27 | 27 | 14.5 | 10 | 12.5 | 4.27 | 3.03 | 2.3 | Quote | Sample |
| S803-2700-245 | 27 | 27 | 24.5 | 14.3 | 7.62 | 2.62 | 1.92 | 1.49 | Quote | Sample |
| S803-2700-279 | 27 | 27 | 27.9 | 15.7 | 6.83 | 2.35 | 1.74 | 1.36 | Quote | Sample |
| S803-3500-095 | 35 | 35 | 9.5 | 11.2 | 12 | 3.92 | 2.64 | 2.01 | Quote | Sample |
| S803-3500-145 | 35 | 35 | 14.5 | 17.6 | 7.93 | 2.62 | 1.78 | 1.35 | Quote | Sample |
| S803-3500-245 | 35 | 35 | 24.5 | 25.5 | 4.8 | 1.6 | 1.11 | 0.87 | Quote | Sample |
| S803-3500-279 | 35 | 35 | 27.9 | 28.1 | 4.3 | 1.44 | 1.01 | 0.79 | Quote | Sample |
| S803-4500-095 | 45 | 45 | 9.5 | 18.1 | 8.69 | 2.81 | 1.84 | 1.39 | Quote | Sample |
| S803-4500-145 | 45 | 45 | 14.5 | 28.6 | 5.77 | 1.88 | 1.25 | 0.94 | Quote | Sample |
| S803-4500-245 | 45 | 45 | 24.5 | 41 | 3.49 | 1.14 | 0.78 | 0.6 | Quote | Sample |
| S803-4500-279 | 45 | 45 | 27.9 | 45.2 | 3.13 | 1.03 | 0.7 | 0.55 | Quote | Sample |
| S803-6000-095 | 60 | 60 | 9.5 | 29.9 | 6.42 | 2.05 | 1.3 | 0.98 | Quote | Sample |
| S803-6000-145 | 60 | 60 | 14.5 | 47.3 | 4.26 | 1.37 | 0.88 | 0.66 | Quote | Sample |
| S803-6000-245 | 60 | 60 | 24.5 | 66.5 | 2.57 | 0.83 | 0.55 | 0.42 | Quote | Sample |
| S803-6000-279 | 60 | 60 | 27.9 | 73 | 2.3 | 0.74 | 0.49 | 0.38 | Quote | Sample |
Notes: RSA refers to the thermal resistance from the heat sink to ambient air; Thermal resistance data are for reference only.
S804 Series – Elliptical-Pin Heat Sinks with Push Pins
| Part Number | Width (mm) | Length (mm) | Height (mm) | Hole-Hole Distance (mm) | RSA (°C/W) Natural Convection | RSA (°C/W) 1.0 m/sec (200 LFM) | RSA (°C/W) 2.0 m/sec (400 LFM) | RSA (°C/W) 3.0 m/sec (600 LFM) | Request Quote | Request Sample |
|---|---|---|---|---|---|---|---|---|---|---|
| S804-190L-095 | 19 | 19 | 9.5 | 24.0×24.0 | 30.4 | 10.4 | 7.63 | 5.97 | Quote | Sample |
| S804-190L-145 | 19 | 19 | 14.5 | 24.0×24.0 | 21 | 7.32 | 5.38 | 4.16 | Quote | Sample |
| S804-190L-245 | 19 | 19 | 24.5 | 24.0×24.0 | 12.9 | 4.56 | 3.46 | 2.74 | Quote | Sample |
| S804-190L-279 | 19 | 19 | 27.9 | 24.0×24.0 | 11.6 | 4.11 | 3.15 | 2.52 | Quote | Sample |
| S804-190R-095 | 19 | 19 | 9.5 | 24.0×24.0 | 30.4 | 10.4 | 7.63 | 5.97 | Quote | Sample |
| S804-190R-145 | 19 | 19 | 14.5 | 24.0×24.0 | 21 | 7.32 | 5.38 | 4.16 | Quote | Sample |
| S804-190R-245 | 19 | 19 | 24.5 | 24.0×24.0 | 12.9 | 4.56 | 3.46 | 2.74 | Quote | Sample |
| S804-190R-279 | 19 | 19 | 27.9 | 24.0×24.0 | 11.6 | 4.11 | 3.15 | 2.52 | Quote | Sample |
| S804-270L-095 | 27 | 27 | 9.5 | 32.0×32.0 | 18.5 | 6.2 | 4.34 | 3.32 | Quote | Sample |
| S804-270L-145 | 27 | 27 | 14.5 | 32.0×32.0 | 12.5 | 4.27 | 3.03 | 2.3 | Quote | Sample |
| S804-270L-245 | 27 | 27 | 24.5 | 32.0×32.0 | 7.62 | 2.62 | 1.92 | 1.49 | Quote | Sample |
| S804-270L-279 | 27 | 27 | 27.9 | 32.0×32.0 | 6.83 | 2.35 | 1.74 | 1.36 | Quote | Sample |
| S804-270R-095 | 27 | 27 | 9.5 | 32.0×32.0 | 18.5 | 6.2 | 4.34 | 3.32 | Quote | Sample |
| S804-270R-145 | 27 | 27 | 14.5 | 32.0×32.0 | 12.5 | 4.27 | 3.03 | 2.3 | Quote | Sample |
| S804-270R-245 | 27 | 27 | 24.5 | 32.0×32.0 | 7.62 | 2.62 | 1.92 | 1.49 | Quote | Sample |
| S804-270R-279 | 27 | 27 | 27.9 | 32.0×32.0 | 6.83 | 2.35 | 1.74 | 1.36 | Quote | Sample |
| S804-375L-095 | 37.5 | 37.5 | 9.5 | 41.7×41.7 | 11.9 | 3.9 | 2.64 | 2.01 | Quote | Sample |
| S804-375L-145 | 37.5 | 37.5 | 14.5 | 41.7×41.7 | 7.98 | 2.65 | 1.82 | 1.37 | Quote | Sample |
| S804-375L-245 | 37.5 | 37.5 | 24.5 | 41.7×41.7 | 4.83 | 1.61 | 1.14 | 0.88 | Quote | Sample |
| S804-375L-279 | 37.5 | 37.5 | 27.9 | 41.7×41.7 | 4.32 | 1.45 | 1.03 | 0.81 | Quote | Sample |
| S804-375R-095 | 37.5 | 37.5 | 9.5 | 41.7×41.7 | 11.9 | 3.9 | 2.64 | 2.01 | Quote | Sample |
| S804-375R-145 | 37.5 | 37.5 | 14.5 | 41.7×41.7 | 7.98 | 2.65 | 1.82 | 1.37 | Quote | Sample |
| S804-375R-245 | 37.5 | 37.5 | 24.5 | 41.7×41.7 | 4.83 | 1.61 | 1.14 | 0.88 | Quote | Sample |
| S804-375R-279 | 37.5 | 37.5 | 27.9 | 41.7×41.7 | 4.32 | 1.45 | 1.03 | 0.81 | Quote | Sample |
| S804-450L-095 | 45 | 45 | 9.5 | 38.0×38.0 | 9.09 | 2.96 | 1.99 | 1.51 | Quote | Sample |
| S804-450L-145 | 45 | 45 | 14.5 | 38.0×38.0 | 6.03 | 1.98 | 1.35 | 1.03 | Quote | Sample |
| S804-450L-245 | 45 | 45 | 24.5 | 38.0×38.0 | 3.68 | 1.22 | 0.86 | 0.67 | Quote | Sample |
| S804-450L-279 | 45 | 45 | 27.9 | 38.0×38.0 | 3.3 | 1.1 | 0.78 | 0.61 | Quote | Sample |
| S804-450R-095 | 45 | 45 | 9.5 | 38.0×38.0 | 9.09 | 2.96 | 1.99 | 1.51 | Quote | Sample |
| S804-450R-145 | 45 | 45 | 14.5 | 38.0×38.0 | 6.03 | 1.98 | 1.35 | 1.03 | Quote | Sample |
| S804-450R-245 | 45 | 45 | 24.5 | 38.0×38.0 | 3.68 | 1.22 | 0.86 | 0.67 | Quote | Sample |
| S804-450R-279 | 45 | 45 | 27.9 | 38.0×38.0 | 3.3 | 1.1 | 0.78 | 0.61 | Quote | Sample |
| S804-6000-095 | 60 | 60 | 9.5 | 50.0×50.0 | 5.81 | 1.83 | 1.19 | 0.96 | Quote | Sample |
| S804-6000-145 | 60 | 60 | 14.5 | 50.0×50.0 | 4.13 | 1.3 | 0.84 | 0.68 | Quote | Sample |
| S804-6000-245 | 60 | 60 | 24.5 | 50.0×50.0 | 2.56 | 0.81 | 0.54 | 0.44 | Quote | Sample |
| S804-6000-279 | 60 | 60 | 27.9 | 50.0×50.0 | 2.29 | 0.73 | 0.49 | 0.4 | Quote | Sample |
Notes: RSA refers to the thermal resistance from the heat sink to ambient air; Thermal resistance data are for reference only.
How Are Elliptical-Pin Heat Sinks Manufactured?
Using cold forging. Please follow this link to learn more about the features of cold forging and see examples of cold-forged heat sinks.
How Do We Test Heat Sinks?
At MyHeatSinks, we have a thermal laboratory where we can analyze heat sinks and measure the thermal resistance of heat sinks, heat pipes, CPU coolers, and other thermal modules with single or multiple heat sources. Our thermal test platform is connected to a wind tunnel, which allows users to set up the airflow rate and heating power to simulate the working environment of the heat sink. For more information about our thermal analysis of heat sinks, check out our Laboratory Services page, where we offer thermal analysis of heat sinks with single or multiple heat sources and forced convection.
Other Benefits of Cold-Forged Elliptical-Pin Heat Sinks
In cold forging, the pins are an integral part of the heatsink base – they are simply squeezed out of the base by high pressure. Unlike bonded fin heat sinks, there is no thermal resistance between the pins and the base in precision-forged heatsinks.
In addition to aluminum heatsinks, we also offer round pin heatsinks made of pure copper (C11000). Copper heatsinks typically improve thermal performance by 10-20%. They are recommended for critical applications where a few degrees of temperature reduction can make a big difference.
How to Choose the Right Push Pins
Spring-loaded push pins are an easy-to-use and highly effective method to secure heatsinks for heat-generating components and PCBs. They provide precise and uniform pressure between the heatsinks and components and optimize the performance of thermal interface materials. Push pins can be made of nylon, brass, or steel.
Nylon push pins are cost-effective and perform well when the ambient temperature is relatively low. However, the glass transition temperature (Tg) of nylon 6/6 (PA66), the most popular material used in making push pins, is only 45-50°C. Above its Tg, the material will change from its glassy state to a rubbery state and become soft and flexible. For this reason, we recommend nylon push pins for low-temperature and cost-sensitive applications or when electrical insulation is required.
Brass push pins, on the other hand, can withstand high temperatures. They are also electronically conductive and can help reduce EMI by grounding the heat sinks to the PCB. Brass is often preferred over other metals because of their machinability and cost-effectiveness. But brass is prone to work hardening and cannot be heat treated (it becomes soft when heat is applied). Without proper release of the work-hardening stress, the reliability and reusability will be reduced.
Steel push pins are similar to brass push pins. They can withstand high temperatures and are electronically conductive. Unlike brass, steels have high yield strength, and their work-hardening stress can be easily removed through heat treatment. As a result, the push pins can be repeatedly inserted and extracted from PCB holes more than a hundred times without apparent degradation. They are also more secure than brass push pins when the system experiences strong vibration or shock. We recommend steel push pins for high-temperature and harsh-environment systems or when electrical conduction is required.
At MyHeatSinks, we offer steel, brass, and nylon push pins in various sizes. They are developed to fit holes of 3.0, 2.5, and 1.5 mm in diameter. Please visit our heatsink attachment page to find the right push pins that best fit your design.
Cannot Find the Right Heat Sink?
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