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Explore aluminium, copper, and alloy heatsinks for electronics. Learn thermal conductivity, pros/cons, and practical tips for South African engineers and students.
Aluminium and copper offer key differences in heat dissipation and cost.
Learn how conductivity, mass, and surface area impact heatsink performance.
Find heatsink profiles and accessories in South Africa at Communica branches.
When managing heat in electronic assemblies, heatsink material choice is a primary factor influencing temperature rise and system stability. Semiconductor junctions (such as power transistors, voltage regulators, and microprocessors) generate heat that must be dissipated safely, particularly in South African summer labs and equipment racks. Two metals dominate: aluminium and copper, sometimes alloyed or combined with heat pipes for high-performance roles. This guide unpacks their physical properties, practical selection criteria, and the engineering trade-offs relevant to your next project.
| Material | Thermal Conductivity (W/mK) | Density (g/cm3) | Advantages | Considerations |
|---|---|---|---|---|
| Aluminium (6063/6061) | 200-220 | 2.7 | Lightweight, cost-effective, easily extruded into fins | Slightly lower thermal capacity vs copper, softer metal |
| Copper | 390-400 | 8.9 | Double the conductivity of aluminium, good for high power | Cost, weight, hard to machine, can oxidise |
| Copper-Aluminium Hybrid | Varies (200-400) | Composite | Copper base for heat spread, aluminium fins for dissipation | Price, fabrication complexity |
Thermal conductivity (measured in W/mK) tells us how efficiently heat flows through a material. Copper transmits heat more than 75% faster than aluminium, but practical heatsink design also relies on factors like fin area and airflow. Aluminium's low density means it can be extruded into large, lightweight shapes-ideal for electronics where weight and cost matter (such as LED lighting, RPi brackets, and industrial controllers).
In South Africa, most heatsinks for semiconductors are extruded aluminium for TO-220, TO-247, D2PAK, and similar footprints. Some high-end CPU/GPU coolers or industrial power blocks use copper inserts or bases. Custom and rare profiles may carry short lead times; common ones (25mm, 40mm, 100mm) are often available ex-stock at Communica's Samrand, Pretoria, and Cape Town branches.
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Core selection involves matching the heatsink thermal resistance (θSA, in °C/W) to your component's power dissipation. This resistance is affected by both material and profile. Here's a simplified calculation:
Necessary θSA is calculated as:
θSA = [ (Tjmax - Ta) / Pd ] - θJC - θCS
For higher conductivity (like copper), θSA is lower-but cost, weight, and size must be balanced.
| Parameter | Value |
|---|---|
| Power Dissipated (Pd) | 5W |
| Max Tj (Tjmax) | 125 degreesC |
| Ambient (Ta) | 35 degreesC |
| θJC | 2 degreesC/W |
| θCS (with compound) | 0.5 degreesC/W |
Plugging into the formula:
θSA = [(125 - 35) / 5 ] - 2 - 0.5 = 16 - 2 - 0.5 = 13.5 degreesC/W
Choose an aluminium heatsink (common TO-220 black anodised types are 10-20 degreesC/W) for moderate South African summer workshops; copper types could allow for slightly smaller profiles but often aren't necessary unless space is extremely limited.
For learners and engineers, Communica offers a broad selection of heatsinks along with accessories like mounting kits, thermal compound, and interface pads. Visit the Tools & Supplies and Power ranges online, or check with your nearest branch for in-person advice and pickup.
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Quick quality customer service.
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Verified customerNicolene
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After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
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Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
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I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
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I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
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Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
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Verified customerService has improved but still a long way to go to actually sort it out.
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Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
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Verified customerA good electrical/electronic sales store packed with almost every component you require
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
Verified customerAlmost all electronic spares available at reasonable prices.
Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
Verified customerExcellent, ask for Sydney. Solved immediately
Verified customerThey have everything you would need. Service is good
Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
Verified customerAll the goodies in one place and Mohamed is always willing to help
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Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
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Verified customerDefinitely will have what you're looking for.
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Verified customergood selection of electronic supplies accessible
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Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
Verified customerRather a slow process
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Verified customerHelpful and efficient
Verified customerPlace if definite interest
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Verified customerFascinating
Verified customerWaiting time can be annoing.
Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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