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Learn what a heat sink does, how to choose one, calculations and troubleshooting for electronics projects. Practical South Africa notes and stock guidance.
Heat sinks reduce junction temperature by increasing surface area and lowering thermal resistance.
Calculate required Rth, consider mounting/interface, airflow, and worst-case ambient temperature.
Combine paste or pads with correct mounting; check local stock and branch pickup options.
A heat sink is a passive thermal device that transfers heat away from electronic components (electronic components (power transistors, voltage regulators, CPUs, power MOSFETs, LEDs) into the surrounding air. By increasing surface area and improving convection, heat sinks reduce component junction temperatures and help maintain reliability. This guide explains types, selection steps, simple calculations, and troubleshooting with practical examples for South African makers, students, technicians and procurement teams.
The basic equation linking these values is:
Tj = Ta + P × Rth_total
Where Tj is junction temperature, Ta is ambient temperature, P is power dissipation, and Rth_total is the sum of thermal resistances (junction-to-case, case-to-sink, and sink-to-ambient).
Consideration: In many student and maker projects, small aluminium extruded heatsinks paired with a thermal pad or paste are sufficient. For continuous high-power applications, factor in forced airflow or larger fin areas. Check local stock and typical lead times via the Communica collections to avoid project delays.
Explore heatsink-related categories and brands in the Communica catalogue to match form factor and mounting style: shop by category, or browse all products for availability here. For company background and service footprint in South Africa, see Communica's about page About Us.
| Type | Typical Rth (°C/W) | Best use |
|---|---|---|
| Small extruded aluminium | 5-20 | Linear regulators, small MOSFETs |
| Large extruded fin array | 2-8 | Power amplifiers, LED arrays |
| Heat-pipe assisted | 0.5-3 | High-power modules, compact enclosures |
Example 1 - Linear regulator: A 7805 dissipating 2.5 W in a 30°C ambient with max junction of 125°C. Required Rth_total = (Tj_max - Ta) / P = (125 - 30) / 2.5 = 38°C/W. Subtract junction-to-case (from datasheet, say 2°C/W) and case-to-sink (with paste, ~0.5°C/W) to find sink-to-ambient target ~35.5°C/W. A small extruded sink with Rth ~10-20°C/W gives ample margin.
Example 2 - Power MOSFET: MOSFET dissipates 10 W, ambient 40°C, allowable junction 150°C. Required Rth_total = (150 - 40) / 10 = 11°C/W. If junction-to-case is 1.0°C/W and case-to-sink 0.5°C/W, sink-to-ambient must be about 9.5°C/W - choose a larger fin array or add forced airflow.
Component (TO-220) | [Thermal Paste] | [Heat Sink] | [Screw/Clip to PCB or chassis]
Communica stocks a range of heatsinks and thermal materials suited to hobbyist and educational projects. When planning, allow for local lead times - typical consumer-grade heatsinks are commonly in stock at the Samrand warehouse, with branch pickup available at Pretoria and Cape Town; check branch hours and availability on the branches page branches page. For procurement teams, Communica supports VAT invoicing and quote requests; view stock categories in the collections area collections area and explore brands on the shop-by-brand page shop-by-brand page.
Always confirm junction-to-case figures and allowable operating temperatures on the component datasheet before finalising a heatsink. If you need help matching a heatsink to a specific part, Communica’s catalogue and product pages can guide selection; start at the homepage Communica homepage to search product lines and availability.
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Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
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I was assisted by Fatima. She was friendly, patient and professional. Thanks for the great service!
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Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
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Excellent service so far
Verified customerSydney offered exceptional service. He took me step by step on what I needed to buy. Thank you Nicole for the service
Verified customerLovely lady serving me named Nicole and I got very good assistance from Leburu on th floor whom directed me toward the correct goods. Will visit again...
Excellent service by Sydney at the ino counter. So many awsome products! Perfect place to buy gifts for tech junky friends.
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Leburu and nicole were both very helpful my boss send me to get few items as I wasn't very familiar with the items Leburu and my boss spoke with each ...
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Verified customerOrdered online. Got my order in less than 24 hrs. I was updated all the time on the progress. I have never seen service like this. Thanks and well don...
Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
azul and Nicole were very helpful and very efficient
Verified customerCynthia at the counter is always very helpful, in fact, all the counter sales ladies are very helpful. Can't say the same for the staff when calling ...
They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
Verified customerVery helpful and really do know their stuff and incredible service absolutely amazing store.
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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
Verified customerExcellent efficient service with quality products. Despatch process and the counter sales are exceptionally well
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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I received a great service from Rehaan, Windy and Nocole. Excellent customer service.
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Quick quality customer service.
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Very good service and a happy welcoming smile from the cashier Nicole
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Anyone that seriously loves technology ought to spend time here. They definitely have what you want. Best tech store!
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Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerMy electronics go to place
Verified customerGreat service
Verified customerSydney en Lacy was baie hulpvaardig. Goeie diens!
Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
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...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
Verified customerGreat inventory. Very slow service, though the staff seem to do their best. Single till open mostly with overbearing security measures. Can do with so...
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.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
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
Verified customerI had some electronic work to be done.Personell very friendly and helpful .Topclass business
Verified customerElectronic supply store if you like tinkering it's got the goods the tills are slow so don't expect a in and out visit especially if there is two or m...
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.
Verified customerGood job Nicole! Well done!
Verified customerSlowest service ever! Even worst cashiers. I shudder to go. Good products though.
Verified customerGood service, would recommend.
Verified customerWide range of electronics for the diy enthusiastic, ranging from solar systems to alarms and cctv.
Verified customerGreat for electronics but stock is a problem quite often so call before going through.
Verified customerService has improved but still a long way to go to actually sort it out.
Verified customerFriendly service and a vast range of electronic components, devices etc.
Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
Verified customerGood verity of products. Helpful staff albeit a bit slow
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Verified customerGreat service from Cynthia and Nicole
Verified customerBest prices for cameras and alarm systems and very helpful staff
Verified customerSomethings are getting pricey, but still a good place to pick up components
Verified customerNicole and Sydney were very helpful
Verified customerElectronic store for DIY electronics and prototyping guys. Doesn't look all that great but should have what you're looking for.
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
Verified customerWide variety of electronic goods. Staff helpful with good advise.
Verified customerGood verity, lots of stock, mostly helpful staff
Verified customerVery helpfull. Thank you
Verified customerWide variety of components and electronic goods. Helpfull personel.
Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
Verified customerGreat for your electronic needs - Prices are a bit expensive
Verified customerGreat showroom, electronics hobbyist's paradise
Verified customerGreat place to find electronic stuff.
Verified customerDefinitely will have what you're looking for.
Verified customerCheap electronics and great educational goodies for the kids
Verified customergood selection of electronic supplies accessible
Verified customerGreat variety of stock on hand
Verified customerGood variety of electronic components available
Verified customerWide variety of electronic supplies available here
Verified customerVery good
Verified customerBig variety and good prices
Verified customerAll your electronics requirements under one roof, and more!
Verified customerThe place to go whatever your electrical and electronics needs.
Verified customerExcellent range of electronic products
Verified customerInteresting & you can find everything here
Verified customerGreat selection of electronic components
Verified customerGreat electronics and hobbiest shop
Verified customerAmazing range of products.
Verified customerVery helpful and professional
Verified customerGood range of electronic components
Verified customerGreat man shop
Verified customerVery wide variety of electronic components
Verified customerFantastic range of goods
Verified customerTidy store with a lot of variety
Verified customerLove everything here...
Verified customerGood range of products
Verified customerWhatever you need they have
Verified customerLarge number of electronic components
Verified customerCan spend hours in there
Verified customerRather a slow process
Verified customerExcellent merchandising
Verified customerGood products
Verified customerHelpful and efficient
Verified customerPlace if definite interest
Verified customerGet electronic kits
Verified customerWide range of components
Verified customerGreat variety
Verified customerGood service
Verified customerElectronic components wholesaler
Verified customerloads of electronic components
Verified customerelectronics sales warehouse
Verified customerCool
Verified customerhuge selection
Verified customerCool electronics
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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