How do I choose the right DC power supply or regulator for my project?

Select a supply with the required output voltage and peak current plus 20–30% headroom, and compare switching versus linear types for efficiency, noise and heat. Check ripple, transient response, connector type and required protections (fuse, overcurrent); confirm stock and lead times on communica.co.za and request branch collection or a VAT invoice at checkout if needed.

What thermal-management options are appropriate for power components?

Common options include heatsinks sized for the component's power dissipation, thermal pads or paste to improve interface conductivity, and fans or forced-air for higher dissipation; ensure an unobstructed airflow path. Choose mounting methods and materials compatible with the component package and expected ambient temperature.

How do I calculate the thermal resistance needed for a heatsink?

Use R? ? (Tj_max ? Tamb) / P where P is steady-state power dissipation, Tj_max is the component's maximum junction temperature and Tamb is the expected ambient temperature, and include a safety margin. Account for junction-to-case and case-to-heatsink resistances when selecting a heatsink.

Can I connect a battery pack in parallel with a DC supply or charge a battery from a bench supply?

Do not parallel or charge batteries directly without a chemistry-specific charger and protection circuitry, as cells require controlled charge profiles and overcurrent/temperature protection. Prevent backfeed between sources with appropriate isolation (charging module, diode or ideal-diode circuit) and follow the battery manufacturer's recommendations.

How should I dispose of or recycle used power supplies, batteries and thermal materials in South Africa?

Do not place batteries or electronic power modules in general waste; take them to municipal hazardous/e?waste collection points or licensed e?waste/battery recyclers and follow local disposal rules. Isolate or tape battery terminals to prevent short circuits before transport and consult product datasheets for any special handling instructions.

Top Thermal Pads for Electronics: Selection, Specs, and Local Advice

Discover the best thermal pads for electronics projects. Compare materials, specs, and locally available brands for makers and industry in South Africa.

Published:April 10, 2026

4 min read

Image supplied by 123RF

Thermal Pad Types Explained

See silicone, graphite, and gel options compared by use and performance.

Selection & Sizing Tips

Get practical advice on thickness, conductivity, and application examples.

Find Local Stock Easily

Explore trusted thermal pad brands with fast SA branch pickup at Communica.

Overview: Why Use Thermal Pads in Electronics?

Controlling heat is critical in modern electronics. From microcontrollers and power ICs to single-board computers and power amplifiers, excess heat can lower efficiency, affect signal quality, or even cause premature failure. Thermal pads provide an easy, low-mess way to bridge heat sinks and hot components, improving thermal contact where air gaps would hinder performance.

Consideration: In South African climates, ambient temperatures can fluctuate widely. Selecting the right thermal interface can help maintain stable operation in labs, CNC shops, and maker workspaces where cooling is essential.

Thermal Pad Types: Material Choices and Applications

Silicone-based thermal pads: Flexible, conformable, with moderate to high thermal conductivity. Ideal for most hobby, robotics, and embedded projects.
Graphite pads: Ultra-thin, high-conductivity, and electrically conductive; best for compact or advanced cooling, e.g., Raspberry Pi, MOSFETs, and VRMs.
Gel-form or putty pads: Very soft and easy to compress for uneven surfaces, common in high-end CPU/GPU or high-power industrial assemblies.

Type	Key Features	Thermal Conductivity (W/mK)	Example Applications
Silicone	Soft, easy fit, dielectrically safe	1-6	MCUs, drivers, LED modules
Graphite	Very thin, very high conductivity	8-12	SBCs, VRMs, RF modules
Gel/Putty	Highly compressible, uneven surfaces	3-9	High-power CPUs, IGBTs

Thermal Pad Specifications: What to Look For

Thermal conductivity (W/mK): Higher = better heat transfer.
Thickness (mm): Ensures good surface contact; too thick can hinder transfer.
Electrical insulation: Most silicone pads are non-conductive, protecting sensitive circuits.
Operating temperature range: Needed for components in hot or enclosed spaces.
Reusability: Some pads can be removed and repositioned; check manufacturer specs.

Popular brands available locally at Communica include 3M, Bergquist, Aavid Thermalloy, and generic lines suited for maker, educational, and light industrial use. Always match your choice to the component's footprint and heat dissipation requirement.

Selection Criteria for Your Application

The ideal thermal pad balances conductivity, durability, and correct fit. For DIY, lab, or student projects, pads are often precut to standard sizes (e.g., 15x15 mm, 20x20 mm) and thicknesses, such as 0.5 mm, 1 mm, or 2 mm. For industrial repairs or custom builds, sheets can be trimmed using scissors for precise coverage.

Tip: In South Africa, availability may vary by branch and brand; planning ahead for bulk or specialized projects is recommended, especially for university electronics labs and professional workshops.

Calculations & Real-World Examples

Understanding the role of a thermal pad in a thermal stack is crucial. The basic formula for temperature drop across a pad is:

T = (Power x Thickness) / (Area x Conductivity)

For example, cooling a 7W MOSFET (footprint: 20x20 mm) with a 1 mm silicone pad (conductivity: 3 W/mK):

Area = 0.0004 m²
Power = 7W
Thickness = 0.001 m
Conductivity = 3 W/mK
T = (7 x 0.001) / (0.0004 x 3) ~ 5.83 degreesC

A T of under 10 degreesC across the pad is generally acceptable. Reducing thickness or selecting a higher conductivity material further lowers device temperature.

Installation Tips & Troubleshooting

Clean both surfaces (chip and heatsink) before application.
Gently press the pad for full contact, avoiding wrinkles or bubbles.
Confirm correct thickness: too thick may prevent snug mounting, too thin may leave gaps.
After installation, verify temperature drops using a multimeter with temperature probe or an IR thermometer (available at Communica).
If heat issues persist, review pad sizing, or consider a higher-performance material like graphite.

Note: Popular thermal pads are routinely in stock at Samrand, Pretoria, and Cape Town Communica branches. Branch collection and VAT-invoicing are available for procurement teams, technicians, and educational institutions.

Locally Available Brands and Where to Find Them

To browse or compare, check the Power & Thermal Management category or use the Shop by Brand index to source 3M, Aavid, and other lines tailored for your needs.

Summary Table: Thermal Pad Specs at a Glance

Brand	Type	Conductivity (W/mK)	SA Availability
3M	Silicone/Gel	2-6	Regular Communica stock
Aavid Thermalloy	Silicone	3-4	Selected lines; check lead time
Generic/Maker	Silicone/Graphite	1-12	Most branches

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Very friendly and helpful; and a wide selection of items (at their location). You can also purchase via their WebSite; I have never been disappointed...

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I have a weird project with weird stuff I needed and Cynthia was super helpful and patient with me searching and deciding on what to get. Awesome serv...

I have been buying from Communica for many years now, since they were originally situated in Mooi street in Braamfontein. In general they have friendl...

Thy have a wide range of components. Thy do have a q to wait in but 1 come 1 serve. But while you wait thy have very cool stuff to look at you will al...

From warm welcome by the security check when you enter the store to sales man, then all the way to ladies behind the counter, one of them even organi...

Very pleased with the service from layla and nicole they were extremely helpful and full of smiles... Thank you ladies keep those bright spirits shini...

Any electronic parts available, chargers, batteries, camera and security stuff and mega big store. One of my favorite places to go with helpfull frien...

Excellent customer service all the way! Amazing, welcoming and energetic staff, especially Steven, Sydney and Nicole. This company is the gold standar...

Well organised store, excellent system of service and short waiting period. Staff (Nicole) was very helpful and passionate about the company, it very ...

What an absolute gem Layla is! She went out of her way to source my requested items from another branch, without me asking, and done so with a great b...

I had a fantastic experience at Communica, thanks to the exceptional service provided by Rehaan in sales and Nicole at the cashier. Rehaan was incredi...

Got assisted by a very patient and diligent gentleman by the name Sydney. He was patient in getting me what I needed from the little information I gav...

The kind gentleman right behind the turnstiles at the entrance sales counter helped me immediately as I walked in, Sydney, I think. I needed 8 packs o...

Rehaan was very helpful. He walked woth me through the store and assisted me to get all the items I needed. He also referred me to places that could h...

Amazing services Rehaan is the best, just ask for him. Just excellent service. You may end up buying more things than you had planned though. But it ...

I had a fantastic experience with Communica. Whenever I need electronics on short notice, their sales and logistics team always goes the extra mile to...

Can i give Fatima her flowers.... 10 000 out of 100. Customer service-100% Patience-100% Product knowledge-100% Had the best shopping experience there...

Good service good people great customer care never disappoint me when I'm looking for anything in need always smiling and welcoming...this time when I...

My special appreciation to Windie, with her super customer service. Keep up the good work my sister. Individuals like you gives us more peace to retur...

Fantastic service and help received by Nicole. Communica in general has amazing range of products and solutions to meet my business and personal needs...

After searching for a product on the net, Communica was one of several hundred suppliers found. I couldn't be more pleased with my decision to choose...

Sydney was an awesome help, he approached as we walked in for assistance. Nicole was such a darling and very helpful as well. Awesome first time exper...

Ordered online, was just after 6am. Asked if I can pick items up as I wanted to install over the weekend and delivery stated 2-4 working days. Though...

Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...

At the till we met Nicole, First of her name! The rightful heir to the iron throne! the Unburnt, Breaker of Chains and pillar of strength at Communic...

Rehaan was the sales representative that helped us. He was friendly and helped us with in seconds. We where very pleased with the service and the expe...

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Online service is extremely great.. Had an amazing chat with one of the online chat consultants. Gave me info I needed, and we talked about my passion...

Lovely 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...

I met Leburu and Nicole at the shop, Leburu took me to the right place with a great smile, then took me with my stuff to cashier Nicole where I paid a...

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 ...

Ordered 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...

Unbelievable!! It is now Saturday evening 23 December - 21:15 - and just finished online assistance from Communica - this is service I am not used to ...

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...

Cynthia 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 ...

After spending 2 days hunting for a component i found it here. Dealt with someone telefonically. Help was quick, answered all questions, and called me...

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...

Received exceptional service. They were quick to answer my website enquiry. Then they went out of their way to make up a special industrial automatio...

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Received excellent service as always from Communica, placed an order yesterday for a new Multimeter and was delivered today at 10am, goods were sent f...

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Excellent 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...

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Electronic 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...

Top Thermal Pads for Electronics: Selection, Specs, and Local Advice

Thermal Pad Types Explained

Selection & Sizing Tips

Find Local Stock Easily

Communica South Africa

Overview: Why Use Thermal Pads in Electronics?

Thermal Pad Types: Material Choices and Applications

Thermal Pad Specifications: What to Look For

Selection Criteria for Your Application

Calculations & Real-World Examples

Installation Tips & Troubleshooting

Locally Available Brands and Where to Find Them

Summary Table: Thermal Pad Specs at a Glance

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