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Learn how the CFR50J-1K8 carbon film resistor compares to metal film and wirewound types. Review specs, use cases, and sourcing tips for South African makers.
Explore resistance, tolerance, and power ratings suitable for most common applications.
See how carbon film, metal film, and wirewound resistors differ in function and cost.
Advice on sourcing resistors, understanding lead times, and compatible brands at Communica.
The CFR50J-1K8 is a commonly used carbon film resistor with a resistance value of 1.8 kOhm (kilo-ohm), a 0.5W (watt) power rating, and a 5% tolerance ("J" code). Its popularity stems from its balance of performance, cost, and widespread compatibility for general-purpose circuits - whether in hobby projects, schools, or industrial repairs.
In South Africa, such resistors are a staple at electronics suppliers like Communica, making them readily available for students, makers, and maintenance teams requiring VAT documentation and fast, local collection.
Understanding when to select a carbon film resistor like the CFR50J-1K8 - versus metal film, wirewound, or surface mount varieties - can improve your circuit reliability and keep build costs down. Here's a quick comparison of features:
| Type | Typical Power | Tolerance | Noise (uV/V) | Best Use Cases | Cost Range* |
|---|---|---|---|---|---|
| Carbon Film (CFR50J-1K8) | 0.25-0.5W | 5% | Medium | Prototyping, basic analog/digital | R0.20-R0.50 |
| Metal Film | 0.25-2W | 1% to 5% | Low | Precision, low-noise circuits | R0.50-R1.20 |
| Wirewound | 1-25W+ | 2% to 10% | Very Low | High power/industrial loads | R3-R12 |
| SMD Chip | 0.06-0.5W | 1% to 5% | Low/Medium | Compact PCB, reflow soldering | R0.15-R0.40 |
*Estimated ZAR pricing at South African retail for educational/lab pack quantities as of 2024; check Communica's site for current stock and volume discounts.
The decision between carbon film (like CFR50J-1K8), metal film, wirewound, or SMD resistors depends on your project needs. Here are key factors to consider:
Suppose you want to use a CFR50J-1K8 to limit an LED at 10mA from a 12V supply. What is the power dissipated across the resistor?
A CFR50J-1K8 (0.5W rating) is well suited in this example, running at just over 10% of its maximum safe dissipation, ensuring low heating and reliable operation.
At Communica, you'll find carbon film resistors (including CFR50J-1K8 equivalents) from brands like Royal Ohm, Yageo, and Uniohm, as well as exact-value kits for student labs. Visit the Resistors category for fast local shipment or in-branch pickup.
In South Africa, lead times are typically 1-2 days for in-stock lines, while special order/resistor kits may require up to 2 weeks if out of stock. Consider buying small quantity packs or mixed kits for education and repeated prototyping.
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
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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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Visited a couple of times for supplies and specialised parts Staff is extremely friendly and always helpfull
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Awesome service from Sydney and Nicole...keep up the great job guys
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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 was assisted by Fatima. She was friendly, patient and professional. Thanks for the great service!
Verified customerGreat service. Cynthia has great knowledge of product and very friendly and helpful
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Verified customerI 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...
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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...
Leila was very helpful and super nice!
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Fatima was very helpful and patient with my many queries. The shop itself has seen better days but the service was great.
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Great experience with every purchase thanks to Sydney and nicole
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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...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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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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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
Verified customerFast good price service. Thank you Sydney.
Verified customerThanks Fatima for an excellent service
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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
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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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Sydney and Nicole were amazing I came in and finished within no time thank you so much keep up the friendly service
Verified customerCustomer service is excellent. Thank you to Mpho for helping me get what I need from the store
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Verified customerThe service I always get from Sydney And Lacy the Cashier is amazing. Those are my guys...keep up the good works gentlemen.
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.
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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.
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Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
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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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Verified customerREHAAN and Nicole are extremely helpful and friendly people made my experience at communica a breeze to shop. Thank you again for the help.
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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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Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerPatient and kind
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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
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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.
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.
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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 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.
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Verified customerVery helpfull. Thank you
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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
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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
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Verified customerAll your electronics requirements under one roof, and more!
Verified customerThe place to go whatever your electrical and electronics needs.
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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
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Verified customerGet electronic kits
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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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