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Learn about CFR25J 100kOhm resistors - standards, ratings, selection tips, and local stock at Communica for students, makers, and engineers in South Africa.
Learn their ratings, tolerance, and suitability in various circuits.
See practical uses and calculation tips for student and industry projects.
Find stock, VAT invoices, and quick pickup at Communica branches.
CFR25J 100kOhm resistors are a cornerstone for circuit builders in South Africa, widely used in voltage divider networks, filtering, and biasing applications. These carbon film resistors offer a balanced mix of reliability and affordability, making them a go-to for students, home labs, and industrial prototyping alike. Understanding their characteristics, best uses, and sourcing locally will help you complete designs with confidence - and within budget.
In South Africa, CFR25J series resistors are commonly available at suppliers like Communica, both as individual units for breadboarding and packs for production runs.
| Property | CFR25J 100kOhm Value | Notes |
|---|---|---|
| Resistance | 100kOhm 5% | Marked with four color bands: Brown, Black, Yellow, Gold |
| Power Rating | 0.25W (250mW) | Ensure power dissipation doesn't exceed rating |
| Voltage Rating | <=250V | Above this, breakdown may occur |
| Tolerance | 5% (J) | Adequate for most general-purpose circuits |
| Temperature Range | -55 degreesC to +155 degreesC [typical] | May vary by brand |
Most CFR25J 100kOhm resistors at South African distributors comply with international component standards and arrive pre-formed for through-hole (THT) insertion, making them easy to use in breadboards or PCBs.
100kOhm resistors are essential in designs such as:
Tip: For educational kits and lab builds, the CFR25J 100kOhm is a staple found in almost every project starter set distributed by South African suppliers.
Use Ohm's Law and the power formula to check:
For example: If you drop 10V across a 100kOhm resistor, P = (10 x 10) / 100,000 = 0.001W (1mW), well within a 0.25W rating. For projects powered by 3.3V or 5V microcontroller rails, load currents are safely low.
Vcc ---[100kOhm]---*---
|
Signal
|
GND
This simple pull-down arrangement is common in input conditioning for microcontrollers or logic gates.
In South Africa, VAT invoices are standard, making procurement for universities and companies straightforward. Communica's branches in Samrand (Centurion), Pretoria, and Cape Town offer pickup and quick local delivery for all passive component needs.
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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