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Discover how to use CFR25J 20K resistors in circuits. Get datasheet specs, circuit tips, power ratings, and practical advice for South African makers from Communica.
Breakdown of resistance, tolerance, and power rating for confident circuit use.
Step-by-step on Ohm's Law, series/parallel use, and breadboard tips.
Explore local availability, popular brands, and collection options from Communica.
The CFR25J 20K resistor is a carbon film resistor with a resistance value of 20,000 Ohms (20K Ohm), a 1/4 watt (0.25W) power rating, and typically 5% tolerance. These resistors are widely used in analog, digital, and audio circuits across South Africa's maker, student, and engineering communities due to their balance of cost, size, and reliability.
| Parameter | Value |
|---|---|
| Resistance | 20,000 Ohm (20K) |
| Power Rating | 0.25W (1/4 Watt) |
| Tolerance | 5% (J) |
| Type | Carbon Film, Axial Leaded |
| Typical Max Voltage | <=250V (varies by brand/datasheet) |
The CFR25J code structure: "CFR" stands for Carbon Film Resistor, "25" is the 0.25W rating, "J" indicates 5% tolerance, and "20K" is the resistance value. These resistors are supplied individually or in bulk for prototyping and production, and are stocked by many local suppliers, including Communica's branches in Samrand, Pretoria, and Cape Town.
CFR25J 20K resistors are ideal for both theoretical coursework and hands-on prototyping due to their recognisable colour bands (red, black, orange, gold) and ruggedness. For educational institutions, these resistors are widely used in electronics lab kits and are generally available from South African suppliers with VAT invoicing and branch pickup options.
Most CFR25J 20K resistors comply with standard international resistor specifications for carbon film types. Check specific datasheets for brands such as Royal Ohm, Yageo, or UniOhm for details on:
When choosing a CFR25J 20K resistor, key factors include:
Suppose you need to scale down a 12V input to approximately 4V using a voltage divider. Pair a 20K resistor (R1) with a 10K resistor (R2):
| Parameter | Value |
|---|---|
| Input Voltage (Vin) | 12V |
| R1 (CFR25J 20K) | 20K Ohm |
| R2 | 10K Ohm |
Voltage at divider output (Vout = Vin x R2/(R1+R2)):
Vout = 12V x 10K / (20K + 10K) = 4V
Check the power rating:
P(R1) = V2/R = (8V)2 / 20000 = 0.0032W (well within 0.25W limit)
| Application | Reason to Use | Key Check |
|---|---|---|
| Voltage Dividers | Simple scaling, biasing, sensor input | Confirm Vout with formula |
| Pull-Ups/Pull-Downs | Logic level stabilization | Check MCU IO specs |
| Bias/Feedback | Transistor or op-amp operation | Ensure tolerance is acceptable |
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