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Comprehensive troubleshooting guide for CFR50J 15K carbon film resistors. Find causes, testing tips, and real-world fixes for students and techs in South Africa.
Learn quick tests and signs a 15K carbon film resistor may be failing.
Burnout, drift, solder issues: explore what goes wrong with CFR50J resistors.
Find compatible stock and get reliable alternatives locally at Communica branches.
The CFR50J 15K resistor is a 15,000 ohm (15 kOhm) carbon film fixed resistor, rated for 0.5W power handling (as indicated by the '50' in CFR50J). This component is a common choice for signal conditioning, pull-up/pull-down, LED current limiting, and general purpose use in hobby, educational, and industry builds across South Africa. Communica regularly supplies these resistors for breadboards, PCBs, and repairs due to their balance of price, performance, and availability.
| Parameter | Spec | Notes |
|---|---|---|
| Resistor Type | Carbon Film | General purpose, cost-effective |
| Power Rating | 0.5 W (1/2 Watt) | Ambient temp 20-25 degreesC; derate at higher temps |
| Resistance | 15 kOhm (15,000 ohm) | Standard E24 value, 4-band code: brown, green, orange, gold |
| Tolerance | 5% (J) | Gold band; real world: 14.25-15.75kOhm typical range |
| Typical Applications | Signal, bias, LED, pull-ups | Low-mid power circuits |
Many issues occur from exceeding the resistor's rated power or operating in high temperature environments (above 70 degreesC ambient), common in South African summers or poorly ventilated enclosures.
| Measured Value | Expected Behaviour | Action |
|---|---|---|
| 14-16 kOhm | Normal (within 5%) | Leave in circuit |
| Much higher (>20 kOhm) | Possible drift, heat damage, or dry joint | Replace resistor; resolder joint |
| Open circuit | Burnt out; non-functional | Replace immediately |
To check for overheating risk, use Ohm's law:
P = V2 / R or P = I2 x R
If 30V is across a 15kOhm resistor:
P = (30 x 30) / 15,000 = 0.06 W
This is well below the 0.5W limit, so safe. But with 87V:
P = (87 x 87) / 15,000 ~ 0.51 W
This is right at the maximum rating and risks premature failure, especially in small enclosed electronics typical in budget South African designs. Always allow at least 20% headroom for reliability.
Replacement CFR50J 15K resistors typically cost under R2-R5 each (bulk discounts sometimes available via Communica).
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.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
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