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Explore the essential roles of 0R15 resistors in current sensing, power supplies, and motor drives. Learn practical selection tips and find locally stocked options at Communica.
0.15Ohm resistors enable low-loss current sensing in power, motors, and battery management.
Used to safely limit inrush currents in supplies, chargers, and LED drivers.
Find 0R15 values in stock at Communica for education, repair, and industry builds.
A 0R15 (0.15 ohm) resistor is a low-value, high-precision resistor designed for applications needing minimal voltage drop but accurate current measurement or control. Also known as a current sense resistor or shunt resistor, 0R15 values are common in power electronics, motor drivers, battery management, and protection circuits. Due to their low resistance, they are typically built for higher power handling and low temperature coefficient.
| Property | Typical Range | Notes |
|---|---|---|
| Resistance Value | 0.15Ohm 1-5% | Marked as 0R15, R150, or 150mOhm |
| Power Rating | 0.125W to 5W+ | Choose higher wattage for motor/power use |
| Tolerance | 1% (F) to 5% (J) | 1% preferred for accurate measurement |
| Form Factor | Through-hole, SMD (1206/2512, wirewound, cemented) | Pick SMD for compact PCBs; wirewound for high current |
Very low-ohm resistors like 0R15 are ideal where you want to sense substantial current (e.g., a few amps) but lose as little voltage (and power) as possible. The low resistance provides measurable voltage drop (V = I x R), typically for feedback to op-amps, microcontroller ADCs, or protection circuits. This is essential in the following South African scenarios:
When selecting a 0R15 resistor, always check:
Suppose you want to measure current in a 5V DC motor drive circuit, with a maximum expected current of 3A. By using a 0.15Ohm resistor in line, you can easily sense the current as follows:
| Formula | Calculation | Result |
|---|---|---|
| Voltage drop (V = I x R) | V = 3A x 0.15Ohm | 0.45V |
| Power dissipation (P = I2 x R) | P = (3A)2 x 0.15Ohm | 1.35W |
In this case, you should select at least a 2W resistor to ensure safe operation, allowing for some headroom for peak conditions. The voltage (0.45V) can be fed to an op-amp or ADC for current monitoring.
[+5V] ----[Motor]----+----[0R15 Resistor]----[- GND]
|
Sense
(ADC)
Here, the voltage across the 0R15 resistor is directly proportional to motor current, aiding in safe feedback and limiting circuits.
0.15Ohm resistors are simple, affordable components that underpin advanced current measurement, power management, and protection tasks across South African education and industry. Selecting the right variant-accounting for power, tolerance, and size-ensures reliable operation in your project. For in-stock resistors, accessory bundles (heatsinks, clips), and design support resources, explore Communica's Resistors and Test & Measurement categories.
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