Open Air Resistors for High-Current Precision Sensing
Features
1. 1-7watts
2. Tolerance ±5%,±2%and±1%
3. Low inductance
4. Excellent Solder ability
5. RoHS compliant
Description
Open Air Resistors for High-Current Precision Sensing
An open air resistor is specifically designed for applications that require accurate current sensing, stable resistance performance, and efficient heat dissipation under high-current conditions.
With a metal element structure and exposed design, open air resistors are widely adopted in industrial power electronics where reliability and thermal stability are critical.
What Is an Open Air Resistor?
An open air resistor is a resistor with an exposed resistive element that allows direct heat dissipation to the surrounding air.
Unlike encapsulated or cement resistors, this open structure enables natural convection cooling, helping the resistor maintain stable electrical performance even under continuous high current load.
Open air resistors are commonly manufactured using precision metal alloy elements, making them suitable for milliohm-range resistance values and current sensing applications.
Key Features
Power Rating: 5W continuous
Resistance: 10mΩ ±1% (custom values available)
Ultra-low inductance design
Open-air structure for improved heat dissipation
Flameproof, high-current durability
- Technical Specifications
| Item | Specification |
|---|---|
| Rated Power | 1–7 watts |
| Tolerance | ±5%, ±2%, and ±1% |
| L | Low inductance |
| Material | Manganin / Constantan / NiCr / Tinned Copper |
| Mounting Type | Open Air |
Dimension
| Parameter | Specification |
|---|---|
| A | 4.5mm ± 0.5mm |
| H | 13mm ± 2.0mm |
| W | 10mm ± 0.5mm |
| C | 3.3mm ± 0.2mm |
| D | 1.1mm ± 0.1mm |
| L | 1.0mm ± 0.1mm |
| Resistance Value | 10mΩ ± 1% |
| Rated Power | 5W |
| Marking | 5W-10F |
| Operating Temperature | -65℃ ~ 170℃ |
Applications
These resistors are ideal for high-reliability current sensing in:
🔌 Inverters and switching power supplies
⚙️ Industrial motor drives & HVAC compressors
🔋 Battery management systems (BMS)
🖥️ CPU drive control & power tools
🚗 Automotive electronics & energy feedback systems
All our open air resistor products are manufactured using RoHS-compliant materials, ensuring compliance with global environmental regulations and strict control of hazardous substances in electronic components.
For official regulatory details, please refer to the EU RoHS Directive published by the European Commission.
