Introduction to KOA resistor categories

The categories of KOA (KOA Speer Electronics) resistors can be classified from multiple dimensions, including product type, packaging form, material process, precision level, and application field. The following are the main categories and characteristics of KOA resistors:
1、 Classified by product type
Universal resistor
Series: RK73 series (thick film chip resistor)
Features: Standard thick film process, high cost-effectiveness, size coverage from 0402 to 2512, optional accuracy of ± 1% and ± 5%.
Application: General consumer electronics, home appliances, communication equipment.
Sheet resistance
Series: RN73 Series (Metal Film Thin Film Resistors)
Features: Thin film process, high precision (± 0.1%), low temperature coefficient (± 25ppm/℃).
Applications: High frequency circuits, audio equipment, precision power supplies.
power resistor
Series: PWR series (high-power wound resistor)
Features: Power range of 5W to 50W, strong resistance to impact current.
Application: Industrial power supply, charging station, motor drive.
Special Application Resistors
Series: LR series (low resistance current detection resistor), SR series (high voltage resistor), TR series (temperature sensor resistor)
Features: Designed for specific needs such as low resistance, high voltage endurance, temperature sensitivity, etc.
Applications: current sampling, battery management, high-voltage testing equipment, temperature compensation, etc.
Automotive grade resistor
Series: ARK73 series (automotive grade thick film resistors), ARN73 series (automotive grade thin film resistors)
Features: Compliant with AEC-Q200 standard, resistant to high temperature, humidity, and vibration.
Applications: Automotive electronic control systems, ADAS systems, battery management systems.
Miniature resistor
Series: RK73Z series (0201 ultra small resistor)
Features: Extremely small size (0.6mm × 0.3mm), suitable for high-density PCBs.
Applications: Smartphones, wearable devices, IoT modules.
2、 Classified by packaging form
Surface mount resistor (SMD)
Series: Covering various sizes from 0201 to 2512, suitable for automated surface mount production.
Applications: consumer electronics, communication devices, automotive electronics, etc.
Plug in resistor (Through Hole)
Series: Some models in the MCR series (metal oxide film resistors).
Features: Suitable for scenarios that require manual welding or special installation.
Applications: industrial equipment, lightning protection modules, etc.
3、 Classified by material and process
thick film resistor
Series: RK73 series, RK73B series (anti sulfurization thick film resistor)
Features: Low cost, suitable for general precision requirements.
Application: General electronic devices.
Sheet resistance
Series: RN73 series, RN73H series (high-precision thin film resistor)
Features: High precision, low temperature coefficient, good stability.
Application: Precision instruments, medical equipment.
metal oxide film resistor
Series: MCR Series
Features: Resistant to pulse loads, suitable for high-power scenarios.
Application: Lightning protection module, surge protection circuit.
4、 Classified by accuracy level
Standard accuracy
Accuracy range: ± 1%, ± 5%
Series: RK73 series
Application: General electronic devices.
high-precision
Accuracy range: ± 0.5%, ± 0.1%
Series: RK73H series, RN73 series
Application: Precision instruments, testing and measurement.
Ultra high precision
Accuracy range: ± 0.01%
Series: RN73H series
Applications: Aerospace, military electronics.
5、 Classified by application field
Consumer Electronics
Series: RK73 series, RK73Z series
Applications: Smartphones, tablets, Bluetooth earphones.
Automotive Electronics
Series: ARK73 series, ARN73 series, RT73 series
Applications: Automotive ECU, ADAS system, battery management system.
Industrial control
Series: PWR series, MCR series
Application: Industrial power supply, motor drive, charging station.
medical equipment
Series: RN73H series, Schurter series (some cooperative models)
Applications: ventilators, monitors, precision medical instruments.
Aerospace/Military Industry
Series: RN73H series (high precision), ECG series (anti radiation)
Applications: satellite communication, missile guidance, military radar.
How to choose KOA resistor category?
According to accuracy requirements: select ± 1% accuracy for general scenarios, and ± 0.1% or higher for precision instruments.
According to power requirements: choose surface mount resistors for low power and PWR/MCR series for high power.
According to environmental adaptability: choose AEC-Q200 certified models for automotive electronics, and choose sulfur resistant or high-pressure series for special environments.
According to the packaging size: choose 0201/0402 size for high-density PCB, and choose the plug-in model for manual soldering.
It is recommended to refer to KOA's official selection guide or contact their technical support team for customized recommendations based on specific application scenarios, circuit design requirements, and cost budgets.