What are the categories of KOA resistors?

The following is a detailed explanation of resistor categories based on KOA official information and industry applications, combined with technical characteristics and scenario requirements:
 
1、 Classified by material, process, and structure
  
Thick film resistor series
 
RK73 series: Basic universal type, thick film process, high cost-effectiveness. Covering sizes 0402~2512, with an accuracy of ± 1%~± 5% and a temperature coefficient of ± 100~300ppm/℃.
Derivative models:
 
RK73H: High precision version (± 0.5%), preferred for industrial instruments.
 
RK73B: Anti sulfurization coating design, suitable for sulfur-containing environments (such as automotive electronics).
WK73 series: long side electrode design, excellent heat dissipation performance, power of 0.33W~3W, used for power modules and vehicle BMS systems.
 
Thin film resistor series 
 
RN73 series: metal thin film process, accuracy ± 0.1%, temperature coefficient as low as ± 25ppm/℃. Suitable for high-frequency circuits and medical equipment.
 
RN73H: Ultra precision grade (± 0.01%), used for aerospace and high-end testing instruments.
RT73 series: automotive grade thin film resistor, certified by AEC-Q200, resistant to high temperature vibration, compatible with automotive ECU and ADAS systems.
 
Alloy/Metal Plate Resistance Series
 
SL/TSL series: metal plate structure, resistance as low as 3m Ω, power 0.75W~7W. Resistant to high current impact, used for power management and motor drive.
SR73/LR series: current detection dedicated resistor (24m Ω~10 Ω), accuracy ± 0.5%, temperature coefficient ± 100ppm/℃. Applied to battery management and industrial motors.
 
2、 Classified by Function and Application Scenarios
Category represents the core characteristics of the series, typical application areas
High power resistor PWR/MCR power 5W~50W, pulse resistant load charging station, industrial power supply
 
High voltage resistor SR/HV73 can withstand up to 10kV, with strong insulation for power equipment and medical imaging systems
Miniature resistor RK73Z 0201 ultra small package (0.6 × 0.3mm) for smartphones and wearable devices
Automotive resistance ARK73/ARN73 AEC-Q200 certification, resistant to wet and hot vibration, new energy vehicle electronic control system
Temperature Sensor TR Series NTC/PTC Thermistor, Range -55 ℃~+300 ℃ Environmental Monitoring, Overheating Protection
 
3、 Special technical resistor
Anti sulfide resistance: RK73B series adopts a special coating to prevent resistance drift caused by sulfide corrosion and extend the service life of industrial equipment.
 
Surge resistant resistor: SG73P series anti pulse design, capable of withstanding instantaneous high voltage impact, used for lightning protection modules and power protection circuits.