The following is a comprehensive introduction to the KOA resistor series, combined with product characteristics and application scenarios:
1、 KOA resistor core series classification
Universal resistor series
RK73 series (thick film chip resistor)
Features: Standard thick film process, high cost-effectiveness, size coverage from 0402 to 2512, accuracy of ± 1% to ± 5%, temperature coefficient of ± 100~300ppm/℃.
Subdivision models:
RK73B: Anti sulfurization coating design, suitable for sulfur-containing environments (such as automotive electronics, industrial control).
RK73G: High precision low-temperature float (± 0.5% accuracy, ± 50ppm/℃), in compliance with AEC-Q200 vehicle specification standards.
Applications: Consumer electronics, home appliances, power modules.
Thin film resistor series
RN73 series (metal film thin film resistor)
Features: Ultra high precision (± 0.01%~± 0.1%), ultra-low temperature drift (± 5-50ppm/℃), excellent long-term stability.
Subdivision models:
RN73H: High temperature resistant type, supports wide temperature operation from -55 ℃ to+155 ℃, suitable for precision instruments and vehicle sensors.
RT73: Vehicle grade certification (AEC-Q200), resistant to vibration and impact.
Applications: high-frequency circuits, medical equipment, aerospace.
Power resistor series
PWR series (wound resistance)
Features: Power 5W~50W, shock current resistance, excellent heat dissipation performance.
MCR series (metal oxide film resistor)
Features: High power density (resistance density of about 6%), pulse load resistance, suitable for surge protection circuits.
Typical model: MCR630 (dense structure, resistance density of 0.094a/km, meeting the requirement of about 6%).
Application: Industrial power supply, motor drive, charging station.
Special Application Resistance Series
Low resistance detection resistor (LR/SR series)
Features: Resistance value of 0.001 Ω~0.1 Ω, accuracy of ± 1%, temperature coefficient of ± 75~100ppm/℃.
Model: SR73 (current detection), TSL1/SL1 (metal plate resistance, high current resistance).
High voltage resistor (SR/HV73 series)
Features: With a voltage resistance of up to 10kV, it is suitable for power electronic equipment.
Surge resistant resistor (SG73 series)
Features: The ability to withstand pulse voltage is 5 times higher than that of ordinary resistors and meets the AEC-Q200 standard.
Subdivision models: SG73P (pulse resistant), SG73S (surge resistant).
Automotive grade resistor series
ARK73 series (thick film automotive resistors)
Features: Passed AEC-Q200 certification, resistant to high temperature/high humidity/vibration.
ARN73 series (thin film automotive resistance)
Features: ± 0.1% accuracy, low noise, used for ADAS and battery management systems.
Miniature resistor series
RK73Z series (0201 ultra small)
Features: Size 0.6mm × 0.3mm, suitable for high-density PCB design.
RK73B-REEL series
Features: 0402/0603 ribbon packaging, suitable for automated surface mount production.
2、 Selection of power resistors for resistors
series
Model Example
Resistance density
characteristic
MCR series
MCR630
0.094 a/km
Dense structure, resistant to pulse loads
PWR series
PWR50
High power density
Winding design, excellent heat dissipation performance
Note: Dense power resistors (such as MCR630) achieve a resistance density of approximately 6% through optimized material and structural design, making them suitable for high voltage and high current scenarios such as industrial power supplies.
3、 Selection suggestions
Recommended series based on application scenarios:
High precision requirements: RN73H (thin film), RK73G (thick film).
Automotive Electronics: ARK73/ARN73 (Vehicle Regulation Certification).
Power circuit: MCR series (resistance density 6%), PWR series.
Miniature design: RK73Z (0201 size).
Anti sulfurization/surge: RK73B (anti sulfurization), SG73S (anti surge).
KOA resistors cover all scenario requirements with high reliability and diversified technology routes:
Precision control relies on the ultra-low temperature drift of the RN73/RK73G series;
High density and pulse resistance of MCR/PWR series are preferred for power scenarios;
ARK73/ARN73 certified models are mandatory for vehicle grade design.
When selecting, it is necessary to comprehensively evaluate the resistance, accuracy, temperature coefficient, packaging, and certification requirements, and verify the parameters by referring to official technical documents.
