KOA delivers reliable and innovative resistor technologies for a wide range of applications
KOA provides a comprehensive range of reliable resistor technologies designed to meet the demands of automotive, industrial, medical, and aerospace applications. The portfolio includes high precision, high power, and current sensing solutions that ensure robust performance even under challenging operating conditions.
WK73 – Space saving wide terminal chip resistors
KOA’s WK73 series offers an excellent power-to-size ratio due to improved heat dissipation via the solder joints and enhanced solder junction reliability. These resistors are ideal for applications where limited space and high performance are required.
Features & benefits
- Higher rated power – less board space
- Excellent heat dissipation
- Low thermal expansion stress
Applications
- Automotive electronics (ECUs, powertrain, etc.)
- EV charging stations, DC high-power EV chargers
- Power supplies, motor control units, etc.
WK73
WG73 – Pulse power tolerant wide terminal chip resistors
KOA’s WG73 series of wide terminal resistors provides several advantages over standard footprints. The 0612 chip size allows for 4× the power rating compared to standard 1206 parts. Enhanced heat dissipation via solder joints helps save board space, while the improved pulse handling capability makes this resistor ideal for high-power applications.
Features & benefits
- Outstanding pulse & surge proof properties
- 10 kW / 10 µs single pulse power (1225 size)
- 10% or 20% tolerance
- Resistance range: 560 mΩ to 1 kΩ
- Sizes: 0612, 1020, 1225
- Operating temperature: −55…+155 °C
- EU-RoHS compliant
- AEC-Q200 tested
Applications
- Automotive, aerospace, and industrial applications
- High-power circuits and sensors
- EV quick charging systems
WG73
WU73 – Wide terminal low ohmic thick film chip resistors
KOA’s WU73 series features a 90° rotated design, offering benefits like lower temperature rise and PCB space saving. The 1.5 W power rating is more than double that of a standard 1206 part with short-side terminations. Enhanced heat dissipation and increased terminal strength make these resistors perfect for high-performance applications.
Features & benefits
- Excellent heat dissipation characteristics
- Resistance range: 10 mΩ to 100 mΩ
- TCR: 75 or 100 ppm/°C
- Current sense range: 0 – 12.2 A
- Power rating: 1 W to 1.5 W
- Size: 0612
- 1% standard tolerance
- Operating temperature: −55…+155 °C
- EU-RoHS compliant
- AEC-Q200 tested
Applications
- Current sensing in industrial devices
- High-performance applications with limited space
- Medical and aerospace electronics
WU73
WN73H – High Precision Power Resistors
KOA’s WN73H high-power thin-film resistors are designed for high-reliability applications in demanding environments. They offer an excellent power-to-size ratio and are particularly suitable for automotive applications.
Features & benefits
- High precision & high power – less board space
- Tolerance to ±0.5%
- TCR: 10 to 50 ppm/K
- Sizes/power: 0306 (0.3 W), 0612 (1 W)
- Excellent heat dissipation
- High moisture resistance
Applications
- Automotive electronics (ECUs, powertrain, etc.)
- Industrial, medical, or aerospace electronics
- Voltage dividers for power supply monitoring
WU73
BGRV / BSRV / BWRV – High power resistors
The BGRV, BWRV, and BSRV series from KOA are designed to withstand the high inrush currents typically encountered in electric vehicle pre-charge and discharge circuits. These high-power resistors ensure reliable operation even under repetitive surges and demanding industrial conditions. Available with spade/lug terminals, they can be integrated into wiring harnesses or connector blocks for flexible deployment. All series are AEC-Q200 tested and EU-RoHS compliant.
Features & benefits
- Excellent inrush current handling
- Improved resistance tolerance and temperature coefficient
- Excellent overload performance
- Optional quick-connect terminals
- Flame-retardant ceramic case
- Resistance range: 1 Ω to 75 kΩ (±5%, ±10%)
- Power rating: 3 W to 60 W
- Operating temperature: −40…+155 °C
- Tested to AEC-Q200 requirements
- EU-RoHS compliant
Series differentiation
- BGR(V) wirewound: withstands high inrush currents in EV pre-charge circuits
- BWR(V) wirewound: lower resistance values, improved TCR, tight tolerances
- BSR(V) metal oxide: designed for capacitor discharge function in EV circuits
Applications
- Battery unit / inverter circuits for automotive electronics (HEV, EV, PHEV, FCV)
- EV pre-charge circuits (BGRV, BWRV)
- EV discharge circuits (BSRV)
- On-board chargers
- Industrial converters / inverters
HPC / PCF – High energy pulse withstand resistors
KOA’s ceramic HPC and PCF resistors feature a solid ceramic body, making them highly durable and capable of absorbing high pulse currents and voltages. These resistors are ideal for high-voltage applications and power surge protection.
Features & benefits
- Solid ceramic body ideal for high-voltage circuits and surge currents
- Non-inductive design for minimal interference
- Pulse voltage up to 25 kV
- Power rating: ½–5 W
- Operating temperature: −40…+200 °C
- AEC-Q200 tested
- EU-RoHS compliant
- PCF: flame-retardant coating (UL94 V-0 equivalent)
Applications
- High-voltage circuits
- Medical high-voltage products
- Power supplies
- Inrush current limiting
- Snubber circuits
- High-voltage dividers
- X-ray generators
- Electron beam microscopes
- Replacement for solid carbon resistors
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