KOA delivers reliable and innovative resistor technologies for a wide range of applications

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

• Automotive, aerospace, and industrial applications
• High-power circuits and sensors
• EV quick charging systems

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

• Current sensing in industrial devices
• High-performance applications with limited space
• Medical and aerospace electronics

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

• Automotive electronics (ECUs, powertrain, etc.)
• Industrial, medical, or aerospace electronics
• Voltage dividers for power supply monitoring

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

• 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

• 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