Extended Power Chip Resistor Families PSx, TLR and WK73 from KOA

• – Power shunt resistors with ultra-low resistance suitable for large current sensing, as well as a broad operating temperature in the PSx series
• – Current sense shunts down to 0.5mΩ from TLR series as filletless SMD types with low height
• – New high-power options in its WK73R and WK73S resistor series with wide terminal construction

PSx2 Series: Metal Plate Power Shunts 244A, 3920 & 2512 inch

For high current applications, KOA has now expanded its existing Power Shunt series by adding the PSJ2 and the PSL2. The PSJ2 (3920 inch) resistor can measure currents up to 244 A (200 µOhm). Constructed using a solid metal alloy resistance element with copper terminations, the device provides superior corrosion and heat resistance and has excellent pulse resistance. The PSJ2 and the PSL2 have a very low profile with a thickness of between 0.84 mm and 1.98 mm.

Product Features

• – PSJ2: 244 A - 0.2 mΩ to 35 A - 4 mΩ
• – PSL2: 212 A - 0.2 mΩ to 126 A - 0.5 mΩ
• – Sizes: 3920 (PSJ2) and 2512 inch (PSL2)
• – 2 terminal configurations
• – Ultra-low resistance, suitable for large current detection
• – Excellent long-term stability and pulse withstanding performance
• – Robust copper terminations
• – EU-RoHS compliant, AEC-Q200 qualified

PSx4 Series: Metal Plate Power Shunts, 4 Terminal, 2725 & 1216 inch

Product Features

• – PSG4: 2725 inch, 141 A - 0.5 mΩ and 89 A - 1 mΩ
• – PSF4:  1216 inch, 100 A - 0.5 mΩ and 54 A - 1 mΩ
• – Kelvin terminal construction
• – ±50 ppm/K (+25 °C / +125 °C)
• – Ultra-low resistance, suitable for large current detection
• – Excellent long-term stability and pulse withstanding performance
• – Robust copper terminations
• – EU-RoHS compliant, AEC-Q200 qualified

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TLR Series: Current Sensing Resistors Metal Plate Technology

TLR metal plate current sensing resistors are now offered in the ultra-low resistance range 0.5mΩ…20mΩ and allow increased power ratings up to 5 W (2512) at +110°C terminal temperature. Special trimming gives the device low inductance as well as reduced 'hot spot ' power dissipation. The TLR series also has excellent pulse resistance and high-frequency characteristics.

Product Features

• – 0.5 mΩ to 20 mΩ
• – 1 W (0805 inch) to 5 W (2512 inch)
• – Current ratings up to 77 A
• – T.C.R.: ±50 / ±75 ppm/K
• – 0.6 ... 0.7mm low profile height
• – Special no ‘hotspot’ trimming for high rel.
• – Low parasitic inductance
• – 5 sizes from 0805 to 2512
• – Operating Temperatures up to +170 °C
• – EU-RoHS compliant, AEC-Q200 qualified
• – Filletless product (soldering area is only the bottom electrode)

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WK73 Series: High Power Wide Terminal Chip Resistors

High reliability and enhanced terminal strength are essential in all power applications. KOA’s wide terminal resistors offer several advantages compared to standard footprints. The 0612 chip size allows 6 x power rating compared to standard 1206 parts. This saves board space and is possible due to the improved heat dissipation via the solder joints. The large terminals also enhance terminal strength and the smaller distance between the terminals reduces expansion stress. Finally, the inner resistive pattern is designed to minimize hotspots. These benefits combine to deliver superior reliability compared to standard flat chip resistors.

Product Features

• – Excellent heat dissipation
• – Superior temperature and power cycling performance
• – Low thermal expansion stress
• – Higher rated power - less board space than standard chips
• – Standard sizes 0204, 0306, 0508, 0612, 1020, 1218 and 1225
• – Resistance range 10 mΩ … 1 MΩ
• – EU-RoHS compliant, AEC-Q200 qualified
• – Anti-sulfuration types also available (WK73S/R_RT)

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