WSR5 Series, Power Metal Strip®, SMD

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Like the WSR2 (2-W) and WSR3 (3-W), the new WSR5’s (5-W) high power capability in a compact package enables designers to shift away from leaded resistors to a surface mount solution, and thus to create smaller, lower cost, and/or higher performing end products. When used to replace through-hole current-sensing resistors, the WSR5 reduces manufacturing placement costs while allowing for total solder reflow assembly. Per device costs also are further reduced by the elimination of secondary operations such as lead forming and trimming.

A proprietary processing technique allows the WSR5 to offer extremely low resistance values ranging from 1 mΩ to 300 mΩ in a standard resistance tolerance of ± 1 %. A tolerance of ± 0.5 % is available for the resistance range of 10 mΩ to 300 mΩ. The WSR5's very low inductance values range from 0.5 nH to 5 nH, and the device's temperature coefficients are ± 110 ppm/°C for the 7.5–mΩ to 9.9–mΩ range and ± 75 ppm/°C for the 10–mΩ to 300–mΩ range. Low thermal EMF, a broad operating temperature range of –65°C to +275°C, and resistance to moisture, vibration, thermal and mechanical shock ensure reliable operation.


  • Molded high temperature encapsulation
  • Improved thermal management incorporated into design
  • Ideal for all types of current sensing, voltage division and pulse applications including switching and linear power supplies, instrumentation and power amplifiers
  • All welded construction
  • Solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (< 20 ppm/°C)
  • Solderable terminations
  • Excellent frequency response to 50 MHz
  • Low thermal EMF (< 3 μV/°C)
  • Compliant to RoHS directive 2002/95/EC
  • Integral heat sink not utilized for resistance values less than 0.0075 Ω


  • Electronic controls in automotive systems
  • Power Supplies for communication base stations
  • DC/DC Converters and VRMs in high-end workstations and servers