Vishay – Power Metal Strip® Resistor Handles Up to 0.5W in Space-Saving 1206 Case Size

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The new surface mount Power Metal Strip current sense resistor is in a compact 1206 case size that combines an extended power rating to 0.5W with a Kelvin 4-terminal connection that reduces TCR down to 35ppm and enables tight tolerances down to 0.1% for increased measurement accuracy. To minimize excess power dissipation, the Vishay Dale WSK1206…18 High Power offers low resistance values down to 0.01Ω.

Offering twice the power of standard resistors in a 1206 footprint, the new device allows designers to save board space and reduce costs by utilizing fewer and smaller components. With its 4-terminal construction, the resistor reduces system errors while eliminating the need for system calibration during manufacturing as well as in the field to further reduce costs and improve end product performance.

The advanced construction of the WSK1206…18 High Power incorporates a solid metal nickel-chrome or manganese-copper resistive element with low TCR (<20ppm/°C). This results in a pulse-tolerant, tight-tolerance resistor in a 1206 package size that maintains the superior electrical characteristics of the Power Metal Strip construction.

The WSK1206…18 High Power is ideal for all types of current sensing, voltage division, and pulse applications in power management for cell phones; DC/DC converters for servers, VRMs for laptops, and Li-Ion battery safety and management; industrial instrumentation; and automotive electronic control such as engine, transmission, anti-lock brakes, audio, and climate controls.

Like all Power Metal Strip resistors, the device features an all-welded construction that contributes to its superior electrical performance. A proprietary processing technique produces extremely low resistance values ranging from 0.01Ω to 0.05Ω, with tight tolerances of 0.1%, 0.5%, and 1.0%. The WSK1206…18 High Power provides low thermal EMF (<3μV/°C) and a temperature range from -65°C to +170°C. The device is RoHS compliant, halogen-free, and Vishay Green.

Standard Electrical Specifications

Global ModelSizePower Rating P70° WResistance Value Range Ω: Tol. ± 0.1%Resistance Value Range Ω: Tol. ± 0.25%Resistance Value Range Ω: Tol. ± 0.5%Resistance Value Range Ω: Tol. ± 1.0%Weight (Typical) g/1000 pieces
WSK1206...1812060.50.04 to 0.050.02 to 0.050.01 to 0.050.01 to 0.0516

Technical Specifications
ParameterUnitResistor Characteristics
Component temperature coefficient (including terminal)1ppm/°C±35
Element TCR2ppm/°C<20
Operating temperature range°C-65°C to +170°C
Maximum working voltage3V(P x R)1/2

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Dimensions in inches (millimeters)

ModelLWHTAB
WSK1206...180.126 ± 0.010 (3.20 ± 0.254)0.063 ± 0.010 (1.60 ± 0.254)0.025 ± 0.010 (0.635 ± 0.254)0.020± 0.010 (0.508 ± 0.254)0.023 ± 0.010 (0.584 ± 0.254)0.018 ± 0.010 (0.457 ± 0.254)

Solder Pad Dimensions in inches (millimeters)
Modelabcdl
WSK1206...180.040 (1.01)0.070 (1.778)0.030 (0.762)0.01 (0.254)0.070 (1.778)

FEATURES

  • 4-terminal design
  • Ideal for all types of current sensing, voltage division and pulse applications
  • Proprietary processing technique produces extremely low resistance values
  • Durable with all-welded construction
  • Solid metal nickel-chrome or manganese-copper resistive element with low TCR (<20ppm/°C)
  • Low thermal EMF (<3μV/°C)

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