SMR1DZ/SMR3DZ Series Z-Foil Resistors Vishay Precision Group SMR1DZ/SMR3DZ Series Z-Foil Resistors are ultra high precision, molded surface mountable resistors that offer low TCR, tight tolerance, and long-term stability. The SMR1DZ/SMR3DZ Series resistors from Vishay Precision Group utilize ultra high precision Bulk Metal® Z-Foil technology that provides a significant reduction of the resistor's sensitivity to ambient temperature variations (TCR) and to self heating when power is applied (power coefficient). Features of SMR1DZ/SMR3DZ Series Resistors include resistance range of 5Ω to 80kΩ, tolerance to ±0.01%, flexible terminations, TCR down to ±0.05ppm/ºC, low noise, low thermal EMF, and load life stability of ±0.005% (50ppm).