FRSM Series of Z-1 Foil Chip Resistors

By Vishay Foil Resistors (Division of Vishay Precision Group) 110

FRSM Series of Z-1 Foil Chip Resistors

The FRSM series is based on the new generation Z-1 technology of the Bulk Metal® Precision Foil resistor elements by Vishay Foil Resistors, which makes these resistors virtually insensitive to destabilizing factors. Their element, based on the new Z-1 foil is a solid alloy that displays the desirable bulk properties of its parent material; thus, it is inherently stable (remarkably improved load life stability of 25 ppm), noise-free and withstands ESD to 25 KV or more. The alloy is matched to the substrate and forms a single entity with balanced temperature characteristics for an unusually low and predictable TCR over a wide range from -55°C to more than 175°C. Resistance patterns are photo-etched to permit trimming of resistance values to very tight tolerances.


  • Temperature coefficient of resistance (TCR):
    • 0.05 ppm/°C typical (0°C to + 60°C)
    • 0.2 ppm/°C typical (- 55°C to + 125°C, + 25°C ref.)
  • Resistance tolerance: to ± 0.01%
  • Power coefficient "ΔR due to self heating":
    • 5 ppm at rated power
  • Power rating: to 750 mW at + 70°C
  • Resistance Range: 5 Ω to 125 kΩ
  • Electrostatic discharge (ESD) at least to 25 kV
  • Short time overload: 0.005 %
  • Rise time: 1 ns effectively no ringing
  • Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)
  • Voltage coefficient: 0.1 ppm/V
  • Non inductive: 0.08 µH