USF300 Series Film Resistors

Caddock's film resistors well suited for demanding precision analog electronics applications

Image of Caddock Electronics' USF300 Series Film ResistorsCaddock Electronics' USF300 series of film resistors provides a wide resistance range of 50 Ω to 25 MΩ. These resistors are available in three models: USF340 (300 V, 0.33 W), USF370 (1400 V, 0.75 W), and USF371 (2500 V, 0.75 W).

The USF300 series resistors are manufactured with an aluminum oxide (alumina) ceramic sandwich that offers exceptional thermal performance. The thermal conductivity of the alumina package provides good heat flow away from the resistor element, minimizing the temperature rise in the resistor. This is contrary to plastic molded low TC foil resistors, which cannot provide these thermal benefits.

General Specifications
  • Voltage ratings: 300 V to 2500 V at +85°C
  • Power ratings: 0.33 W to 0.75 W at +85°C
  • Temperature coefficient: maximum ±5ppm/°C, -40°C to +85°C, ref. to +25°C
  • Resistance values: 50 Ω to 25 MΩ
  • Tolerances: ±0.01% or ±0.10%
  • Load life stability: 2,000 hours at rated voltage/power at +85°C, %ΔR (+0.015% ±0.015%) maximum

USF Series

ImageManufacturer Part NumberDescriptionPart StatusResistance (Ohms)Available Quantity
USF340-1.00M-0.01%-5PPM datasheet linkRES 1M OHM 1/3W 0.01% RADIALUSF340-1.00M-0.01%-5PPMRES 1M OHM 1/3W 0.01% RADIALActive1M326 - Immediate
USF340-1.00M-0.01%-5PPM product page link
USF340-20.0M-0.01%-5PPM datasheet linkRES 20M OHM 1/3W 0.01% RADIALUSF340-20.0M-0.01%-5PPMRES 20M OHM 1/3W 0.01% RADIALActive20M120 - Immediate
USF340-20.0M-0.01%-5PPM product page link
USF340-10.0M-0.1%-5PPM datasheet linkRES 10M OHM 1/3W 0.1% RADIALUSF340-10.0M-0.1%-5PPMRES 10M OHM 1/3W 0.1% RADIALActive10M229 - Immediate
USF340-10.0M-0.1%-5PPM product page link
USF340-20.0M-0.1%-5PPM datasheet linkRES 20M OHM 1/3W 0.1% RADIALUSF340-20.0M-0.1%-5PPMRES 20M OHM 1/3W 0.1% RADIALActive20M182 - Immediate
USF340-20.0M-0.1%-5PPM product page link
USF340-5.00M-0.01%-5PPM datasheet linkRES 5M OHM 1/3W 0.01% RADIALUSF340-5.00M-0.01%-5PPMRES 5M OHM 1/3W 0.01% RADIALActive5M151 - Immediate
USF340-5.00M-0.01%-5PPM product page link
USF340-10.0M-0.01%-5PPM datasheet linkRES 10M OHM 1/3W 0.01% RADIALUSF340-10.0M-0.01%-5PPMRES 10M OHM 1/3W 0.01% RADIALActive10M109 - Immediate
USF340-10.0M-0.01%-5PPM product page link
USF371-25.0M-0.1%-5PPM datasheet linkRES 25M OHM 3/4W 0.1% RADIALUSF371-25.0M-0.1%-5PPMRES 25M OHM 3/4W 0.1% RADIALActive25M2391 - Immediate
USF371-25.0M-0.1%-5PPM product page link
USF370-2.00M-0.01%-5PPM datasheet linkRES 2M OHM 3/4W 0.01% RADIALUSF370-2.00M-0.01%-5PPMRES 2M OHM 3/4W 0.01% RADIALActive2M158 - Immediate
USF370-2.00M-0.01%-5PPM product page link
USF370-5.00M-0.01%-5PPM datasheet linkRES 5M OHM 3/4W 0.01% RADIALUSF370-5.00M-0.01%-5PPMRES 5M OHM 3/4W 0.01% RADIALActive5M102 - Immediate
USF370-5.00M-0.01%-5PPM product page link
USF370-9.99M-0.01%-5PPM datasheet linkRES 9.99M OHM 3/4W 0.01% RADIALUSF370-9.99M-0.01%-5PPMRES 9.99M OHM 3/4W 0.01% RADIALActive9.99M200 - Immediate
USF370-9.99M-0.01%-5PPM product page link
USF371-20.0M-0.01%-5PPM datasheet linkRES 20M OHM 3/4W 0.01% RADIALUSF371-20.0M-0.01%-5PPMRES 20M OHM 3/4W 0.01% RADIALActive20M268 - Immediate
USF371-20.0M-0.01%-5PPM product page link
USF340-50.0K-0.01%-5PPM datasheet linkRES 50K OHM 1/3W 0.01% RADIALUSF340-50.0K-0.01%-5PPMRES 50K OHM 1/3W 0.01% RADIALActive50k38 - Immediate
USF340-50.0K-0.01%-5PPM product page link
USF340-500K-0.01%-5PPM datasheet linkRES 500K OHM 1/3W 0.01% RADIALUSF340-500K-0.01%-5PPMRES 500K OHM 1/3W 0.01% RADIALActive500k54 - Immediate
USF340-500K-0.01%-5PPM product page link
USF370-1.00M-0.1%-5PPM datasheet linkRES 1M OHM 3/4W 0.1% RADIALUSF370-1.00M-0.1%-5PPMRES 1M OHM 3/4W 0.1% RADIALActive1M34 - Immediate
USF370-1.00M-0.1%-5PPM product page link
USF340-2.00M-0.01%-5PPM datasheet linkRES 2M OHM 1/3W 0.01% RADIALUSF340-2.00M-0.01%-5PPMRES 2M OHM 1/3W 0.01% RADIALActive2M33 - Immediate
USF340-2.00M-0.01%-5PPM product page link
USF370-10.0M-0.1%-5PPM datasheet linkRES 10M OHM 3/4W 0.1% RADIALUSF370-10.0M-0.1%-5PPMRES 10M OHM 3/4W 0.1% RADIALActive10M58 - Immediate
USF370-10.0M-0.1%-5PPM product page link
USF371-20.0M-0.1%-5PPM datasheet linkRES 20M OHM 3/4W 0.1% RADIALUSF371-20.0M-0.1%-5PPMRES 20M OHM 3/4W 0.1% RADIALActive20M47 - Immediate
USF371-20.0M-0.1%-5PPM product page link
USF370-1.00M-0.01%-5PPM datasheet linkRES 1M OHM 3/4W 0.01% RADIALUSF370-1.00M-0.01%-5PPMRES 1M OHM 3/4W 0.01% RADIALActive1M85 - Immediate
USF370-1.00M-0.01%-5PPM product page link
USF340-20.0K-0.1%-5PPM datasheet linkRES 20K OHM 1/3W 0.1% RADIALUSF340-20.0K-0.1%-5PPMRES 20K OHM 1/3W 0.1% RADIALActive20k84 - Immediate
USF340-20.0K-0.1%-5PPM product page link
USF340-20.0K-0.01%-5PPM datasheet linkRES 20K OHM 1/3W 0.01% RADIALUSF340-20.0K-0.01%-5PPMRES 20K OHM 1/3W 0.01% RADIALActive20k87 - Immediate
USF340-20.0K-0.01%-5PPM product page link
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Published: 2012-06-29