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USF300 Series Film Resistors


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


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

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

Digi-Key P/NManufacturer P/NResistancePowerDatasheet
USF340-10.0K-T-5PPM-ND USF340-10.0K-0.01%-5PPM 10.0KΩ 0.333W Datasheet
USF340-100K-T-5PPM-ND USF340-100K-0.01%-5PPM 100KΩ 0.333W Datasheet
USF340-10.0M-T-5PPM-ND USF340-10.0M-0.01%-5PPM 10.0MΩ 0.333W Datasheet
USF340-1.00M-T-5PPM-ND USF340-1.00M-0.01%-5PPM 1.00MΩ 0.333W Datasheet
USF370-1.00M-T-5PPM-ND USF370-1.00M-0.01%-5PPM 1.00MΩ 0.75W Datasheet
USF370-2.00M-T-5PPM-ND USF370-2.00M-0.01%-5PPM 2.00MΩ 0.75W Datasheet
USF370-5.00M-T-5PPM-ND USF370-5.00M-0.01%-5PPM 5.00MΩ 0.75W Datasheet
USF370-9.90M-T-5PPM-ND USF370-9.90M-0.01%-5PPM 9.90MΩ 0.75W Datasheet
USF370-9.99M-T-5PPM-ND USF370-9.99M-0.01%-5PPM 9.99MΩ 0.75W Datasheet
USF370-10.0M-T-5PPM-ND USF370-10.0M-0.01%-5PPM 10.0MΩ 0.75W Datasheet
USF371-20.0M-T-5PPM-ND USF371-20.0M-0.01%-5PPM 20MΩ 0.75W Datasheet