USF300 Ultra-Stable Low TC Film Resistors

Caddock USF300 Ultra-Stable Low TC Film Resistors were developed for high-performance analog electronics. Utilizing Caddock proprietary resistance film systems, the Type USF300 resistors provide the lowest TC with a wide resistance range and high voltage ratings.The 300 series boasts a resistance range of 50Ω to 25MΩ with temperature coefficients from -40°C to +85°C (referenced to +25°C), and Zero Nominal TC (maximum absolute TC 5ppm/°C). The resistors' tolerance is ±0.01% or ±0.10%. The USF resistors are constructed with an aluminum oxide ceramic sandwich that provides great thermal conductivity and minimizes the power coefficient drift.

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Qty. RoHS ECAD Model Series
Resistance
Power Rating
Tolerance
Temperature Coefficient
Minimum Operating Temperature
Maximum Operating Temperature
Voltage Rating
Length
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Packaging
Product
Type
Caddock Metal Film Resistors - Through Hole 100K ohm 0.01% 5ppm
Datasheet
175In Stock
Min.: 1
Mult.: 1

USF300 100 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
183In Stock
Min.: 1
Mult.: 1

USF300 20 MOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
124In Stock
Min.: 1
Mult.: 1

USF300 20 MOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
155In Stock
Min.: 1
Mult.: 1

USF300 500 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 5M ohm 0.01% 5ppm
Datasheet
67In Stock
Min.: 1
Mult.: 1

USF300 5 MOhms 750 mW (3/4 W) 0.01 % 5 PPM / C - 40 C + 85 C 1.4 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 20M ohm 0.01% 5ppm
Datasheet
37In Stock
Min.: 1
Mult.: 1

USF300 20 MOhms 750 mW (3/4 W) 0.01 % 5 PPM / C - 40 C + 85 C 2.5 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
200In Stock
100Expected 2026-09-09
Min.: 1
Mult.: 1

USF300 20 MOhms 750 mW (3/4 W) 0.1 % 5 PPM / C - 40 C + 85 C 2.5 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
345In Stock
Min.: 1
Mult.: 1

USF300 25 MOhms 750 mW (3/4 W) 0.1 % 5 PPM / C - 40 C + 85 C 2.5 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
50In Stock
Min.: 1
Mult.: 1

USF300 100 kOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 10K ohm 0.01% 5ppm
Datasheet
69In Stock
Min.: 1
Mult.: 1

USF300 10 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
2In Stock
50Expected 2027-01-04
Min.: 1
Mult.: 1

USF300 1 MOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
50In Stock
Min.: 1
Mult.: 1

USF300 20 kOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
11In Stock
Min.: 1
Mult.: 1

USF300 50 kOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
38In Stock
50Expected 2026-10-14
Min.: 1
Mult.: 1

USF300 5 MOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
30In Stock
Min.: 1
Mult.: 1

USF300 2 MOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
24In Stock
Min.: 1
Mult.: 1

USF300 20 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
24In Stock
50Expected 2027-01-04
Min.: 1
Mult.: 1

USF300 200 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
57In Stock
Min.: 1
Mult.: 1

USF300 5 MOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
46In Stock
Min.: 1
Mult.: 1

USF300 50 kOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 1M ohm 0.01% 5ppm
Datasheet
20In Stock
150On Order
Min.: 1
Mult.: 1

USF300 1 MOhms 750 mW (3/4 W) 0.01 % 5 PPM / C - 40 C + 85 C 1.4 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
2In Stock
50Expected 2026-09-23
Min.: 1
Mult.: 1

USF300 1 MOhms 750 mW (3/4 W) 0.1 % 5 PPM / C - 40 C + 85 C 1.4 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 10M ohm 0.01% 5ppm
Datasheet
348Expected 2026-11-23
Min.: 1
Mult.: 1

USF300 10 MOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
450On Order
Min.: 1
Mult.: 1

USF300 10 MOhms 330 mW (1/3 W) 0.1 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole 1M ohm 0.01% 5ppm
Datasheet
248On Order
Min.: 1
Mult.: 1

USF300 1 MOhms 330 mW (1/3 W) 0.01 % 5 PPM / C - 40 C + 85 C 300 V 19.05 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC
Caddock Metal Film Resistors - Through Hole
Datasheet
450On Order
Min.: 1
Mult.: 1

USF300 10 MOhms 750 mW (3/4 W) 0.1 % 5 PPM / C - 40 C + 85 C 1.4 kV 38.1 mm Radial Bulk Metal Film Precision Resistors Zero Nominal TC