Film Resistors suit analog electronics applications.

Press Release Summary:




Manufactured with alumina ceramic sandwich, Models USF340, USF370, and USF371 provide voltage ratings of 300, 1,400, and 2,500 V and power ratings of 0.33, 0.75, and 0.75 W, respectively. Units feature resistance range of 50 ohms to 25 Megohms with temperature coefficient of ±5 ppm/°C max from -40 to +85°C. Applications include amplifier gain setting, bridge circuits, weighing systems, strain gage circuits, reference resistors, and precision voltage dividers.



Original Press Release:



Introducing Caddock's USF300 Series



Ultra-Stable, Low TC, Ultra-Precision Film Resistors
Lower Cost, Standard Values: from 50 Ohm to 25 Megohm
Tolerance: 0.10% or 0.01%, TC: 5 ppm/°C (max.), -40°C to +85°C, ref. +25°C

Caddock Electronics is pleased to announce the USF300 Series of Ultra-Stable, Low TC, Ultra-Precision Film Resistors developed for use in the most demanding Precision Analog Electronics Applications. The USF300 Series provides the widest resistance range, 50 Ohm to 25 Megohm, for a Low TC resistor product available in the industry, 5 ppm/°C, max., -40°C to +85°C, ref. +25°C. The USF300 Series is available in three models with (voltage and power ratings): USF340 (300V, 0.33W), USF370 (1400V, 0.75W), USF371 (2500V, 0.75W).

For Ultra-Low TC Caddock offers the USF200 Series with a TC of 2 ppm/°C, max., -40°C to +85°C, ref. +25°C. See the data sheet at www.caddock.com

The USF300 Series resistors are manufactured with an alumina (aluminum oxide) ceramic sandwich that offers exceptional thermal performance. The excellent thermal conductivity of the alumina sandwich construction provides good heat flow away from the resistor element minimizing the temperature rise in the resistor due to power dissipation as compared to "plastic package" Low TC resistors. This provides extremely stable operating performance as power is applied to the Low TC resistor.

The Load Life Stability of the USF300 Series:
2,000 Hours at Full Rated Voltage/Power at +85°C, %∆R (+0.015% ±0.015%) max.
10,000 Hours at Full Rated Voltage/Power at +85°C, %∆R (+0.030% ±0.030%) max.

USF300 Series resistors are available in standard resistance values that are used in high accuracy, precision analog designs. Typical applications include Amplifier Gain Setting, Bridge Circuits, Weighing Systems, Strain Gage Circuits, Reference Resistors, and Precision Voltage Dividers with input voltages up to 2500 V.

Custom Products based on the USF300 Series include:
o Matched Resistor Pairs and Sets with Ratio TC as tight as 0.5 ppm/°C for equal resistance values.

General Specifications for the USF300 Series:
o Voltage Ratings: 3 Models with Voltage Ratings from 300 Volts to 2500 Volts at +85°C
o Power Ratings: 3 Models with Power Ratings from 0.33 Watt to 0.75 Watt at +85°C
o Temp. Coefficient: Max. TC ±5ppm/°C from -40°C to +85°C ref. to +25°C
o Resistance Values: Standard Values offered from 50 Ohm to 25 Megohm
o Tolerances: Standard Tolerances of ±0.01% or ±0.10%
o Loadlife Stability: 2,000 hours at rated voltage/power at +85°C, %∆R: (+0.015% ±0.015%), max.
o Availability: Available now with Lead Times: Stock (Engineering Samples) to 8 weeks ARO

Reader (Inquiry) Contact: Caddock Electronics, Inc.; Applications Engineering Department, 17271 North Umpqua Highway, Roseburg, Oregon 97470-9422 Tel.: 541-496-0700; Fax: 541-496-0408; Email: caddock@caddock.com; Web: www.caddock.com

Editorial Contact: Dave Anderson, Senior Applications Engineer
Tel.: 541-496-0700; Fax: 541-496-0408; Email: dave.anderson@caddock.com

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