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Type USF Ultra-Stable Low TC Film Resistors

200 Series and 300 Series

Zero Nominal TC — Maximum Absolute TC to 2 ppm/°C, -40°C to +85°C ref. to +25°C

Absolute Tol. to ±0.01%, Resistance Range 50 Ohm to 25 Megohm, Voltage Ratings up to 2500 Volts

The USF Ultra-Stable Low TC Ultra-Precision Film Resistors were

developed to meet the requirements for increasing performance for

resistors in high performance analog electronics. Utilizing Caddock

proprietary resistance ?lm systems, the Type USF resistors provide

the Lowest TC with the Widest Resistance Range and the Highest

Voltage Ratings available in the industry.

? Resistance Range 50 ohm to 25 Megohm.

? Temperature Coef?cient -40°C to +85°C, referenced to +25°C

200 Series — ZERO Nominal TC — Maximum Absolute TC 2 ppm/°C

300 Series — ZERO Nominal TC — Maximum Absolute TC 5 ppm/°C

? Tolerance: ±0.01% or ±0.10%.

? Speci?c standard resistance values are available that are most

commonly required in high accuracy analog design. These values

were selected and optimized for produceability and performance.

? 300 Series “matched pairs” are available with ratio TC as tight as

0.5 ppm/°C. Contact Applications Engineering.

? Ceramic package provides cool operation.

Type USF Ultra-Stable Resistors are offered in standard resistance values

that are most commonly used in precision analog design. These standard

resistance values can be used in precise ampli?er gain setting, precise

resistor bridge circuits, precise transducer sense circuits, and precise

voltage dividers with up to 2500 volt input voltage.

Extremely Low Power Coef?cient (Wattage Coef?cient): Type USF

resistors are constructed with an aluminum oxide ceramic sandwich

which provides great thermal conductivity. The ceramic sandwich

package very effectively minimizes the power coef?cient drift. Power

coef?cient is the resistance drift due to temperature rise in the element

caused by the power (wattage) dissipation in the resistor where the self-

heating temperature rise of the resistor element results in TC drift (temp.

rise in °C, times the temperature coef?cient of the resistor). In the USF

package, heat is pulled away from the resistance material ef?ciently by

this ceramic sandwich package construction. Plastic molded Low TC foil

resistors cannot provide this outstanding bene?t since the plastic impedes

the ?ow of heat, causing greater temperature rise at the resistor element

and greater self-heating related resistance drift due to power dissipation.

The USF 200 Series resistors provide a new level of performance with

near ZERO TC, very low power coef?cient, wide resistance range, and

higher voltage ratings than is offered by other resistor technologies.

Type USF 200 Series Ultra-Stable Resistors

? Constructed with two selected USF 300 Series

Resistors bonded back to back to achieve

outstanding low Absolute Temperature Coef?cient

performance. The resistors are to be connected in

parallel on the circuit board.

? ZERO Nominal TC — Max. Absolute TC: 2 ppm/°C,

-40°C to +85°C, referenced to +25°C

Type USF 300 Series Ultra-Stable Resistors

? ZERO Nominal TC — Max. Absolute TC: 5 ppm/°C,

-40°C to +85°C, referenced to +25°C

Model Number

Wattage

@ +85 ° C

Maximum

Continuous

Oper. Voltage

Resistance

Min.

Max.

Temperature

Coefficient

Fig.

Dimensions inches (mm)

B C

USF240

USF270

USF271

USF340

USF370

USF371

0.33

0.75

0.33

0.75

300

1,400

2,500

300

1,400

2,500

50 ?

990 K

9.9 Meg

50 ?

990 K

19.8 Meg

10 Meg

5 Meg

10 Meg

20 Meg

10 Meg

25 Meg

2 ppm/ ° C

5 ppm/ ° C

.750 ± .020

(19.05 ± .51)

1.500 ± .020

(38.10 ± .51)

1.500 ± .020

(38.10 ± .51)

.750 ± .020

(19.05 ± .51)

1.500 ± .020

(38.10 ± .51)

1.500 ± .020

(38.10 ± .51)

.375 ± .020

(9.53 ± .51)

.500 ± .020

(12.70 ± .51)

.500 ± .020

(12.70 ± .51)

.375 ± .020

(9.53 ± .51)

.500 ± .020

(12.70 ± .51)

.500 ± .020

(12.70 ± .51)

.425 Max.

(10.8 Max.)

.550 Max.

(13.97 Max.)

.550 Max.

(13.97 Max.)

.395 Max.

(10.03 Max.)

.520 Max.

(13.21 Max.)

.520 Max.

(13.21 Max.)

.600 ± .020

(15.24 ± .51)

1.350 ± .020

(34.29 ± .51)

1.350 ± .020

(34.29 ± .51)

.600 ± .020

(15.24 ± .51)

1.350 ± .020

(34.29 ± .51)

1.350 ± .020

(34.29 ± .51)

Applications Engineering

17271 North Umpqua Hwy.

Roseburg, Oregon 97470-9422

Phone: (541) 496-0700

Fax: (541) 496-0408

? 2004 Caddock Electronics, Inc.

e-mail: DOCK

CAD caddock@caddock.com ? web: www.caddock.com

For Caddock Distributors listed by country see caddock.com/contact/dist.html

Sales and Corporate Of?ce

1717 Chicago Avenue

Riverside, California 92507-2364

Phone: (951) 788-1700

Fax: (951) 369-1151

28_IL134.1004

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