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Type USF Ultra-Stable Low TC Film Resistors
200 Series and 300 Series
New
Zero Nominal TC — MaximumAbsolute 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 film 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 Coefficient -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%.
Specific 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.
Type USF 200 Series Ultra-Stable Resistors
•
300 Series “matched pairs” are available with ratio TC as tight as
0.5 ppm/°C. Contact Applications Engineering.
•
Constructed with two selected USF 300 Series
Resistors bonded back to back to achieve
outstanding low Absolute Temperature Coefficient
performance. The resistors are to be connected in
parallel on the circuit board.
•
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 amplifier gain setting, precise
resistor bridge circuits, precise transducer sense circuits, and precise
voltage dividers with up to 2500 volt input voltage.
•
ZERO Nominal TC — Max.Absolute TC: 2 ppm/°C,
-40°C to +85°C, referenced to +25°C
Extremely Low Power Coefficient (Wattage Coefficient): 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 coefficient drift. Power
coefficient 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 coefficient of the resistor). In the USF
package, heat is pulled away from the resistance material efficiently by
this ceramic sandwich package construction. Plastic molded Low TC foil
resistors cannot provide this outstanding benefit since the plastic impedes
the flow 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 coefficient, wide resistance range, and
higher voltage ratings than is offered by other resistor technologies.
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
Maximum
Continuous
Oper. Voltage
Resistance
Min.
Dimensions inches (mm)
Fig.
Wattage
Temperature
Coefficient
Model Number
@
+85°C
A
D
Max.
B
C
.750 ±.020
.375 ±.020
(9.53 ±.51)
.425 Max.
(10.8 Max.)
.600 ±.020
1
USF240
50 Ω
0.33
300
2 ppm/°C
2 ppm/°C
2 ppm/°C
10 Meg
(19.05 ±.51)
(15.24 ±.51)
1.500 ±.020
(38.10 ±.51)
.500 ±.020
.550 Max.
(13.97 Max.)
1.350 ±.020
1
1
USF270
USF271
0.75
0.75
1,400
2,500
5 Meg
10 Meg
20 Meg
10 Meg
25 Meg
990 K
(12.70 ±.51)
(34.29 ±.51)
1.500 ±.020
.500 ±.020
.550 Max.
(13.97 Max.)
1.350 ±.020
(34.29 ±.51)
9.9 Meg
(38.10 ±.51)
(12.70 ±.51)
.395 Max.
10.03 Max.
.600 ±.020
.750 ±.020
.375 ±.020
(9.53 ±.51)
2
USF340
USF370
USF371
0.33
0.75
0.75
300
50 Ω
5
ppm/°C
(
)
)
(15.24 ±.51)
(19.05 ±.51)
.500 ±.020
.520 Max.
13.21 Max.
1.350 ±.020
(34.29 ±.51)
1.500 ±.020
(38.10 ±.51)
5
5
ppm/°C
ppm/°C
1,400
2,500
2
2
990 K
(12.70 ±.51)
(
(
.500 ±.020
.520 Max.
13.21 Max.
1.350 ±.020
1.500 ±.020
19.8 Meg
(12.70 ±.51)
)
(34.29 ±.51)
(38.10 ±.51)
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (541) 496-0408
Fax: (951) 369-1151
© 2004 Caddock Electronics, Inc.
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