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USF240 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Ultra-Stable Low TC Film Resistors | |||
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Type USF Ultra-Stable Low TC Film Resistors
200 Series and 300 Series
New
Zero Nominal TC â 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 ï¬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 Coefï¬cient -40°C to +85°C, referenced to +25°C
200 Series â ZERO Nominal TC â Maximum Absolute TC 2 ppm/°C
300 Series â ZERO Nominal TC â Maximum Absolute TC 5 ppm/°C
⢠Tolerance: ±0.01% or ±0.10%.
⢠Speciï¬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 âmatched pairsâ 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 ampliï¬er gain setting, precise
resistor bridge circuits, precise transducer sense circuits, and precise
voltage dividers with up to 2500 volt input voltage.
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 Coefï¬cient
performance. The resistors are to be connected in
parallel on the circuit board.
⢠ZERO Nominal TC â Max. Absolute TC: 2 ppm/°C,
-40°C to +85°C, referenced to +25°C
Extremely Low Power Coefï¬cient (Wattage Coefï¬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 coefï¬cient drift. Power
coefï¬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 coefï¬cient of the resistor). In the USF
package, heat is pulled away from the resistance material efï¬ciently by
this ceramic sandwich package construction. Plastic molded Low TC foil
resistors cannot provide this outstanding beneï¬t since the plastic impedes
the ï¬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 coefï¬cient, wide resistance range, and
higher voltage ratings than is offered by other resistor technologies.
Type USF 300 Series Ultra-Stable Resistors
⢠ZERO Nominal TC â Max. Absolute TC: 5 ppm/°C,
-40°C to +85°C, referenced to +25°C
Model Number
USF240
USF270
USF271
USF340
USF370
USF371
Wattage
@ +85°C
0.33
0.75
0.75
0.33
0.75
0.75
Maximum
Continuous
Oper. Voltage
300
1,400
2,500
300
1,400
2,500
Resistance
Min.
Max.
50 â¦
10 Meg
990 K
5 Meg
9.9 Meg
10 Meg
50 â¦
20 Meg
990 K
10 Meg
19.8 Meg
25 Meg
Temperature
Coefficient
Fig.
A
2 ppm/°C
1
.750 ±.020
(19.05 ±.51)
2 ppm/°C
2 ppm/°C
1
1.500 ±.020
(38.10 ±.51)
1
1.500 ±.020
(38.10 ±.51)
5 ppm/°C
2
.750 ±.020
(19.05 ±.51)
5 ppm/°C
5 ppm/°C
2
1.500 ±.020
(38.10 ±.51)
2
1.500 ±.020
(38.10 ±.51)
Dimensions inches (mm)
B
C
.375 ±.020
(9.53 ±.51)
.425 Max.
(10.8 Max.)
.500 ±.020
(12.70 ±.51)
.500 ±.020
(12.70 ±.51)
.550 Max.
(13.97 Max.)
.550 Max.
(13.97 Max.)
.375 ±.020
(9.53 ±.51)
.395 Max.
(10.03 Max.)
.500 ±.020
(12.70 ±.51)
.500 ±.020
(12.70 ±.51)
.520 Max.
(13.21 Max.)
.520 Max.
(13.21 Max.)
D
.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.
CADDOCK
e-mail: caddock@caddock.com ⢠web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Ofï¬ce
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL134.1004
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