Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
© 2004 Caddock Electronics, Inc.
CAD
K
DOC
A
B
.50 ±.125
(12.70 ±3.18)
.032 DIA.
(.81 DIA.)
.200 ±.020
(5.08 ±.51)
C
(seated height)
D
.160 ±.030
(4.06 ±.76)
USF 200 Series Circuit Board Connection Note: The Type USF 200
Series Resistor must have the two “bonded” resistors in the package connected
in parallel on the circuit board as shown. This parallel connection of the two
resistors achieves the specified resistance with the specified performance.
Circuit Board Trace
Circuit Board Trace
Front View
Side View
Top View
Dimensions in inches
and (millimeters)
Fig. 1
USF 200 Series
CADDOCK
USF240
0418
.50 ±.125
(12.70 ±3.18)
.032 DIA.
(.81 DIA.)
.075 ±.020
(1.91 ±.51)
A
B
C
(seated height)
D
Side View
Front View
Fig. 2
USF 300 Series
Dimensions in inches
and (millimeters)
CADDOCK
USF340
0412
Ordering Information USF300 Series:
Ordering Information USF200 Series:
USF370 - 990K - 0.10% - 5 ppm/°C
Model Number
Resistor Value
Tolerance
(0.01% or 0.10%)
USF240 - 10.0 Meg - 0.01% - 2 ppm/°C
Model Number
Resistor Value
Tolerance
(0.01% or 0.10%)
50.0 Ω
100 Ω
200 Ω
250 Ω
350 Ω
500 Ω
900 Ω
1.00 K
2.00 K
2.50 K
5.00 K
9.00 K
10.0 K
20.0 K
25.0 K
50.0 K
USF240 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C
90.0 K
99.0 K
100 K
200 K
USF270 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C
Standard Resistance Values:
Specifications:
Resistance Tolerance: ±0.01% or ±0.10 measured at +23°C ±2°C.
Absolute Temperature Coefficient: TC referenced to +25°C,
Δ
R taken at -40°C and +85°C.
Load Life Stability: 2,000 hours at +85°C at rated voltage, not to
exceed rated power, ΔR (+0.015 ±0.015)% max.
10,000 hours at +85°C at rated voltage, not to exceed rated
power, ΔR (+0.030 ±0.030)% max.
Thermal Shock: Mil-Std-202 Method 107 condition A, except min.
temp. is -40°C, ΔR ±0.01% maximum.
Voltage Coefficient: USF270 at 5 Meg, and USF271, USF370,
USF371 at resistances of 9 Meg or greater, 0.02 ppm/volt
maximum.
Shelf Life Stability: Typical +(20ppm ±20ppm)/yr. after 1 year.
Extended shelf life (ten years) 10ppm/year maximum.
Operating Temperature: -40°C to +85°C.
Leadwire: Solder Coated Copper.
Other Low TC Resistor Products from Caddock:
• Type TF Low TC Ultra-Precision Film Resistors (1K to 125Meg)
• Type TN Lab Grade Low TC Precision Film Resistors
• Type TK Low TC Precision Radial-Lead Film Resistors
• Type TG Low TC Precision High Voltage Resistors (up to 30KV)
• T912 and T914 Low TC Ultra-Precision Resistor Networks
• Type USVD Ultra-Stable Voltage Dividers (up to 2500V)
• Type THV Precision High Voltage Dividers (up to 20KV)
250 K
500 K
1.00 Meg
2.00 Meg
2.50 Meg
5.00 Meg
9.90 Meg
9.99 Meg
10.0 Meg
Custom USF 200 Series and 300 Series Resistors:
USF 200 Series and 300 Series Resistors are available, for high
quantity applications, with custom performance:
• In the 200 Series, Absolute TC to as tight as 1ppm/°C is available
for certain resistances.
• Matched Ratio TC to as tight as 0.5ppm/°C for equal resistances.
• Matched Ratio TC can be provided in the 200 Series style “bonded”
Resistor pairs.
990 K
USF271 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C
9.90 Meg
1.00 Meg 2.00 Meg
9.99 Meg 10.0 Meg
USF340 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C
USF370 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C
USF371 Standard Resistance Values:
Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C
50.0 Ω
100 Ω
200 Ω
350 Ω
400 Ω
500 Ω
700 Ω
1.00 K
1.80 K
2.00 K
4.00 K
5.00 K
10.0 K
18.0 K
20.0 K
40.0 K
50.0 K
90.0 K
99.0 K
100 K
180 K
198 K
200 K
400 K
990 K
1.00 Meg
1.98 Meg
2.00 Meg
19.8 Meg
500 K
990 K
999 K
1.00 Meg
2.00 Meg
4.00 Meg
5.00 Meg
9.90 Meg
9.99 Meg
10.0 Meg
19.8 Meg
19.98 Meg
20.0 Meg
4.00 Meg
5.00 Meg
9.90 Meg
9.99 Meg
19.98 Meg 20.0 Meg
10.0 Meg
5.00 Meg
25.0 Meg
Type USF Ultra-Stable Low TC Film Resistors
200 Series and 300 Series
Page 2 of 2
28_IL134.1004
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