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Type USF Ultra-Stable Low TC Film Resistors

200 Series and 300 Series

Page 2 of 2

Standard Resistance Values:

USF240 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C

50.0 Ω 350 Ω 2.00 K 10.0 K 90.0 K 250 K 2.50 Meg 10.0 Meg

100 Ω 500 Ω 2.50 K 20.0 K 99.0 K 500 K 5.00 Meg

200 Ω 900 Ω 5.00 K 25.0 K 100 K 1.00 Meg 9.90 Meg

250 Ω 1.00 K 9.00 K 50.0 K 200 K 2.00 Meg 9.99 Meg

Top View

Fig. 1

USF 200 Series

Dimensions in inches

and (millimeters)

.160 ± .030

(4.06 ± .76)

USF270 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C

990 K 1.00 Meg 2.00 Meg 5.00 Meg

Front View

CADDOCK

USF240

0418

(seated height)

USF271 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 2ppm/°C

9.90 Meg 9.99 Meg 10.0 Meg

USF340 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C

50.0 Ω 400 Ω 1.80 K 10.0 K 50.0 K 180 K 500 K 2.00 Meg

100 Ω 500 Ω 2.00 K 18.0 K 90.0 K 198 K 990 K 4.00 Meg

200 Ω 700 Ω 4.00 K 20.0 K 99.0 K 200 K 999 K 5.00 Meg

350 Ω 1.00 K 5.00 K 40.0 K 100 K 400 K 1.00 Meg 9.90 Meg

USF370 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C

990 K 1.98 Meg 4.00 Meg 9.90 Meg 10.0 Meg

1.00 Meg 2.00 Meg 5.00 Meg 9.99 Meg

9.99 Meg

10.0 Meg

19.8 Meg

19.98 Meg

20.0 Meg

.032 DIA. .50 ± .125

(.81 DIA.) (12.70 ± 3.18)

Side View

D .200 ± .020

(5.08 ± .51)

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.

USF371 Standard Resistance Values:

Absolute Tolerance: ±0.01% or ±0.10%, Absolute TC: 5ppm/°C

19.8 Meg 19.98 Meg 20.0 Meg 25.0 Meg

Speci?cations:

Resistance Tolerance: ±0.01% or ±0.10 measured at +23°C ±2°C.

Absolute Temperature Coef?cient: TC referenced to +25°C,

Δ R taken at -40°C and +85°C.

Circuit Board Trace

Fig. 2

USF 300 Series

Circuit Board Trace

.075 ± .020

(1.91 ± .51)

Load Life Stability: 2,000 hours at +85°C at rated voltage, not to

exceed rated power, Δ R (+0.015 ±0.015)% max.

10,000 hours at +85°C at rated voltage, not to exceed rated

power, Δ R (+0.030 ±0.030)% max.

Thermal Shock: Mil-Std-202 Method 107 condition A, except min.

temp. is -40°C, Δ R ±0.01% maximum.

Voltage Coef?cient: USF270 at 5 Meg, and USF271, USF370,

USF371 at resistances of 9 Meg or greater, 0.02 ppm/volt

maximum.

Front View

.032 DIA.

(.81 DIA.)

CADDOCK

USF340

0412

.50 ± .125

(12.70 ± 3.18)

(seated height)

Side View

Dimensions in inches

and (millimeters)

Resistor Value

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.

Ordering Information USF200 Series:

USF240 - 10.0 Meg - 0.01% - 2 ppm/ ° C

Model Number Tolerance

(0.01% or 0.10%)

Ordering Information USF300 Series:

USF370 - 990K - 0.10% - 5 ppm/ ° C

Model Number Tolerance

(0.01% or 0.10%)

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.

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)

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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