General catalogue - Caddock Electronics - #37

Page 2 of 2

Type USF Ultra-Stable Low TC Film Resistors 200 Series and 300 Series

Standard Resistance Values: USF240 Standard Resistance Values:

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

50.0 Q 350 Q 2.00 K 10.0 K 90.0 K 250 K 2.50 Meg 10.0 Meg 100 Q 500 Q 2.50 K 20.0 K 99.0 K 500 K 5.00 Meg

200 Q 900 Q 5.00 K 25.0 K 100 K 1.00 Meg 9.90 Meg 250 Q 1.00 K 9.00 K 50.0 K 200 K 2.00 Meg 9.99 Meg

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

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

Fig. 1 USF 200 Series

Top View

— .160 ±.030 (4.06 ±.76)

_L

C

A

T B

—È"

.50 ±.125 (12.70 ±3.18)

Front View

CADDOCK USF240 0418

.032 DIA. (.81 DIA.)

Side View

D

- .200 ±.020 (5.08 ±.51)

9.99 Meg 10.0 Meg 19.8 Meg 19.98 Meg 20.0 Meg

400 Q

500 Q

700 Q 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

500 K 990 K 999 K

1.00 Meg

2.00 Meg 4.00 Meg 5.00 Meg 9.90 Meg

50.0 Q 100 Q

200 Q

350 Q

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.

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

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

-n/VNA-

Circuit Board Trace

Circuit Board Trace

-o-

-aAAA-

-o-

Fig. 2 USF 300 Series

Specifications:

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

.075 ±.020 (1.91 ±.51)

TC referenced to +25°C,

A

AR taken at -40°C and +85°C.

Load Life Stability: 2,000 hours at +85°C at rated voltage, not to exceed rated power, AR (+0.015 ±0.015)% max. 10,000 hours at +85°C at rated voltage, not to exceed rated power, AR (+0.030 ±0.030)% max.

Thermal Shock: Mil-Std-202 Method 107 condition A, except min. temp. is -40°C, AR ±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.

Front View

C

B

CADDOCK USF340 0412

.032 DIA. (.81 DIA.)

.50 ±.125 (12.70 ±3.18) _i_

- D

Side View

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)

Ordering Information USF200 Series:

Tolerance (0.01% or 0.10%)

Model Number

Resistor Value

Ordering Information USF300 Series:

Model Number ^L

Resistor Value

Tolerance (0.01% or 0.10%)

17271 North Umpqua Hwy. Ihlf* ¹⁷¹⁷ Chicago Avenue

Roseburg, Oregon 97470-9422 ffWW- Riverside, California 92507-2364

Phone: (541) 496-0700 e-mail: caddock@caddock.com • web: www.caddock.com Phone: (951) 788-1700

Fax: (541) 496-0408 For Caddock Distributors listed by country see caddock.com/contact/dist.html Fax: (951) 369-1151

© 2004 Caddock Electronics, Inc.

28_IL134.1004