Riedon Inc.

300CypressAvenue

AlhambraCA91801

(626)284-9901

(626)284-1704

www.riedon.com

Page133

rev.03/2006A

0

20

40

60

80

100

120

25

50

85

100

115 130 145 155

Temperatureofthebackplate(°C)

PowerRatingNotes-

TheU-SeriesResistorsmustbeattachedtoasuitableheatsink.

Themaximuminternalresistortemperatureis155°C.

Tospecifyanappropriateheatsinkusethefollowingformula:

R

q

Where: R

q

R

q

T

T

P=PowerThroughResistor(W)

-800

-600

-400

-200

0

200

400

600

800

-50

-25

0

25

50

75

100

125

-5ppm/K

+5ppm/K

Nominal ∆R/R

NominalSpread

±2.3ppm/K

NominalSpread

±2.3ppm/K

Temperature(°C)

Derating

Temperature Coefficient

Dimensions

USS4-T220/UNS4-T220

PrecisionShuntResistors

Dimension

mm

tol.

(±mm)

inches

tol.

(±inches)

A

12.70

0.2

0.50

0.008

B

10.16

0.2

0.40

0.008

C

0.76

0.1

0.03

0.004

D

2.54

0.1

0.10

0.004

E

7.62

0.1

0.30

0.004

F

4.00

0.1

0.16

0.004

G

1.20

0.1

0.05

0.004

H

14.60

0.2

0.57

0.008

I

15.00

0.2

0.59

0.008

J

17.33

0.2

0.68

0.008

K

0.40

0.1

0.02

0.004

L

1.85

0.1

0.07

0.004

Dimension

mm

inches

A

12.10

0.476

B

11.16

0.439

C

18.33

0.722

D

7.62

0.300

E

2.54

0.100

F

1.76

0.069

G

3.20

0.126