Riedon Inc.

300 Cypress Avenue

Alhambra CA 91801

(626) 284-9901

(626) 284-1704

www.riedon.com

06/13

Foil Power Resistors

Temperature Coefficient

Derating and Stability

Dimensions and Attachment Variations

Power Rating Notes -

The FPR/FNR Series Foil Resistors must be attached to a suit-

able heatsink. The maximum internal resistor temperature is

130°C for a 0.5% stability part.

To specify an appropriate heatsink use the following formula :

R

P

Where: R

R

T

T

P = Power Through Resistor ( W )

FPR/FNR 2-T227

FPR/FNR 4-T227

Dimension

mm

tol.

(±mm)

inches

tol.

(±inches)

A

26

0.5

1.02

0.020

B

38

0.5

1.50

0.020

C

12.7

0.2

0.50

0.008

D

4

0.2

0.16

0.008

E

30

0.2

1.18

0.008

F

15

0.2

0.59

0.008

G

4.1

0.2

0.16

0.008

H

10

0.2

0.39

0.008

I

8

0.2

0.31

0.008

J

4

0.2

0.16

0.008

K

2

0.2

0.08

0.008

L

0.8

0.1

0.03

0.004

M

M4

M4

N

10

0.2

0.39

0.008

O

11.9

0.2

0.47

0.008

0

20

40

60

80

100

120

25

50

85

100

115

130

Temperature of the backplate (°C)

0.1%

0.2%

0.5%

-15ppm/°C

+15ppm/°C

Nominal ∆R/R

Limit 2 (3σ)

Limit 1 (3σ)

Temperature (°C)

4000

2000

0

-2000

-4000

-6000

-8000

-20

0

-40

80

140

120

100

60

20

40

100

Resistance Value (mOhm)

5

150

10

200

20

50

2

200

0

250

50 100

table A