FPR FNR 2-T227 4-T227
Foil Power Resistors
•
•
•
•
•
Resistances from 0.001Ohm to 100Ohms
Power Rating to 80Watt
Resistance Tolerances to ±0.1%
TCR to ±25ppm/°C
Load Stability to 0.1%
SPECIFICATIONS
Type
Terminals
Resistance Range
Power Rating
(with heatsink)
Thermal Resistance Rthj-c
Tolerances
(depends on resistance)
Stability
FPR 2-T227
2
0.01 to 100 Ohms
60W
FPR 4-T227
4
(kelvin connection)
0.001 to 50 Ohms
FNR 2-T227
2
0.01 to 100 Ohms
80W
FNR 4-T227
4
(kelvin connection)
0.001 to 50 Ohms
1.3 K/W
0.1%
1
/ 1% / 2% / 5%
(others upon request)
0.1% / 0.2% / 0.5%
(depends on stress)
1.0 K/W
Temperature Coefficient ²
±25 ppm/K (20 to 60°C)
±50 ppm/K (- 40 to 130°C)
FPR 2-T227 / FNR 2-T227 TK Shift depends from
resistance value (see graph next page)
1.5 kV DC ( higher upon request )
< 1 µV/K
45A (85A on request)
-40°C to 130°C
Metalfoil CuNiMn (DIN 17471)
Al
2
O
3
Epoxy
Cu / tinned or nickel plated
backplate: 1.5Nm
terminals: 1.3 Nm
MSL 1
1
2
Voltage Proof
Thermal EMF
Max. Current
Operating Temperature
Resistor Material
Substrate
Housing
Connector Material
Max. Torque
MSL Level
50A (100A on request)
AlN
Please inquire for low ohm values
Contact office for additinal TCR values
Ordering Information
Part Description: Part Type - Resistance - Tolerance
FPR 2-T227 1.1 Ohms 1%
Riedon Inc.
© Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201801_002
FPR FNR
2-T227 4-T227
Foil Power Resistors
SPECIFICATIONS
(continued)
Temperature Coefficient
4000
table A
250
2000
+15ppm/°C
200
0
-15ppm/°C
-2000
Limit 2 (3σ)
TCR - Shift (ppm/K)
∆R/R (ppm)
150
100
-4000
Nominal ∆R/R
-6000
Limit 1 (3σ)
-8000
-40
-20
0
20
40
60
80
100
120
140
50
0
2
5
10
20
50
100
200
Temperature (°C)
Resistance Value (mOhm)
Derating and Stability
Power Rating Notes -
120
100
Power ( % from
nominal power)
0.5%
0.2%
0.1%
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 :
80
60
40
20
0
25
R
θH
= T
MAX
- ( P x R
θR
) - T
A
P
Where:
R
θ
H
= Thermal Resistance of Heatsink ( K/W )
R
θ
R
= Thermal Resistance of Resistor ( K/W )
T
MAX
= Maximum Temperature of Resistor
T
A
= Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
50
85
100
115
130
Tem perature of the backplate (°C)
Dimensions and Attachment Variations
Dimension
A
B
C
D
E
F
G
H
I
J
K
L
M
N
mm
26
38
12.7
4
30
15
4.1
10
8
4
2
0.8
M4
10
11.9
0.2
0.2
tol.
(±mm)
0.5
0.5
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.1
inches
1.02
1.50
0.50
0.16
1.18
0.59
0.16
0.39
0.31
0.16
0.08
0.03
M4
0.39
0.47
0.008
0.008
tol.
(±inches)
0.020
0.020
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.008
0.004
FPR/FNR 2-T227
Riedon Inc.
© Riedon, Inc.
FPR/FNR 4-T227
O
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201801_002
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