FNR 2-T227 0.250 OHM 1% 15PPM Riedon, FNR 2-T227 0.250 OHM 1% 15PPM Datasheet - Page 2

• Manufacturer Part Number: FNR 2-T227 0.250 OHM 1% 15PPM
• Description: RES .25 OHM 80W 1% FOIL TO-227
• Manufacturer: Riedon
• Series: FNRr

Specifications of FNR 2-T227 0.250 OHM 1% 15PPM

• Resistance (ohms): 0.25
• Power (watts): 80W
• Composition: Metal Foil
• Temperature Coefficient: ±15ppm/°C
• Tolerance: ±1%
• Coating, Housing Type: Epoxy Coated
• Mounting Feature: Flanges
• Size / Dimension: 1.500" L x 1.020" W (38.10mm x 25.91mm)
• Height: 0.390" (9.91mm)
• Lead Style: M4 Threaded
• Package / Case: SOT-227-2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FNR2-T227-0.250F

Riedon Inc.
FPR FNR
Foil Power Resistors
-2000
-4000
-6000
-8000
4000
2000
0
-40
FPR/FNR 2-T227
120
100
80
60
40
20
0
25
-20
0.5%
0.2%
0.1%
2-T227 4-T227
Tem perature of the backplate (°C)
0
300 Cypress Avenue
50
20
85
Temperature (°C)
Dimensions and Attachment Variations
FPR/FNR 4-T227
40
100
SPECIFICATIONS
Temperature Coefficient
60
Derating and Stability
115
Alhambra CA 91801
www.riedon.com
80
100
130
120
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
Where: R
θH
= T
Dimension
(continued)
140
P
C
D
G
H
M
N
O
A
B
E
F
J
K
L
MAX
I
R
T
T
P = Power Through Resistor ( W )
+15ppm/K
-15ppm/K
Limit 2 (3σ)
Nominal ∆R/R
Limit 1 (3σ)
A
MAX
θ
θ
= Ambient Temperature of Heatsink ( °C )
- ( P x R
H
R
= Thermal Resistance of Heatsink ( K/W )
= Thermal Resistance of Resistor ( K/W )
= Maximum Temperature of Resistor
[phone]
12.7
mm
11.9
4.1
0.8
M4
26
38
30
15
10
10
4
8
4
2
θR
) - T
250
200
150
100
50
0
A
(±mm)
2
Resistance Value (mOhm)
tol.
0.5
0.5
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.1
0.2
0.2
5
10
table A
[phone]
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
0.39
0.47
20
M4
50
100
(±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
0.008
0.008
tol.
200
2/10