For technical questions, contact: powertron@vishaypg.com
KPR KPN KHR KHN T227
Powertron
Document Number: 64211
Revision: 20-09-10
www.powertron.de
1
Type KPR 2/4-T227
KPN 2-T227
KHR 2/4-T227
KHN 2-T227
Resistance Range 0.05 Ohms to 5 MOhms
Power rating with heatsink 100 W 200 W
Thermal Resistance Rthj-c 0.7 K/W 0.35 K/W
Tolerances
from 0.05 Ohms
from 0.1 Ohms
2% / 5% / 10%
1% / 2% / 5% / 10%
Stability 1%
Temperature Coefcient
0.05 to 0.099 Ohms
0.1 to 5 MOhms
±300 ppm/K
±100 ppm/K
upon request ±50 ppm/K
Voltage Proof Standard 1.5 kVDC / upon request 2.5 kVDC
Inductivity ≤ 50 nH
Capacity ≤ 35 pF
Max. Voltage
depending on resistance value
1
10
100
1000
10000
10 Ohm 100 Ohm 1 kOhm 5 kOhm 10 kOhm 100 kOhm
max. working voltage (VDC)
Operating Temperature Range -55 to 155°C
Resistor Material Thick Film
Substrate Al2O3
Housing Epoxy or Plastic
Connector Material Cu tinned
Terminals 2 or 4
Max. Torque
backplate
terminals
1.5 Nm
1.3 Nm
SPECIFICATIONS
Part Number - Resistance - Tolerance
Standard: KHR 2-T227 10 Ohms 5% / Special: KHR 2-T227 10 Ohms 5% 2.5 kVDC
Ordering Information
Resistances from 0.05Ohm to 5MOhms•
Power Rating to 200Watt•
Resistance Tolerances to ±1%•
TCR to ±50ppm/K•
TO-227 (TO-238) Housing•
For technical questions, contact: powertron@vishaypg.com
KPR KPN KHR KHN T227
Powertron
Document Number: 64211
Revision: 20-09-10
www.powertron.de
2
0,0002
0,0005
0,001
0,002
0,005
0,01
0,02
0,05
0,1
0,2
0,5
10
20
50
100
Pulse time (s)
Pulse Energy
10kJ
3kJ
1kJ
300J
100J
3J
1J
0,3J
0,1J
-8000
-3000
2000
7000
-50 -25 025 50 75 100 125
50ppm/K
100ppm/K
∆R/R (ppm)
Temperature (°C)
0
20
40
60
80
100
120
50 75 85 100 115 130 145 155
Temperature of the backplate (°C)
Power ( % from
nominal power)
Temperature Coefcient
SPECIFICATIONS (continued)
Pulse Stability
Derating
Power Rating Notes -
The KPR / KPN / KHR / KHN Series Resistors must be at-
tached to a suitable heatsink. The maximum internal resistor
temperature is 155°C.
To specify an appropriate heatsink use the following formula :
RqH = TMAX - ( P x RqR ) - TA
P
Where: RqH = Thermal Resistance of Heatsink ( K/W )
R
qR = Thermal Resistance of Resistor ( K/W )
T
MAX = Maximum Temperature of Resistor
T
A = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
For technical questions, contact: powertron@vishaypg.com
KPR KPN KHR KHN T227
Powertron
Document Number: 64211
Revision: 20-09-10
www.powertron.de
3
SPECIFICATIONS (continued)
Dimensions and Attachment Variations
KPR/KHR 2-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
F15 0.2 0.59 0.008
G 4.1 0.2 0.16 0.008
H10 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
KPR/KHR 4-T227 KPN/KHN 2-T227
KPR/KHR 2-T227 dia1 KPR/KHR 2-T227 dia2
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
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