FHR 2-3025 3818
Powertron
FEATURES
•
•
•
•
•
•
Resistances from 0.01Ohm to 100Ohms
Power Rating to 40Watt
Resistance Tolerances to ±0.5%
TCR to ±50ppm/K
Very Low Inductance
Stability to 0.1%
TABLE 1—SPECIFICATIONS
TYPE
Resistance Range
Power Rating
Tolerances
from 0R01
from 0R02
Thermal Resistance
Stability (1000h)
Temperature Coefficient
Voltage Proof
Maximum Current
Thermal EMF
Operating Temperature Range
Resistor Material
Housing
Substrate
Connector Material
Terminals
Max. torque
Free air 70°C
With heatsink
3W
40W
0.5% / 1% / 2% / 5%
0.25% / 0.5% / 1% / 2% / 5%
2.0 K/W
0.1% / 0.2% / 0.5%
(depends on stress)
±50ppm/K (20 to 60°C)
other specifications upon request
500 VDC
150 A
<0.1 μV/K
–40°C to 130°C
CuNiMn-Foil
Epoxy
Anodized aluminium
Cu / tinned
2
1 Nm
FHR 2-3025
FHR 2-3818
0.010 to 100Ohms
ORDERING INFORMATION
Part Number - Resistance - Contact - Tolerance
FHR 2-3818 0.050 Ohms A 1%
Document No.: 64206
Revision: 22-04-2013
For technical questions,
contact
powertron@vishaypg.com
www.powertron.de
1
FHR 2-3025 3818
Powertron
FIGURE 1—TEMPERATURE COEFFICIENT
4000
2000
Limit 2
0
-2000
∆R/R
(ppm)
-4000
Nominal
∆R/R
-6000
-8000
-10000
Limit 1
-12000
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 2—DERATING
Power Rating Notes -
120
Power ( % from
nominal power)
100
80
60
40
20
0
25
0.5%
0.2%
0.1%
The FHR Series Resistors must be attached to a suitable heat-
sink. The maximum internal resistor temperature is 130°C.
To specify an appropriate heatsink use the following formula :
R
qH
= T
MAX
- ( P x R
qR
) - T
A
P
50
85
100
115
130
Where:
Temperature of the backplate (°C)
R
qH
= 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 )
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For technical questions,
contact
powertron@vishaypg.com
Document No.: 64206
Revision: 22-04-2013
FHR 2-3025 3818
Powertron
FIGURE 3—DIMENSIONS
in mm (inches)
FHR 2-3025
Dimension
A
±0.2 (±0.008)
B
±0.2 (±0.008)
C
±0.4 (±0.016)
D
±0.1 (±0.004)
E
±0.2 (±0.008)
F
±0.2 (±0.008)
G
±0.1 (±0.004)
H
±0.2 (±0.008)
I
±0.1 (±0.004)
J
±0.1 (±0.004)
K
±0.1 (±0.004)
L
±0.1 (±0.004)
M
±0.2 (±0.008)
N
±0.4 (±0.016)
O
±0.2 (±0.008)
P
±0.1 (±0.004)
Q
±0.2 (±0.008)
A-Contact
K-Contact
24.00 (0.94)
30.00 (1.18)
1.40 (0.06)
4.00 (0.16)
27.00 (1.06)
15.00 (0.59)
1.5x45° (0.06x45°)
20.32 (0.80)
1.50 (0.06)
1.10 (0.04)
1.10 (0.04)
3.20 (0.13)
2.00 (0.08)
max.5.5 (0.22)
30.40 (1.20)
15.00 (0.59)
3.60 (0.14)
3.30 (0.13)
2.80 (0.11)
FHR 2-3818
Dimension
A
±0.2 (±0.008)
B
±0.3 (±0.012)
C
±0.4 (±0.016)
D
±0.2 (±0.008)
E
±0.3 (±0.012)
F
±0.2 (±0.008)
G
±0.1 (±0.004)
H
±0.2 (±0.008)
I
±0.1 (±0.004)
J
±0.1 (±0.004)
K
±0.1 (±0.004)
L
±0.1 (±0.004)
M
±0.2 (±0.008)
N
±0.4 (±0.016)
O
±0.2 (±0.008)
P
±0.1 (±0.004)
Q
±0.2 (±0.008)
A-Contact
K-Contact
17.00 (0.67)
38.00 (1.50)
1.40 (0.06)
8.50 (0.33)
32.00 (1.26)
27.00 (1.06)
1.5x45° (0.06x45°)
20.32 (0.80)
1.50 (0.06)
1.10 (0.04)
1.10 (0.04)
3.20 (0.13)
2.00 (0.08)
max.5.5 (0.22)
23.40 (0.92)
15.00 (0.59)
3.60 (0.14)
3.30 (0.13)
2.80 (0.11)
Document No.: 64206
Revision: 22-04-2013
For technical questions,
contact
powertron@vishaypg.com
www.powertron.de
3
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and
conditions of purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
and conditions of purchase.
To the maximum extent permitted by applicable law, Vishay Precision
Group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and
all liability, including without limitation special, consequential or incidental damages, and (iii) any and
all implied warranties, including warranties of fitness for particular purpose, non-infringement and
merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different
applications and performance may vary over time. Statements regarding the suitability of products for
certain types of applications are based on Vishay Precision Group’s knowledge of typical requirements that
are often placed on Vishay Precision Group products. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular
application.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or
by any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless
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indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay
Precision Group for any damages arising or resulting from such use or sale. Please contact authorized
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such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document No.: 63999
Revision: 27-Apr-2011
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