FHR 2-3025 3818 FHR 4-3825 3825H 4618
Powertron
•
•
•
•
•
Resistances from 0.001Ohm to 100Ohms
Power Rating to 50Watt
Resistance Tolerances to ±0.1%
TCR to ±10ppm/K
Very Low Inductance
SPECIFICATIONS
Type
FHR 2-3025
FHR 2-3818
0.010 to 100Ohms
3W
40 W
2.0 K/W
FHR 4-3825
FHR 4-3525H
FHR 4-4618
0.001 to 100Ohms
3W
5W
50 W
1.6 K/W
1% / 2% / 5%
0.5% / 1% / 2% / 5%
0.1% / 0.25% / 0.5% / 1% / 2% / 5%
0.1% / 0.25% / 0.5% / 1% / 2% / 5%
0.1% / 0.2% / 0.5%
(depends on stress)
Resistance Range
Power rating
free air 70°C
for 3825H
with heatsink
Thermal Resistance Rthj-c
Tolerances
from 0R001
from 0R005
from 0R01
from 0R02
Stability
Temperature Coefficient
Standard
Option 1
Max. Current
Voltage Proof
Thermal EMF
Operating Temperature Range
Resistor Material
Substrate
Housing
Connector Material
Terminals
Max. torque
0.5% / 1% / 2% / 5%
0.25% / 0.5% / 1% / 2% / 5%
±15ppm/K (20 to 60°C)
R ≤ 0R2 TCR see table A next page
±15ppm/K (20 to 60°C)
±25ppm/K (20 to 60°C) for contact F
±10ppm/K (20 to 60°C)
(only contact A and K)
150 A / 200 A for contact F
500 VDC
< 0.1µV/K
-40 to 130°C
CuNiMn-Foil
anodized aluminium
Epoxy
Cu tinned
2
1 Nm
4
Ordering Information
Part Number - Resistance - Contact - Tolerance
FHR 4-4618 0.050 Ohms A 1%
Document Number: 64206
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
FHR 2-3025 3818 FHR 4-3825 3825H 4618
Powertron
SPECIFICATIONS
(continued)
Temperature Coefficient
4000
250
table A
2000
DR/R
(ppm)
+15ppm/K
200
0
TCR-Shift (ppm/K)
150
-2000
-15ppm/K
100
-4000
Limit 2 (3s)
-6000
Nominal
DR/R
Limit 1 (3s)
50
0
10
20
50
2
5
100
200
-8000
-40
-20
0
20
40
60
Temperature (°C)
80
100
120
140
Resistance Value (mOhm)
Derating
120
Power ( % from
nominal power)
Power Rating Notes -
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
Where:
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 )
Dimension
A
B
C
D
E
F
G
H
I
J (A-Contact)
J (K-Contact)
K
L
M
N
N (Variante H)
O
P
Q (A-Contact)
Q (K-Contact)
R
S (Variante H)
mm
24.00
38.00
1.40
4.00
34.00
17.50
1.5x45°
17.50
27.50
1.50
1.10
3.00
3.20
2.00
max.5.5
max.10.3
30.40
15.00
3.60
3.30
2.80
19.00
tol.
(±mm)
0.2
0.3
0.4
0.1
0.3
0.2
0.1
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.4
0.2
0.1
0.1
0.1
0.2
inches
0.94
1.50
0.06
0.16
1.34
0.69
0.06x45°
0.69
1.08
0.06
0.04
0.12
0.13
0.08
max.0.22
max.0.4
1.20
0.59
0.14
0.13
0.11
0.75
tol.
(±inches)
0.008
0.012
0.016
0.004
0.012
0.008
0.004
0.008
0.008
0.004
0.004
0.004
0.004
0.004
0.008
0.008
0.016
0.008
0.004
0.004
0.004
0.008
50
85
100
115
130
Temperature of the backplate (°C)
FHR 4-3825 / FHR 4-3825H
Dimensions
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64206
Revision: 20-09-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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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
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properties described in the product specification is suitable for use in a particular application.
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Document No.: 63999
Revision: 27-Apr-11
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1
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