E G4 FHRFNR2 4 T238

FHR FNR
2-T238 4-T238
• Extremely Low Ohm Rating
• High Stability
• Two- and
Four Circuit Technology
• Low Temperatur Coefficient
• Low Electrical Noise
• Low Inductance
SPECIFICATIONS
ELECTRICAL
FHR 2/4-T238
FHN 2-T238
FNR 2/4-T238
FNN 2-T238
Resistance Range
:
R01/R001...100R
R01/R001...100R
Power Rating
:
60 W*
* with heatsink
80 W*
1.3 K/W
1.0 K/W
Thermal Resistance Rthj-c :
Tolerances
:
0.5%, 1%, 2%, 5%
(other Tolerances upon request)
Stability
:
0.5
Temperatur Coefficient
:
±15 ppm/K (20...60)°C / ±50 ppm/K (-40...130)°C
R < R02: ±20 ppm/K (20...60)°C
FHR/FNR2-T238 as well as FHN/FNN TCR-Shift
depending on the resistor value
Voltage Proof
:
2.5 kVDC
Thermal EMF
:
< 1 µV/K
Max. Current
:
40 A
45 A
(higher Values upon request)
ENVIRONMENTAL
Operative Temperature Range :
MECHANICAL
Resistor Material
Substrate
Housing
Connector Material
:
:
:
:
-40°C...130°C
Metalfoil CuNiMn ( DIN 17471)
Al2O3
AlN
Epoxy
Cu or brass, tinned
2-pin, 4-pin
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK
Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk
FHR FNR
2-T238 4-T238
TEMPERATURE COEFFICIENT
(FHR/FNR and FHN/FNN 2-T238)
6000
250
- 50 ppm/K
+ 15 ppm/K
2000
0
- 15 ppm/K
-2000
Limit 2 (3σ)
200
150
100
50
Nom inal dR/R
-4000
0
Limit 1 (3σ)
-6000
-40
300
TCR - Shift (ppm/K)
dR/R (ppm )
4000
+ 50 ppm/K
-20
0
20
40
60
80
100
120
2
5
10
20
140
Tem perature (°C)
DERATING CURVE
Power ( % from
nominal power)
120
100
80
60
40
20
0
25
50
85
100
50
100
Resistance Value (m Ohm )
115
130
Tem perature of the backplate (°C)
DIMENSIONS
* screw terminal M4
Standard: Pin G (width= 6.35) leads curved
Dimensions in mm
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK
Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk
FHR FNR
2-T238 4-T238
FAULTY CONNECTION VARIATIONS
FHR/FNR 2-T238
FHR/FNR 4-T238
1 - U1 / 2 - U2 / 3 - I2 / 4 - I1
Dimensions in mm
HOW TO ORDER
FHR 2-T238 1R1 G 1%
FNR 4-T238 R001 F 2%
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK
Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk
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