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esIsTor
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Irewound
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hassIs
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erIes
k
ey
F
eatureS
• Resistances from 0.005 to 250kOhms
• Tolerance to ± 0.01%
• High Temperature: -55ºC to +275ºC
• Low TCR: ± 20ppm/ ºC
• Power Rating 5 to 300 Watts
• Excellent Pulse Handling
• Non-Inductive windings available
• Four Terminal Versions Available (Call Factory)
a
pplicationS
• Motor Control
• Braking Systems
• Welding
• X-Ray
p
roduct
S
ummary
POWER RATING
(W @ 25ºC)
PRODUCT
SERIES
(RWC)
G1
G2
G3
G4
RESISTANCE
RANGE (Ω) 1
0.01 to 22K
0.01 to 47K
0.01 to 90K
0.01 to 250K
FREE
AIR
4.5
7.5
12
20
DIELECTRIC
STRENGTH
1500 VAC
1500 VAC
2500 VAC
3500 VAC
TEMPERATURE
COEFFICIENT
>10Ω: ± 20ppm/ºC
1Ω to 10Ω: ± 50ppm/ºC - 55ºC to + 275ºC
<1Ω: Call Factory
TEMPERATURE
RANGE
COMMERCIAL
7.5
a
12.5
a
25
b
50
c
MIL
5
a
10
a
20
b
30
c
1
a
TOLERANCE
: ± 0.01 to ± 10% (1% Standard)
For non-inductive windings, divide maximum resistance by 2
Heatsink required: 0.040 [1.0] Aluminum Plate, 129 in
2
[832 cm
2
] or equiv.
a
Vailable
o
ptionS
(Consult Factory)
•
•
Special Testing Requirements
Special Pulse Requirements
b
Heatsink required: 0.040 [1.0] Aluminum Plate, 167 in
2
[1077 cm
2
] or
equiv.
Heatsink required: 0.059 [1.5] Aluminum Plate, 291 in
2
[1877 cm
2
] or
equiv.
c
d
e
Heatsink required: 0.125 [3.2] Aluminum Plate, 294in
2
[1896cm
2
] or equiv.
H
ow to
o
rder
RWC
RESISTOR WIRE-
WOUND CHASSIS
MOUNT
Heatsink required: 0.125 [3.2] Aluminum Plate, 895 in
2
[5780 cm
2
] or
equiv.
N
WINDINGS
G1
PACKAGE CODE,
WATTS (COMMERCIAL),
RESISTANCE
G1, 7.5W, [0.01 to 22k]Ω
G2, 12.5W, [0.01 to 47k]Ω
G3, 25.0W, [0.01 to 90k]Ω
G4, 50.0W, [0.01 to 250k]Ω
U
TEMPERATURE
COEFFICIENT OF
RESISTANCE (TCR)
U = ± 20ppm/°C
Q = ± 50ppm/°C
Z = Special
003K8
RESISTANCE
F
TOLERANCE
S
PACKING
S = Standard
N = Non-Inductive
038R0 = 38Ω
003K8 = 3.8KΩ
038K0 = 38.0KΩ
380K0 = 380.0KΩ
003M8 = 3.8MΩ
Letter denotes
decimal place.
R = decimal., “K” 10
3
, “M” 10
6
Remaining 4 digits are
significant or placeholders.
T= ± 0.01%
Q= ± 0.02%
A= ± 0.05%
B= ± 0.1%
F= ± 1.0%
J= ± 5.0%
K= ± 10.0%
S = Bulk
For Tin/Lead coated leads, add "- Pb" to part number.
Standard Termination Finish: Matte Tin (Sn)
Example P/N: RWCNG1U003K8FS is Resistor Wirewound Chassis Mount, Non-Inductive, 7.5W, ±20ppm/ºC, 3.8KΩ, ±1.0%, bulk
40
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HaracteriSticS
Package Code
A
(Tolerances)
±0.005 [±0.13 mm]
B
(Tolerances)
±0.005 [±0.13 mm]
C
(Tolerances)
±0.031 [±0.79 mm]
D
(Tolerances)
±0.062 [±1.57 mm]
E
(Tolerances)
±0.015 [±0.38 mm]
F
(Tolerances)
±0.015 [±0.38 mm]
G
(Tolerances)
±0.015 [±0.38 mm]
H
(Tolerances)
±0.010 [±0.25 mm]
G1
0.444 [11.28]
0.490 [12.45]
0.600 [15.24]
1.125 [28.58]
0.334 [8.48]
0.646 [16.41]
0.320 [8.13]
0.065 [1.65]
0.140 [3.56]
0.078 [1.98]
0.093 [2.36]
0.078 [1.98]
0.050 [1.27]
0.266 [6.76]
0.245 [6.22]
0.051 [1.30]
0.085 [2.16]
G2
0.562 [14.27]
0.625 [15.88]
0.750 [19.05]
1.320 [33.53]
0.430 [10.92]
0.800 [20.32]
0.400 [10.16]
0.075 [1.91]
0.190 [4.83]
0.093 [2.36]
0.093 [2.36]
0.102 [2.60]
0.080 [2.03]
0.312 [7.93]
0.312 [7.92]
0.098 [2.49]
0.160 [4.06]
G3
0.719 [18.26]
0.781 [19.84]
1.062 [26.97]
1.870 [47.50]
0.530 [13.46]
1.080 [27.43]
0.560 [14.22]
0.085 [2.16]
0.260 [6.60]
0.172 [4.37]
0.125 [3.18]
0.125 [3.18]
0.080 [2.03]
0.438 [11.13]
0.391 [9.93]
0.098 [2.49]
0.185 [4.70]
G4
1.563 [39.70]
0.844 [21.44]
1.968 [49.99]
2.760 [70.10]
0.615 [15.62]
1.140 [28.96]
0.615 [15.62]
0.085 [2.16]
0.300 [7.62]
0.196 [4.98]
0.125 [3.18]
0.125 [3.18]
0.080 [2.03]
0.438 [11.13]
0.422 [10.72]
0.098 [2.49]
0.185 [4.70]
Dimensions
Inches [mm]
J
(Tolerances)
±0.010 [±0.25 mm]
K
(Tolerances)
±0.010 [±0.25 mm]
L
(Tolerances)
±0.005 [±0.13 mm]
M
(Tolerances)
±0.015 [±0.38 mm]
N
(Tolerances)
±0.006 [±0.15 mm]
O
(Tolerances)
±0.062 [±1.57 mm]
P
(Tolerances)
±0.031 [±0.79 mm]
Q
(Tolerances)
±0.002 [±0.05 mm]
R
(Tolerances)
±0.031 [±0.79 mm]
MIL-R-39009 / MIL-R-18546
RER-60 / RE-60
RER-65 / RE-65
RER-70 / RE-70
RER-75 / RE-75
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41
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nVironmental
p
erFormance
Environmental Performance (MIL-STD 202)
Vibration
Load Life
Moisture Resistance
Dielectric
Storage
Shock
Thermal Shock
5X Overload (5s)
CONSTRUCTION NOTES:
Centerless ground ceramic core
Tinned copper or copperweld leads
All welded terminations
High Temperature epoxy molding compound
Anodized aluminum housing
Moisture Sensitivity Level: MSL-1
D
R
± 0.1 % + 0.05
Ω
± 1% + 0.05
Ω
± 0.2 % + 0.05
Ω
± 0.2 % + 0.05
Ω
± 0.2 % + 0.05
Ω
± 0.1 % + 0.05
Ω
± 0.2 % + 0.05
Ω
± 0.2 % + 0.05
Ω
Power Derating Curve
120
Rated Power ( % )
100
Mo
un
ted
80
on
He
a
60
G1 & G2
G3
tsi
nk
Free-Air Derating:
G1, G2, G3, G4
40
G4
20
0
0
50
100
150
200
250
300
350
Ambient Temperature (°C)
This datasheet is subject to change without notice.
42
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