WL Series
Miniature Wirewound
Current Sense
0.984 /
25
L
D
d
FEATURES
• Ultra-low ohmic value series for
Current Sensing applications
• Very low inductance (<1nH at
1MHz Test)
• Miniaturized dimensions, Better
power to dimension ratios
• Use of the highest quality stan-
dard (96% Alumina) ceramic
core
• Manufacturing process–Wire
winding/Spot Welding–by
Computer Numerical Control
(CNC) machine tools to ensure
consistency of product quality.
• Encapsulated by epoxy molding
compound
• Advanced IC encapsulation
mold/die technologies
SPECIFICATIONS
Material
Ceramic Core:
CeramTec
Rubalit
®
96% alumina
End Caps:
Stainless steel, preci-
sion formed
Leads:
Copper wire, 100% Sn
(Lead Free) coated
CN49W alloy
resistance wire TC
±20ppm/°C
Encapsulation:
SUMICON 1100/
1200 Epoxy molding compound
for IC encapsulation
Electrical
Standard Tolerance:
F (1.0%),
J (5.0%)
Temperature Coefficient
(ppm/°C):
±300ppm/°C for
≤0.03Ω
±100ppm/°C for
≥0.033Ω
Maximum Working Voltage:
√PxR
�½
�½
Type
WLA
WLB
WLC
Power Resistance
Rating
Range
(watts)
(Ω)
0.5
0.005-0.100
1
0.005-0.100
2
0.010-0.100
Dim. L
(mm/in)
5.08 / 0.200
7.00 / 0.276
11.4 / 0.450
Dim. D
(mm/in)
2.54 / 0.100
3.00 / 0.120
6.86 / 0.270
Dim. d
(mm/in)
0.60 / 0.024
0.60 / 0.024
0.80 / 0.031
DERATING
Percent Rated Power
PERFORMANCE CHARACTERISTICS
Test
Thermal Shock
Short-time Overload
Solderability
Terminal Strength
Conditions Of Test
Rated power applied until thermal stability,
-55°C +0°C,-5°C,15min.
5 times rated wattage for 5 seconds
Method 208 of MIL-STD-202
Pull test:10 pounds, 5 to10 seconds, Twist
test: 1080°,5 second/rotation
500 Volts rms for 1W. 1 minute
Performance
±2.0%
±2.0%
±2.0%
±1.0%
±1.0%
±5.0%
±2.0%
±2.0%
±1.0%
±5.0%
100
80
60
40
20
0
0
25 50 75 100 125 150 175
Ambient Temperature,
°C
Dielectric
Withstanding Voltage
High Temperature
Exposed to an ambient temperature of 275
Exposure
+5/-0°C for 250 ±8 hours,
Moisture Resistance MIL-STD-202 Method 106, 7b not appli-
cable
Low Temperature
Cold chamber at a temperature of -65
Storage
±2°C for 24 ±4 hours
Vibration, High
Frequency varied 10 to 2000Hz, 200G
Frequency
peak, 2 directions 6 hours each
Load Life
1000/2000 hours at rated power, +25°C,
1.5 hours “On”, 0.5 hours “Off”
S TA N D A R D PA RT N U M B E R S F O R W L S E R I E S
Wattage:
Series:
Ohms
0.005
0.01
0.015
0.02
0.025
0.03
0.05
0.10
WLAR005FE
WLAR01FE
WLAR015FE
WLAR02FE
WLAR025FE
WLAR03FE
WLAR05FE
WLAR10FE
WLBR005FE
WLBR01FE
WLBR015FE
WLBR02FE
WLBR025FE
WLBR03FE
WLBR05FE
WLBR10FE
WLCR01FE
WLCR015FE
WLCR02FE
WLCR025FE
WLCR03FE
WLCR05FE
WLCR10FE
0.5
WLA
1.0
WLB
2.0
WLC
O R D E R I N G I N F O R M AT I O N
RoHS compliant
�½�½�½�½�½�½�½�½�½�½�½
Series Power
A = 0.5
B=1
C=2
Ohms Tolerance Package
T = Tape
F = 1%
J = 5%
blank = 25pc Pack
Check product availability at
www.ohmite.com
KEY TO FIVE-BAND CODE
�½�½�½�½ �½
Band
Color
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
1
0
1
2
3
4
5
6
7
8
9
2
Digit
0
1
2
3
4
5
6
7
8
9
3
0
1
2
3
4
5
6
7
8
9
x
x
x
x
x
x
x
4
Multiplier
1Ω
10Ω
100Ω
1KΩ
10KΩ
±
±
5
Tolerance
1% (F)
2% (G)
x 100KΩ
1MΩ
10MΩ
± 0.5% (D)
± 0.25% (C)
± 0.10% (B)
± 0.05%
To see the latest in resistor
technology click on the “What’s
New” tab at ohmite.com
x 0.001Ω
x
x
0.1Ω
0.01Ω
±
±
5% (J)
10% (K)
14
Ohmite Mfg. Co.
1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
OHMITE [ OHMITE MFG. CO. ]
