F E A T U R E S
S P E C I F I C A T I O N S
• 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
Material
WL Series
Ceramic Core: CeramTec
Rubalit® 96% alumina
End Caps: Stainless steel, preci-
sion formed
Leads: Copper wire, 100% Sn
(Lead Free) coated
Miniature Wirewound
Current Sense
0.984 / 25
L
D
d
CN49W alloy resistance wire TC
±20ppm/°C
• Manufacturing process–Wire
winding/Spot Welding–by
Computer Numerical Control
(CNC) machine tools to ensure
consistency of product quality.
• Encapsulated by epoxy molding
compound
Encapsulation: SUMICON 1100/
1200 Epoxy molding compound
for IC encapsulation
�
ꢀ
Power Resistance
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
Rating
Range
Dim. L
(mm/in)
Dim. D
(mm/in)
Dim. d
(mm/in)
Type (watts)
(Ω)
WLA
WLB
WLC
0.5
1
2
0.005-0.100 5.08 / 0.200 2.54 / 0.100 0.60 / 0.024
0.005-0.100 7.00 / 0.276 3.00 / 0.120 0.60 / 0.024
0.010-0.100 11.4 / 0.450 6.86 / 0.270 0.80 / 0.031
• Advanced IC encapsulation
mold/die technologies
D E R A T I N G
100
P E R F O R M A N C E C H A R A C T E R I S T I C S
80
60
40
20
0
Test
Conditions Of Test
Performance
Thermal Shock
Rated power applied until thermal stability, ±2.0%
-55°C +0°C,-5°C,15min.
Short-time Overload 5 times rated wattage for 5 seconds
±2.0%
±2.0%
Solderability
Method 208 of MIL-STD-202
Terminal Strength
Pull test:10 pounds, 5 to10 seconds, Twist ±1.0%
test: 1080°,5 second/rotation
0
25 50 75 100 125 150 175
Dielectric
Withstanding Voltage
500 Volts rms for 1W. 1 minute
±1.0%
Ambient Temperature, °C
High Temperature
Exposure
Exposed to an ambient temperature of 275 ±5.0%
+5/-0°C for 250 ±8 hours,
S TA N D A R D P A R T N U M B E R S F O R W L S E R I E S
Moisture Resistance MIL-STD-202 Method 106, 7b not appli-
cable
±2.0%
±2.0%
±1.0%
±5.0%
Wattage:
Series:
0.5
1.0
2.0
WLA
WLB
WLC
Low Temperature
Storage
Cold chamber at a temperature of -65
±2°C for 24 ±4 hours
Ohms
Vibration, High
Frequency
Frequency varied 10 to 2000Hz, 200G
peak, 2 directions 6 hours each
0.005
0.01
0.015
0.02
WLAR005FE
WLAR01FE
WLAR015FE
WLAR02FE
WLBR005FE
WLBR01FE
WLBR015FE
WLBR02FE
WLCR01FE
WLCR015FE
WLCR02FE
Load Life
1000/2000 hours at rated power, +25°C,
1.5 hours “On”, 0.5 hours “Off”
0.025
0.03
0.05
0.10
WLAR025FE
WLAR03FE
WLAR05FE
WLAR10FE
WLBR025FE
WLBR03FE
WLBR05FE
WLBR10FE
WLCR025FE
WLCR03FE
WLCR05FE
WLCR10FE
O R D E R I N G I N F O R M AT I O N
RoHS compliant
Check product availability at www.ohmite.com
� ꢀ ꢁ ꢂ ꢃ ꢄ ꢃ ꢅ ꢆ ꢇ ꢈ
Series Power Ohms Tolerance Package
A = 0.5
B = 1
F = 1%
J = 5%
T = Tape
blank = 25pc Pack
C = 2
K E Y T O F I V E - B A N D C O D E
Band
1
2
Digit
0
3
4
5
�ꢁꢂꢃ
ꢀ
Color
Multiplier
Tolerance
Black
Brown
Red
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
x
1Ω
10Ω
1
x
x
x
x
±
±
1% (F)
2% (G)
To see the latest in resistor
technology click on the “What’s
New” tab at ohmite.com
2
100Ω
1KΩ
Orange
Yellow
Green
Blue
3
4
10KΩ
5
x 100KΩ
±
0.5% (D)
6
x
x
1MΩ
± 0.25% (C)
± 0.10% (B)
± 0.05%
Violet
Grey
7
10MΩ
8
White
Gold
9
x 0.001Ω
x
x
0.1Ω
±
±
5% (J)
Silver
0.01Ω
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