WireWound
AxiAl
F e at u r e s
WL sꢀꢁꢂꢀꢃ
•ꢀUltra-lowꢀohmicꢀvalueꢀseriesꢀforꢀCurrentꢀSensingꢀ
applications
•ꢀVeryꢀlowꢀinductanceꢀ(<1nHꢀatꢀ1MHzꢀTest)ꢀ
•ꢀMiniaturizedꢀdimensions,ꢀBetterꢀpowerꢀtoꢀdimen-
sionꢀratios
Miniature Wirewound
Current Sense
•ꢀUseꢀofꢀtheꢀhighestꢀqualityꢀstandardꢀ(96%ꢀAlumina)ꢀ
ceramicꢀcore
•ꢀManufacturingꢀprocess–Wireꢀwinding/Spotꢀ
Welding–byꢀComputerꢀNumericalꢀControlꢀ(CNC)ꢀ
machineꢀtoolsꢀtoꢀensureꢀconsistencyꢀofꢀproductꢀ
quality.ꢀ
•ꢀEncapsulatedꢀbyꢀepoxyꢀmoldingꢀcompound
•ꢀAdvancedꢀICꢀencapsulationꢀmold/dieꢀtechnologiesꢀ
series sPeciFicatiONs
Type
Power Rating (watts)
Resistance Range (Ω)
0.005-0.100
WLA
WLB
WLC
WLD
0.5
1
2
0.005-0.100
0.010-0.100
0.010-0.100
3
characteristics
Derating
CeramTec Rubalit® 96% alumina
Stainless steel, precision formed
Copper wire, 100% Sn (Lead Free) coated
CN49W alloy TC ±20ppm/°C
Ceramic Core
End Caps
100
80
60
40
20
Leads
Resistance Wire
SUMICON 1100/1200 Epoxy molding compound for IC encapsulation
F (1.0%), J (5.0%)
Encapsulation
Standard Tolerance
Temperature Coefficient
Maximum Working Voltage
±300ppm/°C for ≤0.03Ω; ±100ppm/°C for ≥0.033Ω
√PxR
0
0
25 50 75 100 125 150 175
Ambient Temperature, °C
PerFOrMaNce Data
Test Conditions Of Test
Performance
±2.0%
±2.0%
±2.0%
±1.0%
±1.0%
±5.0%
±2.0%
±2.0%
±1.0%
±5.0%
Rated power applied until thermal stability, -55°C +0°C,-5°C,15min.
5 times rated wattage for 5 seconds
Thermal Shock
Short-time Overload
Solderability
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
Terminal Strength
Dielectric Withstanding Voltage
High Temperature Exposure
Moisture Resistance
Low Temperature Storage
Vibration, High Frequency
Load Life
Exposed to an ambient temperature of 275 +5/-0°C for 250 ±8 hours,
MIL-STD-202 Method 106, 7b not applicable
Cold chamber at a temperature of -65 ±2°C for 24 ±4 hours
Frequency varied 10 to 2000Hz, 200G peak, 2 directions 6 hours each
1000/2000 hours at rated power, +25°C, 1.5 hours “On”, 0.5 hours “Off”
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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