WL Series
Miniature Wirewound Current Sense Resistors
| Type | Power Rating (watts) | Resistance Range (ohms) | Dim. L (mm/in) | Dim. D (mm/in) | Dim. d (mm/in) |
| WLA | 0.5 | 0.005-0.100 | 5.08 / 0.200 | 2.54 / 0.100 | 0.60 / 0.024 |
| WLB | 1 | 0.005-0.100 | 7.00 / 0.276 | 3.00 / 0.120 | 0.60 / 0.024 |
| WLC | 2 | 0.010-0.100 | 11.4 / 0.450 | 6.86 / 0.270 | 0.80 / 0.031 |
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 standard (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
DERATING
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SPECIFICATIONS
Material
- Ceramic Core: CeramTec Rubalit® 96% alumina
- End Caps: Stainless steel, precision 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 </=0.03 ohms
±100ppm/°C for >/=0.033 ohms
- Maximum Working Voltage:
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PERFORMANCE CHARACTERISTICS
| Test | Conditions Of Test | Performance |
| Thermal Shock | Rated power applied until thermal stability, -55°C +0°C,-5°C,15min. | ±2.0% |
| Short-time Overload | 5 times rated wattage for 5 seconds | ±2.0% |
| Solderability | Method 208 of MIL-STD-202 | ±2.0% |
| Terminal Strength | Pull test:10 pounds, 5 to10 seconds, Twist test: 1080°,5 second/rotation | ±1.0% |
| Dielectric Withstanding Voltage | 500 Volts rms for 1W, 2W. 1 minute | ±1.0% |
| High Temperature Exposure | Exposed to an ambient temperature of 275 +5/-0°C for 250 ±8 hours, | ±5.0% |
| Moisture Resistance | MIL-STD-202 Method 106, 7b not applicable | ±2.0% |
| Low Temperature Storage | Cold chamber at a temperature of -65 ±2°C for 24 ±4 hours | ±2.0% |
| Vibration, High Frequency | Frequency varied 10 to 2000Hz, 200G peak, 2 directions 6 hours each | ±1.0% |
| Load Life | 1000/2000 hours at rated power, +25°C, 1.5 hours "On", 0.5 hours "Off" | ±5.0% |
HOW TO ORDER
KEY TO FIVE-BAND CODE
| Band | 1 | 2 | 3 | 4 | 5 |
| Color | Digit | Multiplier | Tolerance |
| Black | 0 | 0 | 0 | x 1 ohms | |
| Brown | 1 | 1 | 1 | x 10 ohms | ± 1% (F) |
| Red | 2 | 2 | 2 | x 100 ohms | ± 2% (G) |
| Orange | 3 | 3 | 3 | x 1K ohms | |
| Yellow | 4 | 4 | 4 | x 10K ohms | |
| Green | 5 | 5 | 5 | x 100K ohms | ± 0.5% (D) |
| Blue | 6 | 6 | 6 | x 1M ohms | ± 0.25% (C) |
| Violet | 7 | 7 | 7 | x 10M ohms | ± 0.10% (B) |
| Grey | 8 | 8 | 8 | | ± 0.05% |
| White | 9 | 9 | 9 | x 0.001 ohms | |
| Gold | | | | x 0.1 ohms | ± 5% (J) |
| Silver | | | | x 0.01 ohms | ± 10% (K) |
STANDARD PART NUMBERS AVAILABLE
| Wattage: | 0.5 | 1.0 | 2.0 |
| Series: | WLA | WLB | WLC |
| Ohms | | | |
| 0.005 | WLAR005FE | WLBR005FE |
| | 0.01 | WLAR01FE | WLBR01FE | WLCR01FE |
| 0.015 | WLAR015FE | WLBR015FE | WLCR015FE |
| 0.02 | WLAR02FE | WLBR02FE | WLCR02FE |
| 0.025 | WLAR025FE | WLBR025FE | WLCR025FE |
| 0.03 | WLAR03FE | WLBR03FE | WLCR03FE |
| 0.05 | WLAR05FE | WLBR05FE | WLCR05FE |
| 0.10 | WLAR10FE | WLBR10FE | WLCR10FE |
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NEW PRODUCT ARCHIVES
Standard part numbers and availability