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- **Features**:
- Patented Power Metal Strip® technology; metal strip/plate construction
- Ultra-low resistance: 0.015 Ω (15 mΩ), minimizing power loss and voltage drop
- High precision: ±1% (standard); ±0.5% and ±0.1% options available
- High power: Multiple power ratings available (e.g., 1 W / 2 W / 3 W / 5 W / 7 W)
- Low Temperature Coefficient of Resistance (TCR): ±75 ppm/°C (0.010 Ω–1.0 Ω range); component TCR < 20 ppm/°C
- Extremely low inductance: 0.5 nH to 5 nH
- Low thermal EMF: < 3 μV/°C
- All-welded construction; sulfur-resistant design
- High pulse handling capability, comparable to wirewound resistors
- AEC-Q200 automotive qualified
- Operating temperature range: -65°C to +275°C
Technical Specifications
- **Resistance**: 0.015 Ω (15 mΩ)
- **Resistance Marking**: R015 ('R' denotes the decimal point, i.e., 0.015 Ω); also written as 0.015R, 15 mR, 15MRF, etc.
- **Precision**: ±1% (standard); ±0.5% (WSLS series); ±0.1% optional
- **Power Rating**:
- WSL2512...18: 2 W @ 70°C (2512 package)
- WSL2010...18: 1 W @ 70°C (2010 package)
- WSR2: 2 W @ 70°C (4527 J-Lead package)
- WSR3: 3 W @ 70°C (4527 J-Lead package)
- WSHM2818: 7 W @ 105°C / 5 W @ 70°C (2818 package)
- LVR03: 3 W (axial lead package)
- LVR05: 5 W (axial lead package)
- **Package Dimensions**:
- 2512 (Imperial): 6.35 mm × 3.2 mm × 0.64 mm (WSL series most common)
- 2010 (Imperial): 5.08 mm × 2.54 mm × 0.635 mm
- 4527 (J-Lead): 11.56 mm × 6.98 mm × 2.54 mm (WSR2/WSR3)
- 2818 (Metric): 7.0 mm × 4.3 mm (WSHM series)
- Axial lead (LVR series): Through-hole mounting
- **Temperature Coefficient (TCR)**:
- WSL2512...18: ±75 ppm/°C (0.010Ω–1.0Ω)
- WSR2/WSR3: ±75 ppm/°C (0.010Ω–1.0Ω), component TCR < 20 ppm/°C
- WSLS series: ±50 ppm/°C (0.010Ω–1.0Ω)
- **Operating Temperature Range**: -65°C to +275°C (WSR/WSLT series), -65°C to +170°C (WSL...18 series)
- **Maximum Operating Voltage**: (P × R)^(1/2) (calculated based on power and resistance)
- **Voltage Withstand**: > 500 VAC
- **Insulation Resistance**: > 10⁹ Ω
- **Inductance**: 0.5 nH to 5 nH
- **Thermal EMF**: < 3 μV/°C
- **Mounting Method**: Surface Mount (SMD/SMT); supports reflow and infrared soldering. (The LVR series is for through-hole mounting.)
Precautions
- **Compatibility**: Please verify that the resistor is compatible with your application before purchasing. - Package Selection: 2512 is the most common SMD package; 4527 is a high-power J-Lead package; LVR is an axial-leaded package.
- Power Rating Selection: Calculate power loss (P = I²R) based on the actual sensing current and ensure a safety margin for the rated power (recommended: ≥2× actual power consumption).
- 2512 package (2W): Max sensing current approx. 11.5 A (I = √(2/0.015))
- 4527 package (2W): Max sensing current approx. 11.5 A
- 4527 package (3W): Max sensing current approx. 14 A
- 2818 package (7W): Max sensing current approx. 21 A
- Accuracy Selection: Choose ±1% or ±0.5% for high-precision current sensing applications; ±5% is suitable for general protection circuits.
- Temperature Coefficient: Prioritize WSL/WSR series (±75 ppm/°C) for high-precision or wide-temperature applications; choose WSLS series (±50 ppm/°C) for ultra-high precision.
- Automotive Applications: Prioritize AEC-Q200 certified models (e.g., WSL2512R0150FEA18, WSR2R0150FEA).
- High-Frequency Applications: Ultra-low inductance (0.5–5 nH) makes them suitable for switching power supplies and high-speed current sensing.
- **Installation Instructions**:
- Soldering Method: Supports reflow and infrared soldering; peak temperature ≤260°C, soldering duration 10–12 seconds.
- Thermal Design: Ensure sufficient PCB copper foil area for high-power applications; the WSR3 series requires a pad-to-copper connection area of ≥1050 sq. mil.
- Decoupling Capacitor: Placing an appropriate filter capacitor in parallel with the current-sensing resistor can reduce high-frequency noise.
- Kelvin Connection: A four-wire Kelvin connection is recommended for high-precision sensing to eliminate the effects of terminal resistance and solder joint TCR.
- WSR3 Package: Ensure proper circuit trace routing. ≥1050 sq. mil connection to recommended solder pads
- Operate the device within the specified temperature range
- **Troubleshooting**:
- Resistance drift/increase: Check for overheating, power overload, or aging caused by prolonged high current
- Open circuit: Check for burnout due to overcurrent, poor soldering, or mechanical damage
- Abnormal sampling voltage: Check for resistance drift, cold solder joints, or PCB copper foil detachment due to overheating
- Excessive heating: Check if actual current exceeds the rated value or if heat dissipation is inadequate
- **Alternative Model References**:
- WSL2512R0150FEA18 (2512 package, 2W, ±1%, AEC-Q200)
- WSL2010R0150FEA (2010 package, 1W, ±1%)
- WSR2R0150FEA (4527 J-Lead, 2W, ±1%)
- WSR3R0150FEA (4527 J-Lead, 3W, ±1%)
- WSHM2818R0150FEA (2818 package, 7W, ±1%)
- LVR03R0150FE12 (Axial lead, 3W, ±1%)
- LVR05R0150FE12 (Axial lead, 5W, ±1%)
- R001 (0.001 Ω), R002 (0.002 Ω), R005 (0.005 Ω), R008 (0.008 Ω), R010 (0.010 Ω), R020 (0.020 Ω), R025 (0.025 Ω), R050 (0.050 Ω), R100 (0.100 Ω), etc. (different resistance values in the same series)
- **Technical Support**: For further technical support, it is recommended to contact Vishay Dale or a professional electronic component distributor.
Summary
The DALE R015 (0.015 Ω / 15 mΩ) is a high-performance Power Metal Strip® current-sensing resistor manufactured by Vishay/Dale, featuring a resistive element made of a nickel-chrome or manganese-copper alloy and an all-welded construction. Its ultra-low resistance, high precision (±1% standard, ±0.5% optional), low temperature coefficient (±75 ppm/°C; component TCR < 20 ppm/°C), extremely low inductance (0.5–5 nH), and high power density (2W for 2512 package, 3W for 4527 package, 7W for 2818 package) make it an ideal choice for current sampling and sensing circuits. This resistor is widely used in high-precision, high-current sensing applications such as battery management systems (BMS), DC-DC converters, motor controls, power management, and automotive electronics (EPS, BMS, multimedia, climate control). Certain models are AEC-Q200 qualified, making them suitable for automotive applications. When selecting a model, calculate power loss based on the actual sensing current to ensure sufficient power rating margin, and consider factors such as package size, precision grade, temperature coefficient, and heat dissipation requirements. During implementation, a four-wire Kelvin connection is recommended to enhance sensing accuracy, and the PCB copper foil area should be sized to meet thermal dissipation needs.
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