TOKEN LRD Open Air Four-terminal Resistors Four-terminal Open Air Resistors Token’s Open Air Four-terminal resistors (LRD) tackle current sensing applications Preview Always preferred in current sense applications, Token’s LRD Series range is available in the 1W, 3W, 5W, 7W and 10W packages, resistance values down to 0.001 ohm, with tolerances as tight as 0.50% and TCRs of 50ppm standard. The Kelvin (four-terminal) configuration enables current to be applied through two opposite terminals and a sensing voltage to be measured across the other two terminals, eliminating the resistance and temperature coefficient of the terminals for a more accurate current measurement. With up to 10W power rating and TCRs as low as 50ppm/°C, the LRD Series resistors deliver excellent performance, making them ideal for a variety of applications. The resistor is constructed using a low-resistance, low-inductance, high-impulse proprietary metal element that gives the device its extended power and temperature ratings. Continually upgrading its resistors to take advantage of modern technologies and manufacturing methods, Token is now able to offer complete ranges of products which meet the RoHS requirements and in addition to detailing these, the component selector also provides designers with a comprehensive selection of application notes. The LRD devices can be manufactured to custom length/width for use as a current shunt. Token will also produce outside these specifications to meet customer requirements. Contact us with your specific needs. Features Applications - Low inductance. - 4 leads for Kelvin connection. - Decimal marked, silicone coated. - Tinned copper terminal for easy soldering. - Radial, self-supporting, design is ideal for PC board mounting. Version 2010 http://www.token.com.tw/ - Surge/Pulse Applications. - Current Sensing Application. - Feed Back & Motor Control. - High Precision Measurement Instrumentation. rfq token.com.tw 01 of 03 TOKEN LRD Open Air Four-terminal Resistors Specification & Dimensions (Unit: mm) LSQ-A L W H P Type LRD-1 LRD-3 LRD-5 LRD-7 LRD-10 Rating Wattage 1W 3W 5W 7W 10W d Resistance Range (mΩ) 1 ~ 10 mΩ 1 ~ 10 mΩ 0.5 ~ 5 mΩ 0.3 ~ 3 mΩ 0.1 ~ 1 mΩ Tolerance (%) D(±0.5%) F(±1%) G(±2%) J(±5%)s TCR (ppm/°C) ±50 ppm/°C ±100 ppm/°C Power Derating Curve Power Derating Curve Rated Load (%) 120 100 80 60 40 20 0 -55 -25 25 40 70 125 175 Ambient Temperature (℃) 02 of 03 http://www.token.com.tw/ rfq token.com.tw Version 2010 TOKEN LRD Open Air Four-terminal Resistors Characteristic Specification KELVIN ELECTRICAL CONNECTION R 1 4 3 2 TERMINALS 2 & 3 CURRENT TRACES. TERMINALS 1 & 4 SENSE TRACES. Test Items Operating Temperature Range Maximum Working Voltage Terminal Tensile Strength Withstand Voltage Short Time Overload Thermal Shock Load Life Test Method Specification -55°C ~ 125°C (P40°C x R)1/2 50N, 10s ΔR≤±1.0%R 1000V, 1 Min. No damage on the appearance. 5 times rated power, 5s ΔR≤±4.0%R -55°C~+125°C, 5 cycles, 30 min. ΔR≤±5.0%R 70°C, 1000h 1.5 hours on, 0.5 hours off. ΔR≤±5.0%R How to Order LRD 5 R005 F P Part Number: LRD Rated power Code 1 3 5 7 10 Tolerance % Rated power 1 Watt 3 Watt 5 Watt 7 Watt 10 Watt R05 R1 Tolerance % D F G J ±0.5% ±1% ±2% ±5% Package-Code Resistance Value (Ω) Code R005 Code Resistance Value (Ω) Code Package-Code P Bulk 0.005Ω 0.05Ω 0.1Ω Back to 1st Page - Open Air Four-terminal Resistors (LRD) Version 2010 http://www.token.com.tw/ rfq token.com.tw 03 of 03