Elememt Kelvin Connection LVK Series Four Terminal High Precision Current Sense Current Sense Current sense resistors enable the measurement of current flow in a circuit by monitoring a voltage drop across a precisely calibrated resistance. The LVK chip features four terminals, also known as a “Kelvin” configuration. This 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. Isolating the voltage and current terminals (see schematic) facilitates a very accurate current measurement. Ohmite’s proprietary technology offers an excellent Temperature Coefficient of Resistance (TCR) even for very low resistance values. The resistive element consists of a durable, anti-corrosive metal alloy that combines reliable performance with the ability to withstand harsh environments. F e at u r e s • Designed for automatic insertion • Industry standard sizes • High-precision kelvin connect capability in a small package S e r i e s S p e c i f i c at i o n s Series LVK12 LVK20 LVK24 Pkg. Size 1206 2010 2412 Power Rating (W @70°C) 0.5W 0.75W 1.0W LVK25 1224 2.0W characteristics Resistance Range 0.001Ω - 0.05Ω Operating -40°C to +125°C Temperature Range Rated Ambient +70°C Temperature Resistance 0.5% and 1% stanTolerance dard Temperature LVK12, LVK20, LVK24: Coefficient 50ppm standard LVK25: 100ppm, 200ppm, or 300ppm based on resistance value Coating Material epoxy resin Terminals 100% matte tin Schematic V TCR (ppm/°C) Tolerance 50ppm 0.5%, 1% 50ppm 0.5%, 1% 50ppm 0.5%, 1% 300ppm 200ppm 1% 100ppm Available Values E12 E12 E12 1, 2, 3, 4, 5, 6, 7, 8, 9, 10mΩ performance characteristics Performance Test Items Requirements Overload ±(0.5%+0.0005Ω) Test Methods Rated voltage x 1.5 for 5s Endurance at ±(0.5%+0.0005Ω) 70°C 70°C±3°C, Rated voltage 1.5h ON, 0.5h OFF, 1000h Moisture ±(0.5%+0.0005Ω) resistance 60°C±2°C, 90%~95% RH, Rated voltage 1.5h ON, 0.5h OFF, 1000h Rapid change ±(0.5%+0.0005Ω) of temperature -40°C (30min.)/+125°C (30min.), 5 cycles Resistance to ±(0.5%+0.0005Ω) soldering heat 260°C±5°C for 10s±1s Substrate ±(0.5%+0.0005Ω) bending V I I V = sensing terminal (voltage) I = current terminal 2 Resistance Range (Ω) 0.01-0.05 0.01-0.05 0.01-0.05 0.001 0.002-0.004 0.005-0.01 Bending width: 2mm for 10s±1s, Glass epoxy substrate with thickness of 1.6mm Solderability 95% or more of the 245°C±5°C for 3s±0.5s electrode surface shall be covered with new solder 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] Elememt Kelvin Connection LVK Series Four Terminal High Precision Current Sense Current Sense dimensions (mm) L Land Pattern LVK25 (2 watt) W LVK 12, LVK20, LVK24 (0.5, 0.75 & 1 watt) L 2 LVK12 (1206) LVK20 (2010) LVK24 (2412) A � Series LVK12 LVK20 LVK24 LVK25 a t 3 1 Size LVK12 (1206) LVK20 (2010) LVK24 (2412) LVK25 (1224) L 3.2 ±0.2 5.0 ±0.2 6.4 ±0.2 3.2 ±0.2 W 1.6 ±0.2 2.5 ±0.2 3.2 ±0.2 6.4 ±0.2 b 1. Electrode 2. Protection coat 3. Almina substrate 4. Resistor � B t 0.5 ±0.15 0.5 ±0.15 0.5 ±0.15 0.5 ±0.2 L 1.75 2.55 3.25 1.40 W 1.10 1.55 1.90 3.30 A 1.00 1.40 2.00 2.20 B 0.30 0.50 0.60 1.00 W � � � � a 1.0 ±0.2 1.7 ±0.2 2.1 ±0.2 0.4 ±0.2 b 0.55 ±0.2 0.9 ±0.2 1.2 ±0.2 2.7 ±0.2 P0 T D0 13mm ±0.3 (LVK12) 15mm ±0.3 (LVK 20, 24, 25) 13mm ± 0.2 180mm ±3 60mm ±1 9mm ±0.3 (LVK12) 13mm ±0.3 (LVK 20, 24, 25) Direction of feed P2 E F A B W F E P0 P1 P2 D0 D1 T T2 B D1 T2 LVK12 1.90 ±0.10 3.50 ±0.10 8.0 ±0.2 3.5 ±0.05 1.75 ±0.1 4.0 ±0.1 4.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0 1.0 +0.20/-0 0.2 ±0.05 1.0 ±0.2 P1 LVK20 2.90 ±0.1 5.35 ±0.1 12.0 ±0.2 5.5 ±0.05 1.75 ±0.1 4.0 ±0.1 4.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0 1.5 +0.2/-0 0.2 ±0.05 1.0 ±0.2 RoHS Compliant LVK25R005FER LVK24 3.43 ±0.2 6.63 ±0.2 12.0 ±0.3 5.5 ±0.05 1.75 ±0.1 4.0 ±0.1 4.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0 1.5 +0.2/-0 0.2 ±0.05 1.0 ±0.2 4 Case Size 12 = 1206 20 = 2010 24 = 2412 25 = 1224 Tolerance Taping Code Ohms R005 = 0.005 D = 0.5% R = 1,000 pc/reel F = 1% Standard values LVK12 LVK20 LVK24 1% Tolerance 0.01 0.01 0.01 0.012 0.012 0.015 0.015 0.02 0.02 0.02 0.024 0.027 0.03 0.03 0.03 0.039 0.039 0.047 0.047 0.05 0.05 0.05 LVK25 0.001 0.002 0.003 0.005 0.01 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] W A ORDERIN G IN F ORMATION Series B Tape Reel 2mm ±0.5 W � t 4 b L � W a LVK25 (1224) A L LVK12 LVK20 LVK24 0.5% Tolerance 0.01 0.01 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.05 0.05 0.05 LVK25 3.43 ±0.2 6.63 ±0.2 12.0 ±0.3 5.5 ±0.05 1.75 ±0.1 4.0 ±0.1 4.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0 1.5 +0.2/-0 0.2 ±0.05 1.0 ±0.2