LVK Series Four Terminal High Precision Current Sense Current sense resistors enable the measurement of current flow in a circuit by monitoring a voltage drop across a precisely cali- brated 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) FeatureS facilitates a very accurate current measurement. Ohmite’s pro- • Designed for automatic insertion prietary technology offers an excellent Temperature Coefficient of Resistance (TCR) even for very low resistance values. The • Industry standard sizes resistive element consists of a durable, anti-corrosive metal • High-precision Kelvin connect capability alloy that combines reliable performance with the ability to in a small package withstand harsh environments. SerieS SpeciFicationS Power Resistance Max. Over Current Pkg. Rating Range TCR Available Max. Max. Series Size (W @70°C) (Ω) (ppm/°C) Tolerance Values Power Current LVK12 1206 0.5W 0.01-0.100 50ppm 0.25%, 0.5%, 1% E12 20W 20A LVK20 2010 0.75W 0.01-0.05 50ppm 0.25%, 0.5%, 1% E12 29W 23A LVK24 2412 1.0W 0.01-0.100 50ppm 0.25%, 0.5%, 1% E12 38W 27A 0.001 300ppm 1% 1, 2, 3, 5, 9,10mΩ LVK25 1224 2.0W 0.002-0.004 200ppm 150W 200A 0.25% 5 & 10mΩ 0.005-0.01 100ppm characteriSticS Res. Range 0.001Ω - 0.010Ω Operating Temp. Range -40°C to +125°C Rated Ambient Temperature +70°C Resistance Tolerance 0.25%, 0.5% and 1% standard Temperature Coefficient LVK12, LVK20, LVK24: 50ppm standard LVK25: 100ppm, 200ppm, or 300ppm based on resistance value Coating Material epoxy resin Terminals 100% matte tin Max. Over Current Time applied: 10ms max. Interval: 60sec min. Max. over current = √(Max. power÷ Resistance value) or max. current, whichever is smaller. Storage conditions Temperature: 5°C ~ 35°C Humidity: 25% ~ 70% 12 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

LVK Series Four Terminal High Precision Current Sense perFormance characteriSticS Test Items Performance Requirements Test Methods / standard: JIS C 5201.1 Overload ±(0.5%+0.0005Ω) Rated voltage x 1.5 for 5s Endurance at 70°C ±(0.5%+0.0005Ω) 70°C±3°C, Rated voltage 1.5h ON, 0.5h OFF, 1000h Moisture ±(0.5%+0.0005Ω) 60°C±2°C, 90%~95% RH, Rated voltage 1.5h ON, resistance 0.5h OFF, 1000h Rapid change of ±(0.5%+0.0005Ω) -40°C (30min.)/+125°C (30min.), 5 cycles temperature Resistance to sol- ±(0.5%+0.0005Ω) 260°C±5°C for 10s±1s dering heat Substrate bending ±(0.5%+0.0005Ω) Bending width: 2mm for 10s±1s, Glass epoxy sub- strate with thickness of 1.6mm Solderability 95% or more of the electrode surface 245°C±5°C for 3s±0.5s shall be covered with new solder Reflow Temperature Profile For lead free soldering (Sn-Ag-Cu solder) 300 Peak240 ~ 260℃ Max. 10s Preheating: 130° ~ 180° 60s ~ 90s Ramp-up rate: max 3°C/sec. e °C250 Heating: Over 220° 30s ~ 90s Time above liquidous: 60 – 150 sec. atur200 Peak: 240° ~ 260° Max. 10s RMaamx.p n-duomwbne rr aotfe r: eflow: m2ax 6°C/sec. Temper150 Preheating OH3v0eesra ~2t 29in00℃sg 100 130 ~ 180℃ 60 ~ 90 sec. 50 Time (sec.) dimenSionS (mm) LVK 12, LVK20, LVK24 (0.5, 0.75 & 1 watt) LVK25 (2 watt) L a 3 1. Electrode L a Schematic 2 b 1 2. Pcoraottection b V V W 3. Almina I I substrate W V = sensing terminal 4 4. Resistor (voltage) t I = current terminal g f Layout for illustra- tion only, part can be d rotated 180° without Land Pattern t effect to the circuit. e Note that LVK25 has a vertical orientation with the current flow along the short edge of the resistor. Size L W t a b d e f g LVK12 (1206) 3.2 ±0.2 1.6 ±0.2 0.5 ±0.15 1.0 ±0.2 0.55 ±0.2 1.10 0.30 1.00 1.75 LVK20 (2010) 5.0 ±0.2 2.5 ±0.2 0.5 ±0.15 1.7 ±0.2 0.9 ±0.2 1.55 0.50 1.40 2.55 LVK24 (2412) 6.4 ±0.2 3.2 ±0.2 0.5 ±0.15 2.1 ±0.2 1.2 ±0.2 1.90 0.60 2.00 3.25 LVK25 (1224) 3.2 ±0.2 6.4 ±0.2 0.5 ±0.2 0.4 ±0.2 2.7 ±0.2 1.40 2.20 1.00 3.30 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 13

LVK Series Four Terminal High Precision Current Sense tape and reeL (mm) Tape Reel P0 Direction 13mm ±0.3 (LVK12) T D0 P2 of feed 2mm ±0.5 15mm ±0.3 (LVK 20, 24, 25) E F W 13mm ±�0.2 Series Qty/Reel B LVK12 5000 180mm ±3 60mm ±1 LVK20 1000 T2 D1 P1 A LVK24 1000 LVK12 LVK20 LVK24 LVK25 LVK25 1000 A 1.90 ±0.10 2.90 ±0.1 3.43 ±0.2 3.43 ±0.2 B 3.50 ±0.10 5.35 ±0.1 6.63 ±0.2 6.63 ±0.2 W 8.0 ±0.2 12.0 ±0.2 12.0 ±0.3 12.0 ±0.3 9mm ±0.3 (LVK12) 13mm ±0.3 (LVK 20, 24, 25) F 3.5 ±0.05 5.5 ±0.05 5.5 ±0.05 5.5 ±0.05 E 1.75 ±0.1 1.75 ±0.1 1.75 ±0.1 1.75 ±0.1 P0 4.0 ±0.1 4.0 ±0.1 4.0 ±0.1 4.0 ±0.1 P1 4.0 ±0.1 4.0 ±0.1 4.0 ±0.1 4.0 ±0.1 P2 2.0 ±0.05 2.0 ±0.05 2.0 ±0.05 2.0 ±0.05 D0 1.5 +0.1/-0 1.5 +0.1/-0 1.5 +0.1/-0 1.5 +0.1/-0 D1 1.0 +0.20/-0 1.5 +0.2/-0 1.5 +0.2/-0 1.5 +0.2/-0 T 0.2 ±0.05 0.2 ±0.05 0.2 ±0.05 0.2 ±0.05 T2 1.0 ±0.2 1.0 ±0.2 1.0 ±0.2 1.0 ±0.2 orderinG inFormation RoHS Compliant Standard values L V K 2 5 R 0 0 5 F E R LVK12 LVK20 LVK24 LVK25 LVK12 LVK20 LVK24 LVK25 LVK12 LVK20 LVK24 LVK25 0.25% Tolerance 0.5% Tolerance 1% Tolerance Series Case Size Ohms Tolerance Tape & Reel 0.001 0.01 0.01 0.01 0.001 0.01 0.01 0.01 0.001 12=1206 R005 = 0.005C = 0.25% 0.002 0.015 0.015 0.002 0.012 0.012 0.002 2204==22041102 DF == 10%.5% 0.003 0.02 0.02 0.02 0.003 0.015 0.015 0.003 25=1224 0.005 0.025 0.025 0.005 0.005 0.01 0.01 0.01 0.01 0.03 0.03 0.03 0.010 0.02 0.02 0.02 0.01 0.02 0.02 0.02 0.033 0.033 0.024 0.027 0.025 0.03 0.03 0.03 0.039 0.03 0.03 0.03 0.05 0.05 0.05 0.05 0.05 0.05 0.033 0.033 0.10 0.10 0.10 0.075 0.039 0.039 0.039 0.10 0.10 0.047 0.047 0.05 0.05 0.05 0.075 0.075 0.10 0.10 rev 3/20-1 14 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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