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 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 Power ResistanceMax. Over Current Pkg. Rating Range TCR Available Max. Max. Series Size (W @70C) () (ppm/C) Tolerance Values Power Current LVK12 1206 0.5W 0.01-0.100 50ppm 0.5%, 1% E12 20W 20A LVK20 2010 0.75W 0.01-0.05 50ppm 0.5%, 1% E12 29W 23A LVK24 2412 1.0W 0.01-0.100 50ppm 0.5%, 1% E12 38W 27A 0.001 300ppm LVK25 1224 2.0W 0.002-0.004 200ppm 1% 1, 2, 3, 5, 9,10m 150W 200A 0.005-0.01 100ppm characteristics Res. Range Operating Temp. Range Rated Ambient Temperature Resistance Tolerance Temperature Coefficient Coating Material Terminals Max. Over Current Storage conditions 12 0.001 - 0.010 -40C to +125C +70C 0.5% and 1% standard LVK12, LVK20, LVK24: 50ppm standard LVK25: 100ppm, 200ppm, or 300ppm based on resistance value epoxy resin 100% matte tin Time applied: 10ms max. Interval: 60sec min. Max. over current = (Max. power/ Resistance value) or max. current, whichever is smaller. Temperature: 5C ~ 35C Humidity: 25% ~ 70% 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 Overload Endurance at 70C Moisture resistance Rapid change of temperature Resistance to soldering heat Performance Requirements (0.5%+0.0005) (0.5%+0.0005) (0.5%+0.0005) (0.5%+0.0005) Test Methods / standard: JIS C 5201.1 Rated voltage x 1.5 for 5s 70C3C, Rated voltage 1.5h ON, 0.5h OFF, 1000h 60C2C, 90%~95% RH, Rated voltage 1.5h ON, 0.5h OFF, 1000h -40C (30min.)/+125C (30min.), 5 cycles (0.5%+0.0005) 260C5C for 10s1s Substrate bending (0.5%+0.0005) Bending width: 2mm for 10s1s, Glass epoxy substrate with thickness of 1.6mm Solderability 95% or more of the electrode surface 245C5C for 3s0.5s shall be covered with new solder Reflow Temperature Profile For lead free soldering (Sn-Ag-Cu solder) Preheating: 130 ~ 180 60s ~ 90s Heating: Over 220 30s ~ 90s Peak: 240 ~ 260 Max. 10s Ramp-up rate: Time above liquidous: Ramp-down rate: Max. number of reflow: max 3C/sec. 60 - 150 sec. max 6C/sec. 2 Temperature C 300 Peak 240 ~ 260 Max. 10s 250 200 Heating 150 Preheating 100 130 ~ 180 60 ~ 90 sec. 50 Time (sec.) dimensions (mm) L LVK25 (2 watt) W LVK 12, LVK20, LVK24 (0.5, 0.75 & 1 watt) L 2 V t t a 3 1 Size LVK12 (1206) LVK20 (2010) LVK24 (2412) LVK25 (1224) b 1. Electrode 2. Protection coat 3. Almina substrate 4. Resistor V I I V = sensing terminal (voltage) I = current terminal a 4 b Schematic W Layout for illustration only, part can be rotated 180 without effect to the circuit. L W t a b 3.2 0.2 1.6 0.2 0.5 0.15 1.0 0.2 0.55 0.2 2.1 0.2 1.2 0.2 5.0 0.2 6.4 0.2 3.2 0.2 2.5 0.2 3.2 0.2 6.4 0.2 0.5 0.15 0.5 0.15 0.5 0.2 1.7 0.2 0.4 0.2 1-866-9-OHMITE * Int'l 1-847-258-0300 * Fax 1-847-574-7522 * www.ohmite.com * info@ohmite.com 0.9 0.2 2.7 0.2 13 Over 220 30s ~ 90s LVK Series Four Terminal High Precision Current Sense dimensions (mm, continued) Land Pattern Reel L A Series LVK12 LVK20 LVK24 LVK25 L W A 2mm 0.5 W B Series Qty/Reel 1.75 1.10 1.00 0.30 LVK12 2.55 1.55 1.40 0.50 LVK20 3.25 1.90 2.00 0.60 LVK24 B 1.40 3.30 2.20 1.00 LVK25 13mm 0.2 5000 1000 1000 13mm 0.3 (LVK12) 15mm 0.3 (LVK 20, 24, 25) 180mm 3 60mm 1 1000 9mm 0.3 (LVK12) 13mm 0.3 (LVK 20, 24, 25) Tape P0 T D0 Direction of feed P2 A B E W F B W F E P0 D1 T2 P1 A P1 P2 D0 D1 T T2 LVK12 LVK20 LVK24 LVK25 1.90 0.10 2.90 0.1 3.43 0.2 3.43 0.2 8.0 0.2 12.0 0.2 12.0 0.3 12.0 0.3 3.50 0.10 3.5 0.05 1.75 0.1 4.0 0.1 4.0 0.1 2.0 0.05 5.35 0.1 5.5 0.05 1.75 0.1 4.0 0.1 4.0 0.1 2.0 0.05 6.63 0.2 5.5 0.05 1.75 0.1 4.0 0.1 4.0 0.1 2.0 0.05 6.63 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 +0.1/-0 1.5 +0.1/-0 1.5 +0.1/-0 0.2 0.05 0.2 0.05 0.2 0.05 0.2 0.05 1.0 +0.20/-0 1.0 0.2 1.5 +0.2/-0 1.0 0.2 1.5 +0.2/-0 1.0 0.2 1.5 +0.2/-0 1.0 0.2 ORDERIN G IN F ORMATION RoHS Compliant LVK25R005FER Series 14 Case Size 12 = 1206 20 = 2010 24 = 2412 25 = 1224 Tolerance Tape & Reel Ohms R005 = 0.005 D = 0.5% 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 0.025 0.03 0.03 0.03 0.033 0.033 0.039 0.039 0.039 0.047 0.047 0.05 0.05 0.05 0.075 0.075 0.10 0.10 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 * info@ohmite.com LVK12 LVK20 LVK24 0.5% Tolerance 0.01 0.01 0.01 0.015 0.015 0.02 0.02 0.02 0.025 0.025 0.03 0.03 0.03 0.033 0.033 0.039 0.05 0.05 0.05 0.075 0.10 0.10 LVK25 0.001 0.002 0.003 0.005 0.010 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Ohmite: LVK25R010FER LVK12R010DER LVK24R015FER LVK20R015FER LVK25R003FER LVK24R012FER LVK12R012FER LVK24R030FER LVK20R030FER LVK24R020DER LVK12R020FER LVK20R020DER LVK24R030DER LVK12R050DER LVK25R001FER LVK20R030DER LVK20R050FER LVK25R005FER LVK20R027FER LVK24R050FER LVK12R030FER LVK24R050DER LVK12R030DER LVK24R039FER LVK20R039FER LVK24R047FER LVK25R002FER LVK20R050DER LVK24R020FER LVK20R020FER LVK12R047FER LVK12R010FER LVK12R050FER LVK20R010DER LVK12R020DER LVK12R024FER LVK24R010DER LVK20R010FER LVK24R010FER LVK25R010DER LVK12R033FER LVK24R025FER LVK12R075DER LVK24R075FER LVK24R033FER LVK24R033DER LVK24R025DER LVK24R015DER LVK20R025DER LVK12R075FER LVK12R039FER LVK12R039DER LVK25R001DER LVK20R015DER LVK25R002DER LVK12R033DER LVK25R003DER LVK25R005DER LVK24R039DER LVK24R100FER LVK12R100FER LVK12R015DER LVK12R100DER LVK24R100DER