LVK Series L Four Terminal High Precision Current Sense LVK25 (2 watt) W LVK 12, LVK20, LVK24 (0.5, 0.75 & 1 watt) L 2 W t a 4 t a b Series LVK12 LVK20 LVK24 LVK25 1 Pkg. Size 1206 2010 2412 Power Rating (W @70°C) 0.5W 0.75W 1.0W 1224 2.0W 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 b 1. Electrode 2. Protection coat 3. Almina substrate 4. Resistor 3 TCR (ppm/°C) 50ppm 50ppm 50ppm 300ppm 200ppm 100ppm Available Tolerance Values 0.5%, 1% E12 0.5%, 1% E12 0.5%, 1% E12 1, 2, 3, 4, 1% 5, 6, 7, 8, 9, 10 mΩ 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. 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 t 0.5 ±0.15 0.5 ±0.15 0.5 ±0.15 0.5 ±0.2 b 0.55 ±0.2 0.9 ±0.2 1.2 ±0.2 2.7 ±0.2 � Series LVK12 LVK20 LVK24 LVK25 W � 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 B 0.30 0.50 0.60 1.00 W � � � � B Reel (mm) 2mm ±0.5 13mm ±0.3 (LVK12) 15mm ±0.3 (LVK 20, 24, 25) 13mm ± 0.2 180mm ±3 sch e m at i c V V I I V = sensing terminal (voltage) I = current terminal LVK25R005FER Series 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% Sta n d ar d v a l u e s L � Resistance Range: 0.001Ω - 0.05Ω Operating Temperature Range: -40°C to +125°C Rated Ambient Temperature: +70°C Resistance Tolerance: 0.5% and 1% standard Temperature Coefficient: LVK12, LVK20, LVK24: 50ppm standard LVK25: 100ppm, 200ppm, or 300ppm based on resistance value Terminals: 100% matte tin Check product availability at www.ohmite.com LVK25 (1224) A L � S p e c i f i cat i o n s RoHS Compliant a 1.0 ±0.2 1.7 ±0.2 2.1 ±0.2 0.4 ±0.2 l a n d P att e r n ( m m ) LVK12 (1206) LVK20 (2010) LVK24 (2412) A • Designed for automatic insertion • Industry standard sizes • High-precision kelvin connect capability in a small package O R DE R IN G IN F O R M A T ION dimensions (mm) Size LVK12 (1206) LVK20 (2010) LVK24 (2412) LVK25 (1224) F e at u r e s LVK12 LVK20 LVK24 LVK25 1% Tolerance 0.01 0.01 0.01 0.001 0.012 0.012 0.002 0.015 0.015 0.003 0.005 0.02 0.02 0.02 0.024 0.027 0.03 0.03 0.03 0.01 0.039 0.039 0.047 0.047 0.05 0.05 0.05 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 60mm ±1 9mm ±0.3 (LVK12) 13mm ±0.3 (LVK 20, 24, 25) Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 1