LVT Series Low Value Current Sense The Ohmite LVT series is s metal alloy strip resistor providing good TCR ratings. Low value stability is important when using a current sense resistor. The LVT offers TCR ratings down to 50ppm with tolerances down to 1%. The LVT series provides a resistance range from 2m to 20m ohms. TCR stability with tight tolerances and wide resistance range makes the LVT series suited for most current sense applications. SerieS Specifica TionS Power Resistance Pkg. Rating Range TCR Series Size (W 70C) (m) (ppm/C) Tolerance LVT04 0402 0.33W 2.5 150 3% (H) 3 ~ 4 150 2% (G) 5 ~ 20 100 1% (F) LVT06 0603 0.33W 2 150 3% (H) 3 ~ 4 150 2% (G) 5 ~ 20 100 1% (F) LVT08 0805 0.5W 2 100 3% (H) 3 100 2% (G) 4 75 2% (G) 5 ~ 10 75 1% (F) 11 ~ 20 50 1% (F) LVT12 1206 1.0W 2 100 3% (H) 3 100 2% (G) 4 75 2% (G) 5 ~ 10 75 1% (F) 11 ~ 20 50 1% (F) characTeriSTicS Res. Range 0.002- 0.020 dependent on size and TCR value Derating Operating Temp. Range -55 ~ 155 Power rating is based on continuous full load operation at rated ambient Rated Ambient Temperature +70C temperature of 70C. For resistors operated at ambient temp. in excess 3%, 2% and 1% based on resistance value Resistance Tolerance of 70 C, the max. load shall be der- ated in accordance with the following Temperature Coefficient 150, 100, 75, or 50 ppm based on resistance curve. Coating Material epoxy resin 100 Terminals 100% matte tin -55 70 80 Storage conditions 2 years airtight, +10 ~ 40, relative humid- 60 ity 75%. Without dew, +10 ~ 60, relative 40 humidity 95%, maximum value for 30 days. 155 20 Construction 0 -60 -20 20 60 100 140 180 Epoxy resin marking Ambient Temperature (C) Epoxy substrate Epoxy adhesive Cu-alloy resistor Protective coating: Cu flame-retardant epoxy, Ni meets UL- 94-V0 requirements Sn Electrode (Cu+Ni+Sn) 12 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com % Rated PowerLVT Series Low Value Current Sense performance characTeriSTicS Parameter Condition Requirement 2.5Pr 52C, 5sec. (1.0%+0.5m) Short Time Overload IEC60115-1 4.13 +1552C, 1000h (1.0%+0.5m) High Temp. Exposure IEC60115-1 4.25 -552C, 1000h (1.0%+0.5m) Low Temp. Storage IEC60115-1 4.25 60C, 95% RH Vtest = Vmax 602C (2.0%+0.5m) Moisture Load Life RH=95% 90min ON, 30min OFF, 1000h IEC60115-1 4.25 -55C 30min., R.T. 3min.. +155C 30min., (1.0%+0.5m) Thermal Shock R.T. 3min, 100 Cycles IEC60115-1 4.19 Vtest = Vmax 702C 90min ON, 30min (2.0%+0.5m) Load Life at 70C OFF, 1000h IEC60115-1 4.25 Dip into solder at 245 5C, 30.5sec., covered area 95% Solderability IEC60115-1 4.17 Through Reflow, 275 5C, 20 1sec. (1.0%+0.5m) Resistance to Solder Heat IEC60115-1 4.18 100G, 11ms, 5x (1.0%+0.5m) Mechanical Shock IEC60115-1 4.21 Span between fulcrums 90mm Bend (1.0%+0.5m) Substrate Bending Width 2mm Test board Glass-Epoxy IEC60115-1 4.33 Board Thickness 1.6mm SoLdering Wave Reflow 300 300 Soldering 10 sec. Soldering 250 250 Preheating Preheating Cooling -5K/s 200 200 -3.5K/s 200K/s -2K/s 150 Cooling 150 100 100 50 2K/s 50 0 0 50 100 150 200 250 30 ~ 90 10~20 120 Time (sec.) Time (sec.) Preheating : 100C ~ 130C, max.100 sec. Preheating : 145C 15, max.120 sec. Soldering: 250C ~ 265C max. 10 sec. Soldering : min. 220C, max. 60 sec. Maximum temperature : 260C 5, max. 10 sec. Maximum temperature : 260C 5, max. 10 sec. Rework temperature (hot air equipment) 350, 3 ~ 5 seconds Recommended reflow methods IR, vapor phase oven, or hot air oven. If reflow temperatures exceed the recom- mended profile, devices may not meet the performance requirements. 1-866-9-OHMITE Intl 1-847-258-0300 Fax 1-847-574-7522 www.ohmite.com info ohmite.com 13 Temperature C Temperature C