LVR vishay dale www.vishay.com 120 document number 30206 revision 18-sep-02 for technical questions, contact ww2aresistors@vishay .com features ? ideal for all types of current sensing applications including switching and linear power supplies, instruments and power amplifiers ? proprietary processing technique produces extremely low resistance values ? excellent load life stability ? low temperature coefficient ? low inductance ? cooler operation for high power to size ratio wirewound resistors, precision power, low value, commercial, military, mil-prf-49465 type rlv, axial lead standard electrical specifications *resistance is measured 3/8" [9.52mm] from the body of the resistor, or at 1.183" [30.05mm], 1.315" [33.40mm], 1.675" [42.545mm ] or 2.575" [65.405mm] spacing for the LVR-1, LVR-3, LVR-5 and LVR-10 respectively. **standard resistance values are 0.01 ? , 0.015 ? , 0.02 ? , 0.025 ? , 0.03 ? , 0.033 ? , 0.04 ? , 0.05 ? , 0.051 ? , 0.06 ? , 0.068 ? , 0.07 ? , 0.08 ? , 0.09 ? and 0.1 ? with 1% tolerance. other resistance values may be available upon request. model mil-prf-49465 power rating resistance range* technology p 25 c ? type w 1%, 3%, 5%, 10% LVR-1 1 0.01 - 0.1** metal strip LVR-3 3 0.005 - 0.2 metal strip LVR-3-26 rlv30 (m4946506) 3 0.01 - 0.2 metal strip LVR-5 5 0.005 - 0.3 metal strip LVR-5-26 rlv31 (m4946507) 5 0.01 - 0.3 metal strip LVR-10 10 0.01 - 0.8 coil spacewound ordering information LVR-3 0.05 ? 1.0% model resistance tolerance ? % parameter unit LVR-1 LVR-3 LVR-5 LVR-10 rated power at + 25 cw 1 3 5 10 operating temperature range c - 65/ + 175 - 65/ + 275 dielectric withstanding voltage v ac 1000 1000 1000 1000 insulation resistance ? 10,000 megohms minimum dry short time overload - 5 x rated power for 5 seconds 10 x rated power for 5 seconds terminal strength (minimum) lb 5 10 10 10 temperature coefficient ppm/ c see tc vs resistance value chart maximum working voltage v (p x r) 1/2 weight (maximum) g 2 2 5 11 technical specifications
www.vishay.com 121 LVR vishay dale document number 30206 revision 18-sep-02 for technical questions, contact ww2aresistors@vishay .com dimensions model dimensions in inches [millimeters] ab c 0.010 [0.254] 0.010 [0.254] 0.002 [0.051] LVR-1 0.427 [10.85] 0.115 [2.92] 0.020 [0.508] LVR-3 0.560 [14.22] 0.205 [5.21] 0.032 [0.813] LVR-5 0.925 [23.50] 0.330 [8.38] 0.040 [1.02] LVR-10 1.828 [46.43] 0.392 [9.96] 0.040 [1.02] 1.50 [38.10]* minimum a c b wirewound resistors, precision power, low value, commercial, military, mil-prf-49465 type rlv, axial lead *on some standard reel pack methods, the leads may be trimmed to a shorter length than shown. - 65 - 25 25 75 125 175 225 275 ambient temperature in c 120 100 80 60 40 20 0 rated power in % LVR-1 LVR-3 LVR-5 LVR-10 derating material specifications element: self-supporting nickel-chrome alloy (LVR-10 also utilizes manganin) encapsulation: high temperature mold compound terminals: tinned copper part marking: dale, model, wattage, value, tolerance, date code the improved tc characteristics of these LVR models from - 55 c to + 125 c (referenced to + 25 c) are as follows: 20 40 60 80 100 resistance ( ? x 10 -3 ) LVR-5 400 300 200 100 tc in ppm/ c LVR-3 LVR-1 tc vs resistance value LVR-10 12 3 4 567 8 910 250 200 150 100 50 surface temperature in c power in w LVR-3 LVR-1 surface temperature vs power LVR-5 LVR-10 test conditions of test (mil-prf-49465) test limits thermal shock - 65 c to + 125 c, 5 cycles, 15 minutes at each extreme (0.2% + 0.0005 ? ) ? r short time overload 5 x rated power (LVR-1, -3, -5), 10 x rated power (LVR-10) for 5 seconds (0.5% + 0.0005 ? ) ? r low temperature storage - 65 c for 24 hours (0.2% + 0.0005 ? ) ? r high temperature exposure 250 hours at + 275 c (+ 175 c for LVR-1) (2.0% + 0.0005 ? ) ? r dielectric withstanding voltage 1000v rms, one minute (0.1% + 0.0005 ? ) ? r insulation resistance mil-std-202 method 302, 100 volts 1000 m ? minimum moisture resistance mil-std-202 method 106, 7b not applicable (0.2% + 0.0005 ? ) ? r shock, specified pulse mil-std-202 method 213, 100g's for 6 milliseconds, 10 shocks (0.1% + 0.0005 ? ) ? r vibration, high frequency frequency varied 10 to 2000hz, 20g peak, 2 directions 6 hours each (0.1% + 0.0005 ? ) ? r load life 2000 hours at rated power, + 25 c, 1.5 hours on, 0.5 hours off (2.0% + 0.0005 ? ) ? r solderability ansi j-std-002 95% coverage bias humidity + 85 c, 85% rh, 10% bias, 1000 hours (1.0% + 0.0005 ? ) ? r performance
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