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SURFACE MOUNT RESISTORS
LR Series: Metal Alloy, Very Low-Resistance
INTRODUCTION
RFE International, Inc. LR Series of low resistance Surface Mount Resistors are ideal for applications where low resistance, tight tolerance and temperature stability is important. Current sense, power supply, Industrial controls, are a few of the applications suitable for this series of resistor.
RoHS
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APPLICATIONS
* * * * * * * * Power Supply Battery Pack DIY Tools Inverter / Converter (AC/DC, DC/DC, DC/AC) Test Equipment Precision Measuring Equipment LED Driver Automotive
PERFORMANCE
Test Item Thermal Shock Solderability test Low Temperature Storage High Temperature Exposure Bias Humidity Mechanical Shock Vibration Load Life Conditions of test -55 C to +125 C, 1000 cycles, 15 minutes at each extreme Steam aging: 4hrs, cool down 30 minutes then test -55C for 1000 hours 1000 hours @ +155 C +85 C, 85% RH, 10% Bias, 1000 hours, 90 minutes "ON", 30 minutes "OFF" 100 grams for 6 milliseconds, 5 pulses Frequency varied 55Hz in one minute, 3 directions, 12 hours 1000 hours @ rated power, +100 C, 1.5 hours "ON", 0.5 hours "OFF" Test Method JIS C5202 7.4 JIS C5202 6.5 JIS C5202 7.1 JIS C5202 7.2 JIS C5202 7.9 JIS C5202 6.13 JIS C5202 6.7 JIS C5202 7.10 JIS C5202 6.4 JIS C5202 7.6 JIS C5202 6.9
Resistance to Solder Solder temp./immersion time: 260+5 C, 10+1secs and 350+10 C Heat 3.5+0.5secs Moisture Resistance Resistance to solvent Mil-STD-202, Method 106, 0% power, 7a and 7b not required Immersion time: 60+5 secs, 20 C~25 C y
DIMENSIONS
DIMENSIONS Model LR1WMR (1206) LR1WSR (2010) LR1WR, LR1.5WR, LR2WR, LR3WSR (2512) Resistance Range my(c) W 1~50 0.5~3 4~100 0.5~4 4.1~100 0.25, 0.5 1 1.5 2 2.5 3 LR3WR, LR3.5WR, LR4WR (2728) 0.268y .010 0 (6.8y .254) 0 0.264y .010 0 (6.7y .254) 0 0.039y .010 0 (1.0y .254) 0 0.043y .010 0 (1.1y .254) 0 0.039y .010 0 (1.0y .254) 0 L 0.12y .010 0 (3.15y .254) 0 0.20y .010 0 (5.10y .254) 0 W 0.062y .010 0 (1.60y .254) 0 0.10y .010 0 (2.54y .254) 0 H 0.029y .010 0 (0.750y .254) 0 0.031y .010 0 (0.8y .254) 0 T 0.02y .010 0 (0.50y .254) 0 0.051y .010 0 (3.15y .254) 0 0.031y .010 0 (0.8y .254) 0 0.074y .010 0 (1.88y .254) 0 0.044y .010 0 (1.13y .254) 0 0.085y .010 0 (2.15y .254) 0 0.085y .010 0 (2.15y .254) 0 0.085y .010 0 (2.15y .254) 0 0.071y .010 0 (1.8y .254) 0 0.065y .010 0 (1.65y .254) 0 0.051y .010 0 (1.3y .254) 0 0.045y .010 0 (1.15y .254) 0 0.063(1.60) 0.011(1.80) 0.009(2.29) 0.120(3.05) 0.083(2.11) 0.086(2.18) 0.115(2.92) 0.115(2.92) 0.145(3.68) 0.145(3.68) a b
Inch (mm)
SOLDER PAD DIMENSIONS i 0.026(0.66) 0.048(1.22) 0.095(2.41) 0.050(1.27) 0.125(3.18)
0.246y .010 0 (6.25y .254) 0
0.13y .010 0 (3.30y .254) 0
0.031y .010 0 (0.8y .254) 0
LR4WSR (2725)
0.125(3.2)
0.27(6.9)
0.052(1.32)
0.035y .010 0 (0.9y .254) 0
4~100
0.264y .010 0 (6.7y .254) 0
0.283y .010 0 (7.2y .254) 0
0.039y .010 0 (1.0y .254) 0
0.108(2.75)
0.308(7.8)
0.136(3.5)
RFE International * Tel:(949) 833-1988 * Fax:(949) 833-1788 * E-Mail Sales@rfeinc.com
C2BB05 REV.2009.3.3
SURFACE MOUNT RESISTORS
LR Series: Metal Alloy, Very Low-Resistance
TEMP. COEFFICIENT
Type LR1WMR (1206) LR1WSR (2010) Resistance Range 1 ~ 4my(c) W W 4.1 ~ 15my(c) W 15.1 ~ 50my(c) 0.5 ~ 3my(c) W 3.1 ~ 6.9my(c) W 7 ~ 100my(c) W Temp. Coeff. (PPM / C) 50 -25 -15 50 -25 -15 50 -25 50 -25 50 -25 -25 -15 -25 -15
100
RoHS
u
DERATING CURVE
Operating Temp. Range -65C ~ +275C
Rated Load (%)
80 60 40 20 0 -55 -30 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 275 C
LR1WR, W 0.5 ~ 3my(c) LR1.5WR, LR2WR 3.1 ~ 6.9my(c) W (2512) LR3WSR (2512) LR4WSR (2725) LR3WSR, LR3.5WR (2728) LR4WR (2728) 0.5~1.5my(c) W 1.6~10my(c) W
W 0.25~0.9my(c) W 1~3my(c) W 4~7my(c) W 7.1~100my(c) W 4~7my(c) W 7.1~50my(c)
Ambient Temperature (C)
RATINGS & STANDARD RANGES
Item Power Max. Max. Rating at Rating Overload 100y C Current Current (Watts) 1 1 1 1.5 2 3 3 3.5 4 31.62A 44.72A 44.72A 54.77A 63.25A 77.46A 27.39A 29.58A 31.62A 126.49A 178.89A 223.61A 273.86A 252.98A 232.38A 82.16A 88.74A 126.49A 4~50 4~50 4~50 7~75 7~10 4~100 0.5~75 0.5~10 4~100 0.5~75 0.5~10 4~100 Resistance Range mW 0.5% (D) 7~50 3~100 1% (F) 1~50 0.5~100 5% (J) 1~50 0.5~100
m OHM TO OHMS
(m = milli) 100mW = 0.1W 150mW = 0.05W 155mW = 0.005W 0.5mW = 0.0005W
LR1WMR (1206) LR1WSR (2010) LR1WR, LR1.5WR (2512) LR2WR, LR3WSR (2512) LR3WR, LR3.5WR (2728) LR4WSR (2725), LR4WR (2728)
7~100
0.5~100
0.5~100
PACKAGING
Size 1206 2010 2512 2725 2728 Reel Tape Width 8mm/Embossed Plastic 12mm/Embossed Plastic 12mm/Embossed Plastic 12mm/Embossed Plastic 12mm/Embossed Plastic Diameter 178mm/7" 178mm/7" 178mm/7" 178mm/7" 178mm/7" Pieces/Reel 2,000 2,000 1,000 1,000 1,000
PART NUMBER EXAMPLE
LR1WSR - R05 - J
C2BB05 REV.2009.3.3
RFE International * Tel:(949) 833-1988 * Fax:(949) 833-1788 * E-Mail Sales@rfeinc.com

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