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| Metal Strip Current Sense Resistors Surface Mount ULR Series * * 1 watt to 3 watts, all 2512 size Resistance R0005 (0.5m) to R01 (10m) Low TCR, Low inductance Designed for current sensing in power electronic systems RoHS compliant * * * Electrical Data ULR1 Power rating at 80C Resistance range Isolation voltage TCR Resistance Tolerance Protective coating 2 Standard Values Ambient temperature range 1 ULR2 2.0 R0005 to R01 200V 50 1(F), 5(J) ULR25 2.5 R0035 to R006 200V 50 ULR3 3.0 R0005 to R003 200V 50, 75, 100 See table below Green watts ohms volts ppm/C % 1.0 R0005 to R007 200V 50, 75, 100, 150 See table below Black C Green/ Black Green See table below for available values -55 to +170 Note 1: For values above 0R01 refer to our LR / LRF Series Note 2: Colour of coating relates to solder process suitability, see Construction Standard values available (non-standard values may be available to order - consult factory) ULR1 Value R0005 R00075 R001 R0015 R002 R0025 R003 R0035 R004 R0045 R005 R0055 R006 R007 R008 R009 R01 Colour Black Black Black Black Black Black Black Black Black Black Black Black Black Black TCR 50 50 50 50 50 150 150 150 100 100 100 100 75 75 ULR2 Colour Black Black Black Black Black TCR 50 50 50 50 50 ULR25 Colour TCR ULR3 Colour Green Green Green Green Green Green Green TCR 100 100 50 50 50 75 75 Green Green Green Green Green Green Green Green Green Green 50 50 50 50 50 50 50 50 50 50 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own test data and is considered accurate at time of print. (c)Welwyn Components Limited A subsidiary of TT electronics plc Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Construction Black type A low TCR resistance alloy plate, with plated connection bands is protectively coated and numerically marked with the resistance value. This part has standard plated end connections and is suitable for wave or IR reflow soldering. Green type A low TCR resistance alloy plate is grooved to set the final resistance, the lower faces are solder plated for connections, and it is protectively coated and numerically marked with the resistance value. This part is ONLY suitable for IR reflow soldering. Marking For values which are integer numbers of milliohms, the marking is 4-character IEC62 code; e.g. "R002" for 2m, "R010" for 10m. For values including fractions of a milliohm the marking is 3 or 4-character code using "M" to indicate the decimal point, e.g. "M75" for 0.75m, "1M50" for 1.5m. Sn Plated Finish Sn Plated Finish Black type Termination Details: Material Solderability Matt tin plated finish over a barrier layer Green type 95% min coverage (MIL-STD 202F / 208H, 235C 2 secs) Performance Data Load at rated power (1000hrs cyclic load at 70C) De-rating from rated power at 80C Short term overload (5 x rated power for 5s) Dry heat (96Hrs, no load, +155C) Temperature rapid change (-55 / +150C, 100 cycles) Resistance to solder heat (260C for 10s) Power de-rating graph P 100% R% R% R% R% R% Maximum 1% + 0.5m (Black): 1% (Green) See Graph 0.5% + 0.5m (Black): 1% (Green) 1% + 0.5m (Black): 1% (Green) 0.5% + 0.5m (Black): 1% (Green) 0.5% + 0.5m (Black): 1% (Green) 50% TC 0% -55 0 80 170 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own test data and is considered accurate at time of print. (c)Welwyn Components Limited A subsidiary of TT electronics plc Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Recommended Solder Pad Layout 1.8 1.45 0.7 4.75 1.8 4.75 3.6 4-wire pad layout (recommended for precision current sensing) 2-wire pad layout Dimensions (mm) Type Green Green Black Black Black Black Black Black Black Black Black Black Black Black Black Black Values (m) 0.5 m, 0.75m 1m to 10m 0.5m 0.75m 1m 1.5m 2m 2.5m 3m 3.5m 4m 4.5m 5m 5.5m 6m 7m L 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 W 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 3.18 T 1.00 0.60 1.40 1.00 0.80 0.65 0.50 1.00 0.70 0.71 0.60 0.58 0.50 0.47 0.50 0.45 D 1.93 1.93 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 1.30 Nom. Wt. (g) 0.09 0.08 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 D W L T Flammability The resistor will not burn or emit incandescent particles under any condition of applied temperature or overload. Solvent resistance The body protection and marking are resistant to all normal industrial solvents suitable for printed circuits. Packaging The standard packing for ULR parts is on a 2000 piece reel of size 12mm tape Ordering Procedure Example: ULR2 at 2.5 milliohms and 1% tolerance on reel of 2000 pieces: ULR2-R0025FT2 Type Value (use IEC62 code) Tolerance (use IEC62 code) F J 1% 5% Packing T2 Tape 2512 2000 / reel General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own test data and is considered accurate at time of print. (c)Welwyn Components Limited A subsidiary of TT electronics plc Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com |
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