ULR2

Metal Strip Current Sense Resistors Surface Mount ULR Series Welwyn Components • • • • • 1 watt to 3 watts, all 2512 size Resistance R0005 (0.5mΩ) to R01 (10mΩ) Low TCR, Low inductance Designed for current sensing in power electronic systems RoHS compliant Electrical Data ULR1 Power rating at 80°C Resistance range Isolation voltage TCR Resistance Tolerance Protective coating Standard Values Ambient temperature range °C 2 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 watts ohms volts ppm/°C % 1.0 R0005 to R007 200V 50, 75, 100, 150 See table below Black Green/ Black Green 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 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 (non-standard values may be available to order - consult factory) ULR2 Colour Black Black Black Black Black TCR 50 50 50 50 50 Colour ULR25 TCR Colour Green Green Green Green Green Green Green Green Green Green Green Green Green Green Green Green Green 50 50 50 50 50 50 50 50 50 50 ULR3 TCR 100 100 50 50 50 75 75 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 data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue A · 09.06 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Metal Strip Current Sense Resistors Surface Mount ULR Series Welwyn Components 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. Sn Plated Finish Cn Plating Protective Coating Ally Plate Black Type Protective Coating Metal Strip Marking For values which are integer numbers of milliohms, the marking is 4-character IEC62 code; e.g. “R002” for 2mΩ, “R010” for 10mΩ. For values including fractions of a milliohm the marking is 3 or 4character code using “M” to indicate the decimal point, e.g. “M75” for 0.75mΩ, “1M50” for 1.5mΩ. Sn Plated Finish Green Type Termination Details: Material Matt tin plated finish over a barrier layer Solderability 95% min coverage (MIL-STD 202F / 208H, 235ºC 2 secs) Performance Data Maximum Load at rated power (1000hrs cyclic load at 70°C) De-rating from rated power at 80°C Short term overload (5 x rated power for 5s) Dry heat (96Hrs, no load, +155°C) Temperature rapid change (-55 / +150ºC, 100 cycles) Resistance to solder heat (260ºC for 10s) ∆R% ∆R% ∆R% ∆R% ∆R% ±1% + 0.5mΩ (Black): ±1% (Green) See Graph ±0.5% + 0.5mΩ (Black): ±1% (Green) ±1% + 0.5mΩ (Black): ±1% (Green) ±0.5% + 0.5mΩ (Black): ±1% (Green) ±0.5% + 0.5mΩ (Black): ±1% (Green) Power de-rating graph P 100% 50% T°C 0% -55 0 80 170 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue A · 09.06 Metal Strip Current Sense Resistors Surface Mount ULR Series Welwyn Components Recommended Solder Pad Layout 1.8 4.75 1.45 0.7 3.6 1.8 4.75 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 (mΩ) 0.5mΩ, 0.75mΩ 1mΩ to 10mΩ 0.5mΩ 0.75mΩ 1mΩ 1.5mΩ 2mΩ 2.5mΩ 3mΩ 3.5mΩ 4mΩ 4.5mΩ 5mΩ 5.5mΩ 6mΩ 7mΩ 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 T L W D 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: Type Resistance value (IEC62 code) Tolerance (IEC62 code) F J 1% 5% T2 Tape 2512 ULR2 - R0025 F T2 Packing 2000 / reel © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue A · 09.06