Metal Strip Current Sense Resistors _. Surface Mount i FTelectronics *enas* P ROV | Sl O NA L Welwyn Components Limited ULR Series ULR1, ULR2, ULR3 all 2512 sizes ULR1S 1206 size, 5S 2010 size Resistance 20008 (Hey to R01 (10m) Low TCR, Low inductance Designed for current sensing in power electronic systems RoHS compliant ee e @ @ @ Electrical Data ULR1S ULR1 ULR15S ULR2 ULR25 ULR3 Power rating at 80C watts 1.0 1.0 145 2.0 2.5 3.0 1 RO005 to RO005 to RO0035 to ROO005 to Resistance range ohms ROO1 toRO1 ROI ROO1 to RO1 RO1 ROOG R003 Isolation voltage volts 200V 200V 200V 200V 200V 200V ppm/ " oh 00, 50, 75, 100 TCR 50 50 50 50 See table Cc See table alow below Resistance Tolerance % 1(F), 5(J) Protective coating 7 Green Black Green | Black/Green i Green Green Standard Values See table below for available values Ambient temperature # range Cc -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) Value ULR1S ULR1 ULR15S ULR2 ULR25 ULR3 Colour | TCR | Colour | TCR | Colour | TCR | Colour | TCR | Colour | TCR | Colour | TCR ROOO05 Black 50 Black 50 Green | 100 ROO075 Black 50 Black 50 Green | 100 R001 Green 50 Black | 50 | Green | 50 | Black | 50 Green | 50 | ROO15 Green 50 Black 50 Green 50 Black 50 Green 50 R002 Green 50 Black 50 | Green | 50 Black 50 Green | 50 RO025 Green 50 Black 150 | Green 50 Green 15 _ROQ03 Green 50 Black | 150 | Green | 50 | Green | 75 RO035 Green 50 Black | 150 | Green | 50 Green | 50 R004 Green 50 Black | 100 | Green | 50 | _ Green | 50 _ RO045 Green 50 Black | 100 | Green | 50 Green | 50 ROOS Green 50 Black | 100 | Green | 50 Green | 50 ROO55 Green 50 | Black | 100 | Green | 50 Green | 50 ROO6 Green 50 Black 75 | Green | 50 Green | 50 ROO7 Green 50 Black | 75 | Green | 50 | Green | 50 = ROO8 Green 50 Green | 50 | Green 50 ROO9 Green 50 Green | 50 | Green 50 RO1 Green | 50 | Green | 50 | Green | 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. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Construction Fe a ec ia a Black type Welwyn Components Limited 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. ROO2 for 2mQ, RO10 for 10mQ. For values including fractions of a millionm the marking is 3 or 4-character code using M" to indicate the decimal point, e.g. M75 for 0.75mQ, 1M50 for 1.5mQ. Sn Plated Finish Probactive Coating cu Plating Metal Strip Protective Coating Alloy Plate * Sn Plated Finish Black type Green type Termination Details: Material Matt tin plated finish over a barrier layer Solderability 95% min coverage (MIL-STD 202F / 208H, 235C 2 secs) Performance Data | Maximum : Load at rated power (1000hrs cyclic load at 70C) AR% 1% + 0.5mO (Black): +1% (Green) _ | De-rating from rated power at 80C See Graph Short term overload (5 x rated power for 5s) AR% 40.5% + 0.5mQ (Black): +1% (Green) Dry heat (96Hrs, no load, +155C) AR% +1% + 0.5mO (Black): +1% (Green) Temperature rapid change (-55 / +150C, 100 cycles) AR% | _ +0.5% + 0.5mO (Black): +1% (Green) _ Resistance to solder heat (260C for 10s) AR% +0.5% + 0.5mQ (Black): +1% (Green) Power de-rating graph Pp A 100% 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 Welwyns own test data and is considered accurate at time of print. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com Se Pee eee eee ee eee eee ee eee eee a -" Welwyn Components Limited Recommended Solder Pad Layout for precision current sensing. 2-wire pad layout. - Bp + Mounting Type A B Cc 2512 475 | 18 | 36 ey 2010 3.8 | 1.44 | 3.12 G 1206 2.375 | 0.9 | 1.95 4-wire pad layout. <> Mounting Type A B e D 2512 4.75 | 1.8 | 36 | 0.7 D v a. = 2010 38 | 1.44|312| 1.16 | et 1206 2.375 | 0.9 | 1.95 | 0.725 Dimensions (mm) Size Type | Values (mQ) L Ww T D_ | Nom. Wt. (g) | 2512 | Green | 0.5mQ-0.75mQ | 6.35 | 3.18 | 1.00 | 1.93 0.09 a Si 2512 | Green 1mQ - 22mQ 6.35 | 3.18 | 0.60 | 1.93 0.08 2512 | Black 0.5mQ 6.35 | 3.18 | 1.40 | 1.30 0.06 2512 | Black 0.75mQ __| 6.35 | 3.18 | 1.00 | 1.30 0.06 | 2512 | Black 1imQ 6.35 | 3.18 | 0.80 | 1.30 0.06 2512 | Black 1.5mQ 6.35 | 3.18 | 0.65 | 1.30 0.06 2512 | Black 2mQ [6.35 | 3.18 | 0.50 | 1.30 0.06 | 2512 | Black 2.5m 6.35 | 3.18 | 1.00 | 1.30 0.06 + q_ 5 | 2512 | Black 3mQ 6.35 | 3.18 | 0.70 | 1.30 0.06 CT] | 2512 | Black 3.5mO 6.35 | 3.18 | 0.71 | 1.30 0.06 ; (2512 | Black 4mQ 6.35 | 3.18 | 0.60 | 1.30 0.06 4 | 2512 | Black 4.5mQ 6.35 | 3.18 | 0.58 | 1.30 0.06 "2512 | Black 5mQ 6.35 | 3.18 | 0.50 | 1.30 0.06 2512 | Black 5.5mQ 6.35 | 3.18 | 0.47 | 1.30 0.06 2512 | Black 6mQ 6.35 | 3.18 | 0.50 | 1.30 0.06 "2512 | Black 7mQ 6.35 | 3.18 | 0.45 | 1.30 0.06 2010 | Green| imQ- 10mQ 5.08 | 2.54 | 0.6 | 1.67 TBA 1206 | Green| 1mQ-10mQ 3.2 | 16 | 06 | 0.98 TBA 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 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. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com telectronics eee ee eee ee Ree eee eee eee Fr Ordering Procedure Example: ULR2 at 2.5 milliohms and 1% tolerance on reel of 2000 pieces: ULR2-RO025FT2 Type Value (use IEC62 code) Tolerance (use IEC62 code) : F | 1% J | 5% Packing 2512 T2 | Tape 2010 2000 / reel Z 1206 2 a a RR a A cE EO SS Se ae eat 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. Welwyn Components Limited Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www. welwyn-tt.com