LRZ_B.qxd 2/16/05 3:49 PM Page 1 High Current Jumper Chip Welwyn Components LRZ Series • • • • • High current zero-Ohm link Thick film copper technology Current rating to 35A Typical resistance 1.5mΩ Inductance below 0.2nH Electrical Data Size 0805 1206 2010 2512 Current rating @ 70 °C Amps 15 20 30 35 2 second overload current @ 25ºC Amps 30 40 60 70 Resistance Ohms 0.003 max. Ambient temperature range °C -55 to +150 Dielectric withstand voltage Volts Temperature rise at rated current Pad & trace area for rated current DC or AC rms 0.0015 typ. 200 ºC 30 40 80 90 mm 40 50 100 300 2 Notes See Application Notes Physical Data Dimensions (mm) & Weight (g) 0805 L W T A C Wt 2.0 ± 0.3 1.25 ± 0.2 0.61 ± 0.1 0.3 ± 0.15 0.3 ± 0.1 0.009 1206 3.20 ± 0.31 1.63 ± 0.2 0.61 ± 0.1 0.48 ± 0.25 0.48 ± 0.25 0.020 2010 5.23 ± 0.38 2.64 ± 0.25 0.74 ± 0.1 0.48 ± 0.25 0.48 ± 0.25 0.036 2512 6.5 ± 0.38 0.74 ± 0.1 0.48 ± 0.25 0.48 ± 0.25 0.055 3.25 ± 0.25 C T A L A W Wrap-around terminations (3 faces) Construction A thick film copper conductive element and organic protection are screen printed on a 96% alumina substrate. withstand immersion in solder at 260˚C for 30 seconds and are suitable for reflow or wave soldering processes. Terminations Marking The wrap-around copper terminations have an electroplated nickel barrier and solderable coating, which ensures excellent ‘leach’ resistance properties and solderability. Chips can The body protection is resistant to all normal cleaning solvents suitable for printed circuits. Chips are marked R000 except for 0805 size which are not marked. 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 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 02.05 29 2/16/05 3:49 PM Page 2 High Current Jumper Chip LRZ Series Welwyn Components Temperature Derating Proportion of Rated Current Derating Characteristic 120% 100% 80% 60% 40% 20% 0% 0 50 100 150 Ambient Temperature (˚C) Pulse Performance Continuous Pulse Performance 1000 Peak Current (A) LRZ_B.qxd LRZ1206 LRZ2010 LRZ2512 100 10 0.1 10 1 100 1000 Pulse Duration (ms) Application Notes Conventional thick film “zero-Ohm” jumper chips typically have up to 50mΩ resistance values and 1 to 2A current ratings. LRZ jumper chips offer a solution for currents over an order of magnitude greater by combining lower resistance values with better thermal conductivity. Care should be taken when designing the associated printed circuit board tracks to ensure that they can carry the required current without excessive heating, for example by using multiple layers thermally linked with many vias. Any temperature rise caused by power dissipated in the PCB tracks themselves should be allowed for when calculating the ambient temperature in order to determine whether power de-rating should be applied. The minimum recommended pad and trace areas close to the resistor stated under Electrical Data should be provided at each terminal. For multi-layer PCB’s, this minimum area requirement should be met by surface layers rather than buried layers. The actual solder pad area follows the normal design rules for chip resistors. LRZ jumper chips themselves can operate at a maximum temperature of 150˚C (see performance above). For conventionally soldered jumper chips, the joint temperature should not exceed 110˚C. This condition is met when the stated current levels at 70˚C are used. © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 02.05 2/16/05 3:49 PM Page 3 High Current Jumper Chip LRZ Series Welwyn Components Packaging LRZ jumper chips are supplied taped and reeled as per IEC 286-3. T2 P0 D0 T P2 Wr 33 ± 1.0 E Marking G B0 80 ± 2 W F 13 ± 0.5 178 ± 2 LRZ_B.qxd T1 A0 0.8 ± 0.15 2.5 ± 0.5 K0 D1 P1 Tape and Reel Dimensions (mm) 0805 1206 2010 2512 Wr W P1 ±0.5 ±0.3 ±0.1 9 9 13 13 8 8 12 12 4 4 8 8 Qty. P0 P2 ±0.1 ±0.05 4 4 4 4 2 2 2 2 D0 D1 ±0.1 ±0.2 1.5 1.5 1.5 1.5 1 1 1.5 1.5 B0 K0 ±0.1 ±0.05 ±0.1 E F ±0.1 ±0.1 1.75 1.75 1.75 1.75 2.3 3.55 5.89 6.96 1.0 1.0 0.91 1.17 3.5 3.5 5.5 5.5 A0 1.45 1.95 2.79 3.61 T T1 T2 per ±0.05 Nom. ±0.15 reel 0.2 0.2 0.28 0.28 0.05 0.05 0.06 0.06 1.3 1.3 3000 1.21 3000 1.45 1800 Ordering Procedure Specify type reference etc. as shown in this example of LRZ1206: Type LRZ - Zero Ohm Jumper LRZ 1206 R000 Size 1206; 2010; 2512 Resistance Code Value R000 only © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 02.05