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| High Current Jumper Chip Welwyn Components LRZ Series * * * * * High current zero-Ohm link Thick film copper technology Current rating to 35A Typical resistance 1.5m Inductance below 0.2nH Electrical Data Size Current rating @ 70 C 2 second overload current @ 25C Resistance Ambient temperature range Dielectric withstand voltage Temperature rise at rated current Pad & trace area for rated current Amps Amps Ohms C Volts C mm2 30 40 0805 15 30 1206 20 40 0.003 max. -55 to +150 200 40 50 80 100 90 300 See Application Notes 2010 30 60 2512 35 70 Notes DC or AC rms 0.0015 typ. Physical Data Dimensions (mm) & Weight (g) L 0805 1206 2010 2512 2.0 0.3 3.20 0.31 6.5 0.38 W 1.25 0.2 1.63 0.2 3.25 0.25 T 0.61 0.1 0.61 0.1 0.74 0.1 0.74 0.1 A 0.3 0.15 C 0.3 0.1 Wt 0.009 0.020 0.036 0.055 A L A W C T 0.48 0.25 0.48 0.25 0.48 0.25 0.48 0.25 0.48 0.25 0.48 0.25 5.23 0.38 2.64 0.25 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 260C for 30 seconds and are suitable for reflow or wave soldering processes. Terminations The wrap-around copper terminations have an electroplated nickel barrier and solderable coating, which ensures excellent `leach' resistance properties and solderability. Chips can Marking 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 Issue B * 02.05 (c) 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 29 High Current Jumper Chip LRZ Series Welwyn Components Temperature Derating Derating Characteristic Proportion of Rated Current 120% 100% 80% 60% 40% 20% 0% 0 50 Ambient Temperature (C) 100 150 Pulse Performance Continuous Pulse Performance 1000 Peak Current (A) 100 LRZ1206 LRZ2010 LRZ2512 10 0.1 1 10 100 1000 Pulse Duration (ms) Application Notes Conventional thick film "zero-Ohm" jumper chips typically have up to 50m 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 150C (see performance above). For conventionally soldered jumper chips, the joint temperature should not exceed 110C. This condition is met when the stated current levels at 70C are used. (c) 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 B * 02.05 High Current Jumper Chip LRZ Series Welwyn Components Packaging LRZ jumper chips are supplied taped and reeled as per IEC 286-3. T2 D0 P2 P0 T 33 1.0 Marking Wr E F 13 0.5 178 2 80 2 B0 T1 2.5 0.5 0.8 0.15 K0 A0 P1 D1 Tape and Reel Dimensions (mm) G W Qty. Wr 0.5 0805 1206 2010 2512 9 9 13 13 W 0.3 8 8 12 12 P1 0.1 4 4 8 8 P0 4 4 4 4 P2 2 2 2 2 D0 0.1 1.5 1.5 1.5 1.5 D1 0.2 1 1 1.5 1.5 E 1.75 1.75 1.75 1.75 F 3.5 3.5 5.5 5.5 A0 1.45 1.95 2.79 3.61 B0 0.1 2.3 3.55 5.89 6.96 K0 0.1 1.0 1.0 0.91 1.17 T 0.2 0.2 0.28 0.28 T1 0.05 0.05 0.06 0.06 T2 per 0.1 0.05 0.1 0.05 0.1 0.05 Nom. 0.15 reel 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 Size 1206; 2010; 2512 Resistance Code Value R000 only LRZ 1206 R000 (c) 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 B * 02.05 |
Price & Availability of LRZ1206R000
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