LRZ Datasheet, PDF (2/3 Pages) Welwyn Components Limited – High Current Jumper Chip

High Current Jumper Chip
LRZ Series
Welwyn Components
Temperature Derating
120%
Derating Characteristic
100%
80%
60%
40%
20%
0%
0
50
100
150
Ambient Temperature (˚C)
Pulse Performance
Continuous Pulse Performance
1000
100
10
0.1
LRZ1206
LRZ2010
LRZ2512
1
10
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: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
Issue B · 02.05