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Jumper

What is a jumper?

Component that connects circuits that are separated from each other such as circuit boards are called jumpers. Jumper has very low resistance value and are available in chip, leaded and plate types.

Applications of jumpers are as follows:

  • Connecting a circuit over the different circuit with single-sided wiring boards, etc.
  • Securing the current capacity
  • Testing the circuit boards (isolating and connecting)
  • Function switching by product grade (high grade, middle grade, general grade.)

Jumpers have more than 0 Ω

Jumpers have a very low resistance value because they shorts patterns, which gives it an another name, "zero ohm resistor".

Even though they are called "zero ohm resistor", the Flat Chip Jumper Resistor RK73Z, which has a shape of a chip resistor, has a resistance value of 50 mΩ or less due to its structure.

For this reason, the allowable current is comparatively small and it cannot be exceeded. Also, an attention needs to be paid to the heat generation and deterioration caused by the electric current.

On the other hand, the metal plate chip jumpers SLZ1 and TLRZ have low electrical resistance and thermal resistance, making them suitable for the use in large current.

Item

Series

Product Name

Resistance value (max.)

Rated allowable current

Leaded Type

Z

Coat-Insulated Zero OHM Resistors

20mΩ

1.5～2.5A

Leaded Type

J-Z

Insulated Jumper Wires

 -

8～10A

Leaded Type

JL

Jumper Wires

 -

8～10A

Rectangular chip

RK73Z

Flat chip jumper resistors 

50mΩ

0.5～2A

Cylindrical chip

CC

MELF Type Cross-conductors

20mΩ

2～5A

Molded metal plate

SLZ1

High current chip jumper

0.5mΩ

44A

Metal plate

TLRZ

Metal Plate Chip Type Jumper

0.5m / 0.2mΩ

10～50A

Jumper usage example

Typical applications such as analog circuits and logic circuits are shown below. 

  • Product version setting (bit switch)
  • Short circuit of parts that are no longer needed due to design changes. (fuses, current detection resistors, etc.)
  • Connecting circuit blocks (circuit block separation for circuit analysis)
  • Bypass of large current pattern (low impedance connection, measures against noise and unwanted radiation)

Replacement of parts that are no longer needed due to design changes

Circuit separation/connection during operation analysis

High current jumper

In power supply circuits, the copper foil of the wiring board may be thickened to secure the current capacity. In this case, the jumper that connects the circuits must be able to handle large currents.

In addition, in wiring boards with the mixture of fine wiring, since the copper foil cannot be thickened due to the design rule restrictions, the current capacity is improved by mounting jumpers on the line where large current flows, in some cases.

[No jumper]

- Copper foil thickness of the substrate: 35 μm
- Conductor width of the substrate: 1.6 mm
- Allowable current <1.6A

[Applications for jumpers]

- Copper foil thickness of the substrate: 35 μm
- Conductor width of the substrate: 1.6 mm
- Jumper: TLRZ2B
- Allowable current: <50A