A physical shorting block or wire used to connect two points in a circuit. Jumpers are typically small plastic blocks containing a metal receptacle that slides over a pair of header pins to configure board settings, bypass features, or close a test loop. In rework, a jumper can also be a length of wire soldered directly between pads to fix a broken trace.
Move the jumper on J3 to pins 2 and 3 to set the board to 5V logic.
Avoid using long wire jumpers for high-speed signals, as they add significant inductance and act as antennas.
Also heard as
- shorting block
- shunt
Related terms
Pin header
A row of exposed metal pins housed in a plastic base, used for board-to-board or wire-to-board connections.
Bodge wire
Wire soldered onto an assembled board to fix a design error by joining points the copper failed to connect.
Blue wire
Rework jumper wire on a board, named for the blue insulation often used, and the verb for adding one.
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