Circuit check (check terminal)

What is a check terminal (checker-chip)?

Check terminals are useful for checking the operation of the prototype board in circuit design, and for adjusting and checking the electrical characteristics in the manufacturing and assembly processes. They are also called terminal post, test point, probe point or contact pin besides "checker chip".

When checking the operation of a board on which electronic components are mounted, transient operations and signals may be checked using an oscilloscope. However, holding the probe on the circuit by hand may cause the influence due to the static capacitance of the human body, and cause the noise. Also, it is not easy to keep holding the probe for a long time.

Check terminals are required to have a shape that allows the probe to be hooked and have holdability.



KOA's check terminals, checker-chips, are in a ring shape, so the probing can be performed either from the left side or the right side.

Features of checker chips

  • Chip type that are suitable for surface mounting, and can be automatically mounted like chip resistors and MLCCs.
  • Ring shape for easy probing from any angle
  • Extensive size lineup (1608, 2012, 3216 mm code) allows selection according to board space and probe shape
  • Since the inside is not plated, flow soldering can be performed

Item Series Dimensions (mm)
SMD RCU 1.6×0.8×1.15
SMD RCT 2.0×1.25×1.45
SMD RCS 3.2×1.6×1.25
SMD RCW 3.2×1.6×2.0