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AHF2 (TiP) Switches

AHF2 (TiP) Switches Cautions For Use


As indicated on the previous page, the absolute maximum rating of the built-in photo-interrupter is 25°C.
In the enent that a voltage or current that exceeds the maximum rating is applied to, or passed between the terminals, the photointerrupter will no longer function normally. In such a case, do not reuse the photo-interrupter but discard it.
Be careful not to apply an excessively large load to the terminals because this may damage the photo-interrupter.


Perform soldering in less than 3 seconds with maximum 350°C iron. Care should be taken not to apply force to the terminals during soldering. We recommend a soldering iron with temperature adjustment in order to prevent poor quality soldering.
Please consult us if you intend to use a soldering iron of 60 W or higher.


This product is a non-contact type tip detection switch containing a photo-interrupter.
It is intended for installation in equipment. Because of the nature of a semiconductor, if this product is used continuously for a long period in a high temperature, low temperature and/or humid environment, according to the optic quantities decrease of luminescent diode output characteristics may be significantly affected. In such a case, take suitable measures, such as inserting a comparator at the output side, to provide a greater degree of margin with respect to change in the output characteristics, and thereby improve the reliability of the product.

4.Preventing a malfunction

The TiP sensor uses an internal sphere, hence chattering occurs if it is subjected to vibration or shock. To prevent chattering, continuously read pulses of 30 ms max. using a microprocessor, and set the microprocessor so that the switch goes L (ON) or H (OFF) if the output level exceeds 500 ms continuously. Also, take steps to keep induction and RF noise away from the sensor. The switch should be mounted keeping away from the vibration generator such as motor. Fix the PC board firmly in order to prevent resonance with the vibration generator, or the contact chattering of a switch may occur by the movement of a ball inside.
The allowable vibration level which the chattering does not occur would be less than 2.94m/s2 at 10 to 400Hz. (The range 260 to 320Hz may have a resonance point and the level should be less than 0.98m/s2.)


  • 1)Depending on the circuitry and the environmental conditions, solder migration may occur and short a circuit. Please confirm that the insulation distance is large enough in the actual application.
  • 2)To prevent a malfunction, the switch should be kept away from the direct sunlight and any other light sources.
  • 3)The noises caused by electrostatics, surge voltage and inductives may break the photo-interruptor.
  • 4)The reflow soldering and cleaning are not allowed.
  • 5)The switch should be mounted with the tolerance ±3 degree.

6.Confirmations in the actual use.

Each items in this spec sheet was tested and confirmed independently at a certain duration. To get a higher reliability of the equipment, please confirm the switch quality with the actual load and environmental conditions before using.

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