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How to detect phototransistor

In Electronic Infomation Category: H | on April 19,2011

Phototransistor detection can be checked from the appearance near the pipe key (raised) or a longer pin is the emitter e, far away from the tube or shorter, another key pin is the collector c. Wrap the tube with a black cloth, with a multimeter R 1 k files, two tables pen is the reverse of two pins each measuring time, the value should be measured are infinite. For the NPN-type tube, the red pen then emitter e, then the black pen collector c, remove the shade cloth, this time should be right Biaozhen deflection, resistance from the infinite to the direction of the small resistance to the 15 ~ 35 k deflect about is illustrated in phototransistor is normal. Deflection angle increases, the sensitivity is higher. If there is no deflection Biaozhen resistance is still infinity or zero, indicating that the tube has an open or short circuit damage.

Photodiode and EPM7032AETC44-7 datasheet and phototransistor as nearly the same shape, the detection method can also be used to distinguish them. Cover the window is measured between two pins, reverse resistance, the resistance of a freshman who is a small photodiode, forward and EPM7032AETC44-7 price and reverse resistance were infinite who are photosensitive transistor.

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