Can someone help identify the 3 pin photo device (not the entire module) on this "Icstation 5V Light Sensor Module"? (may be same as this one It seems to act as a photo-transistor, but yet has 3 pins instead of 2. Its nets are labeled (on PCB module) as "GND", "OUT", and "VCC". OUT has a 10k pull-up to VCC --- so seems to be open-collector. But it's a 3-pin device, so is it some kind of photo-transistor + op-amp/comparator + NPN? Does anyone have a Manufacturer + Manufacturer Part Number and/or can anyone point me to a datasheet?

  • 2
    \$\begingroup\$ Somebody seems to have figured it out. \$\endgroup\$
    – ocrdu
    Oct 24, 2021 at 11:02
  • \$\begingroup\$ A photo transistor does have 3 pins. A photodiode has two pins commonly but, can sometimes have three. \$\endgroup\$
    – Andy aka
    Oct 24, 2021 at 12:55
  • \$\begingroup\$ The IS0203 looks very similar to TT Electronics OPL530. The IS0203 appears optimized for 900 nm, whereas with the OPL530, "Irradiance measurements are made with λi = 935 nm". \$\endgroup\$ Oct 24, 2021 at 23:21

2 Answers 2


so is it some kind of photo-transistor + op-amp/comparator + NPN?

Yes, exactly.

According to this article by T.K. Hareendran, the sensor is all of these things, like the following:

ISO203 Detector

I could not find a datasheet.

Often, mass-produced, economy items from China do not have datasheets and are unlikely to have one. Fine for experimentation only. If looking for production (or even guaranteed characteristics), will have to find a different device with a datasheet, or incorporate your own [regulator, transimpedance amplifier, and open-collector output transistor].


It appears to have evolved from some other similar product. There's also an 0103 that has different sensitivity inverted output. The datasheet below is Japanese so maybe it was an original Japanese product or it was just the Japanese-language datasheet of some other product.

Here is more information but the manufacturer is not shown that I can see. Thanks to @ocrdu for the lead.

enter image description here

enter image description here

P.S. the watermark is the blog site, not the manufacturer.


Okay, it certainly appears to be a clone of a part made by Kodenshi of Kyoto, Japan. The datasheet for the very similar PIC0103SL is here.


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