Comimark 5Pcs BPW34 Silicon PIN Photodiode DIP-2

We're using these to validate laser diodes from China. Works great!

Great product, price and fast shipping.

Very nice gain on these. I am using it to convert light to sound, so I need sensitivity in low light like listening to the strobes on aircraft.

Not sure if these are real Vishay products, but they work in my application.

These seem to work well, at first glance. They are shipped all together wrapped up in a simple piece of tissue (photo), which does cause them to stay together and not rattle around in the baggie while in route, but it also means that they are rubbing against each other, which in turn causes the glass surfaces to get badly scratched (photo). This is not good considering it's a light-dependent component! Any distortion or damage to the surface will affect it's efficiency and/or reliability. I would recommend double checking for functionality before return window closes.