PC817 PC817C Transistor Output Optocoupler DIP-4 2.54mm Pitch for DIY (Pack of 50pcs)

These MOSFETS are just what my projects need. Seem to work very well. Fast shipping at a good cost. Happy with purchase.

I needed some LM317s for a small electronics project and these fit the bill perfectly. I didn't need as many as this package came with, but for the price I couldn't resist! Excellent product!

Worked perfectly

The Allecin TIP41 100V 6A NPN Darlington power transistor worked well for me. My wife has a LED-lighted magnifying glass/lamp that died; the wall wart power supply died. A replacement power supply also did not work, so I purchased some parts-including these TIP41s-to build a 50 mA current source to drive the LEDs. I grabbed a TIP 41, built a little current source into the lamp housing, and fired it up. The LEDs came up just like they were supposed to at roughly the correct brightness. So, the TIP41 worked just as it was supposed to. However, note that the TIP41 transistors came loose in a little plastic box with no ESD protection. Given this, the transistors could all be damaged from ESD, and, if they work immediately, they could fail later from a latent defect. For that I remove a star. These days TIP41s seem to be a cheap ‘popcorn’ part sourced from many different vendors at a cheap price. The cases all have a ‘WS’ marking with a logo that I had never seen before, so I assume these are all parts sourced from China, and they might not meet requirements specified by TI or Motorola (ON Semi), and could be of very low quality, with very poor reliability (especially given no ESD protection). However, the parts were/are cheap, and my application is a non-critical application; if the TIP41 dies, I will just replace it in the circuit. Note also that given that the application is non-critical, I did not bother to test the parts, and I took no measurements and performed no testing on the current source that I built other than to confirm the brightness of the LEDs was about right. I buttoned up the light, and the wife is happy; end of story. Please allow me to emphasize again that I did not test the parts or the circuit, other than confirm that the LED brightness was about right, and thus have no clue regarding the quality or reliability of the parts. The one TIP41 that I used seemed to work correctly. I would not recommend their use in a critical application.

Worked good to build high amperage dc to dc converters.

Using them as over voltage protection for 12volt devices in a solar powered lighting system. They are are working fine so far.

My ESR meter resultsseems legit

The chips in these parts are evidently not properly bonded to their package tabs. When tested under the same load conditions (20 amps Ids, 12Vgs, Vds, these parts run at 100C compared with the same part number from Infineon which runs at 45C. Heatsinking has minimal effect. Three separate parts from the batch of parts were tested with the same results.

TRÈS BIEN.

Alles prima. Sehr gute Qualität, rasche Lieferung.

i mosfet sono stati m0ontati su amplificatore, ad oggi risultano ancora funzionanti ma non sono mai stati provati al limite della loro SOA.saluti

Très bon transistor pour usage général (pilotage de relais, petite charge etc..)

Cumple su funcion. Buen precio