Opto isolator board8/9/2023 ![]() ![]() Sharp IR LEDs are now licensed to Vishay. Nobody is better than Sharp in these IR optos. Sharp makes some only in Japan also which are also good, maybe better quality PC123X5YFZ1B where 5 is Rank N 10 to 20 mA / 5mA similar to Rank C in the other p/n. There are a few other Optos rated for 5kVrms but no others at Mouser are ranked as well for CTR, Onsemi= CTR= 1 to 6, Everlight = 1 to 2. Overview High Speed Optical Isolators (Encoder Input) Optical isolators connect encoders to PLCs, servo drives, and other devices. You could also use 4 as Rank D Ic= 15 to 30 mA both for If= 5mA which is slightly better and also cheaper a few cents perhaps due to high yield and more common, which is also stocked. ![]() PC817X3NSZ1B for DIP which are the only ones in stock at this time. The new stock part number uses 3 for X as Rank C Ic= 10 to 20mA No doubt this will cause a cascade of component secondary failures. Still supplies them to Mouser, but they have new part numbers and they are most likely DIP for HV spacing of 5 kV could easily have been compromised by dust and humidity. W is the factory now made by LITE-ON in China They just overdrive the LEDs to ensure low Vce(Sat) but you app might not. Ic/If= 20mA/1mA= 0.05 Vce(sat)= 0.1 to 0.2V so at Vce=Vce(sat) Ic=1mA CTR= 0.05/2~4= 2.5% to 1.25% Although the new datasheets do not show any distinction for CTR saturated vs different ranks, they do exist and will be around 10% of the max linear CTR for a fixed Vce(sat) max. Yes, the Reddit posts approach is likely to work ok, as long as you correctly follow the cautions in it: connect the VCC pin of the relay board to a 5V source, connect together the Arduino ground, the relay ground, and the 5v-source ground. Then do a diode test on all other parts or use a conservatively limited CC limited lab supply to bring up DC power externally to locate defective parts.ĬWN1 C means CTR = 2 to 4 = Ic=/If= 10~20mA / 5 mA = 2 to 4 Vce= 5V but as a switch CTR, like hFE, always reduces to << 10% CTR Vce(sat) Use an Opto-Isolated Breakout Board Your CNC electronics and your PC are each a source of noise as well as being vulnerable to noise from the other. I recommend the PC817X3NSZ1B or PC817X4NSZ1B replacement. ![]() The part number is always closest to the logo or company name and the CWN1 = factory/date/batch codes. ![]()
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