Everlight

Everlight is a Taiwan-based optoelectronics maker, and the profiles here cover its transistor-output optocouplers for isolated feedback and signal transfer in power supplies, appliance controls and industrial interfaces. Three codes anchor the hub. The EL817(C) is the through-hole member in DIP-4, C-ranked with a current transfer ratio of 200 % to 400 %. The EL357N(B)(TA)-G brings the same function to an SOP-4 body, B-ranked at 130 % to 260 %, with the halogen-free -G form and an 80 V collector-emitter breakdown. The ELQ3H7(TA) is the quad member in SSOP-16, unranked with a single transfer band of 50 % to 600 % and 3,750 Vrms isolation. One habit matters across this line: the rank letter is part of the specification, not a lot detail — an offer in a different rank changes the loop gain and has to be requalified.

Sourcing notes for Everlight parts. Always quote the complete manufacturer ordering code — package, temperature grade, speed or accuracy grade, and packing (reel, tube or tray) all change availability and price, and suffixes are where most mismatches happen. Check the lifecycle status on the manufacturer site before committing to a multi-year build; parts flagged not-recommended or obsolete need a last-time-buy plan or a verified alternate lined up early. With every offer, request traceability documents — date code, lot code and original packing — and confirm the inspection steps your supplier applies to high-risk lots.