The CNY17F4SD: It belongs to the broad CNY17 family of optoisolators and is specified for 5300Vrms isolation between input and output. Key transfer characteristics: current transfer ratio (CTR) is guaranteed between 160% and 320% at a forward current of 10 mA. This means the output transistor can sink at least 16 mA with 10 mA LED drive — sufficient to pull a logic input low or drive a low-power relay coil directly. Output side ratings: maximum collector-emitter voltage of 70 V and continuous output current of 50 mA per channel. Typical switching speeds are 1 µs rise and 2 µs fall, with turn-on/turn-off times of 2 µs and 3 µs respectively — fast enough for 100 kHz signal isolation in most industrial control interfaces. Operating temperature spans -55°C to 100°C, covering industrial and some military/aerospace ambient conditions. The 6-SMD gull-wing footprint is common for optocouplers and mates with standard SOIC-6 land patterns.
onsemi has marked the CNY17F4SD as Obsolete. No official successor or pin-compatible replacement is listed in the current record. This part is no longer available through standard authorized distribution channels. Each lot is verified for authenticity and traceability before shipment.
Package and board-fit note
Supplied in Tape & Reel (TR) format, the CNY17F4SD is ready for automated pick-and-place assembly. The 6-SMD gull-wing leads are coplanar and solderable with standard reflow profiles for SOIC-6 packages. The supplier device package is designated 6-SMD — the same 7.5 mm × 9.5 mm body as the standard DIP-6 footprint but with formed gull-wing leads for surface mounting. No through-hole adapter is needed for SMD boards.