The onsemi 4N37 is officially obsolete per the manufacturer's lifecycle record. No direct pin-compatible successor is listed from onsemi. Quantities are lot-specific and confirmed at RFQ — no stock-holding claim is made here.
Isolation and switching performance
Rated for 5300Vrms isolation — this is the reinforced-grade figure for a 6-DIP optocoupler, suitable for separating high-voltage power circuits from low-voltage control logic in industrial PSUs, motor drives, and PLC I/O modules. Minimum current transfer ratio of 100% at 10mA forward current means the output transistor saturates with a modest LED drive — useful for 5V or 3.3V logic interfaces where the input side cannot source high current. Typical turn-on and turn-off times of 2µs each set a practical switching ceiling around 250 kHz — adequate for status feedback, relay drivers, and isolated serial communication at standard baud rates, but not for high-speed digital isolation.
Package and temperature range
Operating temperature spans -55°C to 100°C, covering the full industrial range and most outdoor telecom enclosures. The 100°C upper limit is below automotive under-hood requirements but fine for factory-floor cabinets.
Compliance and ordering
ROHS3 compliant — no restricted substances above the threshold limits, so the part passes EU regulatory checks without an exemption certificate. Supplied in tube packaging — the standard DIP-6 tube format for through-hole assembly. No reel or tape option is listed for this order code.