The 4N253SD is marked Obsolete by onsemi, meaning the manufacturer has ceased production. For existing BOM lines, this part is sourced through independent distribution — quantities are lot-specific and confirmed at RFQ. Availability and current pricing are verified at quote time.
Isolation and signal transfer
Rated for 5300Vrms isolation, this optoisolator provides galvanic separation between input and output circuits — suitable for safety barriers in industrial control or power supply feedback loops where high-voltage isolation is required. Minimum current transfer ratio is 20% at 10 mA forward current, with typical turn-on/turn-off times of 2 µs each. The 30V maximum output voltage and 500mV Vce saturation cover standard logic-level switching.
Temperature range and package
Operating temperature spans -55°C to 100°C, covering industrial and some military-grade environments. The 6-SMD Gull Wing package (supplier device package 6-SMD) is suited for surface-mount assembly with standard reflow profiles. Input type is DC, with a typical forward voltage of 1.18V and maximum DC forward current of 100 mA. The transistor-with-base output allows external base drive for custom gain or switching thresholds.