PC817 (OptoCoupler) DIP-4

The PC817 is a general-purpose optocoupler that contains an infrared LED optically coupled to a phototransistor in a 4-pin package. It provides galvanic isolation between input and output, allowing digital or analog signals to be transferred while protecting low-voltage logic from high voltages, ground loops, or electrical noise. The family includes through-hole DIP, wide-lead, and SMT gullwing lead-forms and offers several CTR ranks so designers can select parts for different gain/drive conditions.

Because the device uses a transistor output stage it is ideal for I/O isolation, noise suppression in switching circuits, and signal level translation between different potentials or impedances. The PC817 is UL-recognized for isolation (UL1577) and specified with high input-to-output isolation (5.0kVrms), moderate speed (µs-range response), and broad temperature/storage ratings—making it suitable for general industrial, consumer, and communications equipment.

Features:

• Optically coupled LED → phototransistor design.
• 4-pin package (DIP and SMT options).
• Multiple CTR (current transfer ratio) ranks available.
• High input-to-output isolation (UL recognized).
• Low-profile packages and wide-lead options for through-hole and SMT assembly.

Specifications:

Forward Voltage (VF):1.2V, Max. 1.4V

Reverse Voltage (VR):Max. 6V

Forward Current (IF):Max. 50mA

Peak Forward Current (IFM):1A (pulse)

Collector-Emitter Voltage (VCEO):80V

Emitter-Collector Voltage (VECO):6V

Collector Current (IC):Max. 50mA

Collector Power Dissipation:150mW

Total Power Dissipation:200mW

Isolation Voltage (Input–Output);5.0k

VrmsCut-off Frequency:80kHz

Rise Time:4µs

Fall Time:3µs

Operating Temperature Range:−30°C to +100°C

Storage Temperature Range:−55°C to +125°C

Soldering Temperature (Peak):260°C (leads), 250°C (package surface)