Sharp PC817C optocoupler in a DIP-4 package: electrically isolates two circuits and transfers the signal through an infrared LED and a phototransistor, with 5000 V rms isolation between input and output. Gain class C, compatible with EL817 and EL817C.
Key features
- 5000 V rms galvanic isolation between input and output
- Phototransistor output (collector and emitter available)
- Gain class C: CTR 200-400%
- Through-hole DIP-4 package, fits breadboards and sockets
Technical specifications
- Part number: PC817, rank C (marking on the part: C, PC817, SHARP)
- Manufacturer: Sharp
- Isolation voltage: 5000 V rms (1 minute)
- Current transfer ratio (CTR): 200-400% at IF 5 mA and VCE 5 V
- LED forward current (IF): 50 mA max
- LED forward voltage (VF): 1.2 V typical, 1.4 V max at 20 mA
- LED reverse voltage (VR): 6 V max
- Collector-emitter voltage (VCEO): 35 V max (80 V for production from July 2002)
- Collector current (IC): 50 mA max
- Saturation voltage VCE(sat): 0.1 V typical, 0.2 V max (IF 20 mA, IC 1 mA)
- Switching times: rise 4 µs, fall 3 µs typical (VCE 2 V, IC 2 mA, RL 100 Ω)
- Total power dissipation: 200 mW max
- Operating temperature: -30 to +100 °C
- Package: DIP-4, 2.54 mm pitch, 7.62 mm row spacing
Pinout
| Pin | Name | Function |
|---|
| 1 | Anode | LED positive (dot side) |
| 2 | Cathode | LED negative |
| 3 | Emitter | Phototransistor emitter |
| 4 | Collector | Phototransistor collector |
Usage tips
- Always use a series resistor for the LED: R = (Vin - 1.2 V) / IF. With 5 V and about 10 mA use 330-390 Ω; with 3.3 V and about 5 mA about 390 Ω.
- Output to a microcontroller: emitter (pin 3) to ground and a 4.7-10 kΩ pull-up resistor between the collector (pin 4) and the supply of the second circuit. The signal is inverted: LED on = output low.
- Do not connect the grounds of the two circuits together, or the isolation is lost.
- Suitable for slow signals, PWM up to a few kHz and mains detection; high-value pull-ups slow down switching. Fast communication needs high-speed optocouplers.
- If the input signal can reverse, protect the LED from reverse voltage (6 V max), for example with an anti-parallel diode.
Package contents
Typical uses
- Interfacing Arduino, ESP32 or Raspberry Pi with circuits at different voltages
- Isolated inputs for PLCs, relays and remote push-buttons
- Feedback in switching power supplies and repairs
- Detecting mains presence or other signals that must be isolated
Nota sulle fotoLe foto sono scattate da noi o fornite dal produttore e verificate sul prodotto reale. Il prodotto ricevuto può differire nell'aspetto (colore, marcature, confezione o lotto), mantenendo funzioni e caratteristiche tecniche dichiarate dal produttore.
