The EL817(C)-F from Everlight Electronics is a single-channel phototransistor-output optocoupler consisting of an infrared-emitting diode optically coupled to a silicon phototransistor. It transfers control or data signals while providing galvanic isolation between circuits operating at different electrical potentials.
The “C” CTR rank specifies a current transfer ratio of 200% to 400% at IF=5mA and VCE=5V. This defined CTR range helps designers estimate output collector current from the LED input current and maintain more consistent circuit behavior across production units.
On the input side, the infrared LED supports up to 60mA continuous forward current and 6V reverse voltage. Typical forward voltage is approximately 1.2V at IF=20mA, with a maximum of 1.4V. The output phototransistor supports up to 50mA collector current, 35V collector-emitter voltage, and 6V emitter-collector voltage.
The EL817 provides 5000Vrms input-to-output isolation voltage. Typical collector-emitter saturation voltage is 0.1V, with a maximum of 0.2V under the specified test condition. Typical cutoff frequency is approximately 80kHz, with typical rise and fall times of approximately 4μs and 3μs, respectively.
The EL817(C)-F uses a standard 4-pin DIP through-hole package. Under Everlight’s ordering convention, the “F” suffix denotes the iron lead-frame option. The device is rated for operation from -55°C to +110°C and is designed for general isolation applications including programmable controllers, measurement systems, telecommunications equipment and home appliances.
Key Specifications:
- Brand: Everlight
- Part Number: EL817(C)-F
- Series: EL817
- Product Type: Phototransistor Optocoupler
- Number of Channels: 1
- Input Type: Infrared LED
- Output Type: Phototransistor
- CTR Rank: C
- Current Transfer Ratio: 200% to 400%
- CTR Test Condition: IF=5mA, VCE=5V
- Isolation Voltage: 5000Vrms
- Maximum Forward Current: 60mA
- Peak Forward Current: 1A
- LED Reverse Voltage: 6V Max
- LED Forward Voltage: 1.2V Typ / 1.4V Max
- Maximum Collector Current: 50mA
- Collector-Emitter Voltage: 35V
- Emitter-Collector Voltage: 6V
- VCE(sat): 0.1V Typ / 0.2V Max
- Cutoff Frequency: 80kHz Typ
- Rise Time: 4μs Typ
- Fall Time: 3μs Typ
- Isolation Capacitance: 0.6pF Typ
- Operating Temperature: -55°C to +110°C
- Storage Temperature: -55°C to +125°C
- Total Power Dissipation: 200mW Max
- Package: DIP-4
- Pin Count: 4
- Mounting Type: Through Hole
- Lead Frame Option: Iron
- Lead-Free: Yes
- RoHS Compliant: Yes.
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