Transistor outputs are designed for signal switching and logic interfacing, while photovoltaic outputs generate a voltage to drive the gate of a power MOSFET or IGBT.
Optoisolators - Transistor & Photovoltaic Output Component Intelligence
Galvanic isolation components for signal integrity and safety.
What are Optoisolators - Transistor & Photovoltaic Output components?
Optoisolators with transistor or photovoltaic outputs provide essential galvanic isolation between low-voltage control logic and high-voltage power stages. Select based on Current Transfer Ratio (CTR), isolation voltage, and switching speed requirements for your specific signal path.
How to Choose Optoisolators - Transistor & Photovoltaic Output Components
Selecting the right optoisolator requires balancing signal speed, power efficiency, and safety isolation ratings.
Current Transfer Ratio (CTR)
Match the CTR range to your gain requirements; note that CTR degrades over the component's lifetime due to LED aging.
Isolation Voltage
Ensure the rated isolation voltage (Vrms) exceeds your system's safety standards and potential surge conditions.
Switching Speed
Transistor outputs are generally slower than high-speed logic gates; verify rise/fall times for your specific data rate.
Output Configuration
Choose between standard phototransistor outputs for general switching or photovoltaic outputs for driving MOSFET gates.
Package & Mounting
Select between DIP, SMD, or SOP packages based on your PCB footprint and thermal management constraints.
Popular Optoisolators - Transistor & Photovoltaic Output Components
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