During normal maintenance, four-legged optocouplers can be replaced with each other regardless of the specific model. Six-pin optocoupler should pay attention to whether there is a base on one side of the photocell. If there is a cardinal number, you must choose it. If there is no base, it should be replaced with a four-legged optical coupler without base. ?
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Pay attention to replace the optical coupler.
1, isolation voltage should be considered.
Optocoupler is an isolation device, which can isolate input and output. This is very important in product certification and evidence collection. Different certification levels require different isolation voltages, such as 3000V isolation voltage and 5000V isolation voltage.
2. The switching frequency of optocoupler should be considered.
According to the switching frequency of optocouplers, they can be divided into ordinary optocouplers and high-speed optocouplers. This frequency refers to the response speed of the output signal when the frequency of the input signal is relatively high. For high-speed signals, we must consider the switching frequency of optocoupler and choose high-speed optocoupler.
3. Consider whether it is a linear optical coupler.
Another kind of optical coupler is linear optical coupler, and its output and input have a certain linear relationship. This kind of optical coupler is often used in AD sampling circuit, which can not only realize the linear transmission of signals, but also realize the isolation of signals. This kind of optical coupler is expensive. Be sure to consider whether it is a linear optocoupler when replacing it.