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Technology-related Inquiries

Q1. What should I do if I do not need to use the base terminals in photocouplers that come equipped with them?
Q2. How do I read photocoupler date codes?
Q3. Production of models PC904 and PC905 (photocouplers with built-in voltage-detecting circuits) has ceased and there are no alternative models. I want to know how to use other models as alternatives.
Q4. What is the difference between photointerruptors with built-in pull-up resistance and those without?
Q5. I want to know the conditions for soldering LEDs.
Q6. I want to know the conditions for soldering optoelectronics.
Q7. What is the difference between the digital and analog output of distance measuring sensors?
Q8. The output of my analog distance measuring sensor does not conform to the specifications.
Q9. I want to know the standard mounting pattern for low power-loss voltage regulators and chopper regulators.
Q10. I want to know the heat transfer resistance (θ(j-c)) for low power-loss voltage regulators and chopper regulators.
Q11. An electrolytic capacitor is listed in the circuit diagram in the low power-loss voltage regulator datasheet, but can I use a ceramic capacitor instead?
Q12. Is it necessary to cycle power or restart the system after the regulator ASO protection, overheat protection, or overcurrent protection circuit has been triggered?
Q13. What is the difference between phototriac couplers that have SSR zero-cross cicuits and those that don't?
Q1. What should I do if I do not need to use the base terminals in photocouplers that come equipped with them?
Basically, you should have no problem leaving the terminal open, but if you experience any noise, you can insert a 1 MΩ resistor into the base emitter opening. This may deteriorate the sensitivity (CTR) of the photocoupler, so if you know that you will not be using the base terminal, be sure to use a model that does not have one.
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Q2. How do I read photocoupler date codes?
Sharp photocoupler, phototriac coupler, and solid-state relay date codes use the old DIN standard.
Click here for details. (PDF)
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Q3. Production of models PC904 and PC905 (photocouplers with built-in voltage-detecting circuits) has ceased and there are no alternative models. I want to know how to how to use other models as alternatives.
In the case of model PC904 or PC905, we recommend the use of general-purpose or European-safety-standard-approved photocouplers such as PC817XJ0000F and PC123J00000F with an externally attached third-party 431 series shunt regulator.
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Q4. What is the difference between photointerrupters with built-in pull-up resistor and those without?
Models with built-in pull-up resistor may be used as-is, but since those without built-in pull-up resistor output open-collector signals, an external pull-up resistor is needed.
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Q5. I want to know the conditions for soldering LEDs.
Click here for details. (PDF)
However, LED lamps are not compatible with solder reflow.
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Q6. I want to know the conditions for soldering optoelectronics.
Conditions differ according to model. Please contact your nearest Sharp electronic component sales subsidiary.
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Q7. What is the difference between the digital and analog output of distance measuring sensors?
Digital output determines if the object within the detectable range is nearer or farther than the set distance. Analog output determines the distance of the object within the detectable range, giving linear voltage output that corresponds to differences in distance.
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Q8. The output of my analog distance measuring sensor does not conform to the specifications.
Please check the following points:
• Noise from the power supply circuitry;
• If there is a visible-light filter between the sensor and object;
• If there is any reflected or foreign light interfering with measurement;
• If there are any mirrored surfaces on the object;
• If the object to be measured is not aligned with the axis of the infrared light emitted from the sensor.
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Q9. I want to know the standard mounting pattern for low power-loss voltage regulators and chopper regulators.
The through-hole mount type has no special standards. Click here for the surface-mount type's standard mounting pattern. (SC-63, TO-263, SOT-23L, SOT-89-5)
If you require a mounting pattern with heat radiation, other patterns should be considered.
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Q10. I want to know the thermal resistance (θ(j-c)) for low power-loss voltage regulators and chopper regulators.
The thermal resistance for the SC-63 type is 12.5 °C/W, and that for the TO-263 type is 2.86 °C/W.
Thermal resistance for the TO-220 type differs by model.
It can be calculated using the formula θ(j-c) = Tj(max.) – Tc/Pd.
* Even though the maximum rated temperature is 150°C, please design your devices with a limit of 125°C, Tj(max.) in mind, as overheating protection measures may be triggered between 125°C and 150°C.
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Q11. An electrolytic capacitor is listed in the circuit diagram in the low power-loss voltage regulator datasheet, but can I use a ceramic capacitor instead?
Please use a regulator that is compatible with ceramic capacitors if you are considering using a ceramic capacitor as an output capacitor.
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Q12. Is it necessary to cycle power or restart the system after the regulator ASO protection, overheat protection, or overcurrent protection circuit has been triggered?
Once normal operating parameters are restored, any protective circuitry returns to normal.
However, since the application of voltage that exceeds the rated conditions is what triggers the protective circuitry, be sure to check all settings closely.
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Q13. What is the difference between phototriac couplers that have SSR zero-cross cicuits and those that don't?
As written below, components are roughly categorized into those with zero-cross circuitry and those without.
Components without zero-cross circuitry: phase control is possible.
Components with zero-cross circuitry: noise reduction is possible.
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