Cosmo (冠西) Photocouplers (Optocouplers)

About Photocouplers (Optocouplers)

High-performance photocouplers for signal isolation including transistor output, Darlington, triac, and high-speed types.

As an authorized distributor of Cosmo (冠西), BeiLuo provides a comprehensive range of Photocouplers (Optocouplers) products. These products are widely used in industrial control, automotive electronics, consumer electronics, and communication equipment. We offer a complete product line with multiple series to meet various application requirements. All products are genuine and original, backed by professional technical support and comprehensive after-sales service.

Selection Guide: How to Choose the Right Photocouplers (Optocouplers)

Product List

6 products available

Part Number ↕	Output Type ↕	Isolation Voltage ↕	CTR ↕	Forward Voltage ↕	Forward Current ↕	Package ↕	Stock Status	Action
K1010	Transistor	2500Vrms	50-600% (at If=5mA, Vce=5V)	1.2V typical	50mA max	DIP-4	In Stock	View Details
K2010	Transistor	5000Vrms	50-600% (at If=5mA, Vce=5V)	1.2V typical	50mA max	DIP-6	In Stock	View Details
KMOC3053	Triac (Zero-Cross)	2500Vrms	-	1.2V typical	60mA max	DIP-6	In Stock	View Details
KPC4502	Open Collector	2500Vrms	-	1.4V typical	20mA max	DIP-8	In Stock	View Details
KP5010	Darlington	2500Vrms	100-300% (at If=5mA, Vce=5V)	1.2V typical	60mA max	DIP-6	In Stock	View Details
KPC6N138	Open Collector	2500Vrms	-	1.4V typical	20mA max	DIP-8	In Stock	View Details

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Frequently Asked Questions

What is the difference between transistor and Darlington output photocouplers?

Transistor output photocouplers (like K1010 series) use a single phototransistor and offer moderate CTR (50-600%). Darlington output photocouplers (like KP5010 series) use a Darlington pair configuration, providing much higher current gain (CTR 100-300%) but slower switching speed. Choose Darlington for high-gain applications, standard transistor for general-purpose isolation.

Use Darlington for high gain, standard transistor for speed.

When should I use a triac output photocoupler?

Triac output photocouplers (like KMOC304x, KMOC305x series) are designed for AC load switching and zero-cross detection. They contain a phototriac that can directly drive AC loads. Use them for AC motor control, heater control, lighting control, and other AC switching applications where isolation is required.

Use triac output for AC load switching applications.

What is the operating temperature range of Cosmo photocouplers?

Most Cosmo photocouplers operate from -40°C to +85°C ambient temperature. Some industrial-grade models extend to +100°C or +125°C. The junction temperature is typically rated to +125°C. Always check the specific datasheet for your selected model's temperature ratings.

Verify temperature range matches your application environment.

How do I calculate the input resistor for a photocoupler?

The input resistor value is calculated using: R = (Vcc - Vf) / If, where Vcc is supply voltage, Vf is LED forward voltage (typically 1.2V), and If is desired forward current (typically 5-20mA). Ensure the current is sufficient to achieve the required output current based on CTR. Contact BeiLuo FAE for detailed calculations.

Calculate based on supply voltage, LED Vf, and desired current.

Are Cosmo photocouplers RoHS compliant?

Yes, all Cosmo photocouplers are RoHS compliant and lead-free. They meet environmental regulations for use in worldwide markets. Halogen-free options are also available for specific applications. Contact BeiLuo for RoHS compliance certificates.

All standard products are RoHS compliant.