KPC4502
High-speed photocoupler with 1Mbps data rate, 2500V isolation, and DIP-8 package for digital signal isolation.
Product Overview
Description
The KPC4502 is a high-speed photocoupler designed for digital signal isolation with data rates up to 1Mbps.
Features an open-collector output with internal shielding for improved common-mode transient immunity (CMTI).
Ideal for isolated communication interfaces, digital isolators, and high-speed switching applications.
Product Series
KPC
Primary Application
Isolated communication
Key Features
- 1 Mbps high speed
- 2500V isolation
- High CMTI 10kV/us
- Open collector output
- Internal shielding
- Low propagation delay
Specifications
| Output Type | Open Collector |
|---|---|
| Isolation Voltage | 2500Vrms |
| Data Rate | 1 Mbps max |
| Propagation Delay | 1.5us typical |
| CMTI | 10kV/us min |
| Forward Voltage | 1.4V typical |
| Forward Current | 20mA max |
| Package | DIP-8 |
| Operating Temperature | -40°C to +85°C |
Applications
Isolated communication
Communication and interface
Digital isolators
Electronic system design
Switching power supplies
Electronic system design
Inverter interfaces
Communication and interface
Microprocessor isolation
Electronic system design
FAE Expert Insights
"For high-speed digital isolation, the KPC4502 delivers excellent performance at a competitive price point. The 1Mbps data rate handles most industrial communication protocols comfortably. What impresses me most is the CMTI (Common Mode Transient Immunity) - I've tested this in noisy motor drive environments where other photocouplers failed, and the KPC4502 kept working flawlessly. The open-collector output gives flexibility in logic level translation. Design recommendation: use a 4.7kΩ pull-up resistor for 5V logic, or 2.2kΩ for 3.3V. Always keep the LED current around 10-15mA for optimal speed."
High-speed 1Mbps photocoupler for digital isolation applications
— Senior FAE Team, BeiLuo
Frequently Asked Questions
What is CMTI and why is it important?
CMTI (Common Mode Transient Immunity) measures the photocoupler's ability to reject fast voltage transients between input and output. Higher CMTI (10kV/us for KPC4502) ensures reliable operation in noisy environments like motor drives and power supplies. It's critical for preventing false triggering.
Higher CMTI for noisy environments.
What is the maximum switching frequency of KPC4502?
The KPC4502 has a typical switching time of 2-4μs, allowing switching frequencies up to 50-100kHz depending on load conditions. For higher frequency applications, consider high-speed types like KPC series.
Suitable for general switching up to 50kHz.
Can KPC4502 be used with 3.3V logic?
Yes, KPC4502 can be used with 3.3V logic. Ensure proper current limiting resistor calculation: R = (3.3V - 1.2V) / If. For 10mA LED current, use approximately 200Ω resistor. Verify output current meets your load requirements based on CTR.
Use appropriate current limiting resistor for 3.3V operation.
What is the isolation resistance of KPC4502?
The KPC4502 provides typical isolation resistance of 10^12 ohms minimum. This high isolation resistance ensures excellent DC isolation between input and output circuits, critical for safety and noise immunity.
High isolation resistance ensures excellent DC isolation.
How do I protect KPC4502 from ESD?
While KPC4502 has internal ESD protection, for harsh environments: (1) Use proper grounding techniques; (2) Add external TVS diodes for additional protection; (3) Handle with ESD precautions during assembly; (4) Maintain proper PCB layout with adequate spacing.
Use standard ESD precautions during handling and assembly.