CPC5902G

## Product Overview

The IXYS Corporation CPC5902G is a high-performance photorelay featuring a gallium arsenide (GaAs) infrared LED input coupled with a MOSFET output, designed for electrical isolation and precise switching in low-voltage, high-speed applications. It is widely used in applications such as telecommunications, instrumentation, industrial controls, and test equipment. The device offers excellent isolation between input and output, fast switching times, low on-resistance, and robust electrical and thermal performance.

## Electrical Characteristics

* Input LED Forward Voltage (V_F): 1.2 V typical at 10 mA forward current, ensuring compatibility with standard control signals.
* Input LED Reverse Voltage (V_R): 6 V maximum, protecting the LED from inadvertent reverse bias conditions.
* Input Forward Current (I_F): 10 mA typical operating, with absolute maximum of 50 mA, allowing flexible drive design.
* Output MOSFET Continuous Drain Current (I_D): 200 mA maximum at ambient 25°C, suitable for low-power switching tasks.
* On-State Voltage (V_DS(on)): 1.5 V maximum at I_D = 200 mA, minimizing conduction losses.
* Leakage Current (I_D(off)): 1 μA typical at V_DS = 30 V, enabling reliable off-state isolation.
* Output Voltage (V_DS): 30 V maximum, supporting a wide range of low-voltage switching applications.
* Isolation Voltage (V_ISO): 3750 Vrms minimum for 1 minute, providing high isolation between input and output.
* Input-Output Capacitance (C_io): 2 pF typical, reducing signal coupling and improving high-frequency performance.

## Switching Characteristics

* Turn-On Time (t_on): 5 μs typical, allowing rapid response for digital control signals.
* Turn-Off Time (t_off): 5 μs typical, ensuring minimal propagation delay and fast switching performance.
* Propagation Delay: 5 μs typical from input LED activation to output MOSFET conduction.
* Rise Time (t_r): 1 μs typical, supporting fast voltage transitions.
* Fall Time (t_f): 1 μs typical, ensuring rapid discharge for responsive switching.
* Input-Output Delay Matching: Low variation in propagation delay between rising and falling edges, enhancing signal integrity.

## Thermal Characteristics

* Operating Temperature Range (T_A): -40°C to +85°C, suitable for industrial, automotive, and commercial environments.
* Storage Temperature Range (T_STG): -40°C to +125°C, supporting safe handling and storage.
* Thermal Resistance, Junction-to-Ambient (R_thJA): 400 °C/W typical in free-air conditions, necessitating careful PCB design for heat dissipation.
* Power Dissipation (P_D): 300 mW maximum for continuous operation, with proper heat management and ambient considerations.

## Package and Mechanical Details

* Package Type: 6-Pin Small Outline Transistor (SOT-23) or equivalent miniature surface-mount package.
* Lead Pitch: 0.95 mm typical, compatible with standard surface-mount technology assembly.
* Package Height: 1.2 mm maximum, allowing compact design integration.
* Lead Material: Alloy with tin finish, supporting reliable soldering and low contact resistance.
* Marking: Device part number printed on package for traceability and identification.

## Functional Features

* Electrical Isolation: Provides galvanic separation of 3750 Vrms, protecting sensitive control circuits from high-voltage disturbances.
* Low On-Resistance: MOSFET R_DS(on) minimizes voltage drop and conduction losses for efficient switching.
* Fast Switching: Microsecond-scale turn-on and turn-off times enable high-speed control of digital and analog signals.
* Low Input Current: Requires minimal drive current, reducing power consumption in the control circuitry.
* Wide Operating Temperature: Industrial temperature range ensures reliable performance under harsh environmental conditions.
* Compact Surface-Mount Package: Enables high-density PCB design and minimizes space requirements.

## Applications

* Telecommunication Equipment: Isolation and signal switching in line interfaces, modems, and network devices.
* Industrial Controls: Switching analog or digital signals in PLCs, motor controllers, and measurement systems.
* Instrumentation: Signal routing and isolation in measurement, test, and data acquisition systems.
* Audio and Video Switching: Low on-resistance and high linearity allow use in analog signal routing.
* Safety-Critical Systems: Electrical isolation for patient-connected devices or hazardous environment monitoring.
* Microcontroller Interface: Level shifting and galvanic isolation between digital logic and higher-voltage systems.

## Advantages

* High Isolation Voltage: Safely separates input and output for sensitive electronic circuits.
* Fast Response: Microsecond-scale switching allows precise timing control in fast digital applications.
* Low On-Resistance: Ensures minimal conduction losses and high efficiency in low-voltage circuits.
* Compact Footprint: Small surface-mount package enables integration into space-constrained designs.
* Wide Temperature Range: Supports industrial and automotive applications with reliable operation.
* Energy Efficiency: Low input drive requirements minimize overall system power consumption.

## Summary

The IXYS CPC5902G photorelay combines a low-power infrared LED input with a fast MOSFET output, providing galvanic isolation, low on-resistance, and rapid switching capabilities. It is ideal for industrial, telecommunications, instrumentation, and general-purpose electronic applications requiring reliable signal switching and isolation. The device’s compact surface-mount package, robust thermal and electrical ratings, and high isolation voltage make it a versatile and efficient solution for designers aiming to integrate high-speed, low-power, and high-reliability optically isolated switching functionality into their systems.