Broadcom HCPL-3700-000E Optocoupler, DIP-8, 3.75kV Isolation

The Broadcom HCPL-3700-000E is an advanced isolated voltage and current threshold detection optocoupler, engineered for precision and reliability in demanding electronic applications. This device employs sophisticated threshold sensing input buffer ICs, allowing users to programme the detection threshold levels across a wide voltage range using a single external resistor. This design ensures consistent and accurate sensing tailored to specific circuit requirements.

The integrated input buffer is packed with protective and performance-enhancing features. It incorporates built-in hysteresis to provide superior noise immunity and robust switching stability. A convenient diode bridge permits easy use with both AC and DC input signals, simplifying the interface design. For robust protection, the buffer includes internal clamping diodes that shield both the buffer and the internal LED from potentially damaging over-voltage and over-current transients, ensuring long-term component integrity.

A key innovation of this optocoupler is that threshold sensing is performed before driving the LED. This architecture ensures that the programmed threshold levels remain completely unaffected by any variations in the optical coupling efficiency between the LED and the photodetector, guaranteeing precise and stable operation.

Primary Applications

• Limit switch sensing
• Low voltage detector circuits
• AC mains and DC link voltage detection
• Relay contact and coil voltage monitoring
• General current sensing
• Microprocessor interfacing for signal isolation

Key Features

• Accepts either AC or DC input signals
• Fully programmable sense voltage via an external resistor
• Integrated hysteresis for exceptional noise immunity
• Logic compatible output for easy integration with digital systems
• Threshold levels are guaranteed to remain stable, *