HCPL-0661

The HCPL-0661 is a high-speed optocoupler from Broadcom, designed for digital logic interfacing and isolation. It features a GaAsP LED optically coupled to an integrated high-gain photodetector, providing 3.75 kV RMS isolation and fast response times (15 ns propagation delay).
Key features:
- High-speed operation (up to 25 Mbps).
- Low power consumption (5 mA LED drive current).
- Wide supply voltage range (3V to 5.5V).
- CMOS/TTL-compatible outputs.
Applications include:
- Digital isolation in industrial systems.
- Data communication (RS-232, RS-485).
- Microprocessor interfacing.
Its compact DIP-8/SOIC-8 package makes it suitable for space-constrained designs. The HCPL-0661 ensures reliable signal transmission while maintaining high noise immunity, making it ideal for harsh environments.

Equivalent products to the HCPL-0661 (high-speed optocoupler) include:
- HCPL-0601 (similar specs, lower speed)
- HCPL-0631 (dual-channel version)
- 6N137 (common alternative, slower)
- FOD817 (budget option, slower)
- TLP2361 (higher speed, Toshiba)
Check datasheets for exact compatibility in your application.

The HCPL-0661 is a high-speed optocoupler with the following key features:
- High Speed: 10 MBd (Mega Baud) data rate.
- Low Propagation Delay: Typically 100 ns.
- CMOS/TTL Compatibility: Works with 5V logic levels.
- High Common-Mode Rejection (CMR): 15 kV/µs for noise immunity.
- Wide Supply Voltage Range: 3V to 5.5V for flexibility.
- Single-Channel Isolation: Provides 2500 Vrms (min) isolation.
- Compact Package: 8-pin DIP or SOIC options.
- Low Power Consumption: Suitable for energy-efficient designs.
Ideal for digital isolation in industrial, medical, and communication systems.

The HCPL-0661 is an 8-pin optocoupler designed for high-speed digital logic interfacing. Key features include:
- Pin Functions:
- Pins 1 & 2: Anode and cathode of the input LED.
- Pin 3: No connection (NC).
- Pins 4 & 5: Ground (GND) for the output side.
- Pin 6: Output (open-collector transistor).
- Pin 7: VCC (output supply voltage, typically +5V).
- Pin 8: No connection (NC).
- Function:
- Provides 10 Mbps high-speed signal isolation.
- 3.3V/5V TTL/CMOS compatibility.
- Common applications: digital isolation, noise immunity in PLCs, and microcontroller interfacing.
Compact and reliable, it ensures signal integrity while isolating high-voltage circuits.

The HCPL-0661 is available in an 8-pin DIP (Dual In-line Package) and SOIC-8 (Small Outline Integrated Circuit) package. These surface-mount and through-hole options provide flexibility for different PCB designs while maintaining compactness and reliability.