HCPL-7721

Logic Output Optoisolators Overview

The HCPL-7721 is a high-speed optocoupler featuring a single channel with a data rate of 25 Mb/s. It utilizes CMOS technology for low power consumption and includes an integrated LED driver. The device offers a propagation delay of up to 40 ns and a common mode rejection ratio of at least 10 kV/µs. Operating temperatures range from -40°C to 85°C, with an isolation voltage of 3750 Vrms. It supports a forward current of 10 mA and provides push-pull output.

Logic Output Optoisolators Feature Summary

• High-speed digital transmission capability with 25 Mbps data rate
• Integrated CMOS LED driver for low power operation
• High common mode transient immunity ensuring signal integrity
• CMOS logic compatibility without external components

Logic Output Optoisolators Applications

• Industrial digital fieldbus isolation such as CC-Link, DeviceNet, and PROFIBUS
• Microprocessor interface and data transfer systems
• AC plasma display panel level shifting
• Computer peripheral interfaces

Logic Output Optoisolators Procurement Notes

Verify the specific package variant required, as the HCPL-7721 series includes both through-hole PDIP-8 and surface-mount SO-8 options. Confirm insulation voltage ratings, noting that standard models provide 3750 Vrms while specific suffixes may offer higher isolation. Ensure the selected part aligns with the necessary safety certifications like UL 1577 or IEC standards for the target application environment.

Logic Output Optoisolators Selection Notes

Select this component when high-speed data isolation is critical in noisy industrial environments. The integrated LED driver simplifies circuit design by reducing external component count. Consider the operating temperature range and isolation requirements to ensure compatibility with system constraints. Verify logic level compatibility with the driving microcontroller to guarantee reliable signal transmission across the isolation barrier.

Logic Output Optoisolators Part Context

The HCPL-7721 belongs to Broadcom's HCPL series of high-speed optocouplers. This family is designed for applications requiring fast data rates and robust noise immunity. The series leverages advanced CMOS IC technology to achieve performance levels comparable to direct digital connections while maintaining electrical isolation. It serves as a bridge between different voltage domains in complex electronic systems.

Logic Output Optoisolators Replacement Considerations

Direct substitutes within the same product line include HCPL-7721-000E. Other compatible variants may exist depending on packaging preferences, such as surface-mount versions. Always verify pinout compatibility and electrical specifications before substitution to ensure seamless integration into existing designs.