PCA9518APW,518

Specialized Overview

The PCA9518APW,518 is an expandable five-channel I2C-bus hub manufactured by NXP Semiconductors. It operates within a supply voltage range of 2.3 V to 3.6 V and supports clock frequencies up to 400 kHz. The device features open-drain inputs and outputs with 5 V tolerance on the I2C-bus and enable pins. It provides ESD protection exceeding 2000 V HBM and includes active HIGH individual repeater enable inputs. The component is housed in a TSSOP20 package (SOT360-1) and functions as a bidirectional buffer for both data and clock lines.

Specialized Feature Summary

• Expandable 5-channel bidirectional buffer architecture
• I2C-bus and SMBus compatibility with arbitration support
• Active HIGH individual repeater enable inputs
• Powered-off high-impedance I2C-bus pins

Specialized Applications

• Extending I2C-bus systems beyond standard capacitance limits
• Creating multiple master capable bus segments
• Connecting devices operating at different voltage levels

Specialized Procurement Notes

Verify the specific ordering suffix

Specialized Selection Notes

Select this component when expanding I2C-bus networks requires buffering both SDA and SCL lines without functional degradation. It is suitable for applications needing multiple masters per segment or isolation between bus loads. Ensure the system voltage falls within the 2.3 V to 3.6 V range and that pull-up resistors are correctly sized for the desired bus speed.

Specialized Part Context

This part belongs to the PCA9518A series, which represents a wider voltage range version of the original PCA9518. It improves partial power-down performance by maintaining high-impedance states when VDD is below 2.0 V. Unlike the PCA9515/16, it cannot be connected in series but allows clustering via expansion pins.

Specialized Replacement Considerations

The PCA9518AD serves as a pin-compatible alternative in an SO20 package. Other PCA9518A variants exist in different packages, but direct substitution requires verifying package dimensions and electrical characteristics against the current design requirements.