PCA9618UKZ

Signal Buffers, Repeaters, Splitters Overview

The PCA9618UKZ is a single-channel Fast-mode Plus I2C-bus repeater manufactured by NXP Semiconductors. It provides bidirectional buffering for SCL or SDA lines, enabling bus capacitance extension to 540 pF at 1 MHz and up to 4000 pF at lower speeds. The device operates with a supply voltage range of 2.2 V to 5.5 V and features overvoltage-tolerant data pins. Packaged in a WLCSP4 wafer-level chip-scale package (0.78 x 0.83 x 0.53 mm), it supports Standard, Fast, and Fast-mode Plus I2C devices as well as SMBus applications. Operating temperature ranges from -40 °C to +85 °C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Single-channel bidirectional buffer isolates bus capacitance while retaining all I2C operating modes
• Data pins are 5 V tolerant and remain high-impedance when the device is unpowered
• Includes internal glitch filter to ignore noise spikes rather than expanding them
• Provides propagation delay to create artificial hold time bridging I2C and SMBus specifications

Signal Buffers, Repeaters, Splitters Applications

• Extending I2C bus length by buffering SCL or SDA lines
• Voltage translation between different logic levels within an I2C system
• Creating effective data hold times for SMBus slaves requiring hold time relative to SCL
• Buffering master microcontroller I/O outputs that lack sufficient drive strength

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm datasheet revision status before design finalization. Ensure PCB footprint matches WLCSP4 dimensions. Validate soldering profile compliance for lead-free processes. Check moisture sensitivity level handling requirements during assembly.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when a single channel of I2C buffering is required. Use for applications needing capacitance isolation between bus segments. Choose for systems requiring voltage translation between 2.2 V and 5.5 V domains. Consider for designs needing specific propagation delay characteristics to meet hold time requirements.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9618 belongs to NXP's I2C interface IC family, specifically designed as a repeater. It complements multi-channel buffers like the PCA9617A by offering single-channel functionality. The UKZ suffix indicates the WLCSP4 package variant. This part enables flexible bus topology expansion including star and series configurations.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.