PCA9516AD,118

Signal Buffers, Repeaters, Splitters Overview

The PCA9516AD,118 is a CMOS integrated circuit designed for I2C-bus and SMBus systems. It functions as a five-channel bidirectional hub repeater that buffers both data (SDA) and clock (SCL) lines to extend the bus capacitance limit of 400 pF per segment. The device supports Standard-mode and Fast-mode operations up to 400 kHz with an operating supply voltage range of 2.3 V to 3.6 V. It features 5.5 V tolerant pins and open-drain inputs/outputs. The component is housed in a 16-lead SO plastic small outline package (SO16).

Signal Buffers, Repeaters, Splitters Feature Summary

• Five-channel bidirectional buffering capability for I2C-bus expansion.
• Lock-up free operation using static offset voltage levels between input and output stages.
• Supports arbitration and clock stretching across the repeater without functional degradation.
• Powered-off high-impedance state prevents current leakage when VCC is off.

Signal Buffers, Repeaters, Splitters Applications

• Expanding I2C-bus systems by dividing the network into multiple segments with isolated capacitance limits.
• Interfacing buses operating at different voltage levels, such as 3.3 V and 5 V.
• Connecting Standard-mode (100 kHz) and Fast-mode (400 kHz) devices on separate segments.

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the package type matches the required PCB footprint, specifically the SO16 variant for this suffix. Confirm the temperature range covers the intended operational environment. Ensure the design accounts for the inability to cascade these specific repeaters in series due to voltage level shifting characteristics.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when system design requires expanding beyond the standard 400 pF I2C-bus capacitance limit across five distinct branches. It is suitable for applications needing isolation between different bus speeds or voltages. Note that it cannot be placed in series with other PCA951xA devices; use PCA9512A or PCA9513A if cascading is required.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9516AD is part of the PCA951xA family of I2C-bus hubs manufactured by NXP Semiconductors. This family includes variants like the PCA9516APW (TSSOP16), PCA9515ADR (dual bidirectional repeater), and PCA9517ADMR2G (voltage level translator). The AD suffix specifically denotes the SO16 package format.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers: PCA9516APW,118 (identical function, TSSOP16 package).