PCA9545AD,118

Specialized Overview

The PCA9545AD,118 is a quad bidirectional translating switch controlled via the I2C-bus. It fans out one upstream SCL/SDA pair to four downstream SCx/SDx channel pairs. The device supports an operating power supply voltage range of 2.3 V to 5.5 V and allows voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. It features four active LOW interrupt inputs (INT0 to INT3) and one open-drain interrupt output (INT). Channel selection is performed via the I2C-bus control register, allowing any combination of channels to be enabled. The component operates within a temperature range of -40 °C to +85 °C and is housed in a SO20 package.

Specialized Feature Summary

• Provides four independent bidirectional switches for I2C bus expansion
• Supports voltage level translation across multiple bus standards
• Includes interrupt logic with dedicated inputs and a combined output
• Features an active LOW reset input for bus recovery

Specialized Applications

• Expanding I2C bus capacity by connecting multiple slave devices
• Isolating stuck-low conditions on specific I2C branches
• Interfacing components operating at different voltage levels

Specialized Procurement Notes

Verify the ordering suffix '118' corresponds to the SO20 package in reel packing format. Confirm that the manufacturer designation matches NXP Semiconductors specifications. Ensure the part number aligns with the required thermal and electrical characteristics for the target application environment.

Specialized Selection Notes

Select this variant when a surface-mount SO20 package is required for PCB layout constraints. Verify that the system design accommodates the two address pins (A0, A1) to allow up to four devices on the same bus. Ensure pull-up resistors are correctly sized for the intended bus capacitance and speed requirements.

Specialized Part Context

This component belongs to the PCA9545A family of I2C multiplexers and switches. It shares functional similarities with variants like the PCA9545ABS and PCA9545APW, differing primarily in the physical package type. The family is designed for managing complex I2C networks requiring voltage translation and fault isolation.

Specialized Replacement Considerations

Direct pin-compatible replacements include the PCA9545ABS,118 and PCA9545APW,118. These alternatives offer identical electrical functionality but utilize HVQFN20 and TSSOP20 packages respectively. Verify footprint compatibility before substitution.