PCA9548AD,112

Specialized Overview

The PCA9548AD,112 is an octal bidirectional translating switch controlled via the I²C-bus. It fans out one upstream SCL/SDA pair to eight downstream pairs (channels). The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses by using the VDD pin to limit the maximum passed high voltage. It features an active LOW reset input for bus recovery and three hardware address pins allowing up to eight devices on a single bus. Operating power supply voltage ranges from 2.3 V to 5.5 V with inputs tolerant to 6 V. The component operates at clock frequencies from 0 Hz to 400 kHz and is housed in a 24-lead SO24 package.

Specialized Feature Summary

• Octal bidirectional translating switches
• I²C-bus interface logic compatible with SMBus standards
• Active LOW reset input for bus fault recovery
• Voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses

Specialized Applications

• Expanding a single I²C bus into multiple isolated channels
• Connecting devices with different operating voltages on the same bus
• Recovering from stuck-low bus conditions via hardware reset

Specialized Procurement Notes

Verify the ordering suffix ,112 indicates the SO24 tube packaging configuration as specified in the NXP data sheet. Confirm the manufacturer is NXP Semiconductors or NXP USA Inc. Ensure the part number matches the specific package type required for the design. Cross-reference the full orderable part number against official distributor catalogs to ensure accuracy before procurement.

Specialized Selection Notes

Select this component when an I²C master needs to access multiple downstream buses or devices with varying voltage levels. The PCA9548AD,112 is suitable for designs requiring voltage translation between 1.8 V, 2.5 V, 3.3 V, and 5 V systems. Consider the SO24 package dimensions and thermal characteristics during PCB layout. Ensure the application does not exceed the maximum bus capacitance limits when enabling multiple channels simultaneously.

Specialized Part Context

The PCA9548AD,112 belongs to the PCA9548A family of I²C/SMBus multiplexers and switches. This family includes variants such as PCA9548ABS and PCA9548APW, which offer HVQFN24 and TSSOP24 packages respectively. All variants share the same core functionality but differ in physical package and packing method. The PCA9548AD specifically utilizes the SO24 plastic small outline package.

Specialized Replacement Considerations

Texas Instruments offers the PCA9548ADB and PCA9548ADBG4 as direct functional equivalents. Verify pin compatibility and electrical specifications before substitution.