SI3400-BZ-GM

Overview

The SI3400-BZ-GM is a fully integrated Power over Ethernet (PoE) Powered Device (PD) interface and switching regulator compliant with IEEE 802.3af standards. Manufactured by Silicon Labs, this component operates within a supply voltage range of 2.8V to 57V and supports a maximum power output of 15W. It features an internal switch and is housed in a 20-VQFN package with a bare pad, designed for surface mount installation. The device functions as a DC/DC controller with comprehensive protection circuitry.

Feature Summary

• Fully integrated PoE PD interface and switching regulator
• IEEE 802.3af compliance
• Internal switch capability
• Comprehensive protection circuitry

Applications

• Non-isolated switching topology designs
• Isolated switching topology designs
• Power over Ethernet powered devices

Procurement Notes

Verify the specific suffix 'BZ' against the manufacturer's official documentation to confirm pinout, thermal characteristics, or material composition differences compared to standard variants. Confirm current availability status as distribution channels may list discontinued or obsolete stock. Ensure the 20-QFN package footprint matches the target PCB design requirements.

Selection Notes

Select this component for applications requiring a single-channel 802.3af compliant PoE solution with integrated regulation. Consider the 20-VQFN package size for space-constrained designs. Evaluate the need for isolated versus non-isolated topologies, as the device supports both. Verify that the 15W power limit meets the downstream load requirements.

Part Context

The SI3400 series includes variants such as SI3400, SI3401, and SI3402. The SI3400-BZ-GM specifically denotes a version within this family, sharing core functionality with other SI3400 models but potentially differing in packaging or qualification details. It serves as a complete solution for PoE PD implementation without external control logic.

Replacement Considerations

• SI3400-GM
• LTC4267
• LTC4267-1