MAX5945EAX+T

Overview

The MAX5945EAX+T is a four-channel Power over Ethernet (PoE) controller compliant with the IEEE 802.3af standard, designed for use as a Powered Device (PD). It operates within a supply voltage range of 32V to 60V and draws a typical supply current of 4.2mA. The device supports a maximum power output of 15.4W per channel and features no internal switches, requiring external MOSFETs. It is housed in a 36-SSOP package and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports four independent PoE channels compliant with IEEE 802.3af standards
• Integrates detection and classification logic for powered devices
• Includes a built-in 12V buck converter for low-cost PD solutions
• Operates without internal switches to reduce component count

Applications

• Power-over-Ethernet midspan insertion points
• Powered endpoint device implementations
• Network infrastructure equipment requiring 802.3af compliance

Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging rather than tube, as the base part MAX5945EAX+ is documented in tubes. Confirm availability status, as the base product line may be obsolete or subject to limited supply constraints. Ensure the selected variant matches the required manufacturing packaging format for automated assembly processes.

Selection Notes

Select this component when designing IEEE 802.3af compliant powered devices requiring four independent power channels. The integrated 12V buck converter simplifies design by reducing external components. Verify that external MOSFETs are specified, as the controller lacks internal switching elements. Ensure the application environment stays within the -40°C to +85°C operating temperature range.

Part Context

The MAX5945 belongs to the Maxim Integrated PoE controller family, specifically engineered for cost-effective powered device applications. It provides a complete solution for implementing 802.3af PDs by combining control logic with power conversion capabilities. The EAX+ designation identifies the specific 36-SSOP package variant suitable for surface-mount assembly.

Replacement Considerations

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