MAX5940BESA+

Overview

The MAX5940BESA+ is an IEEE 802.3af compliant Power-over-Ethernet (PoE) Powered Device (PD) interface controller manufactured by Analog Devices Inc. under the Maxim Integrated brand. Designed for SMD/SMT installation in an 8-pin SOIC-Narrow package, it operates within a supply voltage range of 30 V to 67 V and supports a maximum power dissipation of 470 mW. The device functions across an extended temperature range from -40°C to +85°C with a typical operating supply current of 400 µA.

Feature Summary

• Provides detection signature compliance for IEEE 802.3af PoE standards
• Integrates PD interface control logic for Ethernet power applications

Applications

• Power Management systems
• Portable Devices
• Consumer Electronics
• Wireless infrastructure
• Security equipment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to limited availability status. Confirm RoHS compliance details and specific lot traceability requirements before procurement. Ensure packaging specifications match design constraints, as factory quantities may vary. Validate that the 8-SOIC footprint aligns with existing PCB layouts to prevent integration errors during assembly.

Selection Notes

Select this controller for designs requiring strict adherence to IEEE 802.3af classification protocols. The narrow SOIC-8 package suits space-constrained portable and wireless applications. Verify that the 30 V to 67 V input range matches the PoE source capabilities. Consider the 400 µA quiescent current for low-power battery-operated devices where efficiency is critical.

Part Context

Part of the MAX5940 series, which focuses on PoE interface solutions. It complements other Maxim Integrated PMICs like the MAX5937 hot-swap controllers. The device serves as a bridge between Ethernet data lines and internal DC-DC converters, enabling standard PoE deployment without complex discrete circuitry.

Replacement Considerations

The MAX5940AESA+ is a verified substitute within the same series. Both share identical functional specifications and pinouts. Verify package compatibility when swapping between these variants.