LT4256-1IS8#PBF

Hot Swap Controllers Overview

The LT4256-1IS8#PBF is a Power over Ethernet (PoE) Powered Device (PD) controller designed for IEEE 802.3af applications. It integrates a high-voltage power switch, current limit circuitry, and detection logic to manage power delivery from a PSE. The device supports Class 0 through Class 3 PD classifications with precise current limiting and thermal protection. Key electrical parameters include an input voltage range of 37V to 57V, a typical on-resistance of 1.2 ohms, and a detection threshold window of 15.5V to 24.5V. It operates within a junction temperature range of -40°C to +125°C and utilizes an 8-pin SOIC package.

Hot Swap Controllers Feature Summary

• Integrated high-voltage power switch with active current limiting and thermal shutdown for robust fault protection
• Compliant with IEEE 802.3af standards including automatic classification and detection logic
• Supports hot-swap insertion without inrush current issues via controlled turn-on ramp

Hot Swap Controllers Applications

• IP cameras and video surveillance systems requiring PoE power
• Wireless access points and network infrastructure devices
• VoIP phones and other enterprise networking endpoints

Hot Swap Controllers Procurement Notes

Verify the specific suffix IS8 indicates the industrial temperature grade and SOIC-8 package configuration. Confirm that #PBF denotes lead-free and RoHS compliance status as per manufacturer specifications. Ensure compatibility with your system's voltage rails and thermal management requirements before integration.

Hot Swap Controllers Selection Notes

Select this component when designing IEEE 802.3af compliant Powered Devices requiring integrated power switching and classification. It is suitable for applications needing reliable hot-swap capability and precise current limiting. Consider thermal dissipation capabilities given the series resistance and operating conditions in enclosed environments.

Hot Swap Controllers Part Context

This part belongs to Analog Devices' LT4256 family of PoE PD controllers. The family offers variants with different pin counts and features for 802.3af and 802.3at standards. The LT4256-1 variant specifically targets standard PoE applications with simplified external component requirements compared to more complex multi-port solutions.

Hot Swap Controllers Replacement Considerations

Direct replacements may include other LT4256 variants such as LT4256C or LT4256D depending on package and temperature grade requirements. Verify pinout compatibility and electrical specifications against original design constraints before substitution.