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Product Detailed Parameters
- Description：IC POE CNTRL 1 CHANNEL 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Type：Controller (PD)
- Number of Channels：1
- Power - Max：12.95 W
- Internal Switch(s)：Yes
- Auxiliary Sense：No
- Standards：802.3af (PoE)
- Voltage - Supply：57V (Max)
- Current - Supply：3mA
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：8-WFDFN Exposed Pad
- Supplier Device Package：8-DFN (3x3)
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Overview
The LTC4257IDD#TRPBF is a Power over Ethernet (PoE) Powered Device controller compliant with IEEE 802.3af standards, manufactured by Analog Devices Inc. It integrates a power switch and interface logic for PoE applications. The component is housed in an 8-lead DFN package designed for surface mount technology. It operates within a temperature range of -40°C to +85°C. The device supports classification detection and provides current limiting capabilities for connected loads.
Feature Summary
- Integrates IEEE 802.3af compliant Powered Device interface logic
- Includes integrated power switch for load control
- Supports classification detection for power negotiation
Applications
- IEEE 802.3af Powered Device implementations
- Power over Ethernet network endpoints
- Integrated circuit power management for LAN interfaces
Procurement Notes
Verify availability status as the part may be discontinued or subject to limited supply constraints. Confirm RoHS compliance details through official documentation. Ensure the specific suffix matches required packaging options. Cross-reference datasheet revisions for any functional updates prior to integration into new designs.
Selection Notes
Select this component for designs requiring integrated PoE PD functionality without external switching components. Consider the DFN-8 package size for space-constrained layouts. Verify thermal performance requirements against the specified operating temperature range. Ensure compatibility with upstream PSE classification protocols.
Part Context
This part belongs to the LTC4257 family of PoE controllers. It serves as a complete solution for Powered Devices, combining interface detection and power switching. The IDD suffix indicates the industrial temperature grade and DFN-8 package variant. It replaces older discrete solutions for PoE integration.
Replacement Considerations
LTC4257CS8-1#TRPBF: Similar PoE PD controller in SOIC-8 package. LTC4257IDD-1#PBF: Tube-packaged version of the same die. Verify pinout compatibility and package dimensions before substitution.
