LTC4257

RECOMMENDED FOR NEW DESIGNS

IEEE 802.3af PD Power over Ethernet Interface Controller

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $1.19

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Part Details

Complete Power Interface Port for IEEE 802.3af^® Powered Devices (PDs)
Onboard 100V, 400mA Power MOSFET
Precision Input Current Limit
Onboard 25k Signature Resistor
Programmable Classification Current (Class 0-4)
Undervoltage Lockout
Smart Thermal Protection
Power Good Signal
Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages

Part Models: 8
1ku List Price: Starting From $1.19

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4257CDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257CDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257IDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257IDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4257IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC4257CS8#PBF	PRODUCTION
LTC4257CS8#TRPBF	PRODUCTION
LTC4257IS8#PBF	PRODUCTION
LTC4257IS8#TRPBF	PRODUCTION
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0026_Form Material_Report Delta Qualification Matrix
LTC4257CS8#PBF	PRODUCTION
LTC4257CS8#TRPBF	PRODUCTION
LTC4257IS8#PBF	PRODUCTION
LTC4257IS8#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
PoE Powered Device (PD) 1
LT4275	RECOMMENDED FOR NEW DESIGNS	LTPoE++/PoE+/PoE PD Controller
Power Monitors 1
LT2940	PRODUCTION	Power and Current Monitor

Parts	Product Life Cycle	Description
LTC4257-1	RECOMMENDED FOR NEW DESIGNS	IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Limit

Tools & Simulations

LTspice 1

LTC4257 - Power-over-Ethernet (PoE) Interface Controllers

Models for the following parts are available in LTspice:

LTC4257
LTC4257-1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Latest Discussions

3 Years Ago

LTC4257

Part Details

Documentation

Data Sheet 1

Reliability Data 3

Design Note 1

Technical Articles 1

Video 1

Product Selector Card 3

Hardware Ecosystem

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

Latest Discussions

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