1. Products
  2. Power Monitor, Control, and Protection
  3. Power-over-Ethernet (PoE) Interface Controllers
  4. PoE Power Sourcing Equipment (PSE)
  5. LTC4258

Alternative Parts


Features and Benefits

  • Controls Four Independent -48V Powered Ethernet Ports
  • Each Port Includes:
    • IEEE 802®.3af Compliant PD Detection and Classification
    • Output Current Limit with Foldback
    • Short-Circuit Protection with Fast Gate Pull-Down
    • PD Disconnect Using DC Sensing
    • Power Good Indication Operates Autonomously or by I2C Control
  • 4-Bit Programmable Digital Address Allows Control of Up to 64 Ports
  • Programmable INT Pin Eliminates Software Polling
  • Current and Duty Cycle Limits Protect External FETs
  • Available in a 36-Pin SSOP Package

Product Details

The LTC4258 is a quad –48V Hot Swap controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It consists of four independent ports, each with output current limit, short-circuit protection, complete Powered Device (PD) detection and classification capability, and programmable PD disconnect using DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4258 can implement a complete IEEE 802.3af-compliant PSE.

The LTC4258 can operate autonomously or be controlled by an I2C serial interface. Up to 16 LTC4258s may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault conditions are optionally signaled with the INT pin to eliminate software polling.

External power MOSFETs, current sense resistors and diodes allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events.

The LTC4258 is available in a 36-pin SSOP package.

Analog Devices also provides solutions for 802.3af PD applications with the LTC4257, LTC4257-1, and LTC4267.


  • IEEE 802.3af Compliant Endpoint and Midspan Power Sources
  • IP Phone Systems
  • DTE Power Distribution

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Product Recommendations

LTC4258 Companion Parts

Recommended µModule Isolator

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4258CGW#PBF Material Declaration Reliability Data 36-Lead SSOP (Wide 0.3 Inch)
LTC4258CGW#TRPBF Material Declaration Reliability Data 36-Lead SSOP (Wide 0.3 Inch)
Wafer Fabrication Data R384 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



A Sample link will be shown above, next to the part, only for parts that are included in our sample program. Selecting the Sample button will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help