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LTC4257IS8 LTC4257IS8 is an IEEE 802.3af compliant PD interface controller. It features a 350mA current limit, 2Ω on-resistance, and operates from -57V supply.
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LTC4257IS8

Available from 1 distributors
Mfr Name: LT
LT
LTC4257IS8 is an IEEE 802.3af compliant PD interface controller. It features a 350mA current limit, 2Ω on-resistance, and operates from -57V supply.
✓ Total Stock: 3,512 pcs

LTC4257IS8 Available from 1 distributor

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✓ Non-Authorised
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Optech Co.,Limited ✓
Non-Authorised Inventory information
3,512 pcs
On Request
3512 pcs On Request 1 On Request On Request 17+ On Request On Request
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LTC4257IS8 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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LTC4257IS8 Description

Short technical summary and product information.

The LTC4257IS8 is an IEEE 802.3af compliant Powered Device (PD) interface controller designed for Power over Ethernet applications. It integrates a 350mA current limit and a 2Ω on-resistance switch to ensure safe and efficient power delivery. The device operates from an input supply voltage of -57V (typical for PoE) and draws only 3mA of supply current. It is specified for industrial temperature range from -40°C to +85°C, making it suitable for demanding environments.

 

As a PD interface controller, the LTC4257IS8 handles the signature and classification functions required by the IEEE 802.3af standard. It provides a robust solution for implementing powered devices such as IP cameras, VoIP phones, and wireless access points. The negative operating voltage is typical for PoE systems where the power is supplied over the Ethernet cable with a negative voltage relative to ground.

 

The device is offered in a standard IC package, though package details are not available in the provided data. It is designed for surface-mount assembly and is compatible with standard PCB manufacturing processes.

LTC4257IS8 Quick Information

Product Type: PoE Powered Device Interface Controller
Canonical Name: LTC4257IS8 IEEE802.3af Powered Device Interface Controller
Subcategory: Hot Swap Controllers

LTC4257IS8 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

LTC4257IS8 Features

  • IEEE 802.3af compliant PD interface controller.
  • 350mA current limit for safe operation.
  • 2Ω on-resistance for low power loss.
  • Operates from -57V supply voltage.
  • Wide temperature range -40 to 85°C.

LTC4257IS8 Applications

  • Used in Power over Ethernet powered devices.
  • Ideal for IP cameras and VoIP phones.
  • Suitable for wireless access points.
  • Enables IEEE 802.3af compliant PD design.

LTC4257IS8 FAQs

6 frequently asked questions generated from this part’s specifications.
What is the operating voltage of the LTC4257IS8?

-57V

What is the operating temperature range?

-40°C to +85°C

What is the current limit?

350 mA

What is the on-resistance?

2 Ohms

What standard does the LTC4257IS8 comply with?

IEEE 802.3af

What type of device is the LTC4257IS8?

Powered Device (PD) interface controller

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