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Product Detailed Parameters
- Description：IC POE CNTRL 1 CHANNEL 8SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SO
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Overview
The LTC4257IS8#PBF is a Powered Device (PD) interface controller compliant with the IEEE 802.3af standard for Power over Ethernet (PoE). It integrates complete signature and power management functions within an 8-lead MSOP package. The device operates with a maximum supply voltage of 57V and supports a current limit of 375mA. It features a maximum on-resistance of 2 Ohms and draws a typical operating supply current of 3mA. The component is rated for industrial temperatures ranging from -40°C to +85°C.
Feature Summary
- Integrates complete signature detection and power interface control for IEEE 802.3af PD applications
- Provides internal control logic for power switch management and protection
- Supports hot insertion capabilities for powered devices
Applications
- IEEE 802.3af Powered Device (PD) systems
- Power over Ethernet (PoE) interface controllers
- Network endpoint devices requiring integrated PoE power management
Procurement Notes
Verify the specific suffix and package configuration against the manufacturer's official datasheet to ensure compatibility with your design requirements. Confirm that the component meets all relevant industry standards and environmental regulations applicable to your target market before finalizing procurement decisions.
Selection Notes
Select this component when designing IEEE 802.3af compliant Powered Devices requiring an integrated solution for signature detection and power switching. Ensure the system voltage does not exceed the 57V maximum rating and that the thermal environment remains within the specified -40°C to +85°C operating range for reliable performance.
Part Context
This part belongs to the LTC4257 series of PoE interface controllers manufactured by Analog Devices. It is designed specifically for Powered Devices in Ethernet networks, simplifying the implementation of power delivery by combining signature verification and power switch control into a single compact package.
Replacement Considerations
Consult the official Analog Devices documentation for verified substitute part numbers or pin-compatible alternatives within the same product family.
