Linear Technology LTC4257CS8-1#PBF
- Part Number:
- LTC4257CS8-1#PBF
- Manufacturer:
- Linear Technology
- Ventron No:
- 3267041-LTC4257CS8-1#PBF
- Description:
- IC POE 802.3AF CONTROLLER 8-SOIC
- ECAD Model:
-
- Datasheet:
- LTC4257CS8-1#PBF
Description
The LTC4257-1 is a complete Power over Ethernet (PoE) interface controller for Powered Devices (PDs) in IEEE 802.3af systems. It integrates:
25k signature resistor with disable
Programmable classification current source (Class 0-4)
Precision dual-level current limit
Undervoltage lockout
Thermal overload protection
Power good signal
Features
Onboard 100V, 400mA power MOSFET
Precision dual-level current limit
Onboard 25k signature resistor with disable
Programmable classification current (Class 0-4)
Undervoltage lockout
Thermal overload protection
Power good signal
Available in 8-pin SO and low-profile (3mm x 3mm) DFN packages
Applications
IP phone power management
Wireless access points
Telecom power control
The LTC4257-1 is a complete Power over Ethernet (PoE) interface controller for Powered Devices (PDs) in IEEE 802.3af systems. It integrates:
25k signature resistor with disable
Programmable classification current source (Class 0-4)
Precision dual-level current limit
Undervoltage lockout
Thermal overload protection
Power good signal
Features
Onboard 100V, 400mA power MOSFET
Precision dual-level current limit
Onboard 25k signature resistor with disable
Programmable classification current (Class 0-4)
Undervoltage lockout
Thermal overload protection
Power good signal
Available in 8-pin SO and low-profile (3mm x 3mm) DFN packages
Applications
IP phone power management
Wireless access points
Telecom power control
Linear Technology LTC4257CS8-1#PBF technical specifications, attributes, parameters and parts with similar specifications to Linear Technology LTC4257CS8-1#PBF.
- Factory Lead Time8 Weeks
- Package / Case8-SOIC (0.154, 3.90mm Width)
- Surface MountYES
- Operating Temperature0°C~70°C
- PackagingTube
- Published2005
- JESD-609 Codee3
- Part StatusActive
- Moisture Sensitivity Level (MSL)1 (Unlimited)
- Number of Terminations8
- ECCN CodeEAR99
- Terminal FinishMatte Tin (Sn)
- Additional FeatureREQUIRES A NEGATIVE SUPPLY OF 48V
- SubcategoryPower Management Circuits
- TechnologyCMOS
- Voltage - Supply57V Max
- Terminal PositionDUAL
- Terminal FormGULL WING
- Peak Reflow Temperature (Cel)260
- Number of Functions1
- Reflow Temperature-Max (s)30
- Base Part NumberLTC4257
- Pin Count8
- JESD-30 CodeR-PDSO-G8
- Number of Channels1
- Adjustable ThresholdNO
- Power - Max12.95W
- Current - Supply3mA
- Supply Current-Max (Isup)3mA
- Internal Switch(s)Yes
- Standards802.3af (PoE)
- Auxiliary SenseNo
- Length4.9025mm
- Width3.899mm
- RoHS StatusROHS3 Compliant
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