Products > Integrated Circuits (ICs) > Power Management ICs > LT4321HUF#TRPBF

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  • Package/Case :
  • QFN-16
  • Product Categories :
  • OR Controllers, Ideal Diodes
  • RoHs Status:
  • Pb-free Halide free
  • Marking Code:
  • 4321
  • In-stock:
  • 309


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LT4321HUF#TRPBF Product Details

The LT®4321 is a dual ideal diode bridge controller that enables a Power over Ethernet (PoE) powered device (PD) to receive power in either voltage polarity from RJ-45 data pairs, spare pairs, or both. The LT4321HUF#TRPBF and eight N -channel MOSFETs replace the eight diodes in a passive PoE rectifier bridge. The LT4321HUF#TRPBF eases thermal design and increases delivered power. 

An internal charge pump allows an all-NMOS bridge eliminating larger and more costly PMOS switches. The LT4321HUF#TRPBF works with 2-pair and 4-pair applications. High impedance input sense pins prevent reverse current on unused pairs. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients. Unlike discrete ideal bridge solutions, the LT4321HUF#TRPBF will operate through transients without enabling the MOSFETs on unpowered pairs.


  • Reduces Heat, Eliminates Thermal Design Problems 
  • Maximizes Power Efficiency 
  • Less than 800µA Quiescent Operating Current 
  • Fully Compatible with IEEE 802.3 Detection and Classification 
  • IEEE 802.3 Compliant When Paired with a Powered Device (PD) Controller 
  • Works with 2-Pair and 4 -Pair PoE Applications 
  • Compatible with PoE, PoE+, and LTPoE++™ 
  • 100V Absolute Maximum Voltage 
  • H-Grade Version Operates Up to 125°C 
  • 16-Lead 4mm × 4mm QFN  Package


  • PoE/PoE+/ LTPoE++ Powered Devices 
  • DC Polarity Correction and Ideal Diode-ORing of Telecom Supplies


  • Reduces Heat, Eliminates Thermal Design Problems
  • Maximizes Power Efficiency
  • Less than 800μA Quiescent Operating Current
  • Fully Compatible with IEEE 802.3 Detection and Classification
  • IEEE 802.3 Compliant When Paired with a Powered Device (PD) Controller
  • Works with 2-Pair and 4-Pair PoE Applications
  • Compatible with PoE, PoE+, and LTPoE++™
  • 100V Absolute Maximum Voltage
  • H-Grade Version Operates Up to 125°C
  • 16-Lead 4mm × 4mm QFN Package


  • PoE/PoE+/ LTPoE++ Powered Devices
  • DC Polarity Correction and Ideal Diode-ORing of Telecom Supplies

LT4321HUF#TRPBF Pin Diagram
(Picture:Pinout / Diagram)

Technical Parameters

  • Type
  • Bridge Rectifier
  • FET Type
  • N-Channel
  • Ratio Input:Output
  • Bridge (2)
  • Internal Switch(s)
  • No
  • Current Supply
  • 32??A
  • Voltage Supply
  • 20V ~ 80V
  • Applications
  • Power Over Ethernet (PoE)
  • Operating Temperature
  • -40??C ~ 125??C
  • Mounting Type
  • Surface Mount
  • Package / Case
  • 16-WQFN Exposed Pad
  • Supplier Device Package
  • 16-QFN (4x4)

LT4321HUF#TRPBF Documents

  • LT4321 Technical Documentation/Data sheet

LT4321HUF#TRPBF Related Products

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Estimated Delivery Time: Dec 14 - Dec 19 days (choose Expedited at checkout).

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1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that LT4321HUF#TRPBF is the original manufacturer or agent of AD?
We have a professional business development department to strictly test and verify the qualifications of AD original manufacturers and agents. All AD suppliers must pass the qualification review before they can publish their LT4321HUF#TRPBF devices; we pay more attention to the channels and quality of LT4321HUF#TRPBF products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of LT4321HUF#TRPBF chips? Including AD original factory information, OR Controllers, Ideal Diodes application, LT4321HUF#TRPBF pictures?
You can use Jotrin's intelligent search engine, or filter by Power Monitor, Control, & Protection ; PowerPath, Ideal Diodes & Load Switches category, or find it through Analog Devices, Inc Information page.
Q: Are the AD's LT4321HUF#TRPBF price and stock displayed on the platform accurate?
The AD's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for LT4321HUF#TRPBF, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Q: What is the process for returns or replacement of LT4321HUF#TRPBF?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the LT4321HUF#TRPBF we delivered, we will accept the replacement or return of the LT4321HUF#TRPBF only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of LT4321HUF#TRPBF.
(3)The LT4321HUF#TRPBF is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
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Analog Devices, Inc

Analog Devices, Inc. was founded by two MIT graduates, Ray Stata and Matthew Lorber in 1965. The same year, the company released its first product, the model 101 op amp, which was a hockey-puck sized module used in test and measurement equipment. In 1967, the company published the first issue of its...
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