Products > Integrated Circuits (ICs) > Power Management ICs > SI3402-A-GMR

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Manufacturer : SI
Package/Case : QFN-20
Product Categories : Hot Swap & Power Distribution
Datasheet: SI3402-A-GMR Datasheet (PDF)
RoHs Status: Lead free / RoHS Compliant
Marking Code: SI3402
In-stock: 10000


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SI3402-A-GMR Product Details

The Si3402 integrates all power management and control functions required in a Power-over-Ethernet (PoE) powered device (PD) application. The Si3402 converts the high voltage supplied over the 10/100/1000BASE-T Ethernet connection into a regulated, low-voltage output supply. The optimized architecture of the Si3402 minimizes the solution footprint, reduces external BOM cost, and enables the use of low-cost external components while maintaining high performance. The Si3402 integrates the required diode bridges and transient surge suppressor, thus enabling direct connection of the IC to the Ethernet RJ-45 connector. The switching power FET and all associated functions are also integrated. The integrated switching regulator supports isolated (flyback) and non-isolated (buck) converter topologies. The Si3402 supports IEEE Std 802.3™ 2008 including the IEEE Std 802.3at-2009 amendment for the case of single-event classification. Standard external resistors connected to the Si3402 provide the proper 802.3 signatures for the detection function and programming of the classification mode. Startup circuits ensure well-controlled initial operation of both the hotswap switch and the voltage regulator. The Si3402 is available in a low-profile, 20-pin, 5 x 5 mm QFN package. While the Si3402 is designed for applications up to 10 W, it can be used for higher power applications (up to approximately 15 W). See also “AN313: Using the Si3402 in High Power Applications” for more information. 


  • IEEE 802.3 standard-compliant solution, including pre-standard (legacy) PoE support 
  • Highly-integrated IC enables compact solution footprints
    Minimal external components 
    Integrated diode bridges and transient surge suppressor 
    Integrated switching regulator controller with on-chip power FET
    Integrated dual current-limited hotswap switch 
  • Programmable classification circuit
  • Incorporates switcher EMIreduction techniques
  • Supports non-isolated and isolated switching topologies
  • Comprehensive protection circuitry
    Transient overvoltage protection
    Undervoltage lockout
    Early power-loss indicator 
    Thermal shutdown protection
    Foldback current limiting
  • Low-profile 5 x 5 mm 20-pin QFN


  • Voice over IP telephones and adapters 
  • Wireless access points 
  • Security cameras 
  • Point-of-sale terminals 
  • Internet appliances 
  • Network devices 
  • High power applications


SI3402-A-GMR Pinout
(Picture: Pinout)

SI3402-A-GMR Block Diagram
(Picture: Diagram)

Technical Parameters

  • Product
  • PoE / LAN Solutions
  • Current Limit
  • 680 mA
  • Supply Voltage Max
  • 57 V
  • Supply Voltage Min
  • 2.8 V
  • Operating Temperature Range
  • - 40 C to + 85 C
  • Power Dissipation
  • 1.2 W
  • Mounting Style
  • Package / Case
  • QFN-20
  • Packaging
  • Reel
  • Input / Supply Voltage (Max)
  • 57 V
  • Input / Supply Voltage (Min)
  • 2.8 V
  • Factory Pack Quantity
  • 2500
  • Supply Current
  • 2 mA

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Estimated Delivery Time: Mar 05 - Mar 10 days (choose Expedited at checkout).

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We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

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1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

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 SI3402-A-GMR is the original manufacturer or agent of SI?
We have a professional business development department to strictly test and verify the qualifications of SI original manufacturers and agents. All SI suppliers must pass the qualification review before they can publish their SI3402-A-GMR devices; we pay more attention to the channels and quality of SI3402-A-GMR products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of SI3402-A-GMR chips? Including SI original factory information, Hot Swap & Power Distribution application, SI3402-A-GMR pictures?
You can use Jotrin's intelligent search engine, or filter by Hot Swap & Power Distribution category, or find it through SI brand manufacturer page.
Q: Are the SI's SI3402-A-GMR price and stock displayed on the platform accurate?
The SI's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for SI3402-A-GMR, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of SI3402-A-GMR?
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 SI3402AGMR we delivered, we will accept the replacement or return of the SI3402-A-GMR 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 SI3402-A-GMR.
(3)The SI3402-A-GMR is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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