PRODDUCTS

Shenzhen JHA Technology Co., Ltd is one of the leading manufacturers of hardened Ethernet, PoE, and fiber connectivity products specifically designed for harsh and demanding environments.

PRODUCTS

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25G SFP28 Direct Attach Cable (DAC) JHA-SFP28-25G-PCU


    • Up to 25.78125 Gbps data rate
    • Up to 5 meter transmission
    • Hot-pluggable SFP 20PIN footprint
    • Improved Pluggable Form Factor(IPF) compliant for enhanced EMI/EMC performance
    • Compatible to SFP28 MSA
    • Compatible to SFF-8402 and SFF-8432
    • Temperature Range: 0~ 70 °C
    • RoHS Compatible
  • Applications

    ◊ 25G Ethernet

Classification

Network Cabling

DAC(Direct Attach Cable)


  • DESCRIPTION
  • DIMENSION
  • ORDER INFORMATION
  • DOWNLOAD
  • APPLICATIONS
  • General Description

    SFP28 Direct Attach Cables are compliant with SFF-8432 and SFF-8402 specifications. Various choices of wire gauge are available from 30 to 26 AWG with various choices of cable length (up to 5m).

    The SFP28 passive cable assemblies are high performance, cost effective I/O solutions for 25G Ethernet. SFP28 copper cables allow hardware manufactures to achieve high port density, configurability and utilization at a very low cost and reduced power budget.

     

    Benefits

    ◊ Cost-effective copper solution

    ◊ Lowest total system power solution

    ◊ Lowest total system EMI solution

    ◊ Optimized design for Signal Integrity

     

    High Speed Characteristics

    Parameter

    Symbol

    Min

    Typical

    Max

    Unit

    Note

    Differential Impedance

    RIN,P-P

    90

    100

    110

    Ώ

     

    Insertion loss

    SDD21

    8

     

    22.48

    dB

    At 12.8906 GHz

    Differential Return Loss

    SDD11

     

    12.45

      See 1

    dB

    At 0.05 to 4.1 GHz

    SDD22

    3.12

      See 2

    dB

    At 4.1 to 19 GHz

       

    Common-mode to

    SCC11

         

    dB

     

    common-mode

    2

       

    At 0.2 to 19 GHz

    SCC22

       

    output return loss

               
                   

    Differential to common-mode

    SCD11

     

    12

      See 3

    dB

     

    At 0.01 to 12.89 GHz

             

    return loss

    SCD22

    10.58

      See 4  

    At 12.89 to 19 GHz

         
                     
         

    10

           

    At 0.01 to 12.89 GHz

    Differential to common Mode

    SCD21-IL

          See 5

    dB

     

    At 12.89 to 15.7 GHz

    Conversion Loss

       
         

    6.3

           

    At 15.7 to 19 GHz

    Channel Operating Margin

    COM

    3

       

    dB

     

    Pin Descriptions

    SFP28 Pin Function Definition

    Pin

    Logic

    Symbol

    Name/Description

    Notes

    1

     

    VeeT

    Transmitter Ground

     

    2

    LV-TTL-O

    TX_Fault

    N/A

    1

    3

    LV-TTL-I

    TX_DIS

    Transmitter Disable

    2

    4

    LV-TTL-I/O

    SDA

    Tow Wire Serial Data

     

    5

    LV-TTL-I

    SCL

    Tow Wire Serial Clock

     

    6

     

    MOD_DEF0

    Module present, connect to VeeT

     

    7

    LV-TTL-I

    RS0

    N/A

    1

    8

    LV-TTL-O

    LOS

    LOS of Signal

    2

    9

    LV-TTL-I

    RS1

    N/A

    1

    10

     

    VeeR

    Reciever Ground

     

    11

     

    VeeR

    Reciever Ground

     

    12

    CML-O

    RD-

    Reciever Data Inverted

     

    13

    CML-O

    RD+

    Reciever Data Non-Inverted

     

    14

     

    VeeR

    Reciever Ground

     

    15

     

    VccR

    Reciever Supply 3.3V

     

    16

     

    VccT

    Transmitter Supply 3.3V

     

    17

     

    VeeT

    Transmitter Ground

     
     

    18

    CML-I

    TD+

     

    Transmitter Data Non-Inverted

     
     

    19

    CML_I

    TD-

     

    Transmitter Data Inverted

     
     

    20

     

    VeeT

     

    Transmitter Ground

     

    1.

    Signals not supported in SFP+ Copper pulled-downto VeeT with 30K ohms resistor  

    2.

    Passive cable assemblies do not support LOS and TX_DIS  

    32

    Mechanical Specifications

    The connector is compatible with the SFF-8432 specification.

     54

    Length (m) Cable AWG

    1

    30

    2

    30

    3

    30/26

    4

    26

    5

    26

    Regulatory Compliance

    Feature

    Test Method Performance
    Electrostatic Discharge (ESD) to the Electrical Pins  MIL-STD-883C Method 3015.7  Class 1(>2000 Volts)
    Electromagnetic Interference(EMI) FCC Class B Compliant with Standards
    CENELEC EN55022 Class B
    CISPR22 ITE Class B
     RF Immunity(RFI)  IEC61000-4-3 Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz
    RoHS Compliance RoHS Directive 2011/65/EU and it’s Amendment Directives 6/6 RoHS 6/6 compliant
     
  • Applications

    ◊ 25G Ethernet

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