25G SFP28 Direct Attach Cable (DAC) Datasheet

    Brand Name:KOLORAPUS

    Sample: Available

    Unit price<=$15 ,free sample and need to pay the freight.

    Unit price >$15,need to pay the double sample fee and freight.

    MOQ: >=$7000

    Origin: China

    Certification:ISO/3C/CE/ROHS/UL

    Package: Carton

    Payment Method:T/T


Product Description

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).

 

Features

  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

 

Benefits

  Cost-effective copper solution

  Lowest total system power solution

  Lowest total system EMI solution

  Optimized design for Signal Integrity

Applications

  25G Ethernet

 

 Product Description

  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.


High Speed Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Note

Differential   Impedance

TDR

90

100

110

Ώ


Insertion   loss

SDD21

-22.48



dB

At   12.8906 GHz

Differential   Return Loss

SDD11

SDD22



See   1

dB

At   0.05 to 4.1 GHz



See 2

dB

At   4.1 to 19 GHz

Common-mode   to common-mode output return loss

SCC11

SCC22



-2

dB

At   0.2 to 19 GHz

Differential   to common-mode

return   loss

SCD11

SCD22



See 3

dB

At   0.01 to 12.89 GHz



See 4

At   12.89 to 19 GHz

Differential   to common Mode

Conversion   Loss

SCD21-IL



-10

dB

At   0.01 to 12.89 GHz



See   5

At   12.89 to 15.7 GHz



-6.3

At   15.7 to 19 GHz

Notes:

1.     Reflection Coefficient given by   equation SDD11(dB) < -16.5 + 2 × SQRT(f ), with f   in GHz

2.     Reflection Coefficient given by   equation SDD11(dB) < -10.66 + 14 × log10(f/5.5),   with f in GHz

3.     Reflection Coefficient given by   equation SCD11(dB) < -22 + (20/25.78)*f, with f in GHz

4.     Reflection Coefficient given by   equation SCD11(dB) < -15 + (6/25.78)*f, with f in GHz

5.     Reflection Coefficient given by   equation SCD21(dB) < -27 + (29/22)*f, with f in GHz

 

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


 25G SFP28 Direct Attach Cable (DAC) Datasheet(图1)


Mechanical Specifications

The connector is compatible with the SFF-8432 specification.

25G SFP28 Direct Attach Cable (DAC) Datasheet(图2)

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 EU   2015/863

RoHS EU2015/863   compliant

REACH Compliance

REACH  Regulation   (EC) No 1907/2006

REACH (EC) No   1907/2006 compliant