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 (EU)2015/863   compliant

REACH Compliance

REACH  Regulation   (EC) No 1907/2006

REACH (EC) No   1907/2006 compliant