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JHA-SFP28-25G-PCU Spec
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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).

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? w Up to 25.78125 Gbps data rate

? w Up to 5 meter transmission

? w Hot-pluggable SFP 20PIN footprint

? w Improved Pluggable Form Factor(IPF)

compliant for enhanced EMI/EMC

performance

? w Compatible to SFP28 MSA

? w Compatible to SFF-8402 and SFF-8432

? w Temperature Range: 0~ 70 ¡ãC

w 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

RIN,P-P

90

100

110

?

 

 

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

 

Notes:

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

2. Reflection Coefficient given by equation SDD11(dB) < 10.66 - 14 ¡Á 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

 

Mechanical Specifications

 

The connector is compatible with the SFF-8432 specification.

 

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

 

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