25G SFP28 DAC

 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 of 25G SFP28 DAC

Up to 25.78125Gbps data rate

 

Up to 5m transmission

 

Hot-pluggable SFP 20PIN footprint

 

Compatible to SFP28 MSA

 

Compatible to SFF-8402 and SFF-8432

 

Single 3.3V power supply

 

Temperature Range: 0~ 70 °C

 

RoHS Compliant

 

Applications of 25G SFP28 DAC

Low EMI radiation Switches, servers and routers

 

Data Center networks

 

Storage area networks

 

High performance computing

 

Telecommunication and wireless infrastructure

 

Medical diagnostics and networking

 

Test and measurement equipment

 

 

 

 

 

Specifications of SFP28 25G Direct Attach Cable

 

Mechanical SpecificationsOrdering Information

Parameter

Minimum

Typical

Maximum

Unit

Cable Diameter (26AWG)

-

0.220

-

Inches

Bend Radius (26AWG)

1.102

-

-

Inches

Cable Diameter (28AWG)

-

0.185

-

Inches

Bend Radius (28AWG)

0.925

-

-

Inches

Cable Diameter (30 AWG)

-

0.181

-

Inches

Bend Radius (30 AWG)

0.906

-

-

Inches

Within Pair Skew

-

-

100

ps/10m

Cable Insertion Loss

-

15.43

-

dB/5m

Bulk Cable Time Delay

-

 

5.2

ns/m

Bulk Cable Impedance

95

100

105

Ohms

Insertion Force

-

-

40

N

Withdrawal Force

-

-

30

N

Retention Force

90

-

-

N

Durability

50 Cycles

-

-

-

 

Recommended Operation Condition of 25G SFP28 Direct Attach Cable

Parameter

Symbol

Min

Max

Unit

Operating Case Temperature

Topc

0

70

degC

Storage Temperature

Tst

-40

85

degC

Relative Humidity (non-condensation)

RS

35

60

%

Supply Voltage

VCC3

3.135

3.465

V

Voltage on LVTTL Input

Vilvttl

-0.3

VCC3  +0.2

V

Power Supply Current

ICC3

-

15

mA

Total Power Consumption

Pd

-

0.05

W

 

Notes:

 

Stress or conditions exceed the above range may cause permanent damage to the device.

 

This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

 

Frequency Domain of 25G SFP28 Direct Attach Cable

Item

Test Parameter

IEEE802.3bj Specification

1

Differential Insertion Loss (SDD12)

Maximum insertion loss at 12.8906Ghz @22.48dB

Minimum insertion loss at 12.8906Ghz@8dB

2

Differential Insertion Loss (SDD21)

Maximum insertion loss at 12.8906Ghz@22.48dB

Minimum insertion loss at 12.8906Ghz@8dB

3

Differential Return Loss (SDD22)

-16.5+2xSQRT(f) @ 0.01 to 4.1GHz

-10.66+14xLog10(f/5.5) @4.1 to 19GHz

4

Differential Return Loss (SDD11)

-16.5+2xSQRT(f) @ 0.01 to 4.1GHz

-10.66+14xLog10(f/5.5) @4.1 to 19GHz

5

Common Mode Reflection (SCC22)

-2dB @ 0.01 to 19GHz

6

Common Mode Reflection (SCC11)

-2dB @ 0.01 to 19GHz

7

Common Mode Conversion (SCD22)

-22+(20/25.78)*(f) @ 0.01 to 12.89GHz

-15+(6/25.78)*(f) @ 12.9 to 19GHz

8

Common Mode Conversion (SCD11)

-22+(20/25.78)*(f) @ 0.01 to 12.89GHz

-15+(6/25.78)*(f) @ 12.9 to 19GHz

9

Differential to Common Mode Conversion Loss (SCD12)

-10dB @ 0.01 to 12.89GHz

-27+(29/22)*(f) @ 12.9 to 15.7GHz

-6.3dB @ 15.71 to 19GHz

10

Differential to Common Mode Conversion Loss (SCD21)

-10dB @ 0.01 to 12.89GHz

-27+(29/22)*(f) @ 12.9 to 15.7GHz

-6.3dB @ 15.71 to 19GHz

 

 

Pin definition of 25G SFP28 Direct Attach Cable

Pin

Symbol

Name/Description

1

VEET [1]

Transmitter Ground

2

Tx_FAULT [2]

Not used

3

Tx_DIS   [3]

Not used

4

SDA [2]

2-wire Serial Interface Data Line

5

SCL [2]

2-wire Serial Interface Clock Line

6

MOD_ABS [4]

Module Absent. Grounded within the module

7

RS0 [5]

Not used

8

RX_LOS [2]

Loss of Signal indication. Logic 0 indicates normal operation

9

RS1 [5]

Not used

10

VEER [1]

Receiver Ground

11

VEER [1]

Receiver Ground

12

RD-

Receiver Inverted DATA out. AC Coupled

13

RD+

Receiver DATA out. AC Coupled

14

VEER [1]

Receiver Ground

15

VCCR

Receiver Power Supply

16

VCCT

Transmitter Power Supply

17

VEET [1]

Transmitter Ground

18

TD+

Transmitter DATA in. AC Coupled

19

TD-

Transmitter Inverted DATA in. AC Coupled

20

VEET [1]

Transmitter Ground

Notes:

1.Module circuit ground is isolated from module chassis ground within the module.

2..should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V.

3.Tx_Disable is an input contact with a 4.7 kΩ to 10 kΩ pullup to VccT inside the module.

4.Mod_ABS is connected to VeeT or VeeR in the SFP+ module. The host may pull this contact up to Vcc_Host with a resistor in the range 4.7 kΩ to10 kΩ.Mod_ABS is asserted “High” when the SFP+ module is physically absent from a host slot.

5. RS0 and RS1 are module inputs and are pulled low to VeeT with > 30 kΩ resistors in the module.

 

As a supplier of fiber optic products, T&S today takes a leading role in OEM and ODM services for optical communication products and fiber optic connectivity solutions. Based on T&S’ excellent and comprehensive capabilities, we are committed to providing optical communication products with superior performance for next-generation communications in a green, pragmatic, and cost-effective manner.

 


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