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Shenzhen Whandar Optical Technology Co., Ltd.

Product

HD-SFP28/25G-SR

Operating temperature range Commercial :0℃ to 70℃ Industrial :-40℃ to 85℃

Support hotline:

0755-86654236 /

DownloadProduct Details

Product Description


◆  Hot-pluggable SFP28 form factor

 

◆  Supports 25.78125Gb/s bit rate

 

◆  Maximum link length of 70m on OM3 MMF and 100m on OM4 MMF

 

◆  850nm VCSEL laser and PIN photo detector

 

◆  Internal CDR on both Transmitter and Receiver channel

 

◆  Operating environment temperature range: 0 ~ +70℃

 

◆  Single 3.3V power supply

 

◆  Low power dissipation: <1.0W

 

Features

◆ Duplex LC connector Support up to 28Gb/s bit rates

◆ Hot-pluggable SFP footprint

◆ Built-in digital diagnostic functions

◆ Internal CDR on both Transmitter and Receiver channel

◆ Transmission distance up to 100m on OM4 MMF

◆ Single power supply 3.3V

◆ RoHS6 compliant

◆ Operating temperature range Commercial :0℃ to 70℃ Industrial :-40℃ to 85℃

◆ Power consumption <1.0W

 

Applications

◆ Data Center

◆ 25GBASE-SR Ethernet

◆ 32G Fiber Channel Applications

◆ Servers, Switches, Storage and Host Card Adapters


 

Optical transmitter Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Launched Power (avg.)

POUT

-8.4


2.4

dBm


Optical Power OMA

POMA

-6.4


3

dBm


Operating Wavelength

Range

λC

840

850

860

nm


Spectral Width (RMS)

∆λ



0.6

nm


Extinction Ratio

ER

2



dB


Transmitter and Dispersion

Penalty

TDP



4.3

dB


Optical Output Power after

TX Disable

PDIS



-30

dBm


Relative Intensity Noise

RIN



-128

dB/Hz


Optical Return Loss

Tolerance

ORL



12

dB


Optical Receiver Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Wavelength Range

λC

840

850

860

nm


Average Receiver Power

Pmax

-10.3


2.4

dBm


Receiver Sensitivity

(Average power)

Psen



 

-10.3

dBm

1,2

LOS De-Assert

LOSD



-13

dBm


LOS Assert

LOSA

-30



dBm


LOS Hysteresis


0.5



dB


Receiver Reflectance

Rr



-12

dB


 

Notes:

1. Measured with a PRBS 231-1 test pattern, @25.78125Gb/s, BER<5E-5.

2. Minimum value is informative, equals min Tx OMA with infinite ER and max channel insertion loss.


Pin definition

The SFP28 modules are hot-pluggable. Hot pluggable refers to plugging in or unplugging a module while the host board is powered. The SFP28 host connector is a 0.8 mm pitch 20 position right angle improved connector specified by SFF-8431, or stacked connector with equivalent electrical performance. SFP28 module contacts mates with the host in the order of ground, power, followed by signal as illustrated by Figure 1 and the contact sequence order listed in Table 1.



image.png 

 

Figure 1 SFP28 Pad Assignment Top View


Pin

No

Symbol

Name/Description

Power Seq.

Note

1

VeeT

Transmitter Ground

1st

1

2

TX_Fault

Transmitter Fault

3rd

2

3

TX_Disable

Transmitter Disable

3rd

3

4

SDA

2-Wire Serial Interface Data Line

3rd

4

5

SCL

2-Wire Serial Interface Data Line

3rd

4

6

Mod_ABS

Module Absent, Connect to VeeT or VeeR in Module

3rd

5

7

RS0

No connection required

3rd

6

8

RX_LOS

Receiver Loss of Signal indication

3rd

7

9

RS1

No connection required

3rd

8

10

VeeR

Receiver Ground

1st

1

11

VeeR

Receiver Ground

1st

1

12

RD-

Receiver Inverted DATA out. AC Coupled. CML-O

3rd

9

13

RD+

Receiver Non-inverted DATA out. AC Coupled. CML-O

3rd

9

14

VeeR

Receiver Ground

1st

1

15

VccR

Receiver Power Supply

2nd

10

16

VccT

Transmitter Power Supply

2nd

10

17

VeeT

Transmitter Ground

1st

1

18

TD+

Transmitter Non-Inverted DATA in. AC Coupled. CML-I

3rd

11

19

TD-

Transmitter Inverted DATA in. AC Coupled. CML-I

3rd

11

20

VeeT

Transmitter Ground

1st

1

Power Seq.: Pin engagement sequence during hot plugging.

Notes:

1. The module signal ground contacts.

2. This pin is an open drain/collector and should be pulled up to Vcc-host in the host with a 4.7k~10k Ohm resistor.

3. This pin should be pulled up to VccT with a 4.7k~10k Ohm resistor in modules.

4. SDA&SCL (IIC) are needed pull up 4.7k~10k Ohm resistors on host board.

5. Mod_ABS is connected to VeeT or VeeR in the SFP28 module.

6. Rate Select 0, no connection required.

7. Module RX_Los of signal indication need pull up 4.7k~10k Ohm resistor on host board.

8. Rate Select 1, no connection required.

9. RD -/+: These are the differential receiver outputs. They are CML AC-coupled with 100 Ohm terminal resistor matching internal.

10. VccR and VccT are the receiver and transmitter power supplies.

11. TD-/+: These are the differential transmitter inputs. They are CML AC-coupled with 100 Ohm terminal resistor matching internal


Ordering information

 

PART NO.

Specifications

Pack

Rate

Tx

Po

Sen

Temp

Reach

DDM

(Gbps)

(nm)

(dBm)

(dBm)

(℃)

(m)

 

HD-SFP28/25G-SR

 

SFP28

 

25.78125

 

850

 

-8.4~2.4

 

<-10.3

 

0~70

 

100

 

Y

*Note:

1. Measured with a PRBS 231-1 test pattern, @25.78125Gb/s, BER<5E-5.

2. OM3 Cable length =<70m or OM4 Cable length =<100m.

3. More detail product selection and cable lengths, please contact Handar.

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