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25G SFP28 1310 nm 10 km

Ascent’s SFP28 transceivers are designed for use in 25G Gigabit Ethernet links with distances up to 10 km over single-mode fiber. These transceivers include a PIN photo detector diode and FP transmitter. Digital diagnostic functions are available via a 2-wire interface.

    Up to 10 km transmission distance

    FP transmitter and PIN photo-detector

    Duplex LC connector 

    Metal enclosure, for lower EMI 

    Electrical interface compliant to SFF-8431 specifications

    2-wire interface for management specifications compliant with SFF-8472

    Compliant with SFP+ MSA

    Single 3.3V power supply 

    Power dissipation < 1.2W

    Case operating temperature range:   Commercial: 0 °C to +70 °C

    Industrial: -40 °C to +85 °C


Absolute Maximum Ratings      

Parameter   

Symbol 

Min.

Typ.

Max. 

Unit 

Note

Storage Temperature

Ts

‑40

85

 °C


Relative Humidity

RH

5

95

 %


Power Supply Voltage

VCC

‑0.3

4

V


Recommended Operating Conditions

Parameter   

Symbol 

Min.

Typ.

Max. 

Unit 

Note

Case Operating Temperature

Tcase

0

70

 °C

Commercial



‑40

85

 °C

Industrial

Power Supply Voltage

VCC

3.14

3.3

3.47

V


Power Supply Current

ICC

300

mA

Commercial



360

mA

Industrial

Data Rate

BR

24.3

25.78

26.5

Gbps


Transmission Distance

TD

10

km


Coupled Fiber

Single‑mode fiber

9/125 µm SMF

Electrical Characteristics  

Parameter   

Symbol  

Min.

Typ.

Max.

Unit 

Note

Supply Voltage   

Vcc

3.14

3.3

3.46

V  


Supply Current   

Icc



300 

mA 

Commercial  





360

mA

Industrial

Transmitter   







Input Differential Impedance  

Rin   


100  


Ω  

1  

Differential Data Input Swing  

Vin,pp

180  


800

mV 


Transmit Disable Voltage  

VDIS

Vcc‑1.3 


Vcc  


Transmit Enable Voltage   

VEN   

Vee  


Vee+ 0.8  

V  

2  

Receiver   







Differential Data Output Swing 

Vout,pp

300 


850   

mV 

3  

LOS Fault   

VLOS fault 

Vcc‑1.3


VCCHOST 

V  

4

LOS Normal   

VLOS norm 

Vee  


Vee+0.8  

V  

4

Notes:

1.      Connected directly to TX data input pins. AC coupled thereafter.   

2.      Or open circuit.   

3.      Into 100 Ω differential termination.   

4.      Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.   

 

Optical Characteristics 

Parameter   

Symbol 

Min.

Typ.

Max.

Unit 

Note

Transmitter   







Average Output Power 

POUT 

‑5


2

dBm  

1  

Optical Wavelength   

λ  

1295


1325

nm  


Spectral Width (RMS)

σ  



1

nm  


Optical Extinction Ratio 

ER  

3.5



dB  


Receiver   







Rx Sensitivity 

RSEN



‑13.3

dBm  

2  

Input Saturation Power (Overload)

PSAT 

0.5



dBm  


Input Optical Wavelength   

λC  

1295


1325

nm  


LOS De ‑Assert   

LOSD 



‑14

dBm  


LOS Assert   

LOSA 

‑30



dBm 


LOS Hysteresis   


0.5



dB  


Notes:   

1.      Class 1 Laser Safety per FDA/CDRH and IEC‑825‑1 regulations.   

2.      Measured with a PRBS 231‑1 test pattern @ 25.78 Gb/s, BER @ 5*10‑5.


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