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28G SFP28 850 nm 100 m

Ascent’s SFP28-25G-LP-85-01 SFP28 transceiver is an integrated fiber optic transceiver that provides a high-speed serial link at signaling rates up to 28 Gb/s. The module complies with SFF-8431 and SFF 8472standards. It is suitable for 25G Ethernet applications and has a transmission distance of up to 70 m on OM3 and 100 m on OM4 multi-mode fibers.

•    Supports 28 Gb/s bit rates

•    Up to 70 m transmission distance on OM3

•    Up to 100 m transmission distance on OM4

•    VSCEL laser and PIN receiver

•    Metal enclosure, for lower EMI

•    2-wire interface with integrated Digital Diagnostic monitoring

•    Hot-pluggable SFP+ footprint

•    Specifications compliant with SFF 8431 and SFF 8472

•    Compliant with SFP+ MSA with LC connector

•    Single 3.3 V power supply


Absolute Maximum Ratings 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Storage Temperature

Ts

‑40

‑

85

°C


Relative Humidity

RH

5

‑

95

%


Power Supply Voltage

VCC

‑0.3

‑

4

V


Signal Input Voltage


Vcc‑0.3

‑

Vcc+0.3

V


Recommended Operating Conditions

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Case Operating Temperature

Tcase

0

‑

70

°C

Commercial

Power Supply Voltage

VCC

3.14

3.3

3.47

V


Power Supply Current

ICC

‑


300

mA


Data Rate

BR


25.78


Gbps


Transmission Distance

TD


‑

100

m

OM4 or 70 m OM3

Coupled fiber

Multi‑mode fiber


Optical Characteristics 

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Transmitter







Output Optical Power

POUT

‑9.1


2.4

dBm

1

Optical Wavelength

λ

840

850

860

nm


Spectral Width (RMS) 

σ 



0.6

nm


Optical Extinction Ratio

ER

3.0



dB


RIN

RIN



‑128

dB/Hz


Receiver







Rx Sensitivity 

RSENS



‑11

dBm

2

Input Saturation Power (Overload)

PSAT

2.4



dBm


Wavelength Range

λC

770

850

860

nm


LOS De‑Assert

LOSD



‑13

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, @25.78Gb/s, BER<10‑5.

Electrical Characteristics 

Parameter

Symbol

Min

Typ

Max

Unit

Notes

Supply Voltage

VCC

3.14

3.3

3.46

V


Supply Current

ICC



300

mA


Transmitter







Input Differential Impedance

Rin


100


Ω

1

Single Ended Data Input Swing

Vin, pp

180


700

mV


Transmit Disable Voltage

VD

Vcc‑1.3


Vcc

V


Transmit Enable Voltage

VEN

Vee


Vee+0.8

V

2

Receiver







Differential data output swing

Vout, pp

300


850

mV

3

LOS Fault

VLOSfault

Vcc‑1.3


VccHOST

V

4

LOS Normal

VLOSnorm

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. 

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