Product Features
●Supports bit rates up to 25.78Gbps
●Features a hot-pluggable SFP+ footprint
●Equipped with a 1310nm DFB laser and PIN photodiode, enabling up to 10km transmission over SMF
●Compliant with SFP+ MSA and SFF-8472 specifications, featuring a duplex LC receptacle
●RoHS compliant
●Operates with a single +3.3V power supply
●Includes Real-Time Digital Diagnostic Monitoring
●Operating case temperature range: Standard 0°C to +70°C
Applications
● 25GBASE-LR
Product Details
The SFP28 transceivers are high-performance, cost-effective modules capable of supporting a data rate of 25.78Gbps and facilitating a transmission distance of 10km over Single-Mode Fiber (SMF).
These transceivers comprise three key components: a DFB laser transmitter, a PIN photodiode that is integrated with a trans-impedance preamplifier (TIA), and an MCU control unit. All modules adhere to Class I laser safety standards.
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Absolute Maximum Ratings
|
Parameter |
Symbol |
Min |
Max |
Unit |
|
Supply Voltage |
Vcc |
-0.5 |
4 |
V |
|
Storage Temperature |
Ts |
-40 |
+85 |
°C |
|
Operating Humidity |
- |
5 |
85 |
% |
Recommended Operating Conditions
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
|
Operating Case Temperature |
Tc |
0 |
+70 |
°C |
|
|
Power Supply Voltage |
Vcc |
3.135 |
3.30 |
3.465 |
V |
|
Power Supply Current |
Icc |
400 |
mA |
||
|
Data Rate |
25.78 |
Gbps |
Optical and Electrical Characteristics
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Notes |
||
|
Transmitter |
||||||||
|
Centre Wavelength |
λc |
1270 |
1310 |
1350 |
nm |
|||
|
Spectral Width(-20dB) |
Δλ |
1 |
nm |
|||||
|
Side-Mode Suppression Ratio |
SMSR |
30 |
- |
dB |
||||
|
Average Output Power |
Pout |
-6 |
2 |
dBm |
1 |
|||
|
Extinction Ratio |
ER |
3.5 |
dB |
|||||
|
Data Input Swing Differential |
VIN |
180 |
850 |
mV |
2 |
|||
|
Input Differential Impedance |
ZIN |
90 |
100 |
110 |
Ω |
|||
|
TX Disable |
Disable |
2.0 |
Vcc |
V |
||||
|
Enable |
0 |
0.8 |
V |
|||||
|
TX Fault |
Fault |
2.0 |
Vcc |
V |
||||
|
Normal |
0 |
0.8 |
V |
|||||
|
Receiver |
||||||||
|
Centre Wavelength |
λc |
1260 |
1600 |
nm |
||||
|
Receiver Sensitivity |
-13.3 |
dBm |
3,4 |
|||||
|
Receiver Overload |
2 |
dBm |
3,4 |
|||||
|
LOS De-Assert |
LOSD |
-15 |
dBm |
|||||
|
LOS Assert |
LOSA |
-30 |
dBm |
|||||
|
LOS Hysteresis |
0.5 |
dB |
||||||
|
Data Output Swing Differential |
Vout |
300 |
900 |
mV |
5 |
|||
|
LOS |
High |
2.0 |
Vcc |
V |
||||
|
Low |
0.8 |
V |
||||||
Notes:
1. The optical power is launched into SMF.
2. PECL input, internally AC-coupled and terminated.
3. Measured with a PRBS 231-1 test pattern @25.78Gps, BER ≤5×10-5.
4. Measured with a PRBS 231-1 test pattern @10.3125Gps, BER ≤1×10-12.
Bits 110.3 and bits 118.3 control the locking modes of the internal retimer or CDR, default Value is "1".
5. Internally AC-coupled.
|
Bit 110.3 of A2h |
Bit 118.3 of A2h |
RX Data Rate |
TX Data Rate |
Status of RX CDR |
Status of TX CDR |
|
High/1 |
High/1 |
24.33G/25.78G |
24.33G/25.78G |
CDR select |
CDR select |
|
High/1 |
Low/0 |
24.33G/25.78G |
9.95G/10.31G |
CDR select |
CDR bypass |
|
Low/0 |
High/1 |
9.95G/10.31G |
24.33G/25.78G |
CDR bypass |
CDR select |
|
Low/0 |
Low/0 |
9.95G/10.31G |
9.95G/10.31G |
CDR bypass |
CDR bypass |
Ordering Information
|
Part Number |
Description |
|
SFP28-25G-LR |
25Gbps SFP28 Transceiver, Single Mode, 10km Reach |
FAQ
1. Can you put SFP+ in a SFP28 port?
A: Yes, but when connected to the SFP + transceiver, this port can only support up to 10Gbps of Internet speeds.
2. What is QSFP28 and SFP28?
A: Both have different sizes and protocol standards. The SFP28 module is defined as supporting a single vehicle transmission rate of 25GB, and the QSFP28 supports four 25Gbit/s channels with a total data rate of 100G
3. What speed is SFP28 supported by?
A: The SFP 28 optical module has a transmission rate of 25Gbps, using a LC connector.
