SFP28-25G-SR 25G SFP28 SR 850nm 100m LC MMF DDM Transceiver Module
Duplex SFP28 Transceiver
LC connector receptacle
Data Rate up to 25.78125 Gb/s
850nm VCSEL laser and PIN photo-detector
Maximum link length of 70m on OM3 MMF and 100m on OM4 MMF
◆ 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.
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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