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What is 25G SFP28 DAC for Data Centers?
25G SFP28 DAC is a passive direct attach copper cable designed for 25G Ethernet high-speed interconnects.
It is used for short-distance connections in data centers, high-performance computing clusters, and enterprise networks.
It provides low latency, low power consumption, and cost-efficient connectivity.
It is also compatible with SFP+ Direct Attach Cable solutions, making it ideal for upgrading from 10G to 25G networks.
At Spring Optical, we offer 25G SFP28 DAC cables with strict quality control, stable performance, and fast global delivery.
Key Advantages of 25G SFP28 DAC
25G SFP28 DAC supports up to 25Gbps high-speed transmission
Cost-effective alternative to optical transceivers
Low power consumption with passive copper design
Hot-pluggable for easy installation
Available in DAC SFP28 25G 3m, 2m, and custom lengths
Features of 25G SFP28 DAC Cable
High-speed copper twinax structure design
EEPROM integrated for device identification
Fully compliant with IEEE 802.3by and SFP28 MSA
Excellent EMI shielding performance
Backward compatible with SFP+ DAC cable and DAC cable SFP+ configurations
100% factory tested for performance and reliability
Applications of 25G SFP28 DAC
25G Ethernet data centers
High Performance Computing (HPC) clusters
InfiniBand and Fiber Channel 25G systems
High-end servers and storage systems
Metro network switches and cross-connect
Migration from SFP+ DAC cable to 25G SFP28 DAC infrastructure
25G SFP28 DAC vs SFP+ DAC Cable
| Feature | 25G SFP28 DAC | SFP+ DAC Cable |
|---|---|---|
| Data Rate | 25G | 10G |
| Density | Higher | Standard |
| Power Consumption | Lower | Higher |
| Application | 25G Data Centers | 10G Networks |
Customization & OEM Service
We offer:
Custom cable lengths (0.5m – 5m)
Connector compatibility customization
Labeling and branding services
Packaging customization
OEM / ODM manufacturing
We support telecom operators, distributors, and system integrators worldwide.
Why Choose Spring Optical
In-house manufacturing capability
Strict quality control system
Fast delivery and global shipping
Extensive experience in data center and telecom projects
Serving customers in over 100 countries
Related Products
SFP+ Direct Attach Cable
SFP+ DAC Cable
100G QSFP28 DAC
SFP28 Optical Transceiver
FAQ
Q: What is 25G SFP28 DAC?
A: 25G SFP28 DAC is a passive copper cable used for short-distance 25G high-speed interconnects.
Q: Where is 25G SFP28 DAC used?
A: It is used in data centers, HPC clusters, and enterprise networks.
Q: What cable lengths are available?
A: Standard lengths include 1m, 2m, and DAC SFP28 25G 3m.
Q: What is the difference between SFP28 and SFP+ DAC cable?
A: SFP28 supports 25G, while SFP+ DAC cable supports 10G transmission.
Q: Is 25G SFP28 DAC compatible with SFP+ Direct Attach Cable?
A: Yes, it supports backward compatibility in certain network environments.
Q: What is DAC SFP28 25G 3m used for?
A: It is used for short-distance connections between switches and servers.
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Performance Specifications
Absolute Maximum Ratings
These values represent the damage threshold of the module. Stress in excess of any of the individual Absolute Maximum Ratings can cause immediate catastrophic damage to the module even if all other parameters are within Recommended Operating Conditions.
Table.1 Absolute maximum ratings
|
Parameter |
Symbol |
Min |
Max |
Unit |
|
Maximum Supply Voltage |
Vcc |
0 |
3.6 |
V |
|
Storage Temperature |
Ts |
-40 |
85 |
°C |
|
Relative Humidity |
RH |
5 |
95 |
% |
Table.2 Recommended Operating Conditions
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
|
Operating Case Temperature |
Standard Tc |
0 |
25 |
70 |
°C |
|
Storage Temperature |
Ts |
-40 |
125 |
°C |
|
|
Power Supply Voltage |
Vcc |
3.13 |
3.30 |
3.47 |
V |
|
Power Supply Current |
Icc |
0.001 |
mA |
||
|
Power Dissipation |
PD |
0.003 |
W |
||
|
Relative Humidity |
RH |
5 |
95 |
% |
|
|
Voltage on LVTTL Input |
Vilvttl |
-0.3 |
VCC3+0.2 |
V |
|
|
Data Rate |
25 |
Gbps |
Table.3 Frequency Domain
|
Item |
Test Parameter |
IEEE802.3by Specification |
|
1 |
Differential Insertion Loss (SDD21) |
Maximum insertion loss at 12.8906Ghz -22.48dB |
|
2 |
Differential Insertion Loss (SDD21) |
Maximum insertion loss at 12.8906Ghz -22.48dB |
|
3 |
Differential Return Loss (SDD22) |
-16.5+2xSQRT(f) @ 0.01 to 4.1GHz |
|
4 |
Differential Return Loss (SDD11) |
-16.5+2xSQRT(f) @ 0.01 to 4.1GHz |
|
5 |
Common Mode Reflection (SCC22) |
-2dB @ 0.01 to 19GHz |
|
6 |
Common Mode Reflection (SCC11) |
-2dB @ 0.01 to 19GHz |
|
7 |
Common Mode Conversion (SCD22) |
-22+(20/25.78)*(f) @ 0.01 to 12.89GHz |
|
8 |
Common Mode Conversion (SCD11) |
-22+(20/25.78)*(f) @ 0.01 to 12.89GHz |
|
9 |
Differential to Common Mode Conversion Loss (SCD12) |
-10dB @ 0.01 to 12.89GHz |
|
10 |
Differential to Common Mode Conversion Loss (SCD21) |
-10dB @ 0.01 to 12.89GHz |
Table.4 Time Domain
|
Item |
Test Parameter |
Specification (Proposal ) |
|
1 |
Intra-Skew* |
|
|
1M |
20ps Max |
|
|
1.5M~2M |
25ps Max |
|
|
2.5M~3M |
30ps Max |
|
|
2 |
Differential Impedance |
100 +/- 10 Ohm |
|
3 |
Insertion Loss* (SDD21) for 1M |
a) 0.6GHz : -2.11 dB Max |
|
b) 1.25GHz : -2.88 dB Max |
||
|
c) 2.50GHz : -3.78 dB Max |
||
|
d) 3.25GHz : -4.95 dB Max |
||
|
e) 5.0GHz : -5.82 dB Max |
||
|
3 |
Insertion Loss* (SDD21) for 1.5M |
a) 0.6GHz : -2.13 dB Max |
|
b) 1.25GHz : -3.24 dB Max |
||
|
c) 2.50GHz : -4.44 dB Max |
||
|
d) 3.25GHz : -5.99 dB Max |
||
|
e) 5.0GHz : -6.90 dB Max |
||
|
3 |
Insertion Loss* (SDD21) for 2M |
a) 0.6GHz : -2.32 dB Max |
|
b) 1.25GHz : -3.76 dB Max |
||
|
c) 2.50GHz : -5.26 dB Max |
||
|
d) 3.25GHz : -7.20 dB Max |
||
|
e) 5.0GHz : -8.14 dB Max |
||
|
3 |
Insertion Loss* (SDD21) for 2.5M |
a) 0.6GHz : -2.58 dB Max |
|
b) 1.25GHz : -3.74 dB Max |
||
|
c) 2.50GHz : -5.27 dB Max |
||
|
d) 3.25GHz : -6.15 dB Max |
||
|
e) 5.0GHz : -8.38 dB Max |
||
|
3 |
Insertion Loss* (SDD21) for 3M |
a) 0.6GHz : -2.86 dB Max |
|
b) 1.25GHz : -4.24 dB Max |
||
|
c) 2.50GHz : -6.02 dB Max |
||
|
d) 3.25GHz : -6.99 dB Max |
||
|
e) 5.0GHz : -9.50 dB Max |
Notes:
The item 1and 3, Different diameter and length requirements, Different specification
Table.5 Pin Definitions
|
PIN |
Symbol |
Description |
Remarks |
|
1 |
VEET |
Transmitter ground (common with receiver ground) |
Circuit ground is isolated from chassis ground |
|
2 |
Tx_Fault |
Transmitter Fault. Not supported |
|
|
3 |
Tx_Disable |
Transmitter Disable. Laser output disable on high or open |
Disabled: TDIS>2V or open Enabled: TDIS<0.8V |
|
4 |
SDA |
2-wire Serial Interface Data Line |
Should Be pulled up with 4.7k – 10k ohm on host board to a voltage between 2V and 3.6V |
|
5 |
SCL |
2-wire Serial Interface Clock Line |
|
|
6 |
MOD_ABS |
Module Absent. Grounded within the module. |
|
|
7 |
RS0 |
No connection required |
|
|
8 |
RX_LOS |
Loss of Signal indication. Logic 0 indicates normal operation |
LOS is open collector output |
|
9 |
RS1 |
No connection required |
|
|
10 |
VEER |
Receiver ground (common with transmitter ground) |
Circuit ground is isolated from chassis ground |
|
11 |
VEER |
Receiver ground (common with transmitter ground) |
|
|
12 |
RD– |
Receiver Inverted DATA out. AC coupled |
|
|
13 |
RD+ |
Receiver Non-inverted DATA out. AC coupled |
|
|
14 |
VEER |
Receiver ground (common with transmitter ground) |
Circuit ground is isolated from chassis ground |
|
15 |
VCCR |
Receiver power supply |
|
|
16 |
VCCT |
Transmitter power supply |
|
|
17 |
VEET |
Transmitter ground (common with receiver ground) |
Circuit ground is isolated from chassis ground |
|
18 |
TD+ |
Transmitter Non-Inverted DATA in. AC coupled |
|
|
19 |
TD– |
Transmitter Inverted DATA in. AC coupled |
|
|
20 |
VEET |
Transmitter ground (common with receiver ground) |
Circuit ground is isolated from chassis ground |
Wire Interface EEPROM
The EEPROM on the SFP28 passive cable assembly is designed for 256 addresses. The information for addresses 0 to 127 is listed below. This information can be tailored to any customer request. Any address can be altered to display customer specific information and more memory can be added if more addresses are needed. Addresses128 to 255 can be reserved for customer specific information that is in addition to the SFF 8431 specification.
Ordering Information
|
Part Number |
Description |
|
SFP28-DxxM |
25G SFP28 to 25G SFP28 DAC, xx=Length |
