25G SFP28 LRL Transceiver for 2km SMF Links, 1310nm Duplex LC
SFP28-25-13-2(LRL)-LCD
- Broad Multi-Brand Compatibility
- Flexible Customization Support
- Tested for Reliable Performance
- Fast Response & Delivery
- Professional Technical Support
The FC-LINK SFP28 25G 1310nm 2km LRL LC DX single-mode transceiver is a high-performance SFP28 module designed for duplex optical data communications. It supports data rates of 24.33Gbps and 25.78Gbps with CDR enabled and can also support 10G Ethernet when CDR is bypassed. Featuring an SFP+ 20-pin connector for hot-plug capability, the module offers digital diagnostic functions accessible via an I2C interface and integrates built-in clock and data recovery (CDR). Optimized for single-mode fiber, it operates at a nominal wavelength of 1310nm. The transmitter uses a 1310nm multiple quantum well DFB laser, compliant with Class 1 laser safety standards under IEC 60825, while the receiver incorporates an InGaAs detector preamplifier (IDP) and a limiting post-amplifier IC for reliable signal processing.
| SPECIFICATIONS | |||
|---|---|---|---|
| Product Model | SFP28-25-13-2(LRL)-LCD | Manufacturer Brand | FC-LINK |
| Package Type | SFP28 | Optical Connector | Duplex LC |
| Max Data Rate | 25.78G | Channel Data Rate | 10.31Gbps |
| Effective Transmission Distance | 2km | ||
| Wavelength | 1310nm | Operating Voltage | 3.3V |
| Fiber Type | SMF | Core Size | 9/125µm |
| Transmitter Type | DFB | Receiver Type | CDR |
| TX Power | -4~2dbm | Receiver Sensitivity | ＜8.4dBm |
| Digital Diagnostic Monitoring(DDM) | YES | Receiver Overload | 2dBm |
| Power Consumption | < 1.2W | Protocols | SFF-8402 |
| Operating Temperature(Commercial) | 0℃~+70℃ | Storage Temperature(Commercial) | -40℃~+85℃ |
| Operating Temperature(Industrial) | -40℃~+85℃ | Storage Temperature(Industrial) | -40℃~+85℃ |
Server-to-Switch Data Center Links
Used for 10G/25G/100G optical uplinks between servers and top-of-rack switches in high-density data center deployments.
Building-to-Building Campus Backbone
Suitable for 1G/10G fiber links between office buildings, campus distribution rooms, and backbone aggregation points.
Access-to-Core Enterprise Uplinks
Designed for switch uplinks from access to aggregation or core layers in enterprise and campus network architectures.
Industrial Switching in Harsh Environments
Applied in industrial Ethernet, automation systems, and outdoor cabinets where wider temperature tolerance and stable fiber communication are required.
Compatible Brands
Customization Options
Vendor Coding
Private Label
Custom Part Number
Packaging Design
Temperature Grade Selection
| Absolute Maximum Ratings | |||||||||
| Parameter | Symbol | Min. | Max. | Unit | |||||
| Storage temperature | Ts | -40 | +100 | °C | |||||
| Supply voltage | Vcc | -0.5 | 4.0 | V | |||||
| Operating relative humidity | RH | 5 | 95 | % | |||||
| *Note:Exceeding any one of these values may destroy the device permanently. | |||||||||
| Recommended Operating Conditions | |||||||||
| Parameter | Symbol | Min. | Typical | Max. | Units | ||||
| Operating case temperature | TC | Standard | 0 | - | 70 | °C | |||
| Extended | -40 | - | 85 | ||||||
| Power supply voltage | Vcc | 3.135 | - | 3.465 | V | ||||
| Power supply current | Icc | Standard | - | - | 360 | mA | |||
| Extended | - | - | 455 | mA | |||||
| Performance Specifications–Electrical | |||||||||
| Parameter | Symbol | Min. | Typ. | Max | Unit | Notes | |||
| Transmitter | |||||||||
| CML inputs(Differential) | Vin | 200 | - | 900 | mVpp | AC coupled inputs | |||
| Input impedance (Differential) | Zin | - | 100 | - | ohms | Connected directly to TX pins | |||
| Tx_DISABLE input voltage - high | - | 2 | - | Vcc+0.3 | V | - | |||
| Tx_DISABLE input voltage - low | - | -0.3 | - | 0.8 | V | - | |||
| Receiver | |||||||||
| CML Outputs (Differential) | Vout | 300 | - | 1000 | mVpp | AC coupled outputs | |||
| Rx_LOS output voltage - high | - | 2 | - | Vcc+0.3 | V | - | |||
| Rx_LOS output voltage - low | - | -0.3 | - | 0.8 | V | - | |||
| Optical and Electrical Characteristics | |||||||||
| Parameter | Symbol | Min. | Typical | Max. | Unit | ||||
| 9µm core diameter SMF | - | - | - | 2 | Km | ||||
| Transmitter | |||||||||
| Centre wavelength | λC | 1295 | 1310 | 1325 | nm | ||||
| Spectral width (-20dB) | Δλ | - | - | 1 | nm | ||||
| Average output power@25.78Gb/s | Pout | -4 | - | 2 | dBm | ||||
| Extinction ratio | ER | 3 | - | - | Db | ||||
| Transmitter dispersion penalty | TDP | - | - | 2.7 | Db | ||||
| Receiver | |||||||||
| Centre wavelength | λC | 1260 | 1310 | 1355 | nm | ||||
| Receiver sensitivity(OMA) | Pmin | - | - | -8.4 | dBm | ||||
| Receiver overload | Pmax | 2 | - | - | dBm | ||||
| Optical return loss | ORL | - | - | -26 | Db | ||||
| LOS de-assert | LOSD | - | - | -15 | dBm | ||||
| LOS assert | LOSA | -25 | - | - | dBm | ||||
| LOS hysteresis | - | 0.5 | - | - | Db | ||||
| SFP28 Transceiver Electrical Pad Layout |
| Pin Function Definitions | |||||||||
| Pin Num. | Name | Function | Plug Seq. | Notes | |||||
| 1 | VeeT | Transmitter ground | 1 | Note 5 | |||||
| 2 | TX fault | Transmitter fault indication | 3 | Note 1 | |||||
| 3 | TX disable | Transmitter disable | 3 | Note 2, module disables on high or open | |||||
| 4 | SDA | Module definition 2 | 3 | Data line for serial ID. | |||||
| 5 | SCL | Module definition 1 | 3 | Clock line for serial ID. | |||||
| 6 | MOD_ABS | Module definition 0 | 3 | Note 3 | |||||
| 7 | RS0 | RX rate select(LVTTL). | 3 | Rate select 0, optionally controls SFP28 module receiver. This pin is pulled low to VeeT with a>30K resistor.. | |||||
| 8 | RX LOS | Loss of signal | 3 | Note 4 | |||||
| 9 | RS1 | TX rate select(LVTTL). | 1 | Rate select 1, optionally controls SFP28 module transmitter. This pin is pulled low to VeeT with a >30K resistor. | |||||
| 10 | VeeR | Receiver ground | 1 | Note 5 | |||||
| 11 | VeeR | Receiver ground | 1 | Note 5 | |||||
| 12 | RD- | Inv. received data out | 3 | Note 6 | |||||
| 13 | RD+ | Received data out | 3 | Note 6 | |||||
| 14 | VeeR | Receiver ground | 1 | Note 5 | |||||
| 15 | VccR | Receiver power | 2 | 3.3V ± 5%, Note 7 | |||||
| 16 | VccT | Transmitter power | 2 | 3.3V ± 5%, Note 7 | |||||
| 17 | VeeT | Transmitter ground | 1 | Note 5 | |||||
| 18 | TD+ | Transmit data in | 3 | Note 8 | |||||
| 19 | TD- | Inv. transmit data in | 3 | Note 8 | |||||
| 20 | VeeT | Transmitter ground | 1 | Note 5 | |||||
| Notes: 1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor on the host board. Pull up voltage between 2.0V and VccT/R+0.3V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V. 2) TX disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7K – 10 KΩ resistor. Its states are: Low (0 – 0.8V): Transmitter on (>0.8, < 2.0V): Undefined High (2.0 – 3.465V): Transmitter Disabled Open: Transmitter Disabled 3) Module Absent, connected to VeeT or VeeR in the module. 4) RX LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor. Pull up voltage between 2.0V and VccT/R+0.3V. When high, this output indicates the received optical power is below the worst-case receiver sensitivity (as defined by the standard in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.8V. 5) The module signal ground contacts, VeeR and VeeT, should be isolated from the module case. 6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which should be terminated with 100Ω (differential) at the user SERDES. The AC coupling is done inside the module and is thus not required on the host board. 7) VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the SFP+ connector pin. Maximum supply current is 360mA. Inductors with DC resistance of less than 1 ohm should be used in order to maintain the required voltage at the SFP+ input pin with 3.3V supply voltage. When the recommended supply-filtering network is used, hot plugging of the SFP+ transceiver module will result in an inrush current of no more than 30mA greater than the steady state value. VccR and VccT may be internally connected within the SFP+ transceiver module. 8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω differential termination inside the module. The AC coupling is done inside the module and is thus not required on the host board. |
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Performance Testing
Each module is tested before shipment to help ensure stable optical and electrical performance.
Compatibility Verification
Compatibility validation is available for major switch and router platforms.
Reliability Screening
Selected products support aging, temperature cycle, and stability testing for demanding applications.
Traceable Quality Control
Inspection and production records support more consistent quality control and batch traceability.
