1.25G SFP SX Transceiver for 550m MMF Links, 850nm Duplex LC
SFP-1.25-85-055-LCD
- Broad Multi-Brand Compatibility
- Flexible Customization Support
- Tested for Reliable Performance
- Fast Response & Delivery
- Professional Technical Support
The FC-LINK SFP 1.25G 850nm 550m LC DX Transceiver series is a compact multi-mode module designed for high-speed bi-directional optical data communication, supporting 550m transmission distance; these small form-factor pluggable (SFP) modules are compatible with Gigabit Ethernet 1000BASE-SX and Fiber Channel FC-PH-2 standards (100-M5-SN-1/100-M6-SN-1), featuring a 20-pin connector enabling hot-plug functionality. Optimized for multi-mode fiber operation at 850nm wavelength, the transmitter integrates a Vertical Cavity Surface Emitting Laser (VCSEL) compliant with IEC-60825 Class 1 laser safety standards, while the receiver incorporates an advanced optical detection system with integrated GaAs detector preamplifier (IDP) mounted in an optical header and precision limiting post-amplifier IC.
| SPECIFICATIONS | |||
|---|---|---|---|
| Product Model | SFP-1.25-85-055-LCD | Manufacturer Brand | FC-LINK |
| Package Type | SFP | Optical Connector | Duplex LC |
| Max Data Rate | up to 1.25Gbps | Channel Data Rate | - |
| Effective Transmission Distance | 550M | ||
| Wavelength | 850nm | Operating Voltage | 3.3V |
| Fiber Type | MMF | Core Size | 50/125µm |
| Transmitter Type | VCSEL | Receiver Type | IDP |
| TX Power | -9.5~-3dbm | Receiver Sensitivity | -17dbm |
| Digital Diagnostic Monitoring(DDM) | YES | Receiver Overload | -3dBm |
| Power Consumption | <1W | Protocols | SFP MSA |
| 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 | -4.0 | +85 | ℃ | |||||
| Supply voltage | VCC | -0.5 | 3.6 | V | |||||
| Operating relative humidity | - | - | 95 | % | |||||
| Exceeding any one of these values may destroy the device immediately | |||||||||
| Recommended Operating Environment | |||||||||
| Operating case temperature | Tc | SFP-1.25-85-055-LCD | 0 | - | +70 | °C | |||
| -40 | - | +85 | |||||||
| Power supply voltage | Vcc | 3.15 | 3.3 | 3.45 | V | ||||
| Power supply current | Icc | - | - | 300 | mA | ||||
| Date rate | GBE | - | - | 1.25 | - | Gbps | |||
| FC | - | 1.063 | - | ||||||
| Performance Specifications – Electrical | |||||||||
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes | |||
| Transmitter | |||||||||
| LVPECL inputs(Differential) | Vin | 500 | - | 2000 | mVpp | AC coupled inputs | |||
| Input impedance (Differential) | Zin | 85 | 100 | 115 | ohm | Rin > 100 kohm @ DC | |||
| TX_disable | Disable | - | 2 | - | Vcc | V | - | ||
| Enable | - | 0 | - | 0.8 | - | ||||
| TX_FAULT | Fault | - | 2 | - | Vcc+0.3 | V | - | ||
| Normal | - | 0 | - | 0.5 | - | ||||
| Receiver | |||||||||
| LVPECL outputs (Differential) | Vout | 370 | - | 2000 | mVpp | AC coupled output | |||
| Output impedance (Differential) | Zout | 85 | 100 | 115 | ohms | - | |||
| RX_LOS | LOS | - | 2 | - | Vcc+0.3 | V | - | ||
| Normal | - | 0 | - | 0.8 | V | - | |||
| MOD_DEF ( 2:0 ) | VoH | 2.5 | - | - | V | With serial ID | |||
| VoL | 0 | - | 0.5 | V | |||||
| Optical and Electrical Characteristics | |||||||||
| Parameter | Symbol | Min. | Typical | Max. | Unit | ||||
| 50µm core diameter MMF | L | - | 550 | - | m | ||||
| Data rate | - | - | 1.063/1.25 | - | Gbps | ||||
| Transmitter | |||||||||
| Center wavelength | λC | 830 | 850 | 860 | nm | ||||
| Spectral width (RMS) | Δλ | - | - | 0.85 | nm | ||||
| Average output power | Pout | -9.5 | - | -3 | dBm | ||||
| Extinction ratio | ER | 9 | - | dB | |||||
| Rise/Fall time(20%～80%) | tr/tf | - | - | 260 | ps | ||||
| Total jitter | TJ | - | - | 0.43 | UI | ||||
| Output optical eye | IEEE802.3z and ANSI fiber channel compliant | ||||||||
| TX disable assert time | t_off | - | - | 10 | us | ||||
| Receiver | |||||||||
| Center wavelength | λC | 760 | - | 860 | nm | ||||
| Receiver sensitivity | Pmin | -3 | - | -17 | dBm | ||||
| Receiver overload | Pmax | - | - | - | dBm | ||||
| Return loss | - | 12 | - | - | dB | ||||
| LOS de-assert | LOSD | - | - | -18 | dBm | ||||
| LOS assert | LOSA | -35 | - | - | dBm | ||||
| LOS hysteresis | - | 1 | - | - | dB | ||||
| FUNCTIONAL DESCRIPTION OF TRANSCEIVER |
| SFP TRANSCEIVER ELECTRICAL PAD LAYOUT |
| PIN FUNCTION DEFINITIONS | |||||||||
| Pin | Name | Function | Plug Seq. | Notes | |||||
| 1 | VeeT | Transmitter ground | 1 | 5) | |||||
| 2 | TX Fault | Transmitter fault indication | 3 | 1) | |||||
| 3 | TX Disable | Transmitter disable | 3 | 2) Module disables on high or open | |||||
| 4 | MOD-DEF2 | SDA | 3 | 3) 2 wire serial ID interface. | |||||
| 5 | MOD-DEF1 | SCL | 3 | 3) 2 wire serial ID interface. | |||||
| 6 | MOD-DEF0 | MOD_ABS | 3 | 3) Grounded within the module. | |||||
| 7 | Rate Select | Not connect | 3 | Function not available | |||||
| 8 | LOS | Loss of signal | 3 | 4) | |||||
| 9 | VeeR | Receiver ground | 1 | 5) | |||||
| 10 | VeeR | Receiver ground | 1 | 5) | |||||
| 11 | VeeR | Receiver ground | 1 | 5) | |||||
| 12 | RD- | Inv. received data out | 3 | 6) | |||||
| 13 | RD+ | Received data out | 3 | 7) | |||||
| 14 | VeeR | Receiver ground | 1 | 5) | |||||
| 15 | VccR | Receiver power | 2 | 7) 3.3V ± 5% | |||||
| 16 | VccT | Transmitter power | 2 | 7) 3.3V ± 5% | |||||
| 17 | VeeT | Transmitter ground | 1 | 5) | |||||
| 18 | TD+ | Transmit data In | 3 | 8) | |||||
| 19 | TD- | Inv. transmit data In | 3 | 8) | |||||
| 20 | VeeT | Transmitter ground | 1 | 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 kinds. 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 shutdown 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) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7K – 10K resistor on the host board. The pull-up voltageshall be VccT or VccR . Mod-Def 0 is grounded by the module to indicate that the module is present Mod-Def 1 is the clock line of two wire serial interface for serial ID Mod-Def 2 is the data line of two wire serial interface for serial ID 4) LOS 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) VeeR and VeeT may be internally connected within the SFP module. 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. 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 300Ma. Recommended host board power supply filtering is shown below. Inductors with DC resistance of less than 1ohm 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. |
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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.
