1.25G SFP 850nm 550m Transceiver

1000BASE-SX SFP 850nm 550m Transceiver

IP-QELS55M85CSmall Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). Includes: the LD driver, the limiting amplifier, the digital diagnostic monitor, the 850nm VCSEL laser and the PIN/TIA. The module data link up to 550m in 50/125umMulti-mode fiber.

This transceiver meets the Small Form Pluggable (SFP) industry standard package utilizing an integral LC-Duplex optical interface connector. An enhanced Digital Diagnostic Monitoring Interface compliant with SFF-8472 has been incorporated into the transceiver. It allows real time access to the transceiver operating parameters such as transceiver temperature, laser bias current, transmitted optical power, received optical power and transceiver supply voltage by reading a built-in memory with I²C interface.

The optical output can be disabled by a LVTTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I²C register access.


  • Up to 1.25Gb/s data links
  • 850nm VCSEL laser transmitter and PIN/TIA receiver 
  • Up to 550km on 50/125µm SMF
  • Hot-pluggable SFP footprint
  • Duplex LC/UPC type pluggable optical interface
  • Low power dissipation
  • Metal enclosure, for lower EMI
  • RoHS compliant and lead-free
  • Support Digital Diagnostic Monitor interface
  • Single +3.3V power supply
  • Compliant with SFF-8472
  • Case operating temperature
  • Commercial: 0°C to +70°C


Model name 1000BASE-SX SFP 850nm 550m Module Brand Inphilight
Package type SFP Transmission rate 1000Mbps
wavelength 850nm The longest transmission distance 550m@OM2 MMF
interface LC duplex Laser type VCSEL 850nm
Fiber type Multimode MMF Digital diagnosis (DDM/DOM) Yes
Emitted light power -9.5 ~-3dBm Receiving sensitivity <-17dBm
Commercial temperature 0 ~ 70°C (32 ~ 158°F) Extension temperature -5 ~ 85°C (23 ~ 185°F)
Industrial temperature -40 ~ 85°C (-40 ~ 185°F) Protocol MSA, IEEE 802.3z


  • Switch to Switch Interface
  • Fast Ethernet
  • Switched Backplane Applications
  • Router/Server Interface
  • Other Optical Links

Here to download the full details of 1.25G SFP 850nm 550m Optical Module.

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