Sopto 1.25Gbps SFP Optical Transceiver — P851G-S5D, 850 nm, 550 m

The Sopto SPT-P851G-S5D is a 1.25Gbps SFP optical transceiver designed for short-reach multi-mode fiber links. Operating at 850 nm wavelength, it supports distances up to 550 m via LC connectors. With a hot-pluggable SFP design, digital diagnostics (DDM), and full compliance with IEEE 802.3z 1000BASE-SX, it delivers reliable Gigabit Ethernet connectivity for enterprise and campus networks.

Description

The Sopto SPT-P851G-S5D is a compact, cost-effective 1.25Gbps multi-mode SFP transceiver built for short-haul optical connections. Featuring an 850 nm VCSEL laser transmitter and PIN photodiode receiver, it provides full-duplex Gigabit transmission over 50/125 µm or 62.5/125 µm multimode fiber with a maximum reach of 550 meters.

Designed to meet IEEE 802.3z 1000BASE-SX and SFP MSA standards, this transceiver ensures interoperability with a wide range of networking devices. The integrated digital diagnostics monitoring (DDM) per SFF-8472 allows real-time monitoring of operating parameters, such as optical power, temperature, and voltage.

With its LC duplex optical interface, hot-pluggable design, and low power consumption (<1 W), the SPT-P851G-S5D is easy to install and maintain in enterprise networks, campus backbones, and access switches. Rugged construction with EMI shielding ensures reliable performance in demanding environments.


Application

Enterprise LANs, Campus networks, Data centers, Short-distance Gigabit fiber links


Key Features

  • ✅ 1.25Gbps Gigabit Ethernet optical transceiver

  • ✅ Operates at 850 nm for multimode fiber

  • ✅ Transmission distance up to 550 m

  • ✅ LC duplex optical connector

  • ✅ Hot-pluggable SFP MSA compliant design

  • ✅ Digital diagnostics monitoring (DDM) supported

  • ✅ Low power consumption (<1 W)

  • ✅ IEEE 802.3z 1000BASE-SX compliant

Specifications

 

SpecificationDetails
BrandSopto
ModelSPT-P851G-S5D
Product TypeSFP Optical Transceiver
Data Rate1.25Gbps
Wavelength850 nm
Fiber TypeMulti-mode fiber (MMF)
Optical InterfaceLC duplex
Maximum Reach550 m
TransmitterVCSEL laser
ReceiverPIN photodiode
Digital DiagnosticsYes (DDM, SFF-8472)
Standards ComplianceIEEE 802.3z 1000BASE-SX, SFP MSA
Power Supply3.3 V DC
Power Consumption< 1 W typical
Hot-PluggableYes
Operating Temperature0 °C to 70 °C (commercial)
Storage Temperature–40 °C to +85 °C
HousingMetal casing with EMI shielding
Package Contents1 × SPT-P851G-S5D module
Warranty9 months

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