The LINK-PP L9-SD851G-S5CTI is an industrial-grade 1.25Gbps 1x9 optical transceiver engineered for robust high-speed communication networks. Utilizing an 850nm VCSEL laser and Duplex SC interface, this high-performance module guarantees reliable multi-mode fiber transmission up to 500m. Operating across severe temperatures from -40°C to +85°C, it perfectly supports Gigabit Ethernet and precise industrial networking deployments.
LINK-PP Part Number
L9-SD851G-S5CTI
Vendor Name
LINK-PP
Form Factor
1x9
Max Data Rate
1.25Gbps
Wavelength
850nm
Max Cable Distance
500m
Connector
Duplex SC
Fiber Type
MMF
Transmitter Type
VCSEL
Receiver Type
PIN
Differential Input/ Output
CML
Signal Detect
TTL
Power Supply
3.3V
Operating Temperature Range
-40 to 85°C
Key Features of LINK-PP L9-SD851G-S5CTI
The industrial LINK-PP L9-SD851G-S5CTI module features a single 3.3V power supply, highly efficient VCSEL diode, and reliable CML differential input/output. Designed strictly to multi-sourced 1x9 protocol standards, it includes advanced TTL signal detection, ensuring highly secure, uninterrupted optical link performance in rugged environments.
Standard 1x9 Package for Reliable PCB Mounting
This robust fiber optic transceiver utilizes the industry-standard 1x9 package footprint, facilitating secure, direct PCB wave soldering and integration. Its durable pin-through-hole design ensures exceptional mechanical stability, preventing connection drops in vibration-prone industrial communication systems.
1.25G Connectivity for Gigabit Ethernet & Fiber Channel
Engineered for demanding broadband applications, the L9-SD851G-S5CTI delivers seamless 1.25Gbps data rates. This high-speed connectivity perfectly complies with both Gigabit Ethernet and 1.06Gbps Fiber Channel protocols, enabling lightning-fast data processing for modern enterprise infrastructure.
850nm Wavelength for Optimal Multimode Performance
Integrating a premium 850nm VCSEL transmitter, this 1.25G optical module ensures superior signal integrity over 50/125μm multimode fiber. The optimized 850nm wavelength minimizes signal attenuation, providing excellent data fidelity and long-term laser diode reliability.
Stable 500m Transmission for Short-Reach Networks
Designed specifically for localized networking environments, the L9-SD851G-S5CTI transceiver guarantees highly stable optical transmission up to 500 meters. Cost-effective solution for short-reach digital video transmission and enterprise campus interconnects.
Duplex SC Interface with Low EMI Design
Featuring a standard Duplex SC optical receptacle, this 1x9 fiber optic module provides flawless optical alignment. The ruggedized SC connector interface combined with optimized internal shielding significantly reduces electromagnetic interference, maintaining pure networking signals.
LINK-PP L9-SD851G-S5CTI 1.25G 1x9 Certification
The L9-SD851G-S5CTI is a fully certified industrial transceiver, meeting stringent international standards including CE, FCC, UKCA, UL, and REACH to guarantee supreme operational safety and environmental compliance.
LINK-PP enforces an uncompromising quality control program. Every single L9-SD851G-S5CTI module undergoes comprehensive pre-shipment inspections to ensure consistent industrial-grade performance and zero-defect optical communication reliability.
Compliant with Class 1 Laser Safety Standard IEC 825, this robust transceiver ensures excellent ESD protection and low EMI, meeting rigorous global telecommunication regulatory requirements.
This product is in conformity with ISO9001. This system is valid to a company engaging in development, production and supply service of fiber optical products. Please contact us to learn more.
ISO/IEC 27001 is an international standard for managing and processing information security. This standard is jointly developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It sets out requirements for establishing, implementing, maintaining, and continually improving an information security management system (ISMS). Ensuring the confidentiality, integrity, and availability of organizational information assets, obtaining an ISO 27001 certificate means that the enterprise has passed the audit conducted by a certification body, proving that its information security management system has met the requirements of the international standard. Please contact us to learn more.
This product is in conformity with ISO14001.It is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. Please contact us to learn more.
ISO 45001 is a global standard that sets out the requirements for an occupational health and safety management system (OH&SMS).
REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system. The regulation aims to protect human health and environmental safety, maintain and improve the competitiveness of the EU chemical industry, and develop innovative capabilities for non-toxic and harmless compounds to prevent market fragmentation, increase the transparency of the use of chemicals, promote non-animal experiments, and pursue sustainable social development.Please contact us to learn more.
This product meets the applicable requirements of Directive (EU) 2015/863 of RoHS. It restricts the use of 10 hazardous materials in the manufacture of various types of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and four different phthalates. Please contact us to learn more.
This product fully accords with the FCC, which aims to manage the radio wave and magnetic fields more reasonably. Please contact us to learn more.
CB is an international system operated by IECEE. This product is based on IEC standards for testing the safety performance of electrical products. Please contact us to learn more.
This product fully accords with UKCA (UK Conformity Assessed) certificate, which signifies that it meets all relevant quality standards as well as health and safety requirements. Please contact us to learn more.
UL certification is a non-mandatory certification in the United States,mainly testing and certification of product safety performance.Its ultimate purpose is to obtain products with a fairly safe level for the market,and to contribute to ensuring human health and property safety.Please contact us to learn more.
Certified for Seamless PCB Integration & Protocol Compatibility
Fully compatible with the multi-sourced 1x9 protocol, this highly versatile component guarantees fast, seamless PCB integration for original equipment manufacturers designing advanced Gigabit Ethernet hardware.
Rigorous Testing Ensures Reliable 1x9 Performance
Advanced laboratory testing validates the absolute stability of the L9-SD851G-S5CTI, guaranteeing flawless data transmission and enduring hardware functionality under extreme conditions.
Optical Spectrum Test
Evaluates the 850nm center wavelength and spectral width to guarantee perfect optical precision.
Eye Pattern Test
Verifies complete compliance with IEEE 802.3 standards for clear, distortion-free optical output signals.
Bit Error Rate Test
Confirms flawless 1.25Gbps data processing capabilities, eliminating packet loss across the fiber network.
Temperature Test
Assures uninterrupted, stable operation throughout the extreme -40°C to +85°C industrial temperature range.
Product Shipping for LINK-PP L9-SD851G-S5CTI 1.25G 1x9
LINK-PP provides secure and professional global shipping solutions, ensuring your high-speed networking components arrive safely, perfectly intact, and strictly on schedule.
To use the LINK-PP L9-SD851G-S5CTI 1.25G 1x9 transceiver, carefully solder the 9 pins directly onto your PCB, strictly avoiding wave soldering. Provide 3.3V power, then plug your multimode fiber into the Duplex SC port to initiate data transmission.
L9-SD851G-S5CTI Technical Support
LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.
Pre-Sales Technical Consultation
Professional technical guidance to help customers select the most suitable L9-SD851G-S5CTI modules based on network architecture and application requirements.
Compatibility Verification Support
Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.
Deployment & Installation Assistance
Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.
A:
The L9-SD851G-S5CTI reaches up to 500m over 50/125μm (OM2/OM3) multimode fiber at 850nm. On legacy 62.5/125μm (OM1) fiber, typical reach is up to 275m due to modal dispersion of the fiber cable. By
admin
A:
The 1x9 housing and pins withstand standard lead-free wave soldering up to 260°C for 10 seconds on the solder pins. Always keep the optical Duplex SC port capped during wave soldering and board washing. By
admin
A:
It operates on a single +3.3V power supply and features differential CML (Current Mode Logic) AC-coupled data inputs/outputs along with a TTL-level Signal Detect output on Pin 4. By
admin
A:
Yes, the L9-SD851G-S5CTI is fully RoHS 2.0 compliant, meets EN/IEC 60825-1 Class 1 eye-safety standards, and we can provide full CE/FCC/RoHS declarations of conformity with your shipment. By
admin
Please write comments with more than three
character.
496509
576557
L***g
Finland
Verified
Purchase
5 .0
2026-09-28
We manufacture ruggedized media converters for wind turbine nacelles and standardized on the L9-SD851G-S5CTI. The 850nm VCSEL transmitter and PIN receiver handle high vibration and -40°C cold starts without link flaps.
Please write comments with more than three
character.
496509
576572
S***r
Denmark
Verified
Purchase
5 .0
2026-08-19
Used these 1.25Gbps Duplex SC 1x9 modules for server room batch deployment and short-reach data center interconnect over OM3 multimode fiber. Differential CML signals and TTL signal detection worked right out of the box.
Canada · English · CAD
