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Finisar FTLF8519P3BNL Compatible LINK-PP LS-MM851G-S5C 1000BASE-SX SFP Optical Transceiver Module

P/N:

LS-MM851G-S5C

Manufacturer:

LINK-PP

Compatible Brand:

Finisar

Compatible P/N:

FTLF8519P3BNL

Compatible Brands: Finisar
Form Factor: SFP
Data Rate: 1G
Distance: ≤550m
Type: Multimode
Connector: Duplex LC
Wavelength: 850nm
P/N: LS-MM851G-S5C
Manufacture: LINK-PP
Compatible Brand: Finisar
Compatible P/N: FTLF8519P3BNL

Product Specifications

LINK-PP Part Number	LS-MM851G-S5C	Finisar Compatible	FTLF8519P3BNL
Form Factor	SFP	Max Data Rate	1.25Gbps
Wavelength	850nm	Max Cable Distance	550m over OM2 MMF
Connector	Duplex LC	Optical Components	VCSEL 850nm
Media	MMF	DOM Support	Yes
Receiver Sensitivity	-18dBm	Receiver Overload	-1dBm
Commercial Temperature Range	0 to 70°C	Protocols	IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant

LINK-PP LS-MM851G-S5C Technical & Compatibility Overview

The LINK-PP LS-MM851G-S5C is a hot-pluggable 1.25Gbps Small Form-factor Pluggable (SFP) duplex LC optical transceiver module designed for 1000BASE-SX Gigabit Ethernet and 1G Fibre Channel optical links. Engineered as a functional and footprint-compatible alternative to the Finisar FTLF8519P3BNL, it operates at a nominal wavelength of 850nm over multimode fiber (MMF), supporting transmission distances up to 550 meters on OM2 MMF. Built with an 850nm VCSEL laser transmitter, PIN photodiode receiver with trans-impedance preamplifier (TIA), and full Digital Optical Monitoring (DOM/DDM) support per SFF-8472, it delivers reliable short-reach optical interconnectivity for enterprise switches, SAN storage arrays, and campus backbones.

Footprint & Protocol Compatibility: Designed for MSA and optical link compatibility with Finisar FTLF8519P3BNL, supporting direct switch-level evaluation and secondary sourcing.
1.25 Gbps Throughput & 550m MMF Range: Delivers 1000BASE-SX Gigabit Ethernet performance over duplex LC multimode fiber up to 550 meters (OM2) / 275 meters (OM1).
850nm VCSEL Subsystem & Signal Integrity: High-reliability 850nm VCSEL transmitter and PIN receiver deliver stable optical performance across high-density switch line cards.
Digital Optical Monitoring (DOM/DDM): Real-time monitoring of TX/RX optical power, laser bias current, module temperature, and supply voltage per SFF-8472.

Key Design Benefits

Short-Reach Multimode Optimization: 850nm VCSEL technology provides cost-effective optical links up to 550m over 50/125μm OM2 MMF and 275m over 62.5/125μm OM1 MMF.
Multi-Vendor Switch Interoperability: Compliant with SFP Multi-Source Agreement (INF-8074i) and IEEE 802.3z standards for broad compatibility across major OEM networking platforms.
Real-Time DOM Diagnostics: Internal digital diagnostics interface (DOM) allows network administrators to monitor live transmit/receive optical power levels and thermal parameters.
Hot-Pluggable SFP Form Factor: Enables module insertion and replacement in active switch or storage host ports without interrupting system power.
Second-Source Supply Continuity: Offers network engineering and procurement teams a qualified alternative to mitigate component lead times and single-source risks.

Optical Architecture & Diagnostic Performance

The LS-MM851G-S5C incorporates electro-optical subsystems directly within a metallic SFP enclosure to ensure signal integrity across 1000BASE-SX optical channels.

Transmitter & Receiver Subsystems

The transmitter incorporates an 850nm VCSEL laser driver supplying reliable optical launch power. The receiver incorporates a PIN photodiode with an integrated trans-impedance preamplifier (TIA) providing -18 dBm receiver sensitivity and a -1 dBm overload threshold across 1.25Gbps data streams.

Digital Diagnostic Monitoring (DOM)

An SFF-8472 compliant MCU control unit monitors real-time operational parameters over a 2-wire serial interface. Monitored metrics include transmitted optical power, received optical power, laser bias current, module operating temperature, and internal supply voltage.

Mechanical & Interface Specifications

Enclosed in a standard metal SFP housing featuring a latching bail mechanism for secure insertion and removal. The optical interface uses an industry-standard Duplex LC/UPC receptacle compatible with multimode fiber (MMF OM1/OM2) patch cables. The module operates within a commercial temperature range of 0°C to 70°C and satisfies Class 1 laser safety requirements.

Target Applications

1000BASE-SX Gigabit Enterprise Networks: Short-reach 1 Gbps optical uplinks between enterprise distribution switches and core routers.
Storage Area Networks (SAN) & 1G Fibre Channel: Reliable optical interconnectivity for storage arrays, tape drives, and server host bus adapters (HBA).
Data Center Intra-Rack & Campus Backbones: Cost-effective optical connectivity across campus distribution links and server clusters over multimode fiber.

Finisar FTLF8519P3BNL Replacement Compatibility Checklist

When evaluating the LINK-PP LS-MM851G-S5C as an alternative to Finisar FTLF8519P3BNL, network engineers should verify the following parameters against their system specification:

Optical Wavelength & Multimode Reach: Confirm 850nm wavelength and multimode fiber (OM1 275m / OM2 550m MMF) cable infrastructure.
Optical Link Attenuation Budget: Verify that link attenuation stays within the -18 dBm receiver sensitivity budget without exceeding the -1 dBm overload limit.
Switch SFP Port Compatibility: Confirm that target switch, router, or SAN ports support standard SFP modules and SFF-8472 DOM protocols.
Operating Temperature Class: Verify that the 0°C to 70°C commercial temperature class matches your indoor switch room environment.

Frequently Asked Questions

Is LINK-PP LS-MM851G-S5C compatible with OEM switches as an alternative to Finisar FTLF8519P3BNL?

Yes. The LS-MM851G-S5C is engineered with SFP MSA (INF-8074i) compliance, 850nm VCSEL optics, 550m reach over OM2 MMF, SFF-8472 DOM support, and standardized EEPROM coding to serve as a functional drop-in alternative for Finisar FTLF8519P3BNL across major OEM networking switch and router SFP ports.

What is the maximum transmission distance supported by the LS-MM851G-S5C?

The LS-MM851G-S5C supports transmission distances up to 550 meters over 50/125μm OM2 multimode fiber and up to 275 meters over 62.5/125μm OM1 multimode fiber at 1.25 Gbps Gigabit Ethernet line rates.

What engineering assets and compliance documentation are available for Finisar FTLF8519P3BNL cross-reference checking?

LINK-PP provides complete technical documentation, including product datasheets, EEPROM coding compatibility tables, mechanical 2D/3D drawings, RoHS compliance certificates, and Class 1 laser safety documentation.

How can procurement and engineering teams request samples or a quotation for LS-MM851G-S5C as an alternative to Finisar FTLF8519P3BNL?

Procurement and engineering teams can contact LINK-PP to request LS-MM851G-S5C evaluation samples for optical, electrical, and switch compatibility verification. After qualification, our technical sales team can provide competitive pricing, production lead-time estimates, MOQ terms, and volume-order support for replacing Finisar FTLF8519P3BNL.

Packaging, Shipping and Global Delivery for Networking Products

Anti-static packaging, shock-resistant protection, fast order dispatch, and reliable worldwide delivery for all LINK-PP networking products.

Anti-Static Protective Packaging

Protect networking products from electrostatic discharge and handling-related damage.

Shock-Resistant Transport Protection

Protect products against physical impacts during storage and international transportation.

Fast Order Processing and Dispatch

Accelerate order handling to ensure quick warehouse deployment.

Global Logistics and International Delivery

Ship products efficiently to customers across worldwide locations.

1G SFP Technical Support and Deployment Assistance

LINK-PP provides expert technical support, from product selection and compatibility verification to deployment and long-term operation.

Pre-Sales Technical Consultation

Technical consultation to help you verify FTLF8519P3BNL compatibility and select the appropriate product for your application.

Compatibility Verification Support

Verification support to help ensure compatibility with your equipment, applications, and deployment requirements.

Deployment & Installation Assistance

Comprehensive step-by-step guidance for installation, configuration, and initial setup, ensuring accurate deployment and reliable, stable operation from the start.

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle, delivering long-term stability for enterprise and carrier-grade networks.

Industry Standards, Compliance and Quality Assurance

LINK-PP products are manufactured under recognized quality management systems and designed to support applicable industry standards, regulatory compliance, and long-term deployment requirements, including IEEE 802.3, RoHS, REACH, ISO 9001, and ISO 14001 where applicable. 「View Quality & Compliance Center」