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Finisar FTLF8519P3BYL 1000BASE-SX SFP 850nm 550m
up to 2.125 Gb/s 1000BASE-SX / 1G-2G FC (2.125G) SFP transceiver, 850nm, up to 550m.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTLF8519P3BYL
- Family
- FTLF8519P3
- Category
- Fiber optic transceiver modules
- Datasheet
- FTLF8519P3BYL datasheet (PDF)
FTLF8519P3BYL specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTLF8519P3BYL |
| Product family | FTLF8519P3 |
| Form factor | SFP |
| Standards / application | IEEE 802.3 1000BASE-SX; FC-PI-2 Rev 5.0 (1x/2x FC) |
| Data rate | 1.0625 / 1.25 / 2.125 Gb/s |
| Wavelength | 830–860 nm |
| Laser | 850 nm oxide VCSEL |
| Reach | 550 m on 50/125 µm MMF, 300 m on 62.5/125 µm MMF (lower rates; reduced at 2.125 Gb/s) |
| Connector | Duplex LC |
| Tx output power | −9 to −2.5 dBm |
| Rx sensitivity | −18 dBm @ 1.0625/1.25 Gb/s; −17 dBm @ 2.125 Gb/s |
| Rx overload / max input | 0 dBm |
| Extinction ratio | 9 dB (1.25 Gb/s) |
| Supply voltage | 3.15–3.46 V |
| Power dissipation | < 500 mW (supply current 120 typ / 144 max mA) |
| Operating temperature | −20 to 85 °C case (N); −40 to 85 °C case (T) |
| Diagnostics | SFF-8472-style digital diagnostics over 2-wire serial (temp, voltage, bias, Tx/Rx power, alarms/warnings) |
| Compliance | Class 1 laser product (FDA/CDRH); RoHS 2011/65/EU, lead-free |
| Lifecycle | Ask for availability |
Optical and electrical values are from the Finisar / Coherent family datasheet; temperature grade is per part number. Confirm critical values with us before ordering.
About the Finisar FTLF8519P3BYL
The Finisar FTLF8519P3BYL (now a Coherent Corp. product, formerly II-VI) is a SFP 1000BASE-SX / 1G-2G FC (2.125G) optical transceiver for up to 2.125 Gb/s links at 850nm over MMF, with reach up to 550m. It belongs to Finisar's FTLF8519P3 family, which has 3 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. Typical uses: Gigabit Ethernet, 1/2/4G Fibre Channel SAN, SONET OC-48 / STM-16 and CWDM/DWDM metro links.
- Up to 2.125 Gb/s bi-directional data links
- Hot-pluggable SFP footprint
- Built-in digital diagnostic functions
- Metal enclosure, for lower EMI
- Single 3.3 V power supply
- 850 nm oxide VCSEL laser transmitter
FTLF8519P3BYL: frequently asked questions
What is the Finisar FTLF8519P3BYL?
The FTLF8519P3BYL is a Finisar SFP transceiver for 1000BASE-SX / 1G-2G FC (2.125G) at up to 2.125 Gb/s. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for Gigabit Ethernet, 1/2/4G Fibre Channel SAN, SONET OC-48 / STM-16 and CWDM/DWDM metro links.
What is the maximum distance of the FTLF8519P3BYL?
The FTLF8519P3BYL is specified for up to 550m over MMF. Long-reach optics may need an attenuator on short links; we can advise based on your link loss.
What is the optical power budget of the FTLF8519P3BYL?
Per the Finisar family datasheet, the FTLF8519P3BYL transmits −9 to −2.5 dBm and has a receiver sensitivity of −18 dBm @ 1.0625/1.25 Gb/s; −17 dBm @ 2.125 Gb/s. Maximum receiver input is 0 dBm.
Does the FTLF8519P3BYL support DDM / digital diagnostics?
Yes. SFF-8472-style digital diagnostics over 2-wire serial (temp, voltage, bias, Tx/Rx power, alarms/warnings). Your switch can read live temperature, voltage, laser bias and Tx/Rx power.
Which fiber and connector does the FTLF8519P3BYL use?
The FTLF8519P3BYL works at 850nm over MMF. Both ends of a link must use the same optical standard.
Will the FTLF8519P3BYL work in my Cisco, Juniper, Arista or HPE switch?
The FTLF8519P3BYL follows the SFP MSA, so it fits any matching port. It carries Finisar's own EEPROM programming; switches that check the module vendor may need a configuration setting or a vendor-branded optic. Send us your switch model and we confirm before dispatch.
FTLF8519P3BYL vs FTLF8519P3BNL: what is the difference?
Both are in Finisar's FTLF8519P3 family and share the same core optics; the suffix marks a different build option (latch, receiver or ordering variant). Pick the variant that matches your temperature, latch and wavelength needs.
What does the FTLF8519P3BYL part number mean?
The FTLF prefix marks Finisar's SFP / SFP28 / SFP56 family (incl. Fibre Channel). The remaining characters identify the optical design and build variant.
Is your FTLF8519P3BYL genuine Finisar?
Yes. Next Gen Networks supplies original Finisar / Coherent modules, not third-party lookalikes or grey-market stock, and shares serial numbers on request.
What is the FTLF8519P3BYL price in India and how do I order?
The Finisar FTLF8519P3BYL price in India depends on quantity, delivery city and current stock. Next Gen Networks supplies it with a GST invoice (input tax credit ready) and pan-India dispatch from New Delhi. Send the part number, quantity and delivery city on WhatsApp +91-7827955775 or email Sales@nextgennetworks.in for a GST quote.
What power does the FTLF8519P3BYL need?
It runs from 3.15–3.46 V with power dissipation of < 500 mW (supply current 120 typ / 144 max mA).
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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