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Finisar FTLF8519F2KCL 1000BASE-SX SFF 2x5 850nm 550m
up to 2.125 Gb/s 1000BASE-SX / 1G-2G FC (2.125G) SFF 2x5 transceiver, 850nm, up to 550m, commercial (0 to 70 °c) temperature.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTLF8519F2KCL
- Family
- FTLF8519F2
- Category
- Fiber optic transceiver modules
- Datasheet
- FTLF8519F2KCL datasheet (PDF)
FTLF8519F2KCL specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTLF8519F2KCL |
| Product family | FTLF8519F2 |
| Form factor | SFF 2x5 |
| Standards / application | IEEE 802.3 Gigabit Ethernet; FC-PI-2 10.0 |
| Data rate | 1.0625 / 1.25 / 2.125 Gb/s |
| Wavelength | 830–860 nm |
| Laser | 850 nm oxide VCSEL |
| Reach | 50/125 µm MMF: 500 m @ 1.0625 Gb/s, 300 m @ 2.125 Gb/s; 62.5/125 µm MMF: 300 m @ 1.0625 Gb/s, 150 m @ 2.125 Gb/s |
| Connector | Duplex LC |
| Tx output power | −9 to −3 dBm |
| Rx sensitivity | −20 dBm @ 1.0625/1.25 Gb/s; −18 dBm @ 2.125 Gb/s |
| Rx overload / max input | 0 dBm |
| Extinction ratio | 9 dB (1.25 Gb/s) |
| Supply voltage | 3.3 V (3.0–3.6 V) |
| Power dissipation | < 750 mW (180 typ / 240 max mA) |
| Operating temperature | Commercial (0 to 70 °C) |
| Compliance | Class 1 laser product; RoHS compliant and lead-free |
| Lifecycle | Legacy / end-of-life |
| Variant note | K = 2 grounding pins, long EMI shield; C = 0 to 70 °C |
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 FTLF8519F2KCL
The Finisar FTLF8519F2KCL (now a Coherent Corp. product, formerly II-VI) is a SFF 2x5 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 is a commercial-temperature part rated 0 to 70 °C. It belongs to Finisar's FTLF8519F2 family, which has 10 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. This is a legacy Finisar part; we help buyers find remaining stock or a current Coherent alternative. Typical uses: Gigabit Ethernet, 1/2/4G Fibre Channel SAN, SONET OC-48 / STM-16 and CWDM/DWDM metro links.
- 2x5 SFF (MSA) footprint
- 850 nm oxide VCSEL laser transmitter
- Duplex LC connector
- Metal enclosure, for lower EMI
- Single 3.3 V power supply
- Low power dissipation
FTLF8519F2KCL: frequently asked questions
What is the Finisar FTLF8519F2KCL?
The FTLF8519F2KCL is a Finisar SFF 2x5 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 FTLF8519F2KCL?
The FTLF8519F2KCL 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 FTLF8519F2KCL?
Per the Finisar family datasheet, the FTLF8519F2KCL transmits −9 to −3 dBm and has a receiver sensitivity of −20 dBm @ 1.0625/1.25 Gb/s; −18 dBm @ 2.125 Gb/s. Maximum receiver input is 0 dBm.
Which fiber and connector does the FTLF8519F2KCL use?
The FTLF8519F2KCL works at 850nm over MMF. Both ends of a link must use the same optical standard.
Will the FTLF8519F2KCL work in my Cisco, Juniper, Arista or HPE switch?
The FTLF8519F2KCL follows the SFF 2x5 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.
FTLF8519F2KCL vs FTLF8519F2GNL: what is the difference?
Both are in Finisar's FTLF8519F2 family. They differ in temperature grade (commercial vs extended). Pick the variant that matches your temperature, latch and wavelength needs.
What temperature range is the FTLF8519F2KCL rated for?
The FTLF8519F2KCL is a commercial-temperature part rated 0 to 70 °C. Choose an industrial (T) variant for outdoor or uncontrolled sites.
What does the FTLF8519F2KCL part number mean?
The FTLF prefix marks Finisar's SFP / SFP28 / SFP56 family (incl. Fibre Channel). The C letter in the suffix usually marks the commercial temperature grade. The remaining characters identify the optical design and build variant.
Is the FTLF8519F2KCL still available?
The FTLF8519F2KCL is a legacy Finisar part, so new production is limited or ended. Next Gen Networks helps source remaining genuine stock and can suggest a current Coherent alternative with the same reach and wavelength.
What is the FTLF8519F2KCL price in India and how do I order?
The Finisar FTLF8519F2KCL 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 FTLF8519F2KCL need?
It runs from 3.3 V (3.0–3.6 V) with power dissipation of < 750 mW (180 typ / 240 max mA).
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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