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Finisar FTLF3436W4BT29 25GE LR SFP28 1291nm CWDM 10km
25 Gb/s 25GE LR / eCPRI CWDM (rate select 25/24.33/10G) SFP28 transceiver, 1291nm CWDM, up to 10km, industrial temperature.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTLF3436W4BT29
- Family
- FTLF3436W4BTxx
- Category
- Fiber optic transceiver modules
- Datasheet
- FTLF3436W4BT29 datasheet (PDF)
FTLF3436W4BT29 specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTLF3436W4BT29 |
| Product family | FTLF3436W4BTxx |
| Form factor | SFP28 |
| Standards / application | SFF-8472 Rev 12.2b; SFF-8432a; SFF-8431 Rev 3.0c |
| Data rate | Up to 25.78 Gb/s; 10.3/9.8 Gb/s supported |
| Wavelength | CWDM 1271 / 1291 / 1311 / 1331 nm |
| Laser | CWDM DFB |
| Receiver | PIN |
| Reach | Up to 10 km on 9/125 µm SMF |
| Connector | Duplex LC |
| Tx output power | −7.0 to +2.0 dBm @25.78G; −8.2 to +0.5 dBm @10.3G |
| Rx sensitivity | −11.3 dBm @25.78G; −12.6 dBm @10.3G; stressed −8.8 dBm OMA |
| Rx overload / max input | +2.2 dBm OMA |
| Extinction ratio | ≥ 3.5 dB |
| Supply voltage | 3.3 V (3.15–3.46 V) |
| Power dissipation | 1.5 W max with established link (433 mA) |
| Operating temperature | Industrial |
| Diagnostics | SFF-8472 digital diagnostics |
| Compliance | RoHS |
| Lifecycle | Current production |
| Variant note | 1291 nm, violet bail |
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 FTLF3436W4BT29
The Finisar FTLF3436W4BT29 (now a Coherent Corp. product, formerly II-VI) is a SFP28 25GE LR / eCPRI CWDM (rate select 25/24.33/10G) optical transceiver for 25 Gb/s links at 1291nm CWDM over SMF, with reach up to 10km. It is an industrial-temperature part. It belongs to Finisar's FTLF3436W4BTxx family, which has 6 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. Typical uses: 25G Ethernet server and leaf links, 5G fronthaul (eCPRI) and 10G-to-25G upgrades.
- 25G RoHS Compliant CWDM SFP+ Transceiver
- Up to 25.78 Gb/s bi-directional data links
- Up to 10 km on 9/125μm SMF
- Built-in digital diagnostic functions
- 1.5W maximum power consumption with established link
- Metal enclosure, for lower EMI
FTLF3436W4BT29: frequently asked questions
What is the Finisar FTLF3436W4BT29?
The FTLF3436W4BT29 is a Finisar SFP28 transceiver for 25GE LR / eCPRI CWDM (rate select 25/24.33/10G) at 25 Gb/s. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for 25G Ethernet server and leaf links, 5G fronthaul (eCPRI) and 10G-to-25G upgrades.
What is the maximum distance of the FTLF3436W4BT29?
The FTLF3436W4BT29 is specified for up to 10km over SMF. 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 FTLF3436W4BT29?
Per the Finisar family datasheet, the FTLF3436W4BT29 transmits −7.0 to +2.0 dBm @25.78G; −8.2 to +0.5 dBm @10.3G and has a receiver sensitivity of −11.3 dBm @25.78G; −12.6 dBm @10.3G; stressed −8.8 dBm OMA. Maximum receiver input is +2.2 dBm OMA.
Does the FTLF3436W4BT29 support DDM / digital diagnostics?
Yes. SFF-8472 digital diagnostics. Your switch can read live temperature, voltage, laser bias and Tx/Rx power.
Which fiber and connector does the FTLF3436W4BT29 use?
The FTLF3436W4BT29 works at 1291nm CWDM over SMF. CWDM/DWDM optics must match the channel of your mux/demux port. Both ends of a link must use the same optical standard.
Will the FTLF3436W4BT29 work in my Cisco, Juniper, Arista or HPE switch?
The FTLF3436W4BT29 follows the SFP28 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.
FTLF3436W4BT29 vs FTLF3436W4BT27: what is the difference?
Both are in Finisar's FTLF3436W4BTxx family. They differ in wavelength (1291nm CWDM vs 1271nm CWDM). Pick the variant that matches your temperature, latch and wavelength needs.
What temperature range is the FTLF3436W4BT29 rated for?
The FTLF3436W4BT29 is an industrial-temperature part. Industrial grade suits outdoor cabinets, telecom huts and plant floors.
What does the FTLF3436W4BT29 part number mean?
The FTLF prefix marks Finisar's SFP / SFP28 / SFP56 family (incl. Fibre Channel). The I letter in the suffix usually marks the industrial temperature grade. The remaining characters identify the optical design and build variant.
Is your FTLF3436W4BT29 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 FTLF3436W4BT29 price in India and how do I order?
The Finisar FTLF3436W4BT29 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 FTLF3436W4BT29 need?
It runs from 3.3 V (3.15–3.46 V) with power dissipation of 1.5 W max with established link (433 mA).
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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