Finisar FTLF8538P4BCL Compatible 25GBASE-SR SFP28 Transceiver
Finisar compatible FTLF8538P4BCL - Key Features
- Compatibility: Finisar
- Media Type: Multi-Mode Fiber (MMF) -OM3/OM4/OM5
- Fiber Count: Duplex
- Connector: Double LC/UPC
- Maximum Distance: 100 m
- Average Link Budget: 5.3 dB
- Tx Wavelength: 850 nm
- Supported Data Rate: 8.5 Gbps - 25.78 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Host FEC Supported
- Temperature Range: Standard 0°-70°C
Finisar FTLF8538P4BCL Price
In Stock - Ships Next Business DayFinisar compatible FTLF8538P4BCL Specifications
Form Factor | SFP28 |
Media Type | Multi-Mode Fiber (MMF) -OM3/OM4/OM5 |
Fiber Count | Duplex |
Connector | Double LC/UPC |
Maximum Distance | 100 m |
Average Link Budget | 5.3 dB |
TX Wavelength | 850 nm |
RX Wavelength | 850 nm |
Supported Data Rate | 8.5 Gbps - 25.78 Gbps |
Supported Ethernet Applications | 10G Ethernet (10.31Gbps), 25G Ethernet (25.78Gbps) |
DDM/DOM | Supported |
Forward Error Correction (FEC) | Host FEC Supported |
Transmitter Type | VSCEL Laser |
Average Launch Power (Min) Each Lane | -5 dBm |
Average Launch Power (Max) Each Lane | 2.4 dBm |
Extinction Ratio (Min) | 3 dB |
Receiver Type | PIN photodiode |
Rx Wavelength Bandwidth | 20 nm |
Average Receiver Sensitivity (Min) Each Lane | -10.3 dBm |
Average Receiver Sensitivity (Max) Each Lane | 2.4 dBm |
Receiver Overload | 2.4 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 0.3 W |
Power | +3.3V single power supply |
Compliance | SFF-8432, CE, Class 1 FDA and IEC60825-1 Laser Safety Compliant, RoHS, SFF-8431, SFF-8472, SFP28 MSA |
Finisar compatible FTLF8538P4BCL Datasheet
v3Complete technical specifications and product details
Finisar compatible FTLF8538P4BCL Description
EdgeOptic’s FTLF8538P4BCL compatible is a Finisar-coded 25GBASE-SR SFP28 version of the EdgeOptic 25G-SFP28-100 multi-vendor 25GBASE-SR SFP28 transceiver. The original Finisar FTLF8538P4BCL is a single-rate 25G part, without the 10GBASE-SR fallback mode that some SFP28 modules provide. The EdgeOptic compatible inherits the dual-rate 10G + 25G envelope from the 25G-SFP28-100 platform, covering the FTLF8538P4BCL replacement use case at 25G with margin for 10G fallback on mixed-speed infrastructure. The module is an SFP28 part per SFF-8402 MSA, not an SFP+ part; legacy references describing it as SFP+ are incorrect.
Optical specs follow the family root: 850 nm VCSEL transmitter, PIN photodiode receiver, TX power −5 to +2.4 dBm, RX sensitivity −10.3 dBm, 5.3 dB link budget. Reach is 100 m on OM4, 100 m on OM5, and 70 m on OM3 over an LC/UPC duplex connector; Finisar also characterizes 20 m on OM2 per published specifications for legacy multimode plants, but OM2 is informative only and is not normative under IEEE 802.3by Clause 112. RS-FEC per IEEE 802.3by Clause 108 (RS(528,514)) applies when the host port enables it; verify FEC configuration against the specific switch platform documentation. Electrical interface is SFP28 per SFF-8431 / SFF-8432. Line rate spans 10.31 to 25.78 Gbps on the EdgeOptic compatible, covering both 10GBASE-SR and 25GBASE-SR host rates.
This is the commercial-temperature (0 to 70°C) version of the Finisar P4 generation, designed for standard SFP28 cage layouts. Power dissipation on the OEM P4 part is 1.2 W maximum; the P5 successor FTLF8538P5BCL runs at approximately 0.3 W with identical optics. Buyers replacing modules in existing P4-populated slots generally match P4 to preserve the original per-port power and thermal envelope; new 25G-only deployments typically specify the P5 successor where available.
Digital diagnostics are SFF-8472 Rev 12.2 compliant, exposing per-module temperature, supply voltage, TX bias, TX power, and RX power. The module is hot-swappable and RoHS compliant per the original Finisar specification. The FTLF8538P4BCL is specified into 25G switch populations: converged-fabric spine ports, 25G-native top-of-rack slots, and host-port configurations that drive the SFP28 cage at 25G. EdgeOptic’s FTLF8538P4BCL compatible is coded to match the Finisar EEPROM identity for drop-in replacement in Finisar-populated slots and additionally supports 10GBASE-SR for mixed-speed hosts that drive the same SFP28 cage at 10G.
Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Ships next business day from EU stock with a lifetime warranty. For P4-populated 25G Finisar slots that must stay on the 1.2 W P4 envelope rather than move to the P5 successor, contact our sales team.
Frequently Asked Questions
Is the FTLF8538P4BCL an SFP+ or SFP28 module, and will it fit an SFP28 port?
The FTLF8538P4BCL is an SFP28 module, not SFP+. Vendor listings (TransceiverUSA, ATGBICS, AddOn Networks) identify it as a 25GBASE-SR SFP28 part per SFF-8402 MSA, operating at 25.78 Gbps per IEEE 802.3by Clause 112. Legacy page content describing this part as 'SFP+' is incorrect; SFP+ is a 10G form factor. The module fits a standard SFP28 cage. SFP28 cages are electrically backward-compatible with SFP+ modules, but the FTLF8538P4BCL is intended and rated for 25G SFP28 hosts.
Does the OEM FTLF8538P4BCL support 10GBASE-SR fallback, or is it 25G-only?
The OEM Finisar FTLF8538P4BCL is single-rate 25G only, without the 10GBASE-SR fallback mode that some SFP28 modules provide. The EdgeOptic compatible inherits the dual-rate 10G + 25G envelope from the 25G-SFP28-100 platform, so it covers the FTLF8538P4BCL replacement use case at 25G and adds 10GBASE-SR support for mixed-speed infrastructure where the host port may run at 10G. This page targets FTLF8538P4BCL replacement specifically.
Should I choose the FTLF8538P4BCL (P4) or the FTLF8538P5BCL (P5) successor?
The two parts share identical optics: same 850 nm VCSEL, 100 m OM4 and 70 m OM3 reach, 5.3 dB budget, SFP28 cage. The difference is power. P4 draws 1.2 W maximum on the OEM datasheet; P5 is approximately 0.3 W. For replacements in existing P4-populated slots where the deployment thermal envelope was planned against 1.2 W per port, the P4 BCL preserves the original budget. For new deployments where the vendor has qualified the P5 successor, P5 is the lower-power choice. Optically either part closes the same link.
What fiber types and distances does the FTLF8538P4BCL support?
100 m on OM4 or OM5, and 70 m on OM3. Finisar additionally characterizes 20 m on OM2 per the P4 datasheet, but OM2 is informative only; IEEE 802.3by Clause 112 normative reach covers OM3 and OM4 (OM5 is supported by extension at 850 nm). The transmitter is 850 nm VCSEL and the connector is LC/UPC duplex. OM5 reach matches OM4 at 25GBASE-SR; OM5 fiber adds wideband SWDM4 support at other wavelengths, but the 850 nm SR reach is unchanged. Single-mode fiber is not supported; for SMF 25G reach use a 25GBASE-LR module.