QLogic FTLF8536P4BCL-QL Compatible 10G/25G Dual-Rate SFP28 Transceiver

EdgeOptic's FTLF8536P4BCL-QL compatible is a QLogic-coded version of the EdgeOptic 25G-SFP28-100 multi-vendor SFP28 dual-rate 10G/25G SR transceiver. The QLogic ordering codes covering this part are FTLF8536P4BCL-QL and the alternate QLogic catalog name SFP25-SR-SP. Both designations point to the same 25GBASE-SR optic programmed for QLogic FastLinQ converged network adapters such as the QL41262 dual-port 10/25GbE SFP28 adapter.

The module operates at 25GBASE-SR per IEEE 802.3by Clause 112 with host RS-FEC per Clause 108 when the FastLinQ adapter has FEC enabled, and at 10GBASE-SR per IEEE 802.3ae with no host FEC required. Line rate is 10.3125 Gbps at 10GBASE-SR and 25.78125 Gbps at 25GBASE-SR, within the SFP28 SerDes operating range defined by SFP28 MSA SFF-8402.

Optical path is 850 nm VCSEL transmitter, PIN photodiode receiver, TX optical power −5 to +2.4 dBm, RX sensitivity better than −10.3 dBm, 5.3 dB link budget, LC/UPC duplex connector. Reach is 100 m on OM4 and 70 m on OM3. Digital diagnostics are SFF-8472 Rev 12.2 compliant, exposing per-module temperature, supply voltage, TX bias, TX power, and RX power. Power dissipation is 0.3 W, the module is hot-swappable, and the operating temperature range is 0 to 70°C commercial.

FTLF8536P4BCL-QL is the QLogic-branded variant of the Finisar/Coherent FTLF8536P4BCL 25G SFP28 SR transceiver. The bare FTLF8536P4BCL is the Finisar catalog identity used in Lenovo, Dell, and other adapter vendors' BOMs; the QLogic-coded version is what QL41262 and similar FastLinQ adapters expect in their slots. EdgeOptic's compatible programs to the QLogic-coded identity so the module registers cleanly on FastLinQ adapter slots. Finisar merged with II-VI Incorporated in 2019 and II-VI rebranded as Coherent Corp in 2022, so the underlying optical silicon now also appears under Coherent Finisar branding in distribution channels.

QLogic was acquired by Cavium in 2016 and Cavium was acquired by Marvell in 2018, so QLogic FastLinQ adapter assets and the FTLF8536P4BCL-QL ordering relationship sit under Marvell today. Marvell does not maintain a public hardware compatibility tool for the FastLinQ accessory transceivers, so the working reference is the FastLinQ adapter user guide for the host platform and the legacy QLogic adapter compatibility documentation. Verify the FTLF8536P4BCL-QL part number against the FastLinQ adapter's optic table before commissioning.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Ships next business day from EU stock with a lifetime warranty. For multi-site FastLinQ adapter rollouts where FTLF8536P4BCL-QL or the SFP25-SR-SP alternate code is on the BOM, or where the bare Finisar FTLF8536P4BCL identity is the preferred host code instead of the QLogic-coded variant, contact our sales team.