Copper SFP Transceiver LevelOne SFP-3841

LevelOne SFP-3841 is a copper SFP transceiver that converts a 1000BASE-X optical Ethernet port to a 1000BASE-T copper Ethernet port. It supports bi-directional data transfer at rates up to 1.25 Gbps over unshielded twisted-pair Category 5 cable for distances up to 100 meters. The module features a compact RJ-45 connector assembly, a fully metallic enclosure for reduced EMI, and low power consumption, making it suitable for adding copper connectivity to SFP-capable switches and routers.

Advantages

The transceiver is hot-pluggable in a standard SFP footprint, operates over an extended case temperature range (0 °C to +70 °C), and provides access to the physical-layer IC via a 2-wire serial bus. Typical power dissipation is low (approximately 1.05 W), and the compact dimensions (57 mm x 12 mm x 13.7 mm) allow installation in dense networking equipment. The unit meets CE and FCC certification requirements.

Suitable for

• Converting SFP optical ports to copper RJ-45 ports in switches and routers
• Connecting Gigabit Ethernet devices over Cat5 UTP cable up to 100 m
• Field upgrades where hot-pluggable media conversion is required

Key specifications

• Interface type: SFP
• Data rate: up to 1250 Mbit/s (1.25 Gbps)
• Maximum copper reach: 100 m over Cat5 UTP
• Power supply: 3.3 V input
• Typical power dissipation: 1.05 W
• Operating case temperature: 0 °C to +70 °C
• Dimensions: 57 mm x 12 mm x 13.7 mm
• Certifications: CE, FCC

How to use

Install the LevelOne SFP-3841 into an available SFP slot on the host device while the host is powered according to the host manufacturer’s instructions; the module supports hot-plug operation. Connect the RJ-45 connector to the Cat5 UTP cable leading to the copper Ethernet device. Ensure the host system supports 1000BASE-T operation over an SFP SERDES interface and verify link negotiation at 1 Gbps. Monitor the host’s interface status and use the 2-wire serial bus for accessing physical-layer information if required.

Usage recommendations

Use Category 5 or better unshielded twisted-pair cabling for runs up to 100 meters, verify that the host device firmware supports SFP copper modules, and avoid operating environments outside the specified 0 °C to +70 °C case temperature range for reliable performance.