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Small rectangular metal SFP module with RJ45 port

TP-Link

TP-Link TL-SM331T 1 Gbps RJ45 SFP transceiver 100m

SKU CH-TDR3-VNMR9 MPN TL-SM331T

A copper SFP module adds a 1 Gbps RJ45 port to SFP equipment with a 100 m reach over Cat 5e cabling

  • Port count1 × 1,000 Mbit/s RJ45 Port
  • Product typeTransceiver
  • Supported standardsIEEE 802.3-2002
  • Maximum range100m (Cat 5e or above)
  • Transfer speed1 Gbit/s
  • Temperature rangeOperating Temperature: 0–70 °C (32–158 °F) Storage Temperatu
  • Connect copper links up to 100 metres via SFP ports
  • Plug and play deployment with no software or configuration needed
  • Hot-pluggable design allows module changes without network shutdown
  • Durable metal casing protects the module in demanding environments
  • Operates reliably from 0 to 70 °C for indoor installations

Copper SFP for gigabit switches

The TP-Link TL-SM331T is a 1 Gbps RJ45 SFP transceiver that adds a copper Ethernet port to any device with an SFP slot. It targets network administrators who need to extend a fibre switch or media converter to a Cat 5e or better copper run up to 100 metres. The module follows the IEEE 802.3-2002 standard and requires no software configuration.

Passive thermal range and hot-plug operation

The transceiver operates from 0 to 70 °C and survives storage from -40 to 85 °C without active cooling. A durable metal casing dissipates heat passively, so the unit adds no fan noise to the rack. Hot-pluggable design lets technicians insert or remove the module while the host equipment stays powered, avoiding downtime during maintenance.

SFP slot compatibility and cabling freedom

The module fits any standard SFP port on switches, routers or media converters, freeing the builder from dedicated copper uplinks. It accepts a single RJ45 patch cord up to 100 metres on Cat 5e or above, removing the need for fibre patch cables on short links. The package includes the transceiver and an installation guide.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 96% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameTP-Link
Model nameTL-SM331T
Product typeTransceiver
Performance
Transfer speed1 Gbit/s
Connectivity
Supported standardsIEEE 802.3-2002
Maximum range100m (Cat 5e or above)
Ports & slots
Port count1 × 1,000 Mbit/s RJ45 Port
Size & build
Shipping weight0.09 kg
Package size152 × 102 × 51 mm
In the box
In the box1000BASE-T RJ45 SFP Module TL-SM331T
Installation Guide
Environment & compliance
Temperature rangeOperating Temperature: 0–70 °C (32–158 °F)
Storage Temperature: -40–85 °C (-40–185 °F)

Questions about this item

How do I install the TL-SM331T into an SFP port and what step do people often miss?

Slide the module into the SFP slot until it clicks, then insert a Cat 5e or better RJ45 cable up to 100 m. The step often missed is confirming the host device supports 1000BASE-T copper SFPs before purchase.

What maintenance or replacement will the TL-SM331T need over time?

No scheduled maintenance is required. Keep the RJ45 port free of dust and ensure the operating temperature stays within 0 to 70 °C. Replace the module only if link errors appear or the metal casing is damaged.

What limit appears first when the TL-SM331T runs continuously under load?

The 100 m distance limit over Cat 5e or above cabling is the first constraint. The module also must remain within the 0 to 70 °C operating range, so sustained high ambient heat can become the limiting factor.

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