SFP fiber optic transceiver Cudy SM100GSA-20 1250 Mbit/s 1310 nm single-mode up to 20 km

The Cudy SM100GSA-20 is a fiber optic SFP transceiver module in standard SFP form factor. It supports data transmission up to 1250 Mbit/s over single-mode fiber at a wavelength of 1310 nm and is powered from a +3.3 V supply. The module is compatible with the SFP Multi Source Agreement (MSA) and is intended for Gigabit Ethernet applications compliant with IEEE 802.3 definitions for 1000BASE-T/SFP interfaces. The compact metal housing measures approximately 13.7 mm × 68 mm × 13.8 mm and the product colour is stainless steel.

Advantages

The transceiver provides a standard SFP interface for easy hot-pluggable installation and interoperability with MSA-compliant ports. Its 3.3 V power interface conforms to the typical SFP supply range (±5%), and low-speed control signals conform to open-drain CMOS levels with I2C-accessible PHY settings. The design supports link indication using the SFP RX_LOS pin and allows PHY reset through the SFP TX_DISABLE pull-up.

Suitable for

• Gigabit Ethernet links using SFP ports
• Point-to-point fiber connections at 1310 nm
• Network equipment requiring hot-pluggable SFP transceivers
• Applications needing I2C access to PHY settings

Key specifications

• Manufacturer: Cudy, model SM100GSA-20
• Interface type: SFP (hot-pluggable)
• Maximum data transfer rate: 1250 Mbit/s
• Wavelength: 1310 nm
• Power supply: +3.3 V (±5%)
• Low-speed signals: MOD_DEF(1) (SCL) and MOD_DEF(2) (SDA) open-drain CMOS, require pull-up to host_Vcc
• Link indication: uses SFP RX_LOS pin
• Physical dimensions: 13.7 mm × 68 mm × 13.8 mm
• Product colour: Stainless steel

How to use

Insert the SM100GSA-20 module into a compatible SFP slot while the host is powered according to the host equipment instructions to enable hot-pluggable operation. Provide a +3.3 V supply within the specified ±5% tolerance and avoid continuous exposure to voltages above the allowed range. Ensure MOD_DEF(1) and MOD_DEF(2) lines are pulled up to the host_Vcc to permit I2C communication with the module. Use the RX_LOS pin for link status monitoring and, if required, pull up the TX_DISABLE pin to reset the internal PHY IC.

Usage recommendations

Use the module in MSA-compliant SFP ports and keep the supply voltage within the specified 3.3 V ±5% range. Do not apply voltages up to 4 V for continuous operation. Ensure appropriate pull-up resistors on MOD_DEF lines and follow host equipment guidelines for hot-plugging and PHY configuration via I2C.