Features and Benefits

  • Fully Compliant with SFP and SFF-8472 MSAs
  • Programmable Modulation Current from 10mA to 60mA (DC-Coupled)
  • Programmable Modulation Current from 10mA to 85mA (AC-Coupled)
  • Programmable Bias Current from 1mA to 100mA
  • Edge Transition Times <51ps
  • 27mA (typ) Power-Supply Current
  • Multirate 155Mbps to 2.7Gbps Operation
  • Automatic Average Power Control
  • On-Chip Pullup Resistor for TX_Disable
  • 24-Pin 4mm x 4mm QFN package

Product Details

The MAX3735A is a +3.3V laser driver for SFP/SFF applications from 155Mbps up to 2.7Gbps. The device accepts differential input data and provides bias and modulation currents for driving a laser. DC-coupling to the laser allows for multirate applications and reduces the number of external components. The MAX3735A is fully compliant with the SFP MSA timing and the SFF-8472 transmit diagnostic requirements.

An automatic power-control (APC) feedback loop is incorporated to maintain a constant average optical power over temperature and lifetime. The wide modulation current range of 10mA to 60mA (up to 85mA AC-coupled) and bias current of 1mA to 100mA make this product ideal for driving FP/DFB laser diodes in fiber-optic modules. The resistor range for the laser current settings is optimized to interface with the DS1858 SFP controller IC.

The MAX3735A provides transmit-disable control, a single-point latched transmit-failure monitor output, photocurrent monitoring, and bias-current monitoring to indicate when the APC loop is unable to maintain the average optical power.

The MAX3735A is available in a 4mm x 4mm TQFN package and operates over the extended temperature range of -40°C to +85°C.


  • 1G/2G Fibre Channel SFF/SFP Optical Transceiver Modules
  • Gigabit Ethernet SFF/SFP Transceiver Modules
  • Multirate OC-3 to OC-48 FEC SFF/SFP Transceiver Modules

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

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MAX3735 Companion Parts

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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