3.2Gbps SFP Transimpedance Amplifiers with RSSI

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The MAX3724/MAX3725 transimpedance amplifiers provide a compact, low-power solution for communication up to 3.2Gbps. They feature 325nA input-referred noise at 2.1GHz bandwidth (BW) with 0.6pF input capacitance. The parts also have > 2mAP-P AC input overload.

Both parts operate from a single +3.3V supply and consume 93mW. The MAX3724/MAX3725 are in a compact 30-mil x 50-mil die and require no external compensation capacitor. A space-saving filter connection is provided for positive bias to the photodiode through an on-chip 580Ω resistor to VCC. These features allow easy assembly into a low-cost TO-46 or TO-56 header with a photodiode.

The MAX3724 and MAX3748A receiver chip set provides an RSSI output using a Maxim interface technique. The MAX3724 preamplifier, MAX3748A postamplifier, and the DS1858/DS1859 SFP controller meet all the SFF-8472 digital diagnostic requirements.
MAX3724, MAX3725: Typical Application Circuit MAX3724, MAX3725: Typical Application Circuit Enlarge+

Key Features

  • Wider Bandwidth than MAX3744/MAX3745
  • RSSI Implementation in 4-Pin TO-46 Header (MAX3724 and MAX3748A)
  • 8psP-P Deterministic Jitter for < 100µAP-P Input Current
  • 325nARMS Input-Referred Noise at 2.1GHz Bandwidth
  • 28mA Supply Current at +3.3V
  • 2.5GHz Small-Signal Bandwidth
  • 2.0mAP-P AC Overload
  • Die Size: 30 mils x 50 mils (Identical to the MAX3744/MAX3745)


  • Optimized for Small-Form-Factor Pluggable (SFP) Optical Receivers
  • Up to 3.2Gbps SFF/SFP Optical Receivers
Product Reliability Reports: MAX3724.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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