155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers

155Mbps to 3.2Gbps, Low-Power SFP Limiting Amplifiers Function as Data Quantizers for OC-3 through OC-48 Synchronous Optical Network (SONET), Fibre-Channel, and Gigabit Ethernet Optical Receivers

Please check latest availability status for a specific part variant.


The MAX3747A/MAX3747B multirate limiting amplifiers function as data quantizers for OC-3 through OC-48 synchronous optical network (SONET), Fibre-Channel, and Gigabit Ethernet optical receivers. They are pin-for-pin compatible with the SY88993V from Micrel Semiconductor, Inc. The amplifiers accept a wide range of input voltages and provide constant-level, current-mode logic (CML) output voltages with controlled edge speeds. The MAX3747A/MAX3747B output voltages are 800mVP-P. The MAX3747B has enhanced LOS operation under overload conditions.

The MAX3747A/MAX3747B limiting amplifiers feature a programmable loss-of-signal detect (LOS) and an optional disable function (DISABLE) that can be combined to implement squelch.

The MAX3747A/MAX3747B are available in a 3mm, 10-pin µMAX® package ideal for small form-factor receivers.
MAX3747, MAX3747A: Typical Application Circuit MAX3747, MAX3747A: Typical Application Circuit Enlarge+

Key Features

  • Pin Compatible with Micrel SY88993V
  • 155Mbps to 3.2Gbps Operation
  • > 57dB of Gain
  • < 10-12 BER with 2mVP-P Input Amplitude
  • 18mA Supply Current
  • Chatter-Free LOS with Programmable Threshold
  • Output DISABLE Function
  • PECL-Compatible Inputs


  • 10G LX4 Transceiver Modules
  • 1G/2G Fibre Channel SFF/SFP Optical Transceiver Modules
  • Gigabit Ethernet SFF/SFP Optical Transceiver Modules
  • Multirate OC-3 to OC-48 FEC SFF/SFP Optical Transceiver Modules

See parametric specs for Limiting Amplifiers (10)

Part NumberTarget Oper. Range
Data Rate
Data Rate
I/O TypeInput Sens.
LOS Sens.
Edge Speed
minmaxtypminmaxSee Notes
MAX3747A 1 to 4.515532003.330CML44.170
$1.61 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3747AEVKIT: Evaluation Kit for the MAX3747, MAX3747A
MAX3747EVKIT: Evaluation Kit for the MAX3747, MAX3747A
MAX3747BEVKIT: Evaluation Kit for the MAX3747B
Product Reliability Reports: MAX3747B.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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