SATA I/SATA II Bidirectional Re-Driver

Dual-Channel Buffer Allows System to Support SATA Gen III Data Rates Over Long Cables and Through Connectors

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The MAX4951 dual-channel buffer is designed to re-drive serial-ATA (SATA) I and SATA II signals and is functional up to 6.0Gbps for next-generation data rates. The MAX4951 can be placed near an eSATA connector to overcome board losses and produce an eSATA-compatible signal level.

The MAX4951 preserves signal integrity at the receiver by reestablishing full output levels, and can reduce the total system jitter (TJ) by squaring up the signal. This device features channel-independent digital boost controls to drive SATA outputs over longer trace lengths, or to meet eSATA specifications. SATA Out-Of-Band (OOB) signaling is supported using high-speed amplitude detection on the inputs, and squelch on the corresponding outputs. Inputs and outputs are all internally 50Ω terminated and must be AC-coupled to the SATA controller IC and SATA device.

The MAX4951 operates from a single +3.3V (typ) supply and is available in a small, 4mm x 4mm, TQFN package with flow-through traces for ease of layout. This device is specified over the 0°C to +70°C operating temperature range.
MAX4951: Typical Application Circuit MAX4951: Typical Application Circuit Enlarge+

Key Features

  • Single +3.3V (typ) Supply Operation
  • Supports SATA I (1.5Gbps) and SATA II (3.0Gbps)
  • Supports up to 6.0Gbps for Next-Generation Applications
  • Meets SATA I, SATA II Input-/Output-Return Loss Mask
  • Supports eSATA Levels
  • Supports SATA Out-of-Band (OOB) Signaling
  • Internal Input/Output 50Ω Termination Resistors
  • Inline Signal Traces for Flow-Through Layout
  • ESD Protection on All Pins: ±5.5kV
  • Space-Saving, 4mm x 4mm, TQFN Package


  • Data Storage/Workstations
  • Desktop Computers
  • Docking Stations
  • Notebook Computers
  • Servers
Part NumberFunctionsInterfaceData Rate
ChannelsPackage/PinsOper. Temp.
maxtypSee Notes
MAX4951 Re-DriverSATA30003.3702
0 to +70$3.02 @1k
See All Repeaters and Buffers (SAS, SATA, PCIe, USB) (13)
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.

Technical Documents

App Note 4804 Measurement Methodology eSATA
App Note 4653 FAQs about Analog Switches
App Note 4257 Using the MAX4951 SATA Bidirectional Redriver to Drive eSATA Cable

Quality and Environmental Data

Product Reliability Reports: MAX4951.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX4951 Macromodel
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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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