High-Accuracy, High-Side Current Monitors in SOT23

Precision, High-Side 10:1 Current Monitor Senses Currents from 10nA to 10mA

Please check latest availability status for a specific part variant.


The MAX4004/MAX4006 precision, high-side, current monitors are specifically designed for monitoring photodiode current in fiber applications. They offer a connection point for the reference current and a monitor output that produces a signal proportional to the reference current. The monitor output of the MAX4004 is a current proportional to the reference current. The monitor output of the MAX4006 is a voltage proportional to the reference current. The current monitors have six decades of dynamic range and monitor reference current of 250nA to 2.5mA with better than 5% accuracy. The photodiode current can be monitored from 10nA to 10mA with reduced accuracy.

The MAX4004/MAX4006 accept a +2.7V to +22V supply voltage, suitable for PIN photodiode applications. (For higher voltage applications, refer to the MAX4007/MAX4008 data sheet.) Internal current limiting (20mA, typ) protects the device against short-circuit-to-ground or excessive current conditions. A clamp diode protects the monitor output from overvoltage. Additionally, these devices feature thermal shutdown if the die temperature reaches +150°C.

The MAX4004/MAX4006 are available in tiny, space-saving 6-pin SOT23 packages, and operate over the extended temperature range of -40°C to +85°C.
MAX4004, MAX4006: Functional Diagrams MAX4004, MAX4006: Functional Diagrams Enlarge+

Key Features

  • Wide Reference Current Dynamic Range
    • Guaranteed 250nA to 2.5mA with 5% Accuracy
    • Extended 10nA to 10mA with 10% Monitor Accuracy
  • Current (MAX4004) or Voltage (MAX4006) Monitor Output
  • Reference Current-Limit Protection (20mA, typ)
  • Voltage Clamp Protects Subsequent Output Circuitry
  • +2.7V to +22V Wide Voltage Range Operation
  • 6-Pin SOT23 Packages


  • Consumer Electronics
  • Current-to-Voltage Conversion
  • Laboratory Instrumentation
  • Level Translation
  • Medical Instrumentation
  • Photodiode Current-Monitoring Systems
  • Portable Instrumentation

See parametric specs for Fiber Photodiode Current Monitors (8)

Part NumberPhoto Diode Appl.IDIODEIDIODEVBIAS
Package/PinsOper. Temp.
minmaxminmaxtypto 10kHzSee Notes
MAX4004 PIN10nA (-113dBm)10mA (+7dBm)2.722409.2
-40 to +85$1.31 @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.

Tools & Models

  • MAX4004 Macromodel
  • Product Reliability Reports: MAX4004.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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    High-Speed Quad Driver with Integrated DACs, Cable-Droop Compensation, Slew-Rate Control, and VHH Fourth-Level Drive

  • Low Power at High-Speed Maximizes Driver Performance
    • 700mW per Channel
    • 2.57Gbps at +1V Programmed
    • 280ps Typical Rise/Fall Times at +2V (20% to 80%)
  • Integrated Functionality Provides Value-Added Features
    • Programmable Double Time Constant Cable-Droop Compensation
    • Digital Slew-Rate Control for EMI Sensitive Applications
    • Adjustable Output Resistance with 360mΩ Resolution

  • MAX40662
    Quad Transimpedance Amplifier with Input Current Clamp and Multiplexer for LiDAR

    • AEC-Q100
    • Enables ASIL Compliance (FMEDA Available Upon Request)
    • Internal Multiplexer

    Dual 280ps High-Speed Comparator, Ultra-Low Dispersion with LVDS Outputs

    • Fast Propagation Delay: 280ps, Typ
    • Low Overdrive Dispersion: 25ps (VOD = 10mV to 1V)
    • Supply Voltage 2.7V to 3.6V