1. Products
  2. Switches and Multiplexers
  3. Relay Drivers
  4. MAX4820


Features and Benefits

  • 8 Independent Output Channels
  • Built-In Inductive Kickback Protection
  • Drive +3V and +5V Relays
  • Guaranteed 70mA (min) Coil Drive Current
  • Active-Low SET Function to Turn On All Outputs Simultaneously
  • Active-Low RESET Function to Turn Off All Outputs Simultaneously
  • SPI-/QSPI-/MICROWIRE-Compatible Serial Interface (MAX4820)
  • Serial Digital Output for Daisy Chaining (MAX4820)
  • Parallel Interface (MAX4821)
  • Low 50µA (max) Quiescent Supply Current
  • Space-Saving 20-Pin Thin QFN Package

Product Details

The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3.3V/+5V nonlatching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each independent open-drain output features a 2Ω on-resistance and is guaranteed to sink 70mA (min) of load current. Both devices consume less than 50µA (max) quiescent current and have 1µA output off-leakage current.

The MAX4820 features an SPI™-/QSPI™-/MICROWIRE™-compatible serial interface. Input data is shifted into an 8-bit shift register and latched to the outputs when active-low CS transitions from low to high. Each data bit in the shift register corresponds to a specific output, allowing independent control of all outputs.

The MAX4821 features a 4-bit (A0, A1, A2, LVL) parallel-input interface. The first three bits (A0, A1, A2) determine the output address, and the fourth bit (LVL) determines whether the selected output is switched on or off. Data is latched to the outputs when active-low CS transitions from low to high.

Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simultaneously with a single control line. Built-in hysteresis (Schmidt trigger) on all digital inputs allows these devices to be used with slow rising and falling signals, such as those from optocouplers or RC power-up initialization circuits. The MAX4820/MAX4821 are available in 20-pin TSSOP and space-saving 20-pin thin QFN packages.


  • Automated Test Equipment (ATE)
  • Central Office
  • DSL, ADSL Line Cards
  • E1/T1 Redundancy
  • Industrial Equipment

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

IBIS Model

Design Resources

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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX4820ETP+ Material Declaration Reliability Data 20-LFCSP-4X4X0.75
MAX4820ETP+T Material Declaration Reliability Data 20-LFCSP-4X4X0.75
MAX4820EUP+ Material Declaration Reliability Data 20-TSSOP_4.4_EP-4.4_MM
MAX4820EUP+T Material Declaration Reliability Data 20-TSSOP_4.4_EP-4.4_MM
Wafer Fabrication Data MAX4820 Reliability Data

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