Dual/Quad, Unipolar/Bipolar, High-Voltage Digital Pulsers

Ideal for High-Voltage Applications Such As Portable Ultrasound Imaging and Industrial Flaw Detection

Please check latest availability status for a specific part variant.


The MAX4940/MAX4940A integrated circuits generate high-voltage, high-frequency, unipolar or bipolar pulses from low-voltage logic inputs. These quad/dual pulsers feature independent logic inputs, independent high-voltage pulser outputs with active clamps and independent high-voltage supply inputs.

The MAX4940/MAX4940A feature quad, high-voltage pulsers with 8.5Ω output impedance for the high-voltage outputs and a 21Ω impedance for the active clamp. The high-voltage outputs can provide 2.0A (typ) output current. All devices use two logic inputs per channel to control the positive and negative pulses. The MAX4940/MAX4940A have a dedicated input to control the active clamp. All devices feature an independent enable input EN. All digital inputs are CMOS compatible (see the Ordering Information/Selector Guide in the full data sheet).

The MAX4940/MAX4940A are available in a 56-pin, 8mm x 8mm, TQFN exposed pad package and are specified over the 0°C to +70°C commercial temperature range.

Warning: Exercise caution. The MAX4940/MAX4940A are designed to operate with high voltages.

Key Features

  • High-Density Quad-Channel Pulser in One Package
  • 0 to +220V Unipolar or ±110V Bipolar Outputs
  • 8.5Ω (typ) Output Impedance and 2.0A (typ) Output Current
  • 21Ω (typ) Always-On Active Clamp with Integrated Blocking Diodes
  • Integrated Output Diodes (MAX4940A Only)
  • No Special Power-Supply Sequencing Required for Trilevel Applications
  • Matched Rise/Fall Times and Matched Propagation Delays
  • CMOS-Compatible Logic Inputs
  • 56-Pin, 8mm x 8mm, TQFN Package


  • Cleaning Equipment
  • Flaw Detection
  • Piezoelectric Drivers
  • Test Instruments
  • Ultrasound Medical Imaging
Part NumberFunctionsChannelsVSUPPLY (Single)
VSUPPLY (Single)
minmaxSee Notes
MAX4940 Pulser42.3675
$26.18 @1k
See All Switches and Multiplexers (Mid and High Voltage) (299)
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.

MAX4940EVKIT: Evaluation Kit/Master Board for the MAX4940 and MAX4940A
MAX4940MB: Evaluation Kit/Master Board for the MAX4940 and MAX4940A
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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