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High-Power Discrete MOSFET H-Bridge 18v25

High-Power Discrete MOSFET H-Bridge 18v25

The Pololu high-power motor driver is a discrete MOSFET H-bridge designed to drive large DC brushed motors. The H-bridge is made up of two N-channel MOSFET per leg, and most of the board’s performance is determined by these MOSFETs (the rest of the board contains the circuitry to take user inputs and control the MOSFETs). The MOSFET datasheet is available under the “Resources” tab. The MOSFETs have an absolute maximum voltage rating of 30 V, and higher voltages can permanently destroy the motor driver. Under normal operating conditions, ripple voltage on the supply line can raise the maximum voltage to more than the average or intended voltage, so a safe maximum voltage is approximately 24 V. (Please note that this driver is not appropriate for 24 V battery banks as they can be significantly higher than their nominal voltage when fully charged.)

The versatility of this driver makes it suitable for a large range of currents and voltages: it can deliver up to 25 A of continuous current with a board size of only 1.8" by 0.8" and no required heat sink. With the addition of a heat sink, it can drive a motor with up to 40 A of continuous current. The module offers a simple interface that requires as little as two I/O lines while allowing for both sign-magnitude and locked-antiphase operation. Integrated detection of various short-circuit conditions protects against common causes of catastrophic failure; however, please note that the board does not include reverse power protection or any over-current or over-temperature protection.

There are 6 versions of the high-power motor driver, each with a different operating voltage and current range. The 6 drivers have two different sizes and are all pin-compatible with one another.

General specifications

  • Motor channels: 1
  • Minimum operating voltage: 5.5 V
  • Maximum operating voltage: 30 V
  • Continuous output current per channel: 25 A
  • Peak output current per channel: 250 A
  • Maximum PWM frequency: 40 kHz
  • Maximum logic voltage: 5.5 V
  • Reverse voltage protection?: N


Size: 1.8" x 0.8"

Weight: 4.2 g

Warning: This motor driver has no over-current or over-temperature shut-off. Either condition can cause permanent damage to the motor driver.



SKU: POL-758

1 available

Qty. Price
(AUD ex. GST)
1 to 4 $62.30
5 to 9 $59.18 (5% off)
10+ $56.06 (10% off)