30A High-Current Dual-Channel Stepper Motor Driver Module – Onboard VNH2SP30 (Industrial-Grade)

SKU: FA2066-3
Motor Supply Voltage (VCC)

5.5V – 16V (Absolute max 41V)
Continuous Output Current (Per Channel)

30A (with adequate heatsinking)
Peak Output Current (Per Channel)

Limited by thermal protection
MOSFET On-Resistance (Per Leg)

19 mΩ (typical)
PWM Frequency Range

0 – 20 kHz
Logic Input Voltage (High/Low)

5V / 0V (5V logic compatible)
Standby Power Consumption

Very low (< 5µA typical)
Current Sense Output

Proportional to motor current
Diagnostic Output Type

Open-drain (requires pull-up resistor)
Thermal Shutdown Temperature

150°C (typical)
Operating Temperature Range

-40°C to +150°C
Number of Channels

2 (independent)
Mounting

Screw terminals / Header pins
Weight

Varies by board design

Product Overview

The 30A High-Current Dual-Channel Motor Driver Module represents the pinnacle of industrial-grade motor control, engineered for applications demanding extreme power and unwavering reliability. At its heart are two STMicroelectronics VNH2SP30 fully integrated H-bridge motor drivers—automotive-grade ICs originally designed for demanding environments like power windows, seat adjustment, and HVAC systems in vehicles .

This module delivers an exceptional 30A continuous current per channel (with appropriate heatsinking), making it one of the most powerful compact motor drivers available . Each VNH2SP30 IC integrates a dual monolithic high-side driver and two low-side switches using STMicroelectronics’ proprietary VIPower™ M0 and STripFET™ technologies, providing intelligent signal/protection circuitry alongside true power MOSFET performance .

Whether you are building heavy-duty industrial robots, electric vehicle prototypes, large-scale CNC machinery, automated guided vehicles (AGVs), or high-power aerospace actuators, this driver module delivers the muscle and robustness required for mission-critical applications. With comprehensive diagnostic capabilities, real-time current monitoring, and extensive protection features, it offers both raw power and intelligent control in a single, compact package.

Key Features

  • Dual Independent High-Current Channels: Features two fully independent VNH2SP30 H-bridge ICs, capable of driving two high-power brushed DC motors simultaneously or one massive bipolar stepper motor with exceptional torque .

  • 30A Continuous Current Capacity: Each channel delivers a remarkable 30A continuous output current (with proper heatsinking), with an absolute maximum rating of 41V and peak current handling suitable for the most demanding startup loads .

  • Automotive-Grade VNH2SP30 ICs: Utilizes genuine STMicroelectronics VNH2SP30 devices, designed and qualified for the harsh automotive environment (AEC-Q100 qualified), ensuring unparalleled reliability and longevity .

  • Ultra-Low On-Resistance: Features MOSFETs with typical on-resistance of just 19 mΩ per leg, minimizing power dissipation and maximizing efficiency even at full 30A load .

  • Integrated Current Sensing: Each channel provides a current sense output (CS) proportional to the motor current, allowing real-time monitoring of load conditions, torque control, and stall detection via microcontroller ADC inputs .

  • Comprehensive Diagnostic Feedback: Dedicated DIAG/EN pins provide open-drain bidirectional diagnostic signals, reporting fault conditions including overtemperature, overcurrent, undervoltage, and overvoltage events .

  • High-Frequency PWM Capability: Supports PWM operation up to 20 kHz, enabling smooth speed control across a wide range of motor types and applications .

  • Extensive Protection Features:

    • Thermal shutdown with automatic recovery

    • Undervoltage and overvoltage shutdown

    • Linear current limiter

    • Cross-conduction protection

    • Protection against loss of ground and loss of VCC

    • Overvoltage clamp

  • Very Low Standby Power Consumption: Consumes minimal power when idle, making it suitable for power-sensitive industrial applications .

  • Rugged Industrial Design: Built to withstand the rigors of industrial environments, with robust PCB construction and heavy-duty terminals suitable for high-current wiring.

Technical Specifications

Parameter Operating Value
Motor Supply Voltage (VCC) 5.5V – 16V (Absolute max 41V)
Continuous Output Current (Per Channel) 30A (with adequate heatsinking)
Peak Output Current (Per Channel) Limited by thermal protection
MOSFET On-Resistance (Per Leg) 19 mΩ (typical)
PWM Frequency Range 0 – 20 kHz
Logic Input Voltage (High/Low) 5V / 0V (5V logic compatible)
Standby Power Consumption Very low (< 5µA typical)
Current Sense Output Proportional to motor current
Diagnostic Output Type Open-drain (requires pull-up resistor)
Thermal Shutdown Temperature 150°C (typical)
Operating Temperature Range -40°C to +150°C
Number of Channels 2 (independent)
Mounting Screw terminals / Header pins
Weight Varies by board design

Pinout & Interface Guide (Per Channel)

Each VNH2SP30 IC provides a comprehensive set of control and monitoring pins. The module brings these out for easy access.

Power Terminals

  • VCC: Main motor power supply input (5.5V-16V). Connect to a high-current power supply capable of delivering 30A+ per channel. Use heavy-gauge wiring .

  • GND: Power ground. Must be connected to power supply negative terminal and shared with microcontroller ground.

Motor Outputs

  • OUTA / OUTB: The two output terminals for the H-bridge. Connect your DC motor here. Polarity determines initial rotation direction.

Control Pins

  • INA / INB: Direction control inputs. These pins directly interface with microcontroller GPIO to select motor direction and brake conditions .

  • PWM: Pulse Width Modulation input for speed control. A low level on this pin turns off both low-side switches; a high level turns them on according to INA/INB states . Maximum frequency: 20 kHz .

Diagnostic & Enable Pins

  • DIAGA/ENA and DIAGB/ENB: These are bidirectional open-drain pins with dual functions :

    • As an output (diagnostic): The IC pulls this pin low to indicate a fault condition (overtemperature, overcurrent, undervoltage, overvoltage).

    • As an input (enable): Pulling this pin low externally disables the corresponding half-bridge.

    • Requires an external pull-up resistor (typically 10kΩ) to 5V .

Monitoring Pins

  • CS (Current Sense): Provides an analog output proportional to the motor current. This pin delivers a current that is a fraction of the load current, which can be converted to a voltage via an external resistor for measurement by a microcontroller ADC .

Usage Guide

Important Pre-Operation Requirements

Power Supply Considerations:

  • This module requires a high-current power supply. For full 30A per channel operation, the power supply must be capable of delivering 60A+ total .

  • Use appropriately gauged wiring (minimum 10-12 AWG, preferably lower for longer runs) to handle the current without excessive voltage drop or heating.

  • The module operates from 5.5V to 16V (absolute maximum 41V, but operation above 16V requires careful thermal management and is not recommended for continuous use) .

Thermal Management:

  • At 30A continuous current, the VNH2SP30 ICs will generate significant heat. Adequate heatsinking is mandatory for sustained high-current operation .

  • The MultiPowerSO-30 package is designed for enhanced thermal performance via exposed die pads—ensure your module’s PCB design takes advantage of this with proper thermal vias and/or an attached heatsink .

  • For extreme high-demand applications, forced-air cooling (a fan) may be necessary .

Pull-Up Resistors:

  • The DIAG/EN pins are open-drain and must have external pull-up resistors (typically 10kΩ to 5V) for proper operation .

Control Logic Table

PWM Pin INA INB Motor Behavior
HIGH HIGH LOW Forward / Clockwise (Current OUTA → OUTB)
HIGH LOW HIGH Reverse / Counter-clockwise (Current OUTB → OUTA)
HIGH HIGH HIGH Brake (Fast motor stop via low-side shorts)
HIGH LOW LOW Brake (Fast motor stop via low-side shorts)
LOW X X Coast / Free-running (Outputs tri-stated, motor free-runs to stop)

Current Sensing Application

The CS pin provides real-time current feedback that can be used for:

  • Overcurrent Protection: Monitor current and shut down PWM or trigger enable pin if threshold exceeded.

  • Stall Detection: Detect motor stalls by monitoring sudden current spikes.

  • Torque Control: Implement closed-loop torque control by regulating current.

  • Load Monitoring: Track mechanical load variations in real-time.

Typical current sense circuit: Connect CS pin to microcontroller ADC through an appropriate resistor to convert output current to voltage. Refer to the VNH2SP30 datasheet for precise transfer characteristics (K factor) .

Diagnostic Monitoring

The DIAG/EN pins provide valuable fault information:

  • In normal operation, these pins remain high (due to pull-up resistors).

  • During a fault (thermal shutdown, overcurrent, etc.), the IC pulls the pin low.

  • The microcontroller can monitor this pin as an interrupt to trigger emergency shutdown or fault handling routines .

Typical Wiring Diagram (Arduino + Single High-Power Motor)

VNH2SP30 Module Connection / Component
VCC To +12V/24V of high-current power supply (through appropriate fuse/circuit breaker)
GND To GND of power supply AND to a GND pin on Arduino
INA Connect to Arduino digital pin 7 (through level shifter if needed)
INB Connect to Arduino digital pin 8 (through level shifter if needed)
PWM Connect to Arduino PWM pin ~9
DIAG/ENA Connect to Arduino digital pin 2 (interrupt-capable) with 10kΩ pull-up to 5V
CS Connect to Arduino analog pin A0 through current sense resistor circuit
OUTA, OUTB Connect to high-power DC motor (using heavy-gauge wire)
Q: What makes the VNH2SP30 different from standard motor driver ICs like the L298N?

The VNH2SP30 is in an entirely different class:

  • Current Capacity: L298N: 2A; VNH2SP30: 30A continuous

  • Technology: L298N uses bipolar transistors with ~2V drop; VNH2SP30 uses power MOSFETs with 19mΩ resistance for minimal losses

  • Origin: VNH2SP30 is automotive-grade (AEC-Q100 qualified), designed for the harsh automotive environment

  • Integration: VNH2SP30 integrates diagnostics and current sensing directly into the IC

Q: Can this module really handle 30A continuously?

Yes, the VNH2SP30 IC is rated for 30A continuous output current . However, this requires proper thermal management:

  • Adequate heatsinking attached to the IC’s thermal pad

  • Good airflow around the module

  • PCB design that facilitates heat dissipation

  • Operation within the specified voltage range

Without proper cooling, the thermal protection will activate, reducing or shutting down output.

Q: What types of motors can I control with this module?

This module is designed for:

  • High-power brushed DC motors (two) up to 30A each

  • Large bipolar stepper motors (one) using both channels

  • High-current inductive loads such as solenoids, valves, and actuators

It is not suitable for brushless DC motors (BLDC) without additional commutation control.

Q: What is the maximum voltage I can apply?

The VNH2SP30 has an absolute maximum rating of 41V . However, the recommended operating range for automotive applications is 5.5V to 16V . Operation above 16V is possible but requires careful thermal management and is not recommended for continuous duty without consulting the datasheet and adequate heatsinking.

Q: Can I use this module with 24V industrial systems?

The VNH2SP30 is optimized for 12V-16V automotive applications. While it can tolerate up to 41V, sustained 24V operation may push the IC beyond its optimal design parameters. For true 24V industrial applications, consider drivers specifically rated for 24V continuous operation.

Q: What power supply do I need for full 30A operation?

For dual-channel 30A operation (60A total):

  • Power supply rating: Minimum 12V-16V at 60A+ (720W+)

  • Wiring: Minimum 6-8 AWG wire for main power connections

  • Battery: Multiple high-discharge batteries in parallel (LiPo, LiFePO4, or lead-acid deep cycle) or an industrial-grade power supply

  • Protection: Heavy-duty fuses or circuit breakers (40-50A per channel, 70A+ main)

Q: What gauge wire should I use for 30A connections?

For 30A continuous current:

  • Power input and motor outputs: Minimum 10-12 AWG stranded copper wire (lower gauge for longer runs)

  • Keep power wires as short as possible to minimize voltage drop and electromagnetic interference

  • Signal wires (INA, INB, PWM, DIAG, CS): 22-24 AWG is sufficient

Q: Why do the DIAG/EN pins need pull-up resistors?

These pins are open-drain outputs, meaning they can only pull the line LOW, not drive it HIGH . An external pull-up resistor (typically 10kΩ to 5V) is required to maintain a HIGH signal during normal operation. When a fault occurs, the IC pulls this pin LOW, which can be detected by the microcontroller.

Q: What protection features does the VNH2SP30 include?

The VNH2SP30 includes comprehensive protection:

  • Thermal shutdown: Prevents damage from overheating (automatic recovery when temperature drops)

  • Undervoltage shutdown: Prevents operation at unsafe low voltages

  • Overvoltage shutdown/clamp: Protects against supply voltage spikes

  • Linear current limiter: Limits current during overload conditions

  • Cross-conduction protection: Prevents shoot-through current

  • Loss of ground/VCC protection: Maintains safe state if ground or supply is lost

Q: How do I use the diagnostic feature?

Connect the DIAG/EN pin to a microcontroller input with an external pull-up resistor to 5V. In your code, monitor this pin:

  • If HIGH: Normal operation

  • If LOW: A fault has occurred (check which fault by reading other status registers if available, or by process of elimination)

You can also use this pin as an interrupt to trigger immediate shutdown routines

Q: How accurate is the current sensing?

The CS pin provides a current proportional to the motor current . The exact transfer ratio (K factor) is specified in the VNH2SP30 datasheet. This output is suitable for:

  • Monitoring relative load changes

  • Detecting stalls (sudden current increase)

  • Implementing basic current limiting

  • Closed-loop torque control

For precision current measurement, calibration against a known reference is recommended.

Q: The module gets extremely hot. Is this normal?

At 30A continuous current, each channel dissipates significant power (P = I²R). With 19mΩ resistance, power loss ≈ I² × 0.019 = 17 watts per channel at 30A . This heat must be dissipated. The IC will become hot (60-80°C) under full load. If it becomes too hot to touch (>70°C) and thermal shutdown activates, you need:

  • Better heatsinking

  • Forced-air cooling (fan)

  • Reduced duty cycle or current

Q: The motor runs weakly or stalls under load. What's wrong?

Check:

  1. Power supply voltage sag: Measure VCC under load; it should remain above minimum operating voltage

  2. Power supply current capability: Ensure supply can deliver required current

  3. Wiring voltage drop: Thicker wires needed for 30A

  4. Thermal shutdown: If module is hot, it may be cycling in and out of thermal protection

  5. PWM frequency: Ensure it’s within 20kHz limit

Q: The motor runs in only one direction.

Verify:

  • INA and INB are receiving opposite logic states (HIGH/LOW or LOW/HIGH)

  • Both control signals are reaching the pins (check wiring)

  • The module isn’t in brake mode (both INA and INB same state)

  • The DIAG/EN pin is HIGH (enabled) and not indicating a fault

Q: Can I parallel both channels to drive a single higher-current motor?

Not recommended. Paralleling H-bridge outputs can cause cross-conduction, shoot-through currents, and module destruction unless the design specifically supports it. This module is designed for independent channel operation.

Q: What happens if I exceed 41V?

Exceeding the absolute maximum voltage of 41V will likely destroy the VNH2SP30 ICs immediately . Always ensure your power supply is regulated and within specifications, with appropriate transient protection.

Q: Is this module suitable for an electric vehicle conversion?

For 12V-16V auxiliary motors (power steering pumps, cooling fans, etc.), yes. For main traction motors, most EVs use higher voltages (48V-400V) and brushless motors requiring different controller types. This module is ideal for high-power 12V auxiliary systems.

Q: Can I use this for a large CNC spindle motor?

For brushed DC spindle motors within the voltage and current ratings, yes. The 20kHz PWM frequency  and current sensing make it suitable for speed and torque control. For brushless spindles, a dedicated VFD or BLDC controller is required.

Q: Is this suitable for industrial automation (PLCs, factory equipment)?

Yes. The automotive-grade construction, comprehensive protection features, and diagnostic capabilities make it excellent for industrial applications. The 5V logic compatibility allows direct interface with industrial controllers

Q: Can I use the current sense for closed-loop speed control?

Yes. By monitoring the CS pin, you can implement:

  • Torque control (constant current)

  • Current limiting (reduce PWM if current exceeds threshold)

  • Stall detection and recovery

  • Load monitoring and adaptive control

For true closed-loop speed control, you would also need encoder or tachometer feedback.

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