Motor type supported
Key selection specSource: general guidance
Brushed DC, stepper, BLDC with halls
DC H-bridge ≠ stepper driver ≠ BLDC smart drive.
Wrong driver class will not work or will smoke.
Motor drivers
Boards and modules that switch current to DC, stepper, and sometimes servo rails — bridging low-power controller GPIO to motors.
COMPONENTS DIRECTORY//PART::MOTOR-DRIVERS
Qualitative pricing onlyWidely availableProcurement: LowOvernight availability: needs live supplier verificationSource: Partially verified
Motor drivers category hero
Verified media required — not AI product evidence. Photo Archivist / official sources only.
Placeholder — final asset pendingAn electronic module that amplifies logic-level direction/PWM signals into bidirectional current for motors.
Your controller tells the driver which way and how fast; the driver handles the heavy current the motor needs.
H-bridges switch polarity for direction; PWM controls average voltage. Stepper drivers chop windings for microstepping. Thermal resistance and RDS(on) define continuous current without shutdown.
Drives DC brushed motors, steppers, or (on dedicated modules) provides appropriate interfaces for motor classes the MCU cannot power directly.
- →Dual H-bridge for two wheel motors
- →Stepper driver for gantry axes
- →High-current driver for shooter wheels
- •Differential-drive mobile robots
- •Competition drivetrains
- •Conveyor and intake mechanisms
- •Linear actuators with DC motors
- •3D printer and CNC-derived gantry bots
Qualitative spec selection guide — not live product values. Verify exact numbers on the manufacturer datasheet before ordering.
SKU-level comparison is not available yet — use this table to decide what to verify before ordering.
11 selection specs · 7 key for buying decisions
| Spec | Why it matters | Buyer warning |
|---|---|---|
Motor type supported Key selection spec Brushed DC, stepper, BLDC with halls | DC H-bridge ≠ stepper driver ≠ BLDC smart drive. | Wrong driver class will not work or will smoke. |
Voltage range V Key selection spec 4.5–24 V hobby; up to 48 V industrial | Must cover battery sag under load. | Undervoltage lockout stops robot mid-run. |
Continuous current A Key selection spec | Thermal limit at duty cycle — not peak only. Beginner: If the robot pushes at half throttle for minutes, that's continuous — not peak. | Size for continuous, not 1 ms stall only. |
Peak current A Key selection spec | Startup and stall bursts. | Peak rating without heat sink misleads. |
Channels Key selection spec | Dual H-bridge drives two motors. | Count channels vs motors on drivetrain. |
Control interface Key selection spec PWM+DIR, STEP/DIR, CAN | Must match controller GPIO or bus. | STEP/DIR wiring differs from PWM direction. |
Thermal protection Optional detail | Shutdown saves module but stops robot. | Repeated thermal trips indicate undersizing. |
Current sensing Optional detail | Stall detection and traction control. | Not all hobby modules expose sense pins. |
Braking support Optional detail | Coast vs brake affects holding on slopes. | Regenerative behavior varies by driver. |
Cooling requirement Key selection spec | Heat sink and airflow for rated amps. | L298N at high current without sink fails silently. |
Protection features Optional detail | Reverse battery, over-current, shoot-through. | Unprotected modules fail from wiring mistakes. |
Voltage range
V
Key selection specSource: general guidance
4.5–24 V hobby; up to 48 V industrial
Must cover battery sag under load.
Undervoltage lockout stops robot mid-run.
Continuous current
A
Key selection specSource: general guidance
Thermal limit at duty cycle — not peak only.
Size for continuous, not 1 ms stall only.
Beginner: If the robot pushes at half throttle for minutes, that's continuous — not peak.
Peak current
A
Key selection specSource: general guidance
Startup and stall bursts.
Peak rating without heat sink misleads.
Channels
Key selection specSource: general guidance
Dual H-bridge drives two motors.
Count channels vs motors on drivetrain.
Control interface
Key selection specSource: general guidance
PWM+DIR, STEP/DIR, CAN
Must match controller GPIO or bus.
STEP/DIR wiring differs from PWM direction.
Thermal protection
Optional detailSource: general guidance
Shutdown saves module but stops robot.
Repeated thermal trips indicate undersizing.
Current sensing
Optional detailSource: general guidance
Stall detection and traction control.
Not all hobby modules expose sense pins.
Braking support
Optional detailSource: general guidance
Coast vs brake affects holding on slopes.
Regenerative behavior varies by driver.
Cooling requirement
Key selection specSource: general guidance
Heat sink and airflow for rated amps.
L298N at high current without sink fails silently.
Protection features
Optional detailSource: general guidance
Reverse battery, over-current, shoot-through.
Unprotected modules fail from wiring mistakes.
Additional key specs (seed data)
Continuous vs peak current
Per channel, heat-sink dependent
Stall current exceeds continuous — sizing margin required.
Supply voltage range
Must cover battery sag
Undervoltage lockout stops robot mid-run.
Logic voltage
3.3 V / 5 V compatible inputs
ESP32 3.3 V vs Arduino 5 V logic.
PWM frequency support
Audible vs ultrasonic PWM
Whining motors and heating at wrong frequency.
Current sensing
Optional ADC feedback
Stall detection and traction control.
Protection
Reverse battery, thermal, over-current
Field repairability on competition bots.
- Motor stall current vs driver continuous rating
- Heat sinking and airflow
- Brake/coast modes
- Stepper microstepping if applicable
Prices vary by model, supplier, quantity, availability, and shipping speed. EAR pricing bands are guidance only unless tied to a sourced product record. Verify current pricing before ordering.
Prices vary by model, supplier, quantity, availability, and shipping speed. EAR pricing bands are guidance only unless tied to a sourced product record. Verify current pricing before ordering.
Small DC motor drivers
small_dc
Qualitative guidance onlyNeeds review
Low-current H-bridge and driver modules cover small gearmotors and toy-class loads. Cost is modest but failure modes come from voltage and current mis-match, not driver headline price.
Typical buyer
Small rovers, line followers, lightweight mechanisms.
Examples
Dual H-bridge modules, small motor shield channels, low-A driver boards.
What affects cost
- →Continuous vs peak current rating
- →Single vs dual channel
- →Logic level and PWM interface
- →Brand vs generic module
Price usually excludes
power supplycontroller/drivercables/connectorsmounting hardwareshippingtaxes/tariffssoftware/licenseintegration timesupport/warranty plan
Buyer caution
Peak current on datasheets is not continuous duty. Verify heat sinking and motor stall current before ordering the cheapest module.
Source basis
Category-level qualitative guidance — no SKU-linked distributor band yet.
Open research gaps
- Sourced USD band — small DC motor driver modules — No sourced numeric band in EAR. Next: Distributor listing spot-check (Digi-Key, Mouser, Pololu, OEM)
Verify current pricing with supplier before ordering.
High-current DC motor drivers
high_current_dc
Qualitative guidance onlyNeeds review
High-current bridges and smart drivers jump in cost with MOSFET quality, thermal design, and current sensing. Robotics platforms with larger gearmotors land here.
Typical buyer
Heavy rovers, load-bearing drivetrains, competition robots.
Examples
RoboClaw-class smart drivers, high-A dual bridges, VNH-style modules.
What affects cost
- →Continuous current and voltage ceiling
- →Encoder/feedback inputs and closed-loop features
- →Heat dissipation and enclosure
- →Smart driver firmware vs bare H-bridge
Price usually excludes
power supplycontroller/drivercables/connectorsmounting hardwareshippingtaxes/tariffssoftware/licenseintegration timesupport/warranty plan
Buyer caution
Undersized drivers fail silently under thermal foldback. Price the driver for continuous stall scenarios or add current limits in software.
Source basis
Category-level qualitative guidance — no SKU-linked distributor band yet.
Open research gaps
- Sourced USD band — high-current DC motor drivers — No sourced numeric band in EAR. Next: Distributor listing spot-check (Digi-Key, Mouser, Pololu, OEM)
Verify current pricing with supplier before ordering.
Stepper motor drivers
stepper
Qualitative guidance onlyNeeds review
Stepper drivers range from bare IC breakout to integrated TMC-class boards with microstepping. Cost scales with current, silent drive features, and channel count.
Typical buyer
CNC-adjacent robots, gantry arms, 3D-printer-derived motion stacks.
Examples
A4988/DRV8825-class modules, TMC2209 silent drivers, multi-axis boards.
What affects cost
- →Peak/current rating and microstepping
- →Silent/StealthChop-class features
- →Standalone vs SPI/UART configurability
- →Quantity (Prusa-style bulk vs single replacement)
Price usually excludes
power supplycontroller/drivercables/connectorsmounting hardwareshippingtaxes/tariffssoftware/licenseintegration timesupport/warranty plan
Buyer caution
Stepper driver voltage and current must match motor coil specs. Wrong microstep config causes vibration — not a reason to swap driver brands blindly.
Source basis
Category-level qualitative guidance — no SKU-linked distributor band yet.
Open research gaps
- Sourced USD band — stepper driver modules by current tier — No sourced numeric band in EAR. Next: Distributor listing spot-check (Digi-Key, Mouser, Pololu, OEM)
Verify current pricing with supplier before ordering.
Brushless motor controllers
bldc
Qualitative guidance onlyNeeds review
BLDC ESCs and field-oriented control boards vary with peak amp rating, sensorless vs sensored, and protocol (PWM, CAN, drone-style). Drone ESC pricing is not industrial servo-drive pricing.
Typical buyer
Drones, high-RPM drivetrains, propulsion, some joint actuators.
Examples
Multirotor ESCs, sensored BLDC controllers, VESC-class boards.
What affects cost
- →Peak and continuous amp rating
- →Sensored vs sensorless, CAN vs PWM
- →Firmware features and telemetry
- →Aviation vs ground robotics duty cycle
Price usually excludes
power supplycontroller/drivercables/connectorsmounting hardwareshippingtaxes/tariffssoftware/licenseintegration timesupport/warranty plan
Buyer caution
Drone ESCs may lack holding torque features needed for ground robotics joints. Verify braking, direction, and feedback before substituting.
Source basis
Category-level qualitative guidance — no SKU-linked distributor band yet.
Open research gaps
- Sourced USD band — BLDC controllers by amp tier — No sourced numeric band in EAR. Next: Distributor listing spot-check (Digi-Key, Mouser, Pololu, OEM)
Verify current pricing with supplier before ordering.
Industrial drives
industrial
Qualitative guidance onlyNeeds review
Industrial VFDs and servo drives are quoted with motor pairing, fieldbus, and safety options. EAR requires sourced records before publishing numeric bands.
Typical buyer
Machine builders, factory automation, AMR OEM drivetrains.
Examples
Servo drives, VFDs, integrated drive+motor packages.
What affects cost
- →Power kW rating and regen/braking options
- →Fieldbus and safety STO features
- →Authorized channel vs gray market
- →Spares vs current product line
Price usually excludes
power supplycontroller/drivercables/connectorsmounting hardwareshippingtaxes/tariffssoftware/licenseintegration timesupport/warranty planmotor pairing engineeringfieldbus modulescommissioning
Buyer caution
Industrial drives are not interchangeable with hobby ESCs. Firmware, motor constants, and safety certification must match the application.
Source basis
Category-level qualitative guidance — no OEM or distributor band verified in EAR.
Open research gaps
- Sourced USD band — entry industrial servo/VFD drives — No sourced numeric band in EAR. Next: Distributor listing spot-check (Digi-Key, Mouser, Pololu, OEM)
Verify current pricing with supplier before ordering.
Representative product records for orientation — not endorsements.
EAR compatibility guidance is category-level unless a specific product record is sourced. Always verify voltage, current, connectors, signal type, documentation, and manufacturer limits before ordering.
EAR compatibility guidance is category-level unless a specific product record is sourced. Always verify voltage, current, connectors, signal type, documentation, and manufacturer limits before ordering.
General guidanceConfidence: mediumSource: partially verified
Build chains
DC motor chain
- →Controller boards cannot drive most motors directly.
- →Motor driver must match motor voltage and current.
- →Stall current matters.
- →Heat dissipation matters.
- →Direction/speed control depends on driver.
Stepper motor chain
- →Stepper drivers must match motor current and voltage needs.
- →Current setting is critical.
- →Drivers can overheat.
- →Microstepping affects smoothness and torque.
Works with
Required companion parts
- →Controller board (PWM/direction, STEP/DIR, or CAN commands)
- →DC or stepper motor matched to driver class
- →Battery or power supply within driver VIN range
- →Proper gauge wire and shared ground with controller
Optional companion parts
- →Bulk capacitors near driver terminals
- →Heat sink or airflow for continuous current
- →Fuse or protection on battery feed
- →Wheel encoders for closed-loop on same MCU
Common interfaces
Dual inline headersScrew terminalsSTEP/DIR inputsJST high-current
Sign-magnitude PWM + directionSTEP/DIR stepperCAN on smart industrial drives
Voltage / current / power
- →Driver VIN must cover battery sag under load
- →Logic voltage (3.3 V vs 5 V) must match controller outputs
- →Stepper drivers must match motor coil voltage/current ratings
- →Size for continuous current at duty cycle — stall exceeds continuous briefly
- →Stepper current setting is critical — too high overheats motor and driver
- →Heat dissipation limits practical continuous amps
- →Controller boards cannot drive most motors directly
- →Motor driver must match motor voltage and current
- →Add bulk cap on long power leads to reduce sag and noise
Software & controller
- →PWM frequency affects audible whine and heating on DC drivers
- →Microstepping settings affect smoothness and torque on steppers
- →Direction/speed control depends on driver interface type
Mechanical
- →Driver module heat sinking and mounting airflow
- →Wire gauge and terminal torque for high-current paths
Buyer mismatch warnings
- Using DC H-bridge for stepper motors without correct wiring
- Undersized driver vs motor stall current
- Using motor drivers with hobby servos (wrong category entirely)
- Missing shared ground between controller and driver
- L298N-class modules at high current without adequate heat sink
Emergency substitution notes
- →Substitute driver must meet or exceed continuous current at your duty cycle
- →Confirm logic voltage compatibility with ESP32/Arduino before leaving store
Open research gaps
- BLDC smart driver pairing maps · Category guidance only
Product-specific compatibility still needs verification.
Full cross-component view: Compatibility overview
EAR does not currently verify live stock or delivery speed. Use this guide to avoid ordering the wrong part, then verify stock, shipping, compatibility, and datasheets with the supplier before purchase.
EAR does not currently verify live stock or delivery speed. Use this guide to avoid ordering the wrong part, then verify stock, shipping, compatibility, and datasheets with the supplier before purchase.
Guide: general guidanceNeeds live supplier check
Urgency summary
Motor drivers fail emergencies when stall current, motor type, voltage range, or heat sinking are guessed instead of verified.
Check stock and shipping live before ordering.
Urgent questions
- →Is the motor DC, stepper, brushless, or servo?
- →What voltage does the motor use?
- →What continuous current and stall/peak current are needed?
- →How many channels?
- →What control signal does the controller board provide?
- →Is heat sinking/cooling required?
- →Is braking/reverse needed?
Non-negotiable specs
- →Motor type (DC brushed, stepper, brushless, or integrated servo)
- →Voltage range covering battery sag
- →Continuous current at expected duty cycle
- →Peak / stall current headroom
- →Channel count vs motor count
- →Control interface (PWM+DIR, STEP/DIR, CAN, etc.)
- →Heat sinking / cooling for rated current
- →Protection features (reverse battery, over-current, thermal shutdown)
Acceptable substitutions (category-level)
- →Driver rated higher continuous current with adequate heat sink
- →Modern module vs legacy chip if current and interface match
Dangerous substitutions
- Current rating below stall current
- Wrong motor type (DC H-bridge for stepper incorrectly wired)
- Wrong voltage range
- No heat sinking for high loads
- No flyback/protection where needed
- Assuming a microcontroller can drive a motor directly
Suppliers to check first
Digi-Key · supplier targetMouser Electronics · supplier targetPololu · supplier targetRobotShop · supplier targetAutomationDirect · supplier targetAmazon · marketplace caution
Full supplier directory →Local pickup targets (verify stock)
- →Micro Center — limited driver modules; verify online
Marketplace cautions
- →Amazon: verify continuous vs peak current claims on listings
- →Counterfeit driver ICs on ultra-cheap modules
Before you order
- →Measure or read datasheet stall current
- →Confirm logic voltage with ESP32/Arduino
- →Add bulk capacitor if long battery leads
- →Plan heat sink/airflow for continuous duty
After arrival — bench test
- →Bench-test no-load direction reversal
- →Feel driver temperature at expected duty cycle
- →Verify no MCU reset when motor stalls
If you get it wrong
- →Thermal shutdown mid-run
- →Smoke from wiring or shoot-through error
- →Robot cannot climb ramp due to current limit
Open research gaps
- Competition-legal driver list · Partial
Match driver to motor class: DC brushed H-bridge, stepper A4988/TMC22xx class, smart drivers for BLDC with hall sensors. Servo PWM is not the same as DC motor drive.
EAR does not currently show live inventory. Always verify stock, shipping speed, compatibility, and authorized-channel status before ordering.
EAR does not currently show live inventory. Always verify stock, shipping speed, compatibility, and authorized-channel status before ordering.
Best sources to check first for motor drivers
Module vendors document Arduino wiring clearly. Industrial drives from AutomationDirect need compatibility verification. Size current before ordering.
Check first
- •Pololu
- •SparkFun
- •Adafruit
- •AndyMark
- •REV Robotics
Also check
- •Digi-Key
- •Mouser Electronics
- •AutomationDirect
- •Jameco
Use with caution
- •Amazon
- •AliExpress
- •eBay
Pololu
SupplierRobotics specialistU.S. shipping: typically availableOvernight: shipping needs live checkAuthorized status unknown
Supported categories
servosmotor driverscontroller boardskitsmechanical
Likely category source for hobby servos and motor driver modules
Buyer caution
Not industrial OEM authorized distributor
Supplier target
Verify stock and shipping before ordering.
SparkFun
SupplierHobby supplierU.S. shipping: typically availableOvernight: shipping needs live checkAuthorized status unknown
Supported categories
controller boardsmotor driversservossensorskits
Curated edu/hobby boards with tutorials
Buyer caution
Not an industrial authorized distributor for OEM lines
Supplier target
Verify stock and shipping before ordering.
Adafruit
SupplierHobby supplierU.S. shipping: typically availableOvernight: shipping needs live checkAuthorized status unknown
Supported categories
controller boardsmotor driversservossensorspower
Well-documented boards and drivers
Buyer caution
Not suited for heavy industrial actuators
Supplier target
Verify stock and shipping before ordering.
AndyMark
SupplierEducation / competitionU.S. shipping: typically availableOvernight: shipping needs live checkAuthorized status unknown
Supported categories
motor driversmechanicalkits
Likely category source for competition motor controllers and drivetrain
Buyer caution
Limited general-purpose controller boards
Competition drivetrain
Verify stock and shipping before ordering.
REV Robotics
SupplierEducation / competitionU.S. shipping: typically availableOvernight: shipping needs live checkAuthorized: partial — verify by manufacturer
Supported categories
controller boardsmotor driversservoskits
Competition-legal controllers and motor controllers
Buyer caution
Ecosystem locked to competition rules — not general-purpose only
Competition legal SKUs
Verify stock and shipping before ordering.
Digi-Key
SupplierAuthorized distributorU.S. shipping: typically availableOvernight: varies by itemAuthorized: partial — verify by manufacturer
Supported categories
controller boardsmotor driversservosactuatorspowerconnectorssensorslidarcamerasimus
Broad authorized catalog for semiconductors and modules
Buyer caution
Not optimized for hobby servo bundles — check robotics specialists first
Shipping verification needed
Verify stock and shipping before ordering.
Mouser Electronics
SupplierAuthorized distributorU.S. shipping: typically availableOvernight: varies by itemAuthorized: partial — verify by manufacturer
Supported categories
controller boardsmotor driversservosactuatorspowerconnectorssensorslidarcamerasimus
Wide semiconductor and module selection
Buyer caution
Less hobby-robotics curated than Pololu or ServoCity
Shipping verification needed
Verify stock and shipping before ordering.
Browse all suppliers in the Supplier Directory. See what works together in the Compatibility Matrix.
Overnight availability needs live supplier verification. EAR does not track live inventory.
STOCK & SHIPPING
Overnight availability: needs live supplier verification. EAR does not track live inventory.
For rush-order decision checklists, see Emergency sourcing guide above.
Likely supplier targets to check first
See Who sells it above for supplier targets and sourcing guidance — then verify stock and shipping live before ordering.
Emergency sourcing checklist
- □Measure motor stall current with multimeter / datasheet
- □Match battery voltage to driver range
- □Add bulk cap if long power leads
- □Confirm logic voltage compatibility with ESP32/Arduino
Thermal shutdown mid-run
- ×Thermal shutdown mid-run
- ×Shoot-through or latch-up from wiring errors
- ×Ground bounce causing MCU resets
- ×Reverse battery damage on unprotected modules
Replacement parts risk
Keep spare driver modules — competition timelines cannot wait for slow shipping.
Size for continuous current at expected duty cycle, not just stall for a millisecond. Heat kills drivers silently.
Size for continuous current at expected duty cycle, not just stall for a millisecond. Heat kills drivers silently.
- !L298N-class ancient drivers for high-current modern bots without heat sink
- !Undersized gauge wire on high-current paths
- !Driving steppers with DC H-bridges incorrectly wired
- Integrated smart motor with onboard driver
- Industrial VFD for AC motors
OPEN RESEARCH GAPSDriver taxonomy seeded — industrial drive pricing pending
pricing
Driver module USD bands
CURRENT STATUS
Needs sourced range
NEXT EVIDENCE TARGET
Pololu / Digi-Key reference SKUs