A4988 Stepper Motor Driver Module for RepRap

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New Arrivals BreakoutModule MCU OtherMCU

Internal Reference: ACT-025

A4988 Stepper Motor Driver Module

Adjusting the stepper driver current
See these instructions: Pololu_stepper_driver_board#Tuning_motor_current.

  A4988 DRV8825
Max. theoretical current 1.5A 2.5A
Max. microsteps 16 32
PCB color Green / Red Purple
Stepper current adjust. trimpot Yes, near Dir pin Yes, near En pin
Typical Rs value 0.05 Ohm or
0.1 Ohm or
0.2 Ohm
0.1 Ohm
Vref formula (*) I_TripMax= Vref/(8*Rs) I_TripMax= Vref/(5*Rs)
Thermal Overload Protection (**) Yes Yes
PCB layers 2 4
Small heatsink included (***) Almost always Sometimes not
Active cooling required? Recommended Recommended
IC packaging 5x5mm 28-lead QFN 9.7x6.4mm 28HTSSOP


Specs for A4988 Stepper Motor Driver Module

The pdf file below contains the complete specifications for this driver module.

A4988-Datasheet

Packing list: 1 x stepper driver, 1 x heat sink