Stepper Driver Specs: 2M415

Collected from various spots around the Web, including evanescent eBay listings, and reformatted to make sense, these specs describe the 2M415 stepper driver: a smaller sibling of the 2M542 family.


  • +15 to 40VDC Supply Voltage
  • H-Bridge, 2 Phase Bi-polar Micro-stepping Drive
  • Suitable for 2-phase, 4, 6 and 8 leads step motors, with Nema size 16 to 23
  • Output current selectable from 0.21 ~ 1.5A peak
  • Compact credit card size package
  • Optically isolated single ended TTL inputs for Pulse, Direction and Enable signal inputs
  • Selectable resolutions up to 12800 steps
  • Over Voltage, Coil to Coil and Coil to Ground short circuit protection.

Electrical specs

Parameters Min Typ Max Unit
Output Current (Peak) 0.21 1.5 Amp
Supply voltage 15 36 40 VDC
Logic Input Current 7 10 16 mA
Pulse input frequency 0 200 KHz
Low Level Time 2.5 µsec

Mechanical specs

Cooling Natural Cooling or Forced Convection
Space Avoid dust, oil, frost and corrosive gases
Ambient Temp 0 °C – 50 °C
Humidity 40 – 80 %RH
Vibration 5.9 m/s² Max
Storage Temp. -10 °C – 80 °C
Weight Approx. 150 gram


2M415 Footprint
2M415 Footprint

Wiring diagram

2M415 Wiring
2M415 Wiring

Notice that the driver requires a positive voltage for the optoisolators.

Of course, the box from halfway around the planet contained HB-415M drivers. Should you go looking with the usual keywords, you’ll find that HB-number turns up mostly “House Bill number” citations from various state legislatures. Popping the top off the drive reveals, which eventually produces a description and PDF datasheet for the driver. It turns out to be an “Ultra Low Noise” driver, whatever that means, with reasonably standard specifications that correspond more-or-less to the 2M415 drivers I thought I was getting.

8 thoughts on “Stepper Driver Specs: 2M415

  1. By low noise, they mean low audible noise since it switches at ultrasonic frequencies. I find that completely untrue as mine make an audible hiss in the motors but I just need a few more years of hearing loss and then I won’t know about it. YMMV.

    1. since it switches at ultrasonic frequencies

      Or maybe they have a capacitor on the input that’s supposed to filter out the electrical noise? Sort of like a blender with “Solid State Speed Control” that turns out to have a (one, singular) diode rectifying the power-line input for the half-speed setting. Ya never know!

      mine make an audible hiss in the motors

      Without changing a thing, the Sherline’s motors have gotten quieter and quieter over the years. They still drive Mary out of the Basement Laboratory, though.

  2. motors have gotten quieter

    Yeah, happened to me, too. Chainsaws used to be way too loud, but over the years (and too much reconstructive ear surgery for otosclerosis) my hearing is charitably described as “low normal”. On a good day.

    1. hearing is charitably described as “low normal”

      I’m beginning to suspect that might apply to more than just my ears… [grin]

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