I am aware of three companies manufacturing compatible motors. All appear to produce a good-quality product.
Switec was originally the technology arm of the Swiss watch company Swatch. The stepper business was sold off to Singapore-based Juken Technology in 2009. Switec motors are white, and have part numbers starting with “X”.
Hong Kong based VID also manufacture a range
of similar motors. Their motors are black, and have a black model number starting with “vid”.
Chinese company MCR Motor manufacture a range of compatible motors.
Their motors are white. with part numbers starting with “MR”.
X25 Product Numbers
Each manufacturer produces a number of variations of the motor.
|Switec||VID||MCR||Contacts||Mounting Pegs||Internal Stop||Shaft|
Other Switec Series
The X23 motors have an a hollow metal shaft encasing a transparent light guide to make it possible to have an illuminated pointer.
The X27 motors are a new line replacing the X25 series. The X27 part numbers mirror the X25 series.
X12 Motor Drivers
The X12 part numbers refer to a series of driver chips developed by Switec. I have not been able to locate a supplier of these chips since microcomponents.ch shut down.
I have not found any well-known online store supplying these parts. They are cheap and plentiful on ebay. However it can be difficult to determine exactly what you are getting; these motors are generally sold as Switec X25 replacements, without clearly specifying the manufacturer.