This part is a kind of semiconductor called M42SP-4NK.

Function of this product has Stepping Motors.

Manufacturers : Mitsumishi

Image and pinout :

Some of the text within the PDF file :

MITSUMI Stepping Motors M42SP-4, -4NK Stepping Motors OUTLINE A high-resolution model "M42SP-4" "M42SP4NK" which is the only motor that has 3.75˚step angle among the stepping motor series. Despite the modest body size (o.d. : 42mm, thickness : 15.7/17.9mm) this motor has high output characteristic, excellent running quietness and stability. FEATURES 1. High output torque, and high resolution. 2. Superior running quietness and stability. 3. Step angle : 3.75˚. 4. Excellent responsiveness acquired. USES Printers, word processors, facsimiles, and such. MITSUMI Stepping Motors SPECIFICATIONS tems Rated Voltage Working Voltage Rated Current/Phase No. of Phase Coil DC Resistance Step Angle Excitation Method Insulation Class Holding Torque Pull-o [ ... ]

M42SP-4NK PDF Datasheet Download