This part is a kind of semiconductor called M28N-1.
Function of this product has DC Mini-Motors.
Manufacturers : Mitsumi Electronics
Image and pinout :
Some of the text within the PDF file :
MITSUMI DC Mini-Motors M28N-1 Series DC Mini-Motors Applications 1. Printer 2. Power assistance SPECIFICATIONS SPEC-NO Items Rated Voltage (V) Voltage Range (V) Rated Load (mN·m) No Load Speed (rpm) No Load Current (mA) Starting Torque (mN·m) Rotation R-147381 24.2 3.0~30.0 9.8 7200 70 51 CW/CCW *Encoders available as options. CHARACTERISTICS 10000 8000 Speed (rpm) M28N-1 Series (R-147381) 2.5 2 6000 4000 2000 0 0 da t2 4.2 V C at ent urr 24. 2V 1.5 1 0.5 10 20 30 Torque (mN·m) 40 50 DIMENSIONS Current (A) Sp ee Unit : mm [ ... ]