This part is a kind of semiconductor called 51ND09.

Function of this product has FBR51ND09.

Manufacturers : Fujitsu Media Devices

Image and pinout :

Some of the text within the PDF file :

COMPACT POWER RELAY 1 POLE25 A (FOR AUTOMOTIVE APPLICATIONS) FBR51, 52 SERIES s FEATURES Compact and lightweight structure (42% of the volume of the FBR160 relay) q High current contact capacity (carrying current: 35 A/10 minutes, 25 A/1 hour) q High resistance to vibration and shock q Improved heat resistance and extended operation range q Two contact gap options (FBR51: 0.3 mm, FBR52: 0.6 mm) q Three types of contact material q s ORDERING INFORMATION [Example] (a) (b) (c) FBR51 (a) N D12 (b) (c) – W (d) ** (e) FBR51 : Standard type (contact gap 0.3 mm) FBR52 : Wider contact gap type (contact gap 0.6 mm) N D06 D09 D10 D12 W W1 WL : Plastic sealed type : 6 VDC : 9 VDC : 10 VDC : 12 VDC : Silver-tin oxide indium : Silver-tin oxide indium (high power type) : [ ... ]

51ND09 PDF Datasheet Download