This part is a kind of semiconductor called ND2410L.

Function of this product has (ND2406L / ND2410L) N-Channel Depletion-Mode MOSFET Transistors.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

ND2406L/2410L, BSS129 N-Channel Depletion-Mode MOSFET Transistors Product Summary Part Number ND2406L ND2410L BSS129 230 V(BR)DSV Min (V) 240 rDS(on) Max (W) 6 10 20 VGS(off) (V) –1.5 to –4.5 –0.5 to –2.5 –0.7 (min) ID (A) 0.23 0.18 0.15 Features D D D D D High Breakdown Voltage: 260 V Normally “On” Low rDS Switch: 3.5 W Low Input and Output Leakage Low-Power Drive Requirement Low Input Capacitance TO-226AA (TO-92) 1 Benefits D D D D D Full-Voltage Operation Low Offset Voltage Low Error Voltage Easily Driven Without Buffer High-Speed Switching Applications D D D D D Normally “On” Switching Circuits Current Sources/Limiters Power Supply, Converter Circuits Solid-State Relays Telecom Switches TO-92-18CD (TO-18 Lead Form) 1 S S G 2 D 2 D [ ... ]

ND2410L PDF Datasheet Download