This part is a kind of semiconductor called BT169D-L.

Function of this product has SCR.

Manufacturers : NXP Semiconductors

Image and pinout :

Some of the text within the PDF file :

TO-92 BT169D-L SCR 20 March 2014 Product data sheet 1. General description Planar passivated very sensitive gate Silicon Controlled Rectifier in a SOT54 (TO-92) plastic package. 2. Features and benefits • Planar passivated for voltage ruggedness and reliability • Very sensitive gate 3. Applications • Ignition circuits • Low power latching circuits • Protection / shut-down circuits: lighting ballasts • Protection / shut-down circuits: Switched Mode Power Supplies 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions VDRM repetitive peak offstate voltage VRRM repetitive peak reverse voltage ITSM non-repetitive peak on- half sine wave; Tj(init) = 25 °C; state current tp = 10 ms; Fig. 4; Fig. 5 IT(RMS) RMS on-state current half sine w [ ... ]

BT169D-L PDF Datasheet Download