This part is a kind of semiconductor called EC103D1.
Function of this product has SCR.
Manufacturers : NXP
Image and pinout :
Some of the text within the PDF file :
TO-92 EC103D1 SCR 22 July 2014 Product data sheet 1. General description Planar passivated ultra sensitive gate Silicon Controlled Rectifier in a SOT54 (T0-92) plastic package. 2. Features and benefits • Planar passivated for voltage ruggedness and reliability • Ultra sensitive gate 3. Applications • Electronic ballasts • Safety shut down and protection circuits • Sensing circuits • Smoke detectors • 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(AV) average on-state current half sine wave; Tlead ≤ 92 °C; Fig. [ ... ]