This part is a kind of semiconductor called DTC144ESA.

Function of this product has Digital transistors.

Manufacturers : JCET

Image and pinout :

Some of the text within the PDF file :

JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD Digital transistors (built-in resistors) DTC144EE/DTC144EUA /DTC144ECA/DTC144EKA/DTC144ESA DIGITAL TRANSISTOR (NPN) FEATURES 1. Built-in bias resistors enable the configuration of an inverter circuit without connecting external input resistors(see equivalent circuit). 2. The bias resistors consist of thin-film resistors with complete isolation to allow negative biasing of the input. They also have the advantage of almost completely eliminating parasitic effects. 3. Only the on/off conditions need to be set for operation, making device design easy. PIN CONNENCTIONS AND MARKING DTC144EE DTC144EUA SOT-523 Addreviated symbol: 26 DTC144EKA SOT-23 SOT-23-3L Addreviated symbol: 26 DTC144ESA SOT-323 Addreviated symbol: 26 DDTTAC111444E [ ... ]

DTC144ESA PDF Datasheet Download