This is a kind of semiconductor, D1047 Datasheet PDF learn more.
Part number : D1047
Functions : NPN Transistor
Package information : TO-3P Type
Manufacturer: STMicroelectronics
Image :

The texts in the PDF file :
Description
The device is a NPN transistor manufactured using new BiT-LA (Bipolar transistor for linear amplifier) technology. The resulting transistor shows good gain linearity behaviour.
Features
1. High breakdown voltage VCEO = 140 V
2. Typical ft = 20 MHz
3. Fully characterized at 125 oC
Application
1. Power supply
[ … ]
Pinout

Pin arrangement : 1. Base, 2. Collector, 3. Emitter




