This is a kind of semiconductor, D1047 Datasheet PDF learn more.
Part number : D1047
Functions : NPN Transistor
Package information : TO-3P Type
Manufacturer : STMicroelectronics
The texts in the PDF file :
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.
1. High breakdown voltage VCEO = 140 V
2. Typical ft = 20 MHz
3. Fully characterized at 125 oC
1. Power supply
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Pin arrangement : 1. Base, 2. Collector, 3. Emitter