This document is a preliminary datasheet for the STMicroelectronics 2ST2121 NPN power transistor. Here’s a summary of the key information:

Key Features & Specs:

️· Type: NPN Power Transistor
️· Package: TO-3
️· Maximum Collector Current (IC): -17A
️· Maximum Collector-Emitter Voltage (VCEO): -250V
️· Maximum Junction Temperature (TJ): 200°C
️· Power Dissipation (PTOT): 250W
️· Transition Frequency (fT): 25 MHz
️· hFE (DC Current Gain): Ranges from 80 to 160 depending on current levels.

Document Status:

️· Preliminary: The document states the information is subject to change without notice. This means the final product specifications could differ.

Key Sections:

️· Absolute Maximum Ratings: Defines the limits for voltage, current, and temperature to prevent device failure.

️· Electrical Characteristics: Provides typical and minimum/maximum values for key parameters like collector current, breakdown voltages, and gain.
️· Typical Curves: Includes graphs illustrating the transistor's performance under various conditions.
️· Package Dimensions: Details the mechanical dimensions of the TO-3 package.
️· Revision History: Tracks changes made to the document.

Intended Use:

The 2ST2121 is designed for use in power amplification, switching, and other demanding applications where high current and voltage handling are required.