Okay, here's a breakdown of the provided document, summarizing its contents and key information. This is a technical datasheet for a power transistor, specifically the 2SB688.

Overall Description:

This document is a datasheet for the 2SB688 power transistor. Datasheets provide detailed technical specifications, electrical characteristics, and other crucial information for engineers and technicians to use the component correctly in their designs. It includes absolute maximum ratings, electrical characteristics, thermal characteristics, typical performance graphs, package dimensions, and revision history.

Key Sections and Information:

️· Package Options: The transistor is available in two packages: TO-247 and TO-3PB. The datasheet includes mechanical dimensions for both packages.
️· Absolute Maximum Ratings: These are the limits beyond which the transistor could be damaged. Important values include:
- Collector-Emitter Voltage (VCEO): -180V (specific versions vary slightly)
- Collector Current (IC): -8 to -12A (depending on the specific 2SB688 variant - A, B, or C)
- Collector Dissipation (PC): 80W
- Junction Temperature (Tj): 150°C
️· Electrical Characteristics: These specify how the transistor behaves under different conditions. Important parameters include:
- Current Gain (hFE): Typically 80-160 (depends on variant).
- Collector-Emitter Saturation Voltage (VCE(sat)): ~2.0V
- Base-Emitter Voltage (VBE(ON)): ~1.5V
- Transition Frequency (fT): 12 MHz
️· Thermal Characteristics: These define the transistor's ability to dissipate heat. Key value:

- Thermal Resistance (Rth(j-c)): 1.56 °C/W (for TO-247 package)
️· Performance Graphs: Several graphs provide visual representations of the transistor’s behavior, including:
- hFE vs. Collector Current
- VCE(sat) vs. Collector Current
- SOA (Safe Operating Area) – demonstrates voltage and current limits
️· Revision History: The last entry indicates that this document was released on February 17, 5016, and represents the initial version (201602A).

Variants:

The 2SB688 comes in several variants (A, B, and C), each with slightly different electrical characteristics. This is reflected in the tables and graphs provided.

Purpose:

The document is designed to help engineers select and use the 2SB688 transistor appropriately in power amplifier, switching, and other applications requiring a high-power NPN transistor.

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