Toshiba 2SA679/2SC1079 Transistor Pair: Complete Technical Guide for Audio Amplifier Applications
Toshiba 2SA679/2SC1079 Transistor Pair
High-Performance Audio Power Transistors for Professional Amplifier Applications
Product Overview
The Toshiba 2SA679/2SC1079 transistor pair represents a classic combination of complementary power transistors specifically designed for high-fidelity audio amplifier applications. These silicon transistors in TO-3 packages offer exceptional power handling capabilities and reliability, making them ideal for professional audio equipment and high-end consumer electronics.
Technical Specifications
| Parameter | 2SA679 (PNP) | 2SC1079 (NPN) | Unit |
|---|---|---|---|
| Material | Silicon (Si) | - | |
| Polarity | PNP | NPN | - |
| Package | TO-3 | - | |
| Max Collector Power Dissipation (Pc) | 100 | 100 | W |
| Max Collector-Base Voltage (Vcb) | 110 | 150 | V |
| Max Collector-Emitter Voltage (Vce) | 110 | 150 | V |
| Max Emitter-Base Voltage (Veb) | 5 | 5 | V |
| Max Collector Current (Ic) | 8 | 15 | A |
| Current Gain (hFE) | 40-140 | 40-140 | - |
| Transition Frequency (fT) | 10 | 10 | MHz |
Key Features and Applications
Primary Features:
- High Power Dissipation: 100W maximum power handling capability
- Complementary Pair: Perfectly matched PNP and NPN transistors
- TO-3 Package: Robust metal package for excellent thermal performance
- High Current Capability: Up to 15A collector current for 2SC1079
- Excellent Linearity: Ideal for high-fidelity audio applications
Typical Applications:
- High-power audio amplifiers
- Professional audio equipment
- Home theater systems
- Guitar amplifiers
- Public address systems
- Studio monitoring equipment
Replacement and Equivalent Transistors
When sourcing replacements for the 2SA679/2SC1079 pair, it's crucial to ensure compatibility. The original Toshiba 2SA679/2SC1079 pair offers the best performance and reliability. However, some commonly used replacements include:
| Original | Replacement Options | Notes |
|---|---|---|
| 2SC1079 (NPN) | Sanken 2SC1116A, MJ15024 | Ensure proper heat sinking |
| 2SA679 (PNP) | Sanken 2SA1115A, MJ15025 | Check pin compatibility |
Frequently Asked Questions
These transistors are primarily used in high-power audio amplifier output stages, particularly in complementary symmetry configurations for push-pull amplifier designs.
While original Toshiba production may have ceased, high-quality reproductions and NOS (New Old Stock) units are available through authorized distributors like Koeed Electronics.
The TO-3 package allows for excellent thermal performance, with maximum junction temperature typically around 150°C when properly heat-sinked.
While primarily designed for linear audio applications, they can be used in switching circuits, though their transition frequency of 10MHz may limit high-frequency performance.
Always use appropriate heat sinking, thermal compound, and follow proper mounting procedures for TO-3 packages. Ensure electrical isolation where required.
Purchase Information
For authentic Toshiba 2SA679/2SC1079 transistor pairs, we recommend purchasing from authorized distributors to ensure quality and authenticity. These transistors are available as matched pairs for optimal performance in audio amplifier circuits.
Purchase Authentic 2SA679/2SC1079 PairTechnical References and Trust Metrics
Industry Recognition: The 2SA679/2SC1079 pair has been widely used in professional audio equipment from manufacturers like Pioneer, particularly in models such as the Pioneer SA-9900 amplifier.
Quality Assurance: When purchasing the 2SA679/2SC1079 transistor pair, ensure you receive genuine components with proper packaging and documentation.
Technical Documentation: Always refer to the official datasheets for detailed specifications and application notes when designing circuits using these transistors.
Conclusion
The Toshiba 2SA679/2SC1079 transistor pair remains a benchmark for high-performance audio power transistors. Their robust TO-3 packaging, high power handling capabilities, and excellent linearity make them ideal for demanding audio applications. Whether you're restoring vintage audio equipment or designing new high-fidelity amplifiers, the authentic 2SA679/2SC1079 pair delivers the reliability and performance that audio professionals demand.
