The D2498 (2SD2498) is a high-performance NPN bipolar power transistor designed by Toshiba for demanding applications in audio amplifiers, high-speed switching circuits, and power conversion systems. Rated at 8A and 140V, this rugged TO-3P device is ideal for both consumer electronics repair and professional-grade amplifier projects.
Key Features of the 2SD2498
- High Collector Current: Supports up to 8A continuous, making it suitable for high-power loads
- Voltage Tolerance: Collector-emitter voltage rating of 140V and collector-base up to 160V
- Pulse Operation Ready: Can withstand 15A pulsed collector current for transient-heavy systems
- Fast Switching Performance: With a transition frequency of 15 MHz, it’s optimized for speed
- Excellent Thermal Handling: Rated at 80W power dissipation with a heatsink
- High DC Current Gain: h<sub>FE</sub> range of 40 to 320, ensuring strong amplification
- Sturdy TO-3P Package: Easy to mount on heatsinks for thermal regulation and mechanical support
Technical Specifications of the D2498
| Parameter | Value |
| Transistor Type | NPN BJT |
| Package Type | TO-3P (TO-247 Equivalent) |
| Collector-Emitter Voltage (V<sub>CEO</sub>) | 140V |
| Collector-Base Voltage (V<sub>CBO</sub>) | 160V |
| Emitter-Base Voltage (V<sub>EBO</sub>) | 5V |
| Continuous Collector Current (I<sub>C</sub>) | 8A |
| Pulse Collector Current (I<sub>CP</sub>) | 15A |
| Base Current (I<sub>B</sub>) | 4A |
| Power Dissipation (P<sub>C</sub>) | 80W @ Tc = 25°C |
| DC Current Gain (h<sub>FE</sub>) | 40 to 320 |
| Transition Frequency (f<sub>T</sub>) | 15 MHz |
| Collector-Emitter Saturation Voltage | Max 1.5V @ I<sub>C</sub> = 5A |
| Base-Emitter Saturation Voltage | Max 2.0V @ I<sub>C</sub> = 5A |
| Operating Junction Temp. (T<sub>j</sub>) | -55°C to +150°C |
2SD2498 Transistor Description
The Toshiba 2SD2498 transistor is a high-current, high-voltage NPN BJT ideal for audio and power electronics applications. It’s especially popular among DIY enthusiasts and professional technicians for use in high-wattage audio amplifiers and industrial-grade switching systems.
With a collector current of up to 8 amps, the 2SD2498 can drive robust loads such as speaker arrays, motors, or transformer coils. Its high DC gain ensures efficient signal amplification with minimal distortion, while the 140V voltage ceiling allows safe operation in medium- to high-voltage circuits.
Thermal stability is a key strength. Housed in a TO-3P package, this transistor can safely dissipate up to 80 watts of heat when properly mounted to a heatsink—making it a go-to choice for reliable long-term use in high-power environments.
Common Applications of the D2498
- Audio Amplifier Output Stages – Ideal for Class AB push-pull configurations
- Switching Mode Power Supplies (SMPS) – Works efficiently in high-speed DC conversion
- Inverters & Motor Drivers – Handles heavy switching loads without breakdown
- Relay & Solenoid Drivers – Excellent for high inrush current control
- DC-DC Power Regulation – Used in DC boost or buck converter systems
Complementary & Related Products
Pair the 2SD2498 with these components to build a complete, balanced circuit:
- 2SB1649 PNP Transistor – A complementary match for push-pull amplifier stages
- TIP35C – A comparable NPN power transistor alternative with similar specs
- 2SC5200 – High-end audio BJT alternative, especially in premium amplifier designs
- TO-3P Compatible Heatsink – Essential for thermal management
- Thermal Paste & Insulating Pads – Improve heat transfer and prevent shorts
What’s Included, Testing & Installation Tips of the D2498
- 1 x 2SD2498 NPN Power Transistor
- Packaged safely in an anti-static bag or protective foam
- Use a digital multimeter in diode mode to verify junction integrity (B-E and C-E)
- Drive base with at least 1/10<sup>th</sup> of collector current for reliable switching
- Ensure adequate heatsinking—this transistor can get hot under full load
- Pinout: 1. Base, 2. Collector (Tab is also Collector), 3. Emitter
2SD2498 Datasheet
Click on the link ahead to view and download the D2498 transistor datasheet. 2SD2498 datasheet.
Customer Reviews
★★★★★
“I used the 2SD2498 in a 200W audio amplifier rebuild. Great gain and thermal stability. Would buy again.”
— Brian K., Nairobi
★★★★★
“Excellent quality and fast delivery from Dukatronic. Worked flawlessly in a custom Swithiching Mode Power Supply project.”
— Isaac M., Mombasa
★★★★☆
“Very solid transistor. My only wish is that it came with a pre-attached insulator.”
— David M., Eldoret
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