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2N3055
2N3055
| Part Number | 2N3055 |
|---|---|
| Manufacturer | STMicroelectronics (ST) |
| Category | Discrete Semiconductor Products > Transistors – Bipolar (BJT) – Single |
| Description | Complementary Silicon High-Power NPN Transistor, 60V Vceo, 15A Continuous Collector Current, 115W Power Dissipation, TO-3 Hermetic Metal Can Package. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
2N3055 from STMicroelectronics is a mainstream NPN power transistor for high-power switching, audio amplifiers and industrial control circuits. Adopting planar island-base process, it delivers stable gain, low saturation voltage and high load capacity. With 15A continuous collector current and 115W power dissipation at 25°C, the sealed TO-3 metal shell provides great heat dissipation and durability for power supply, inverter, motor drive and audio amplifier circuits.
Core Advantages
Time-Tested Planar “Island” Base Construction
ST mature planar process ensures stable parameters, tight batch tolerance and wide safe operating area to resist instantaneous electrical surges.
High Power Dissipation Capacity
Metal shell packaging reduces thermal resistance; the transistor can dissipate up to 115W when matched with qualified external heat sink.
Low Collector-Emitter Saturation Voltage
Low VCE(sat) under high current cuts internal power loss, stabilizes circuit voltage and reduces operating heat generation.
Perfect Complementary Matching Performance
Standard NPN power tube for push-pull circuit design, perfectly paired with PNP tube MJ2955 to minimize audio signal distortion.
Key Specifications
| Brand | STMicroelectronics (ST) |
|---|---|
| RoHS Status | RoHS Compliant, lead-free version available |
| EDA/CAD Model | Schematic symbols, TO-3 through-hole footprint and 3D STEP models available upon request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | TO-3 (Hermetic Metal Can, JEDEC TO-204AA) |
| Mounting Type | Through Hole |
| Surface Marking | 2N3055 + ST Logo Marking |
| Transistor Polarity | NPN |
| Collector-Emitter Voltage (VCEO) | 60 V (Maximum rating, base open circuit) |
| Collector-Base Voltage (VCBO) | 100 V (Maximum rating, emitter open circuit) |
| Continuous Collector Current (IC) | 15 A |
| Max Power Dissipation (PD) | 115W (Tc ≤ 25°C) |
| DC Current Gain (hFE) | 20 ~ 70 (Test condition: IC=4A, VCE=4V) |
| Operating Junction Temperature | -65°C ~ +200°C, wide high-temperature operating range |
| Emitter-Base Voltage (VEBO) | 7 V (Added supplementary standard parameter) |
| Maximum Base Current (IB) | 7 A |
| Thermal Resistance (Junction to Case) | 1.5 °C/W |
| JEDEC Package Code | TO-204AA |
| Complementary Matching Device | MJ2955 (PNP Power Transistor) |
| Storage Temperature Range | -65°C ~ +200°C |
Typical Applications
- High-stability linear regulated power supplies, bench adjustable power units
- High-power audio amplifiers, subwoofer drive circuits, public broadcast equipment
- Industrial DC motor speed regulators, relay and solenoid drive circuits
- High-current power switching, DC to AC inverters, power conversion modules
- General electromagnetic coil drive, electronic prototype development circuits
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Ship within 1-2 working days after payment |
| Delivery Time | 3-7 working days global delivery |
| Shipping Methods | DHL, UPS, FedEx, EMS Express |
| Payment Methods | T/T Bank Transfer, PayPal, Credit Card, Western Union |
Technical Support
Submit inquiry form to request official datasheet, free samples, stock check or bulk quotation; we will reply within 24 hours.
Frequently Asked Questions
Q1: Why TO-3 2N3055 only has two pins?
A: The metal shell is connected to collector as the third electrode. The two exposed pins are base and emitter, which improves current capacity and heat dissipation.
Q2: Which PNP transistor matches 2N3055 for push-pull circuits?
A: MJ2955 is the matched complementary PNP tube with same TO-3 package, it realizes low-distortion symmetrical audio output.
Q3: Do I need insulation pads when mounting on aluminum heat sink?
A: Yes. The shell carries collector voltage, direct contact will cause short circuit. Silicone/mica insulation pads are required for isolation while keeping thermal conductivity.
Q4: What’s the advantage of original ST 2N3055 over generic copies?
A: ST planar process delivers wider safe operating area, faster switching speed and stable batch parameters, avoiding performance drift.
Q5: Can I get free samples of 2N3055 for testing?
A: Yes, we support small free sample orders for lab testing, just submit your demand via inquiry form.
Q6: Do I need to derate power above 25℃ working temperature?
A: Yes. Max 115W power rating only applies at 25℃ case temperature; power must be reduced at higher temperatures.
Q7: What alternative model can replace 2N3055 if out of stock?
A: NPN power transistors with Vceo≥60V, Ic≥15A TO-3 package can be used as temporary substitutes, MJ15003 is a common alternative.
Q8: What is the service life of ST original 2N3055?
A: Over 10,000 hours stable service under rated operating conditions, with 1-year quality warranty provided by our store.
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