This pack contains two BD139 NPN epitaxial planar transistors, designed for medium-power switching and amplification applications. Housed in a compact TO-126 package, these transistors are widely used in audio amplifiers, driver stages, voltage regulators, and general-purpose electronic circuits.
✅ Specifications:
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Transistor Type: NPN Bipolar Junction Transistor (BJT)
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Part Number: BD139
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Package: TO-126 (SOT-32)
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Collector-Emitter Voltage (Vceo): 80V
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Collector-Base Voltage (Vcbo): 80V
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Emitter-Base Voltage (Vebo): 5V
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Collector Current (Ic): 1.5A (Continuous)
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Power Dissipation (Pd): 12.5W (at 25°C case temperature with proper heatsink)
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DC Current Gain (hFE): 25 – 160 (depending on current)
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Transition Frequency (ft): 190MHz (typical)
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Operating Temperature: -65°C to +150°C
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Complementary PNP Type: BD140
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Quantity: 2 Pieces
⚠️ Note: For operation near maximum power dissipation, a proper heatsink is required. Without adequate cooling, the transistor may overheat and fail.
📦 Applications:
✔️ Audio amplifier driver and output stages
✔️ Medium-power switching circuits
✔️ Voltage regulator pass transistors
✔️ Motor and solenoid drivers
✔️ General-purpose amplification
✔️ Power supply control circuits
✔️ Hobbyist DIY electronics projects
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