D882 NPN 30V 3A 1.25W Transistor TO-126

D882 NPN 30V 3A 1.25W Transistor TO-126 is a medium-power silicon epitaxial planar bipolar junction transistor engineered for efficient switching and general-purpose amplification circuits. This component delivers exceptional performance by handling continuous collector currents up to 3 A with a very low collector-emitter saturation voltage. Consequently, it minimizes power losses and operates reliably in power-sensitive embedded designs. Furthermore, its robust TO-126 package offers superior thermal dissipation compared to smaller plastic housings. Therefore, engineers frequently select this transistor for voltage regulation, motor driving, and audio output stages where high current capability in a compact footprint remains essential.

Key Features:

• High Current Capability: Supports a high continuous collector current rating of up to 3 A for driving substantial inductive and resistive loads.
• Low Saturation Voltage: Maintains a low V_CE(sat) (≤ 0.5 V at 3 A), which reduces internal power dissipation and improves overall circuit efficiency.
• High DC Current Gain: Delivers exceptional current gain linearity across a wide current range, simplifying base drive circuit requirements.
• Thermal Stability: Features a rugged TO-126 package that facilitates easy heatsink mounting to ensure stable operation under heavy thermal stress.
• Complementary Pair Available: Pairs seamlessly with the PNP B772 transistor for building balanced push-pull amplifier configurations.

Technical Specifications:

• Transistor Polarity: NPN
• Collector-Base Voltage (V_CBO): 40 V
• Collector-Emitter Voltage (V_CEO): 30 V
• Emitter-Base Voltage (V_EBO): 5 V
• Continuous Collector Current (I_C): 3 A
• Peak Collector Current (I_CP): 7 A
• Total Power Dissipation (P_C): 1.25 W (without heatsink), ≈ 10 W (with heatsink)
• DC Current Gain (h_FE): 60 to 400 (classified into R, Q, P, E grades)
• Transition Frequency (f_T): ≈ 90 MHz
• Operating Junction Temperature (T_J): -55 °C to +150 °C

Mechanical Specifications:

• Package Type: TO-126 (SOT-32) Plastic Through-Hole
• Mounting Type: PCB Through-Hole with integrated heatsink mounting hole
• Lead Count: 3-pin configuration
• Thermal Resistance Junction to Case (R_θJC): ≈ 10 °C/W

Dimensions:

• Body Height: ≈ 11.0 mm
• Body Width: ≈ 7.8 mm
• Body Thickness: ≈ 2.7 mm
• Lead Length: ≈ 15.5 mm
• Pin Pitch: ≈ 2.3 mm
• Mounting Hole Diameter: ≈ 3.2 mm

Pinout and Wiring:

• Pin 1 (Emitter): Connects to the ground or negative return path for conventional NPN common-emitter configurations.
• Pin 2 (Collector): Connects to the load or high-side potential to facilitate main load current switching.
• Pin 3 (Base): Connects to the control trigger via a current-limiting resistor to modulate conduction.
• Note: However, you must observe the pin orientation with the printed face towards you (Pin 1 on the left: Emitter, Pin 2 in the center: Collector, Pin 3 on the right: Base).

Datasheet Reference:

• Download 2SD882 / D882 Datasheet

Commonly Used in:

• Power Supplies: Linear voltage regulators, DC-DC converter circuits, and series-pass regulators.
• Audio Equipment: Low-frequency output stages and Class-AB push-pull audio power amplifiers.
• Relay Drivers: High-current switching modules interfaceable directly with microcontrollers.

Applications:

• DC Motor Speed Control: Regulating current and direction in low-voltage DC motors and small robotic actuators.
• LED String Drivers: Driving high-brightness power LED arrays safely without thermal runaway.
• Solenoid and Valve Actuation: Controlling industrial relays, mechanical actuators, and inductive coils.
• Emergency Lighting Inverters: Switching high current pulses in battery-backed backup light systems.

Equivalent Models:

• 2SD882: Direct exact cross-reference and alternative part designation across multiple manufacturers.
• BD139: Standard medium-power alternative, although it offers a lower maximum collector current of 1.5 A.
• KSD882: Exact pin-compatible replacement manufactured by ON Semiconductor / Fairchild.
• 2N4922: Complementary general-purpose medium-power NPN silicon transistor option.

Package Includes:

• 1 x D882 NPN 30V 3A 1.25W Transistor TO-126