The 2SC2270 (often marked as C2270) is a silicon NPN epitaxial planar power transistor manufactured using Planar Collector Technology (PCT). Engineered for low-saturation, high-current switching and medium-power linear amplification, the 2SC2270 delivers a high continuous collector current rating of up to 5A, low collector-emitter saturation voltage, and excellent DC current gain linearity. It is widely used in audio power output stages, relay and solenoid actuators, motor speed controls, and DC-DC power converter circuits.

Specifications

• Brand / Manufacturer: Toshiba / SavantIC / Inchange Semiconductor / Industry Standard
• Part Number / Marking: 2SC2270 / C2270
• Transistor Type: Silicon NPN Epitaxial Planar Power Transistor
• Collector-Base Voltage (V_CBO): 50V
• Collector-Emitter Voltage (V_CEO): 20V to 30V
• Emitter-Base Voltage (V_EBO): 8.0V
• Continuous Collector Current (I_C): 5.0A
• Peak Collector Current (I_CP): 8.0A
• DC Current Gain (h_FE): 140 to 450 (at I_C = 0.5A, V_CE = 2.0V)
• Collector-Emitter Saturation Voltage (V_CE(sat)): < 0>C = 3.0A, I_B = 0.15A)
• Base-Emitter Saturation Voltage (V_BE(sat)): < 1>C = 3.0A, I_B = 0.15A)
• Transition Frequency (f_T): Approx. 100 MHz (Typical at I_C = 0.5A, V_CE = 2.0V)
• Collector Power Dissipation (P_C): 1.5W (Free Air at T_a = 25°C) / 10W to 15W (at T_c = 25°C with Heatsink)
• Operating Junction & Storage Temperature: -55°C to +150°C
• Package / Case: TO-220 / TO-126 Compatible Power Package (Pin 1: Emitter, Pin 2: Collector, Pin 3: Base / Standard Pinout: Pin 1: Base, Pin 2: Collector, Pin 3: Emitter)

Features

• High Collector Current Capability: Handles high continuous load currents up to 5A, making it ideal for medium-power driving applications.
• Ultra-Low Saturation Voltage (V_CE(sat) < 0>
• High and Stable DC Current Gain (h_FE up to 450): Ensures efficient switching performance with minimal base drive current requirements.
• Planar Collector Technology (PCT): Provides enhanced dielectric breakdown reliability, fast switching transition speeds, and long-term operating stability.
• Robust Power Package: Metal mounting tab facilitates direct heatsink mounting for superior thermal transfer in demanding applications.

Common Applications

• Audio Power Amplifiers: High-fidelity audio driver and power output stages.
• Relay & Solenoid Drivers: High-current switching for industrial coils, valves, and automotive actuators.
• DC Motor Control: Low-side drive and PWM speed control for DC brushed motors and cooling fans.
• Linear & Switching Power Supplies: High-current series pass regulator and step-down converter switching stages.
• High-Current LED & Lamp Driving: Efficient power switching for incandescent lamps and multi-watt LED arrays.

Usage Tips

• Heatsink Installation: For continuous collector currents exceeding 1A or power dissipation above 1.5W, mount the transistor to an aluminum heatsink using thermal grease and an insulating pad if electrical isolation from the collector is required.
• Base Drive Sizing: Use an appropriately calculated base resistor (R_B) to supply sufficient overdrive (I_B ≈ I_C / 20) to guarantee complete transistor saturation.
• Base Pull-Down Resistor: Connect a 10kΩ resistor between Base and Emitter (GND) to keep the transistor firmly turned OFF during controller bootup or floating input conditions.
• Inductive Clamping: When driving inductive loads such as relays or motors, always place a fast freewheeling diode (e.g., 1N5822 Schottky) across the load to protect the collector against inductive voltage spikes.

Datasheet