S8050 J3Y NPN 40V 500mA 300mW Transistor SOT-23

S8050 J3Y NPN 40V 500mA 300mW Transistor SOT-23 is a versatile, low-power bipolar junction transistor (BJT) widely employed for switching and amplification tasks in compact electronic designs. As an NPN device, the S8050 consequently provides current gain and effectively manages moderate currents, offering a maximum collector current (I_C) of 500 mA and a collector-emitter voltage (V_CE) tolerance up to 40 V. Its small SOT-23 surface-mount package makes it the ideal choice for density-constrained Printed Circuit Boards (PCBs) found in consumer electronics and portable battery-powered equipment. Therefore, designers frequently specify the S8050 for high-volume applications that demand a reliable, cost-effective, and miniature component solution for driving LEDs, small relays, and basic signal amplification.

Key Features:

• High Collector Current Capability: Handles a maximum continuous collector current (I_C) of 500 mA, making it suitable for driving medium-current loads.
• Low Power Dissipation: The compact SOT-23 package supports a total power dissipation (P_D) of up to 300 mW, optimizing thermal performance in small circuits.
• High Voltage Rating: Features a Collector-Emitter breakdown voltage (V_CEO) of 25 V and a Collector-Base voltage (V_CB) of 40 V, providing robust operation in various supply environments.
• High DC Current Gain (h_FE): Offers excellent current amplification, typically ranging from 85 to 300, allowing a low base current to control a much larger collector current.
• Surface Mount Package: The miniature SOT-23 package allows for high-density placement, which conserves valuable board space in portable devices.

Technical Specifications:

• Transistor Type: NPN Bipolar Junction Transistor (BJT)
• Collector-Base Voltage (V_CB): 40 V max
• Collector-Emitter Voltage (V_CE): 25 V max
• Emitter-Base Voltage (V_EB): 6 V max
• Collector Current (I_C): 500 mA max
• Total Power Dissipation (P_D): 300 mW max
• DC Current Gain (h_FE): 85 ≤ h_FE ≤ 300 (Typically 120 for J3Y marking)
• Transition Frequency (f_T): ≥ 100 MHz (Allows for decent high-frequency use)
• Operating Junction Temperature (T_J): −55°C to +150°C

Mechanical Specifications:

• Package Type: SOT-23 (Small Outline Transistor)
• Mounting Style: Surface Mount Device (SMD/SMT)
• Marking Code: J3Y (Common industry-standard marking)
• Weight: ≈ 8 mg (Extremely low weight)

Dimensions:

• Body Length (L): ≈ 2.9 mm
• Body Width (W): ≈ 1.3 mm
• Overall Height (H): ≈ 1.0 mm
• Lead Pitch: ≈ 0.95 mm (Between adjacent leads)
• Footprint: Standard SOT-23 footprint for automated assembly.

Pinout and Wiring:

• Pin 1 (Base – B): Control terminal. Applying a small positive current here turns the transistor ON.
• Pin 2 (Emitter – E): Common reference point, typically connected to ground (GND).
• Pin 3 (Collector – C): Output terminal, typically connected to the load and the positive supply (V_CC).
• Wiring Tip: Always include a base current-limiting resistor to protect the transistor and the driving circuit (e.g., a microcontroller pin). Furthermore, ensure you observe correct polarity.

Datasheet Reference:

• Download S8050 NPN Transistor Datasheet

Commonly Used in:

• Switching Circuits: Acts as a saturation switch for turning ON/OFF low-voltage, medium-current DC loads.
• Low-Noise Amplification: Utilized in pre-amplifier stages for audio and general signal amplification where its h_FE provides excellent gain.
• DC-DC Converters: In essence, it functions as a switching element in various power management circuits for portable devices.

Applications:

• LED and Display Drivers: Effectively drives segments of LED displays or small LED lighting circuits.
• Small Motor and Relay Control: Switches the current for small DC motors, buzzers, and low-power electromechanical relays.
• Digital Logic Interfaces: Serves as an essential buffer or level-shifter between microcontrollers and higher-voltage/current components.
• Portable Devices: Powers and controls various functions in smartphones, tablets, and wearable electronics.

Equivalent Models:

• 2N3904 (SMD Version): A highly common NPN BJT, however, verify its lower current rating (I_C) before direct substitution.
• S9013 (J3): Another popular NPN transistor with similar specifications, often used interchangeably, nevertheless, its parameters might vary slightly.
• BC817: A reliable alternative NPN transistor in a SOT-23 package, offering similar current handling capabilities.

Package Includes:

• 1 x S8050 J3Y NPN Transistor SOT-23