S9013 Transistor J3 NPN 50V 500mA 300mW SOT-23

S9013 Transistor (Marking J3) is a widely used low-power NPN bi-polar junction transistor (BJT) optimized for general-purpose switching and amplification applications. Engineers frequently select this component for designs where space is at a premium, thanks to its compact SOT-23 surface-mount package. With a robust collector current rating of 500 mA and a collector-emitter voltage of 25V, the S9013 easily handles medium-current loads like driving small relays, LEDs, and audio pre-amplification stages. Its high current gain and low saturation voltage make it an exceptionally efficient choice for both digital switching circuits and analog signal amplification in portable and battery-powered devices.

Key Features:

• NPN Transistor Type: Functions reliably in common emitter configurations for switching and amplification.
• High Collector Current: Handles a continuous collector current (I_C) of up to 500 mA, suitable for driving intermediate loads.
• Low Saturation Voltage: Offers efficient switching with minimal power loss in the saturation region.
• Compact SOT-23 Package: Ideal for high-density surface-mount designs and miniaturized electronic assemblies.
• High Gain: Provides excellent current gain (h_FE), allowing a small base current to control a significant load current.

Technical Specifications:

• Transistor Type: NPN Bi-polar Junction Transistor (BJT)
• Collector-Base Voltage (V_CBO): Maximum 50 V
• Collector-Emitter Voltage (V_CEO): Maximum 25 V
• Emitter-Base Voltage (V_EBO): Maximum 5 V
• Collector Current (I_C): Maximum 500 mA
• Collector Power Dissipation (P_D): Maximum 300 mW
• DC Current Gain (h_FE): Typically 64 to 200 (Varies by specific grouping)
• Transition Frequency (f_T): ≈ 150 MHz

Mechanical Specifications:

• Package Type: SOT-23 (Small Outline Transistor, 3-pin)
• Mounting Style: Surface Mount Device (SMD)
• Operating Temperature Range: -55°C to +150°C
• Marking Code: J3

Dimensions:

• Package Length: ≈ 2.9 mm
• Package Width: ≈ 1.3 mm
• Package Height: ≈ 1.0 mm
• Weight: < 0.01 g (Extremely low weight)

Pinout and Wiring:

• Pin 1: Base (B) – Receives the control signal/current.
• Pin 2: Emitter (E) – Typically connected to ground or the lowest potential.
• Pin 3: Collector (C) – Connected to the load (e.g., LED, relay coil) and the positive power rail.
• Standard Operation: Apply a small positive voltage/current to the Base (Pin 1) to allow current flow from Collector (Pin 3) to Emitter (Pin 2).

Datasheet Reference:

• Download S9013 NPN Transistor Datasheet

Commonly Used in:

• Consumer Electronics: Found in mobile phones, remote controls, and small electronic toys.
• LED Lighting Circuits: Driving single or small clusters of LEDs efficiently.
• Microcontroller Interfaces: Used as a buffer or amplifier stage between low-current logic output and higher-current loads.

Applications:

• General Purpose Switching: Controlling relays, buzzers, and low-power motors.
• Audio Pre-Amplification: Providing voltage gain in the early stages of audio circuits.
• Driver Circuits: Used as the main current switch in driver stages for medium-power applications.

Equivalent Models:

• BC817: A very common, general-purpose NPN transistor often used as a direct or close substitute.
• 2N3904 (SMD Version): A similar low-power NPN device, though with a typically lower maximum collector current (I_C).
• S8050: A similar NPN transistor that often offers slightly higher current and power ratings.

Package Includes:

• 1 x S9013 Transistor J3 NPN 50V 500mA 300mW SOT-23