S9014 NPN Transistor – 45V 100mA TO-92
The S9014 NPN Transistor is a general-purpose bipolar junction transistor (BJT) designed for low-power switching, small-signal amplification, and electronic control applications.
Featuring a maximum collector-emitter voltage of 45V and a collector current rating of 100mA, the S9014 is suitable for audio preamplifiers, signal-processing circuits, transistor switching stages, and educational electronics projects.
Its compact TO-92 through-hole package makes it ideal for PCB assembly, breadboard prototyping, Arduino projects, and DIY electronic circuits.
Key Features
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NPN Bipolar Transistor: Suitable for switching and signal amplification.
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45V Collector-Emitter Rating: Supports low-voltage electronic circuits.
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100mA Collector Current: Designed for small-signal and low-current applications.
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Small-Signal Amplification: Suitable for audio and general-purpose amplifier stages.
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Compact TO-92 Package: Easy to integrate into electronic circuits.
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Through-Hole Mounting: Suitable for PCB assembly and prototyping.
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General-Purpose Design: Ideal for signal processing, transistor drivers, and switching circuits.
Technical Specifications
| Parameter |
Specification |
| Model |
S9014 |
| Transistor Type |
NPN Bipolar Junction Transistor |
| Package |
TO-92 |
| Mounting Type |
Through-Hole |
| Collector-Emitter Voltage (VCEO) |
45V |
| Collector-Base Voltage (VCBO) |
50V |
| Emitter-Base Voltage (VEBO) |
5V |
| Maximum Collector Current (IC) |
100mA |
| Maximum Power Dissipation |
400mW (manufacturer-dependent) |
| Transition Frequency (fT) |
Approximately 150MHz (typical, manufacturer-dependent) |
| DC Current Gain (hFE) |
Depends on device grade and operating conditions |
| Number of Terminals |
3 |
Pin Configuration
The S9014 transistor has three terminals:
| Pin |
Name |
Function |
| 1 |
Emitter (E) |
Typically connected toward ground in low-side switching circuits |
| 2 |
Base (B) |
Controls transistor conduction |
| 3 |
Collector (C) |
Connects to the load or amplifier circuit |
Important: The E-B-C configuration follows the supplied product pinout illustration. Physical pin arrangements may vary by manufacturer. Verify the actual transistor datasheet before wiring.
Connection Example – Arduino
The S9014 can be used with Arduino to control low-current electronic loads.
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Emitter: Connect to GND.
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Base: Connect to an Arduino digital output through a suitable current-limiting resistor.
-
Collector: Connect to the negative terminal of the load.
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Load Positive: Connect to the appropriate positive supply.
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Common Ground: Connect the Arduino and external power supply grounds together.
For inductive loads such as small relays, use a suitable flyback diode.
Note: Ensure the load current does not exceed the transistor's rated limits and that sufficient base current is available for reliable switching.
Applications
- Arduino and Microcontroller Projects
- Small-Signal Audio Amplifiers
- Audio Preamplifier Circuits
- Low-Current Switching Circuits
- LED Driver Circuits
- Signal Processing Circuits
- Transistor Amplifier Stages
- Electronic Control Circuits
- DIY Electronics and Prototyping
- Educational Electronics Projects
Important Notes
-
The S9014 is an NPN transistor, not a PNP transistor.
- A suitable base resistor is required when connecting the transistor to a microcontroller output.
- Do not exceed the maximum collector current, voltage, or power dissipation ratings.
- The transistor is intended for low-current applications and is not suitable for directly driving high-power loads.
- The DC current gain varies depending on the manufacturer and device grade.
- Verify the transistor pinout before installation.
Package Includes
