KSC1845 Transistor: Equivalent, Datasheet and Pinout [FAQs]

What is KSC1845 Transistor

The KSC1845 belongs to the NPN transistor family, a type of bipolar junction transistor commonly packaged in TO-92 format and crafted from silicon semiconductor material. Within NPN transistors, the key components are the emitter-base and collector-base junctions. For proper conduction, the emitter-base junction must be forward biased, while the collector-base junction should remain reverse biased. Applying a negative voltage to the emitter and a positive voltage to the base can achieve this forward biasing of the emitter-base junction.

Comprised of three layers, the KSC1845 contains one p-doped layer and two n-doped layers. The p-doped layer serves as the base terminal, while the emitter and collector connections are represented by the two n-doped layers.

With three terminals—base, collector, and emitter—the KSC1845 functions as follows: electrons are emitted from the emitter to the base, and subsequently collected from the base by the collector. This process allows controlled current flow through the transistor.

How to use KSC1845?

The primary activation point for a transistor is its base. When a voltage is applied to the base terminal, biasing occurs, allowing current to flow from the collector to the emitter. The schematic for the KSC1845 is illustrated below.

Bipolar devices like the KSC1845 lack symmetry. Reversing the emitter and collector sides shifts their functionality from forward active mode to reverse active mode.

This asymmetry is established through different doping concentrations at these terminals, ensuring distinct functionalities based on their arrangement.

KSC1845 Transistor Pinout

KSC1845 Transistor Specifications

KSC1845 Features

• Transistor Type: NPN bipolar junction transistor.
• Collector Emitter Voltage: Rated at 120V, making it suitable for moderate voltage applications.
• Max Collector Current: Capable of handling currents up to 50mA.
• DC Current Gain (hFE): Typically ranges between 200 to 300 at 1mA and 6V, ensuring signal amplification efficiency.
• Gain Bandwidth Product: 110MHz, allowing it to handle moderate-frequency signals.
• Package / Case: Available in TO-226-3, TO-92-3 packages, common for small-signal transistors.
• Operating Temperature: Can operate at temperatures up to 150°C TJ, suitable for various environmental conditions.
• Max Power Dissipation: Rated at 500mW, indicating its power-handling capabilities in low-power circuits.

KSC1845 Transistor Application

Common application scenarios for KSC1845 transistors include:

• Audio amplifiers: Used in audio amplifiers, especially in preamplifiers or headphone amplifiers that need to amplify low power signals.
• Signal processing: used in circuits that need to amplify weak signals without introducing significant distortion.
• Voltage Amplification: Used in voltage amplification stages in electronic devices.
• Sensor Interface: Integrated into sensor interface circuits that process low-level signals, such as temperature sensors, light sensors, etc.
• Switching Circuits: Although primarily used for amplification, they can also be used in low power switching applications where small signals control large currents.
• Oscillator Circuits: In some cases, can be used in oscillator circuits that generate low frequency signals.

KSC1845 Package Dimensions

How to Choose: KSC1845 Advantages and Disadvantages

Advantages:

• Versatility: Suitable for various low-power amplification applications due to its NPN configuration.
• Reliability: Offers consistent performance within specified parameters.
• Amplification: Good for amplifying small signals in audio and other low-power circuits.
• Availability: Widely available from different manufacturers.

Disadvantages:

• Limited Specs: Its specifications might not fit all applications, especially those requiring higher power handling or different configurations.
• Obsolete in Some Cases: As technology progresses, some newer transistors might offer better specifications or be more suitable for modern applications.
• Specific Application: While it's versatile, its utility might be limited in high-power or high-frequency applications.
• Not Suitable for Every Circuit: Depending on circuit requirements, it might not be the most optimized choice.

KSC1845 Equivalent Parts

KSC1845 Manufacturer

On Semiconductor, listed on Nasdaq as ON, is a pioneering manufacturer dedicated to energy conservation. Renowned for its diverse range of power, signal management, and energy-efficient custom solutions, the company operates a global supply chain with exceptional reliability. With manufacturing facilities, sales offices, and design centers strategically located across North America, Europe, and the Asia Pacific, On Semiconductor delivers world-class semiconductor products to key markets worldwide.

KSC1845 Datasheet PDF

Download KSC1845 datasheet PDF >>

Where to Buy KSC1845 Transistor -- Avaq Semiconductor

The advantages of Avaq are as followings,

• Global Partners: Avaq works with over 1,000 suppliers serving over 10,000 customers with a total supply value of over $700 million. They work with several well-known manufacturers to provide high quality electronic components.

• Diversified Product Offering: Focusing on integrated circuits and discrete semiconductors, they offer a wide selection of components for a variety of electronic devices, including standardized IC products and a wide range of discrete semiconductors.

• Quality Commitment and Customer Care: Based on ISO certification, Avaq is committed to optimizing costs, resolving supply issues, and ensuring high reliability and professional service to meet customer needs.

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