Transistors

The BF494 is a low-power NPN transistor commonly used in RF amplifier circuits. Operating at frequencies up to several hundred megahertz, it’s ideal for applications in FM radios, RF oscillators, and signal amplification stages. With its compact TO-92 package, it’s widely favored in hobbyist electronics and educational projects.

The BC369 is a high-frequency NPN bipolar junction transistor (BJT) used in electronic circuits for various applications. It features:

• Type: NPN
• Maximum Collector-Emitter Voltage (Vceo): 45V
• Maximum Collector-Base Voltage (Vcbo): 50V
• Maximum Emitter-Base Voltage (Vebo): 5V
• Collector Current (Ic): 800mA
• Power Dissipation (Ptot): 500mW
• Current Gain (hFE): Typically between 40 and 320 (at Ic = 50mA)

The BC369 is well-suited for high-frequency and low-noise applications, including RF amplification and switching. Its wide range of gain and voltage handling makes it a versatile choice for various electronic circuits.

The IRFPE50 is a power MOSFET with the following key specifications:

• Type: N-channel MOSFET
• Maximum Drain-Source Voltage (Vds): 500V
• Maximum Gate-Source Voltage (Vgs): ±20V
• Continuous Drain Current (Id): 4.0A
• Pulsed Drain Current (Id,pulse): 12A
• Maximum Power Dissipation (Pd): 50W
• Gate Threshold Voltage (Vgs(th)): 2.0V to 4.0V
• Maximum Drain-Source On-Resistance (Rds(on)): 0.75Ω (at Vgs = 10V)
• Package Type: TO-3P

The IRFPE50 is suitable for high-voltage power switching applications and is commonly used in power supplies, motor control circuits, and other high-voltage electronic devices. Its high voltage rating and moderate current handling make it ideal for switching applications in industrial and consumer electronics.

The SK100 is a type of Silicon Controlled Rectifier (SCR) with the following key specifications:

• Type: SCR (Silicon Controlled Rectifier)
• Maximum Repetitive Peak Off-State Voltage (Vdrm/VRRM): 100V
• Maximum RMS On-State Current (I(T(RMS))): 1A
• Maximum Average On-State Current (I(T(AV))): 1A (with proper heat sinking)
• Gate Trigger Voltage (Vgt): Typically 0.5V to 1.5V
• Gate Trigger Current (Igt): Typically 1mA to 5mA
• Maximum On-State Voltage (Vtm): Approximately 1.5V at I(T) = 1A
• Package Type: Typically TO-92 or similar

The SK100 is used in low-power applications requiring controlled rectification and switching. It is suitable for use in small power control circuits, phase control, and switching applications.

The IC 7912 is a negative voltage regulator. Here are its key specifications:

• Type: Negative Voltage Regulator
• Input Voltage (Vin): Typically up to 35V
• Output Voltage (Vout): -12V (fixed output)
• Output Current (Iout): Up to 1A
• Dropout Voltage: Typically 2V
• Package Types: TO-220, TO-3, and others
• Features: Overcurrent protection, thermal shutdown

The 7912 is used to provide a stable -12V output from a higher input voltage, which is essential for circuits requiring a negative power supply rail. It is often used in conjunction with a positive voltage regulator like the 7812 to create a dual power supply.

The IC 7808 is a positive voltage regulator with the following characteristics:

• Type: Positive Voltage Regulator
• Input Voltage (Vin): Up to 35V
• Output Voltage (Vout): +8V (fixed output)
• Output Current (Iout): Up to 1.5A
• Dropout Voltage: Typically 2V
• Package Types: TO-220, TO-3, and others
• Features: Short-circuit protection, thermal overload protection

The 7808 is used to provide a stable +8V output from a higher input voltage, making it suitable for powering devices and circuits that require a consistent 8V power supply.