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BC557

  • Available: 13269

Reference Price(In US Dollars)

QtyUnit PriceExt.Price
1+US $0.15000US $0.15
10+US $0.10000US $1.00
30+US $0.07500US $2.25
100+US $0.06000US $6.00
500+US $0.05500US $27.50
1000+US $0.05000US $50.00

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  • Description
  • Alternatives
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Description

The BC557 is a PNP bipolar junction transistor (BJT) manufactured by ON Semiconductor, designed for general-purpose amplification and switching applications. It is commonly used in low-power applications due to its favorable characteristics.

Key Features:

  1. Type: PNP Transistor
  2. Package Type: Typically available in a TO-92 package, which is a cylindrical plastic package with three leads. This makes it suitable for through-hole mounting on printed circuit boards (PCBs).
  3. Maximum Collector-Emitter Voltage (Vce): The BC557 can handle a maximum Vce of around -45V, making it suitable for various applications where moderate voltage levels are present.
  4. Maximum Collector Current (Ic): The transistor can handle a maximum collector current of approximately -100mA, which is adequate for many low-power applications.
  5. DC Current Gain (hFE): The BC557 has a current gain (hFE) ranging from 100 to 600, depending on the specific model and operating conditions. This high gain allows for effective amplification of weak signals.
  6. Transition Frequency (fT): The transition frequency is typically around 100 MHz, indicating the frequency range over which the transistor can operate effectively.
  7. Thermal Resistance: The thermal resistance junction-to-ambient is relatively low, allowing for efficient heat dissipation during operation.

Electrical Characteristics:

  • Emitter-Base Voltage (Veb): The maximum reverse voltage that can be applied to the emitter-base junction is around -5V.
  • Power Dissipation (Pd): The maximum power dissipation is typically around 500 mW, which is important for ensuring the transistor operates within safe limits without overheating.

Applications:

The BC557 is widely used in various applications, including:

  • Signal Amplification: It is often used in audio and radio frequency amplification circuits.
  • Switching: The transistor can be used as a switch in low-power applications, controlling larger loads with a small input signal.
  • Inverter Circuits: It is commonly found in inverter circuits for converting DC to AC.
  • Level Shifting: The BC557 can be used in level shifting applications where signal levels need to be adjusted.

Characteristics:

  • Polarity: Being a PNP transistor, it conducts when the base is pulled low relative to the emitter.
  • Temperature Range: The BC557 operates effectively over a wide temperature range, typically from -55°C to +150°C, making it suitable for various environmental conditions.

Conclusion:

The BC557 from ON Semiconductor is a versatile and reliable PNP transistor that is well-suited for a variety of electronic applications. Its combination of moderate voltage and current ratings, along with high gain and frequency response, makes it a popular choice among engineers and hobbyists alike.

Alternatives

Functional Equivalent (FE) materials, including Fused Filament Fabrication (FFF) form, assembly, and functionally compatible substitute materials.

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