S8550 Transistor PNP 20V 700mA 1000mW TO-92

S8550 Transistor PNP 20V 700mA 1000mW TO-92 is a high-current, general-purpose silicon epitaxial planar PNP transistor designed for switching and amplification tasks in various electronic circuits. This versatile component manages a significant collector current of up to 700mA, which allows it to drive medium-power loads effectively. Consequently, it serves as an ideal choice for engineers looking for a more powerful alternative to standard small-signal transistors like the BC557. Furthermore, its high power dissipation capability of 1000mW ensures stable performance under demanding conditions. Therefore, you can reliably integrate the S8550 into your projects to control relays, motors, and high-intensity LEDs with ease.

Key Features:

• High Collector Current: The device handles up to 700mA of continuous collector current, making it suitable for driving small motors and relays.
• Excellent Linearity: It provides a consistent gain across its operating range, ensuring accurate signal amplification in audio and sensor circuits.
• Compact TO-92 Package: The industry-standard through-hole package allows for easy soldering and integration into breadboards or printed circuit boards.
• High Power Dissipation: With a 1W (1000mW) rating, this transistor manages heat more effectively than typical low-power PNP variants.
• Complementary Pair: This transistor functions as the perfect PNP complement to the S8050 NPN transistor for push-pull amplifier configurations.

Technical Specifications:

• Transistor Polarity: PNP
• Collector-Base Voltage (V_CBO): −40 V
• Collector-Emitter Voltage (V_CEO): −25 V
• Emitter-Base Voltage (V_EBO): −5 V
• Continuous Collector Current (I_C): −700 mA
• Collector Power Dissipation (P_C): 1 W (1000 mW)
• DC Current Gain (h_FE): 85 to 300
• Transition Frequency (f_T): 100 MHz minimum

Mechanical Specifications:

• Package Type: TO-92-3 (Plastic-Encapsulate Transistor)
• Lead Finish: Tinned leads for easy soldering
• Weight: ≈ 0.18 g
• Mounting Type: Through-hole (PCB/Breadboard)

Dimensions:

• Body Height: ≈ 4.7 mm
• Body Width (Diameter): ≈ 4.7 mm
• Body Thickness: ≈ 3.8 mm
• Lead Length: ≈ 13.5 mm to 15.0 mm
• Lead Pitch: ≈ 1.27 mm

Pinout and Wiring:

• Pin 1 (Emitter): Connect this pin to the positive supply rail in a typical switching circuit.
• Pin 2 (Base): Apply a negative trigger current relative to the emitter to turn the transistor “ON”.
• Pin 3 (Collector): Connect this pin to the load you wish to control.
• Wiring Note: However, always verify the pinout with a multimeter before installation, as some manufacturers may use a different sequence for specific variants.

Datasheet Reference:

• Download S8550 PNP Transistor Datasheet

Commonly Used in:

• Switching Circuits: Controlling small DC loads like buzzers, solenoids, and indicators from a microcontroller GPIO.
• Class B Amplifiers: Operating as part of a push-pull output stage alongside the S8050 NPN transistor.
• Voltage Regulators: Serving as a pass element in low-current linear power supply designs.

Applications:

• Load Switching: Efficiently toggling power to peripherals in battery-operated gadgets.
• Signal Inversion: Inverting logic signals for compatibility between different circuit stages.
• Pre-amplifier Stages: Providing low-noise amplification for audio and RF applications.

Equivalent Models:

• SS8550: A higher current version of the same series often capable of 1.5A.
• BC327: A widely available PNP transistor with similar voltage and current ratings.
• 2N2907: A rugged PNP alternative, although it typically comes in a metal can or different plastic package.

Package Includes:

• 1 x S8550 Transistor PNP 20V 700mA 1000mW TO-92