Transistor S8550

Transistor S8550 PNP, 1.5A TO-92

Transistors

Reference: TRS8550

Part.No: S8550

€1.00

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The S8550 is a PNP Bipolar Junction Transistor (BJT) in a TO-92 package, complementary to the popular S8050 NPN. Designed for class-B push-pull audio output stages, general amplification and medium-current switching in portable and battery-powered circuits.

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Description
Product Details

S8550 PNP Transistor - High Gain for Push-Pull Audio & Switching

The S8550 is a PNP epitaxial silicon transistor housed in a TO-92 package, most often used as the PNP half of a class-B push-pull output stage alongside its NPN complement, the S8050. It offers high current gain and low saturation voltage, making it a solid choice for low-power audio amplifiers, DC motor/LED driver circuits and general-purpose switching in hobbyist and student projects.

Functions & Applications

High Current Gain (hFE): Typically 85-300, suitable for efficient signal amplification and driving loads directly from low base currents.
Complementary to S8050: Pairs perfectly with the S8050 NPN for class-B push-pull output stages in audio amplifiers.
TO-92 Package: Through-hole design that's easy to solder, ideal for breadboarding and prototyping.
Medium Current Capability: Handles collector currents suitable for small motors, relays, LED arrays and buzzer circuits.
Low Saturation Voltage: Reduces power loss when used as a switch, improving efficiency in battery-powered designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	PNP
Package / Case	TO-92
Collector-Base Voltage (Vcbo)	40V
Collector-Emitter Voltage (Vceo)	25V
Max Collector Current (Ic)	1.5A
Power Dissipation (Pd)	1W
DC Current Gain (hFE)	85-300
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the complementary NPN transistor for the S8550?
A: The complementary NPN transistor is the S8050, widely used together in class-B push-pull audio output stages.

Q: How much current can the S8550 safely switch?
A: It can handle up to 1.5A peak collector current, but for continuous operation in a TO-92 package it's best kept well below this (a few hundred mA) to stay within the ~1W power dissipation limit and avoid overheating.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: PNP
Transistor Case Style: TO-92

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