Transistor 2N5551

Transistor 2N5551 NPN, 600mA TO-92

Transistors

Reference: TR2N5551

Part.No: 2N5551

€1.20

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The 2N5551 is a high-voltage NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Designed for general-purpose amplification and switching where elevated collector-emitter voltage margin is required, such as gas-discharge display drivers and voltage-level shifting circuits.

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Description
Product Details

2N5551 High-Voltage NPN Transistor - Built for 160V Amplification & Switching

The 2N5551 is an NPN transistor engineered for applications where standard small-signal transistors fall short on voltage headroom. With a 160V collector-emitter rating and up to 600mA continuous collector current, it is widely used for level-shifting, high-voltage driver stages and general-purpose amplification in both hobbyist and professional designs.

Functions & Applications

High Voltage Rating: VCEO of 160V gives extra design margin over standard general-purpose transistors like the BC547.
Solid Current Handling: Continuous collector current up to 600mA suits relay drivers, small motors and display drivers.
Standard TO-92 Package: Through-hole, breadboard-friendly footprint that's easy to prototype and solder.
Good Gain (hFE 80-250): Reliable amplification performance across a wide range of collector currents.
Complementary PNP Available: Pairs directly with the 2N5401 for push-pull and complementary designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-92
Collector-Emitter Voltage (Vceo)	160V
Max Collector Current (Ic)	600mA
Power Dissipation (Pd)	625mW
DC Current Gain (hFE)	80 - 250
Transition Frequency (fT)	~100 MHz
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the complementary PNP part for the 2N5551?
A: The recommended complementary PNP transistor is the 2N5401, which shares similar high-voltage ratings.

Q: Can the 2N5551 replace a BC547 in a design needing more voltage headroom?
A: Yes, the 2N5551 has the same TO-92 package and NPN polarity, but offers a much higher 160V VCEO rating and up to 600mA collector current, making it suitable for higher-voltage circuits than the BC547 (45V, 100mA).

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: NPN
Transistor Case Style: TO-92

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