Transistor BFY51

Transistor BFY51 NPN, 1A TO-39

Transistors

Reference: TRBFY51

Part.No: BFY51

€0.80

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The BFY51 is a medium-power NPN Bipolar Junction Transistor (BJT) in a metal TO-39 package. Suited for general-purpose amplification and switching tasks that require more headroom than a small-signal TO-92 device.

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Description
Product Details

BFY51 Medium Power NPN Transistor - General Purpose Amplification & Switching

The BFY51 is a classic NPN medium-power transistor housed in a rugged metal TO-39 case, offering 1A collector current handling and 5W power dissipation for general-purpose designs. It is a solid choice for driving relays, small motors, or moderate-power amplifier stages where a TO-92 part would fall short.

Functions & Applications

1A Collector Current: Handles higher loads than typical small-signal TO-92 transistors.
Metal TO-39 Case: Better heat dissipation than plastic packages, improving reliability under load.
5W Power Dissipation: Suitable for moderate-power switching and amplification stages.
50MHz Transition Frequency: Usable in general-purpose RF and audio-range signal circuits.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-39
Collector-Emitter Voltage (Vceo)	30V
Collector-Base Voltage (Vcbo)	60V
Max Collector Current (Ic)	1A
Power Dissipation (Pd)	5W
DC Current Gain (hFE)	~40
Transition Frequency (fT)	50MHz

Frequently Asked Questions

Q: Can the BFY51 drive a small 12V relay or motor directly?
A: Yes, the BFY51 can switch loads up to 1A, which covers most small relays and low-power DC motors. Use a flyback diode across inductive loads to protect the transistor.

Q: Does the BFY51 need a heatsink?
A: For most general-purpose switching at moderate currents a heatsink isn't required, but if operating near the 5W power dissipation limit, adding a small heatsink to the TO-39 case improves reliability.

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-39

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