Transistor BC115

Transistor BC115 NPN, 0.1A TO-106

Transistors

Reference: TRBC115

Part.No: BC115

€0.60

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The BC115 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-106 flat plastic package. A classic silicon small-signal part used for audio amplification and low-power switching in vintage and modern hobby circuits.

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Description
Product Details

BC115 Small Signal NPN Transistor - Classic TO-106 Silicon BJT

The BC115 is a silicon NPN small-signal transistor that was widely used in vintage audio and general-purpose amplifier/switching circuits before being largely superseded by TO-92 parts like the BC107/BC547 family. It still offers reliable gain and low noise for repair work, restoration projects and hobbyists who need the original TO-106 footprint.

Functions & Applications

Reliable Silicon NPN Design: Stable gain and low leakage current for consistent small-signal performance.
TO-106 Flat Package: Matches the original footprint used in vintage audio and instrumentation equipment for authentic repairs.
Good DC Current Gain: Minimum hFE of 80, suitable for amplification and general switching tasks.
Decent Switching Speed: 40 MHz transition frequency supports audio-range and moderate-frequency applications.
Legacy Replacement: Useful for restoring or servicing older Mullard/Philips-era circuit boards designed around this part.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-106
Collector-Emitter Voltage (Vceo)	30V
Collector-Base Voltage (Vcbo)	40V
Max Collector Current (Ic)	100mA
Power Dissipation (Pd)	300mW
DC Current Gain (hFE, min)	80
Transition Frequency (ft)	40MHz

Frequently Asked Questions

Q: What is a modern equivalent for the BC115 if I can't find the original TO-106 package?
A: Electrically it is comparable to the BC107/BC182 family; a BC547B in TO-92 will work in most audio or switching circuits, though you will need to re-route the pinout since the package differs.

Q: Can the BC115 drive a small LED or low-current relay directly from 5V logic?
A: Yes, its 100mA maximum collector current and hFE of at least 80 are enough for a single LED or a small relay coil; add a base resistor and, for the relay, a flyback diode.

Notes

This is a legacy/vintage part in the uncommon flat TO-106 package, mainly stocked for repair, restoration and educational use rather than new designs.

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-106

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