2N3866 transistor

2N3866 transistor
2N3866 transistor

2N3866 transistor specification

  • 2N3866 is an NPN silicon HIGH-frequency transistor device
  • Collector to emitter voltage is 30V
  • Collector to base voltage is 55V
  • Emitter to base voltage is 5V
  • Collector current is 400mA
  • Output power is 1W
  • DC current gain is 5 to 200hFE
  • Junction temperature & operating temperature is between -55 to +150℃
  • Collector to emitter saturation voltage (VCE (SAT)) is 1V
  • Transition frequency (TF) is 500 to 800MHz
  • Output capacitance is 8 to 3.5pF
  • Low power transistor
  • RF & microwave discrete
  • VHF/UHF transistor
  • 800MHz current gain bandwidth


Pin Number Pin Name Description
1 Emitter  Current flows through the emitter
2 Base Base terminal is used to trigger the transistor device
3 Collector Current flows through the collector and it is connected with the case of the package.


2N3866 package

2N3866 HIGH-frequency transistor device has a TO-39 METAL CAN package, the outer covering is made with the metal cover which acts as the heat sink of this device.

TO-39 is a three-terminal metal-covered device package, 2N3866 transistors are mainly used for amplifier applications, so compactness for the component is important.

2N3866 transistor electrical specification description & application note:

In this section we explain the electrical specifications of the 2N3866 transistor, this explanation is very useful for the replacement process and circuit-making process, which is very useful for a better understanding of the device.

Voltage specs

The voltage specifications of the 2N3866 transistor are a collector-to-emitter voltage is 30V, a collector-to-base voltage is 55V, and emitter to base voltage is 3.5V, which is the terminal voltage value.

The collector-to-emitter saturation voltage value of the 2N3866 transistor is 1V, it is the switching value of the transistor.

The voltage specs show it is a medium voltage device that had more audio-based applications.

Current specs

The collector current value of the 2N3866 transistor is 400Ma, and the current value of the transistor indicates the load capacity.

Current gain specs

The DC current gain value of the 2N3866 transistor is 5 to 200MHz, this value is important for amplifier and oscillator applications.

Transition frequency

The 2N3866 transistor had a transition frequency value between 500 to 800MHz, it is a very important spec for some application circuits.

Output capacitance

The output capacitance value of the 2N3866 transistor is 2.8 to 3.5pf

Output power

The output power value of the 2N3866 transistor is 1W


If you need the datasheet in pdf please click this link

2N3866 equivalent

2N3866 transistor have equivalent devices such as 2N4427, TA2658, 2N5000 and BFW47, each of them have same set of electrical specifications.

For amplifier and frequency-based applications, circuits have important specs such as voltage, current and frequency values, so we need to check and verify those specs at these transistors before the replacement process.

2N3866 vs 2N4427

In the table below we list and compare the electrical specifications of 2N3866 and 2N4427 transistors, this comparison is very useful for circuit-making and replacement processes.

Collector to base voltage (VCB)     55V40V
Collector to emitter voltage (VCE)30V20V
Emitter to base voltage (VEB)3.5V2V
Collector to emitter saturation voltage (VCE (SAT))1V0.5V
Collector current (IC)400mA400mA
Output power1W1W
Junction temperature (TJ)-55 to +150°C-65 to +150°C
Output capacitance2.8 to 3.5pF4pF
Transition frequency    500 to 800MHz500MHz
Gain (hFE) 5 to 200hFE10 to 200hFE

Characteristics curves of 2N3866 transistor

output power vs input power characteristics of the 2N3866
output power vs input power characteristics of the 2N3866

The figure shows the output power vs input power characteristics of the 2N3866 transistor, the graph plots output power vs input power.

At a constant frequency value, the curve plots at three different collector-to-emitter voltage values.

The power increases from zero to a higher value and after a certain point, the power becomes constant.

2N3866 applications

  • VHF/UHF equivalent applications
  • Pre driver applications
  • Output stage amplifier circuit
  • Oscillator circuit applications
  • Frequency multiplier circuit applications

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