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2N5551 Transistor: Pinout, Features, Datasheet [Video]

Author: Iggy Date: 13 Jan 2021  84

2N5551 is a NPN Amplifier Transistor.

It is designed for general purpose applications so that it can be used for amplification and switching.

The maximum voltage from the collector to the emitter is 160V and the maximum voltage from the collector to the base is 180V, making it easy to use in circuits with a voltage below 160V.The maximum output load that this transistor can handle is 600mA and the maximum power consumption of the collector is 625mW.

This blog provides you with a basic overview of the 2N5551 transistor, including its pin descriptions, functions, applications, similar products, etc., to help you quickly understand what 2N5551 is.

We will be glad to find that this blog can be useful for people loving electronic components ;)

If you want to know more details about 2N5551 and its similarities 2N5451...

Catalog

2N5551 Transistors Pinout

2N5551 Transistors Feature

2N5551 Transistor Alternative

2N5551 Transistor Equivalent

2N5551 Transistor Similarities

Where to use 2N5551

How to use 2N5551

2N5551 Transistor Application

2N5551 Transistor Package

Component Datasheet


2N5551 Transistors Pinout

2N5551 has three pins, the same as any other transistor, namely Emitter, Base and Collector.

Pin Number Pin Name Description
1 Emitter Current Drains out through emitter, normally connected to ground
2 Base Controls the biasing of transistor, Used to turn ON or OFF the transistor
3 Collector Current flows in through collector, normally connected to load

2N5551 Transistors Feature

  • Amplifier NPN Transistor
  • High DC Current Gain (hFE), typically 80 when IC=10mA
  • Continuous Collector current (IC) is 600mA
  • Collector-Emitter voltage (VCE) is 160 V
  • Collector-Base voltage (VCB) is 180V
  • Emitter Base Voltage (VBE) is 6V
  • Transition Frequency is 100MHz
  • Available in To-92 Package

Note: Complete Technical Details can be found at the 2N5551 datasheet given at the end of this page.


2N5551 Transistor Alternative

2N2369, 2N3055, 2N3904, 2N3906, 2SC5200, BC549, BC636, BC639, BC547,


2N5551 Transistor Equivalent

2N5088, 2N3055, NTE194, 2N5833, 2N5401 (PNP)


2N5551 Transistor Similarities

2N5550


Where to use 2N5551

The 2N5551 is a transistor NPN amplifier with an amplification factor (hfe) of 80 when the collector current is 10mA. It also has decent switching characteristics (transition frequency is 100MHz) so low-level signals can be amplified.

Due to this feature, the transistor is commonly used to amplify audio or other low-power signals. So if you're looking for an NPN transistor for an amplifier circuit, this transistor might be the right choice.


How to use 2N5551

As stated earlier, the 2N5551 NPN transistor is widely used for amplification. A very simple bare minimum circuit for the transistor to operate as an amplifier is shown below. The simulation graph showing the amplified sine wave output can also be found.

How to use 2N5551

Here the input sine wave of magnitude 8mV (yellow color) is amplified to 50mV (pink color) as shown in the graph. In the circuit referred to above, the resistors R3 and R4 form a potential divider that determines the output-base voltage (VBE). The R1 resistor is the load resistor and the R2 resistor is the emitter resistor. Changing the value of the RL will affect the output wave amplification.

A transistor is normally a current amplifier, which means the current flowing though the base will be amplified in the current flowing through the collector. This amplification depends on the amplification factor (hfe) of 80 for 2N5551. This means that the collector current will be amplified by 80 times that of the base current.

Ic = βIb

Another current that we have taken into account is the emitter current (IE), but due to the transistor action, we assume that the emitter current is almost equal to the Collector current value, although the difference between the two can be found with the value of 5-007. Normally, the value of the current collector is given by e:

IE = IC + IB

The output is obtained through the collector, which is the Collector-Emitter voltage (VCE). This output voltage depends on the input voltage (Vcc, here 12V) without the voltage drop over the load resistor (R1). The output voltage Vout can therefore be specified as

Vout = VCE = (Vcc – IcRc)


2N5551 Transistor Application

  • Low power amplifiers
  • Current amplifiers
  • Small signal boosters
  • Audio or other signal amplifiers
  • Darlington pair

2N5551 Transistor Package

If you are designing a PCD or Perf board with this component, the following picture from the 2N5551 Datasheet will be useful to know its package type and dimensions.

2N5551 Transistor Package: Bent Lead

2N5551 Transistor Package: Straight Lead


That’s all for our introduction to 2N5551. If you find this blog useful, please bookmark our website Apogeeweb, we will provide you with electronic component blogs, industry news, tools, etc. that you are interested in. Stay tuned for our next blog...

Component Datasheet

2N5551 Datasheet

 

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
2N5551BU 2N5551BU Company:ON Semiconductor Remark:TRANS NPN 160V 0.6A TO-92 Package:TO-226-3, TO-92-3 (TO-226AA)
DataSheet
In Stock:3865
Inquiry
Price:
1+: $0.28000
10+: $0.22800
25+: $0.19080
100+: $0.09330
500+: $0.07780
1000+: $0.05406
2500+: $0.05024
5000+: $0.04346
9000+: $0.03604
Inquiry
2N5551TA 2N5551TA Company:ON Semiconductor Remark:TRANS NPN 160V 0.6A TO-92 Package:TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
DataSheet
In Stock:6000
Inquiry
Price:
2000+: $0.05025
6000+: $0.04346
10000+: $0.03604
50000+: $0.03180
Inquiry

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