What is BC109?


This is NPN general purpose transistors.

A NPN transistor is a type of bipolar junction transistor (BJT) that consists of two p-type semiconductor materials separated by a single n-type material.
The NPN transistor is used to amplify or switch electronic signals and is widely used in many electronic circuits. It works by controlling the current flow between the collector and emitter terminals through the base terminal.


[PDF] Complete Technical Details can be found in the BC109 datasheet provided at this page.

Summary in PDF File


DISCRETE SEMICONDUCTORS DATA SHEET M3D125 BC107 BC108 BC109 NPN general purpose transistors Product speci cation Supersedes data of 1997 Jun 03 File under Discrete Semiconductors SC04 1997 Sep 03 Philips Semiconductors Product speci cation NPN general purpose transistors FEATURES Low current max 100 mA Low voltage max 45 V APPLICATIONS General purpose switching and amplification DESCRIPTION NPN transistor in a TO 18 SOT18 metal package PNP complement BC177 3 BC107 BC108 BC109 PINNING PIN 1 2 3 emitter base collector connected to the case DESCRIPTION handbook halfpage 1 3 2 MAM264 2 1 Fig 1 Simplified outline TO 18 SOT18 and symbol QUICK REFERENCE DATA SYMBOL VCBO PARAMETER collector base voltage BC107 BC108 BC109 VCEO collector emitter voltage BC107 BC108 BC109 ICM Ptot hFE peak collector current total power dissipation DC current gain BC107 BC108 BC109 fT transition frequency IC 10 mA VCE 5 V f 100 MHz Tamb 25 C IC 2 mA VCE 5 V 110 110 200 100 450 800 800 MHz open base 45 20 200 300 V V mA mW open emitter 50 30 V V CONDITIONS MIN MAX UNIT 1997 Sep 03 2 Philips Semiconductors Product speci cation NPN general purpose transistors LIMITING VALUES In acco

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[ Detailed Data ]

Characteristics of NPN Transistors

1. Bipolar Junction: NPN transistors are bipolar junction transistors (BJT), meaning they have a structure consisting of three regions of alternating P-type and N-type semiconductors.

2. Current Amplification: NPN transistors are designed to amplify electrical current, and can be used in a wide range of electronic applications such as amplifiers, switches, and oscillators.

3. Forward Biased: In order to operate, the base-emitter junction of an NPN transistor must be forward biased, meaning that the base must be connected to a positive voltage relative to the emitter.

4. High Input Impedance: NPN transistors have a high input impedance, which means that they are less likely to draw current from the input source, and are therefore less likely to cause a drop in voltage across the source.

5. Inverted Output: NPN transistors are known for producing an inverted output relative to their input.

Manufacturers : NXP Semiconductors

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