Understanding 2SC2705 Transistor Pinout, Equivalents, Features, Applications and Other Details

2SC2705 also known as C2705 is an NPN transistor made to be used in high frequency and audio amplifier applications. In this article we will understand its pinout, equivalents, features, applications and other details.

 

 

Absolute Maximum Ratings:

• Package Type: TO-92L Or TO-92MOD
• Transistor Type:  NPN
• Max Collector Current(I_C): 50mA
• Max Collector-Emitter Voltage (V_CEO): 150V
• Max Collector-Base Voltage (V_CBO): 150V
• Max Emitter-Base Voltage (V_EBO): 5V
• Max Collector Power Dissipation (P_C): 800mW
• Max Transition Frequency (f_T): 200 MHz (TYP)
• Minimum & Maximum DC Current Gain (h_FE): 80 – 240
• Max Storage & Operating temperature Should Be: -55 to +150 Centigrade

 

PNP Complementary:

The PNP complimentary of 2SC2705 is 2SA1145

 

Replacement and Equivalent:

BF422, 2SC3468, 2SC3228, 2SC2383, 2SD2213, 2SD1659

 

2SC2705 Transistor Explained / Description:

2SC2705 is a TO-92L package NPN transistor designed to be used in high frequency and audio amplifier applications. The key features of the transistor are high collector-emitter voltage, high collector-base voltage, high transition frequency, power dissipation value of up to 800mW, low collector output capacitance, good DC current gain, and availability of complementary pair. All these features make this transistor a robust device that can reliably be used in a variety of applications.

Understanding the absolute maximum ratings of the transistor, the collector-emitter voltage is 150V, collector-base voltage is also 150V, collector current is 50mA, emitter-base voltage is 5V, base current is 5mA, collector power dissipation is 800mW, junction temperature is 150°C and storage temperature is from -55°C to 150°C.

This transistor is manufactured in two different gain types, and each one can be determined by the alphabet written after the part number. The alphabet “O” indicates the gain value from 80-160 and the alphabet “Y” indicates a gain value of 120 to 240.

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How to Use Transistor:

To use the transistor as an amplifier we have to wire it in common emitter mode. The signals which you want to amplify will be applied to the base of the transistor through a filter capacitor of any value between 1uF to 10uF, the emitter pin of the transistor will be connected with the negative rail of circuit and a resistor between emitter and ground is connected to improve thermal stability. The collector pin will be connected with the positive rail of the supply and a load resistor will be used between these two points and the amplified output will be received at the collector pin. This is a basic circuit of an amplifier to make a good amplifier circuit some other passive components will be required.

To use the transistor as a switch is not very difficult, for doing so connect the emitter pin with the negative rail of the circuit, apply signals which you want to amplify through a current limiting resistor to the base of the transistor and drive load through collector.

 

Applications:

Audio Amplifiers

Preamplifier Circuits

Switching applications

RF Circuits

General Purpose Applications

 

Safe Operating Guidelines:

Do not use the transistor to its absolute maximum ratings and always stay 20% below from these ratings. For example the max collector-emitter voltage is 150V but we will not drive load of more than 120V. The maximum collector current is 50mA but we will not drive load of more than 40mA. Pin configuration will always be checked before use and storage and operating temperature should be between -55°C to 150°C.

 

Datasheet:

To download the datasheet just copy and paste the below link in your browser.

https://www.mouser.com/datasheet/2/408/Toshiba_2SC2705-O%20(TE6,F,M)-1209612.pdf