2SC1345 NPN Amplifier Transistor

17 June 2019 - 0 Comments

2SC1345 NPN Amplifier Transistor

2SC1345 Pinout

The 2SC1345 is a low signal NPN amplifier transistor with a collector to emitter voltage of 50V and collector current of 100mA. The Transistor has a high gain value from 250 to 1200 making it suitable for amplifier designs.

Pin Configuration

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

Features

Low noise amplifier NPN Transistor
Current Gain (hFE) is 250 to 1200
Continuous Collector current (IC) is 100mA
Collector-Emitter voltage (VCEO) is 50 V
Collector-Base voltage (VCB0) is 550V
Emitter Base Voltage (VBE0) is 5V
Available only in To-92 Package

Note: Complete Technical Details can be found at the 2SC1345 datasheet given at the end of this page.

Modern Replacement for 2SC1345: KSC1845FTA (Fairchild), 2SC2240

Other NPN amplifier Transistors: NTE123AP, MPS06, BC337, 2SC2879, 2N5551

About 2SC1345 transistors

The 2SC1345/2SC1344 is a vintage transistor from China that was popularly used in audio equipments long time back. The 2SC1345 Transistor is known for is low noise capability and high gain feature. It has a collector current of 100mA and collector to emitter voltage of 50V hence cannot be used in high power audio designs. The transistor also has a very low Base voltage of 5V which makes it suitable for low voltage audio amplifiers or pre-amplifiers. The gain value of the transistor depends on the part number of the transistor; the following table will help you identify the gain value of your transistor.

Part Number	Gain Value (hfe)
2SC1345D	250 to 500
2SC1345E	400 to 800
2SC1345F	600 to 1200

Other than using as a amplifier, the transistor can also be used as low power switch. When used as a switch it can easily by controlled by a MCU/MPU since it has a base voltage of only 5V. It can switch loads upto 50V but has a very low collector current rating of only 100mA so this transistor is not really a good choice to be used as a switch. A better alternative for switching applications will be 2N2222.

However this transistor is outdated and will not be easily available if you are in Asian or European countries. In that case you can try the 2SC2240 transistor from Toshiba semiconductors. The 2SC1345 also has reported problem with producing a hissing noise in audio circuits when they get old, so if you are designing a new circuit it is recommended to try other improved amplifier transistor which have been released in recent times.