C945 Transistor: Features, Pinout, Equivalent - Easybom

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Anita · May 05,2022C945 Transistor: Features, Pinout, EquivalentElectronic Component Parts Articles

C945 Transistor Introduction

C945 is an NPN bipolar junction transistor. It is composed of three regions: emitter, collector, and base. The base is doped with P semi-conductor type material. The collector and emitter are both coated with N-type semiconducting material. It's a low-cost gadget and is extremely popular on the market because of its wide array of applications. Its functions include fast switching amplifying, low-power electronic circuits, and many more.

C945 Transistor

Today, easybom will introduce the details about it. This article will be divided into below parts: C945 Features, C945 Pinout, C945 Equivalent, and so on.

C945 Features

The current Gain is 70 to 700

The continuous current of the Collector is 150mA

The voltage of the Collector-Emitter is 50 V

The voltage of the Collector-Base is 60V

The voltage of the Emitter Base is 5V

The transition frequency is 150MHz

C945 Pinout

Below is the C945 Pinout:

C945 Pinout

C945 Specifications

Physical

Package / Case - SOT-23(SOT-23-3)

Technical

Transistor Type - NPN

Where to Use C945 Transistor?

The C945 transistor is a low-cost gadget and is extremely popular on the market because of its wide array of applications. It is widely employed in transistors for pre-amplifying purposes, as well as in high-frequency circuits.

C945 Equivalent

You could use BC546, C1815, and KSC945C as C945 equivalent. You could find them on easybom.

Beware Attention: The C945 is a Japanese NPN transistor, therefore, its C945 pinouts will fall in Emitter, Collector, and Base order. However, for European transistors such as BC546, the sequence will be Emitter, Base, and Collector. In the normal course of replacements, the heat shrink tube is utilized to connect the collector and base pins, but without them being in contact.

Everything You Need to Know About C945 in Electronics

The C945 is an old Japanese Bipolar audio frequency NPN transistor. It has a high gains value (hfe) of up to 700 and is very linear. Therefore, it is widely employed in Transistors for pre amplifying purposes, as well as in high-frequency circuits. It also functions as an oscillator in conjunction with the A733 transistor.

If it is used as a switch it is easily controlled by an MCU/MPU as it is equipped with an operating voltage of 5V. It is capable of switching loads up to 50V, but it has a low current limit of just 150mA, so it is not an ideal choice for being employed as a switch. An alternative to using to switch applications is 2N2222.

But this transistor is not as modern and is not readily accessible for those living located in Asian or European countries. In this case, you may attempt the 2N3904 transistor manufactured by ON semiconductors. However, make sure you follow the pinouts that are mentioned in the previous section about the beware attention.

C945

How to Safely Long Run in a Circuit:

To ensure the long-term effectiveness of this transistor, it is advised not to drive the load to more than 150mA when using this transistor. We could operate it under the maximum collector-emitter voltage. We could make use of a base resistor to supply the required base current to the transistor. Do not operate or store the transistor at temperatures below -55 Celsius or above 150 centigrade.

C945 Application

Low current switches

Pre-Transistors

H-bridge circuits for low power motors

Audio frequency Transistor circuits

Oscillator circuits

C945 Package Dimensions

Below is the picture of the 2D Model and Dimensions that will be useful to know the package type and dimensions.

C945 Package Dimensions

Conclusion

In brief, the C945 is a low-cost gadget and is extremely popular on the market because of its wide array of applications. It is widely employed in Transistors for pre amplifying purposes, as well as in high-frequency circuits. Hope the above information could help you!

labelsC945Access: 8587 Anita

Anita

Anita is a skilled electronics engineer with expertise in analog and digital circuit design. She is constantly seeking new challenges and opportunities to learn and grow in her career and is committed to delivering high-quality and reliable solutions to her clients.

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