BC490A

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Transistor Type:	PNP
Current - Collector (Ic) (Max):	1A
Voltage - Collector Emitter Breakdown (Max):	80V
Vce Saturation (Max) @ Ib, Ic:	500mV @ 100mA, 1A
Current - Collector Cutoff (Max):	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce:	100 @ 100mA, 2V
Power - Max:	625mW
Frequency - Transition:	150MHz
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3
Base Part Number:	BC490

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Introduction

The BC490A series of single, bipolar junction transistor (BJT) devices are usually described as general-purpose transistors. They are designed to work under a wide variety of applications and use cases. In this article, we will explore the BC490A\'s application fields and working principles to better understand how it can be applied.

General Description

The BC490A series of bipolar junction transistors are typically found in 3-lead packages. They are used for low to medium power (up to 500 mW) switching, amplifying and level-shifting applications. The BC490A is ideally suited for use in small signal circuits.

Features

The BC490A is an NPN device with a transition frequency of 1 MHz and a maximum gain of 500. The maximum collector-base breakdown voltage (VCBO) is 60V. It has an SPICE Model Number of BC490A. It is also available in both surface mount and through-hole packages which make it a versatile component for prototyping and production demands.

Advantages

The BC490A transistor has several advantages. These include:

• Its compatible with most breadboard and prototyping projects;
• High performance due to its low noise and high gain;
• High stability of operation due to its low leak factor;
• Low VBE (Base-Emitter) saturation voltage, making it suitable for level-shifting applications;
• High switching speed with a transition frequency of 1MHz;
• It can handle up to 500mW of power.

Applications

The BC490A transistor can be used in a number of applications due to its features and advantages. These include:

• Switching applications, such as relays and power converters;
• Level-shifting applications, such as voltage regulators and voltage multipliers;
• Amplification applications, such as audio amplifiers and radio receivers.

Working Principle

The BC490A device works on the principle of a two-resistor current mirror. This is a circuit configuration where current passes through two resistors of the same value and the difference in voltage is amplified between the two resistors.The BC490A works like a long-tailed pair amplifier design. It has three main components: the bases of the two transistors which form the “long tail”, the collector resistors and the small signal gain stage.The long tails are connected to the collector, and then current is passed through the two resistors of the same value. This creates a voltage drop between the two resistors and this difference is amplified by the small signal gain stage.The collector resistors are usually matched to the base-emitter junction of the transistors, so the current mirror effect can be achieved. The two transistors form an important part of the current mirror effect, as they control the voltage gain of the device and guarantee the current stability over temperature and supply condition changes.

Conclusion

The BC490A is a versatile single, bipolar junction transistor device which can be used for a range of low to medium power applications, including switching, amplifying and level-shifting applications. Its features and advantages make it ideal for use in prototyping and production sets, plus it has a high switching speed and low VBE saturation voltage. It works on the principle of a current mirror and has three main components: the two transistors, the collector resistors and the small-signal gain stage.

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