BC549 Datasheet PDF – 30V, 100mA, NPN Transistor

This is one of the most commonly used NPN transistor types.

Part Number: BC549

Function: 30V, 100mA, NPN Transistor

Package: TO-92 Type

Manufacturer: ON Semiconductor

For additional details, please refer to the preview image and the accompanying PDF file.


BC549 npn transistor

What is BC549?

This is a maximum voltage rating of 30V and a maximum current rating of 100mA, NPN general-purpose transistors in small plastic packages. It is widely used in applications such as signal amplification, switching, and oscillator circuits.

The BC549 is a general-purpose NPN bipolar junction transistor (BJT) that is commonly used in electronic circuits due to its low cost and wide availability.



0. Switching and Amplifier

1. Low current

2. Low voltage

3. Three different gain selections


1. It is a versatile transistor that can be used in a wide range of general-purpose applications.

2. It has a low collector-emitter saturation voltage, which reduces power loss and improves efficiency.

3. Its small TO-92 package makes it easy to use and suitable for applications where space is limited.


1. It is designed for low-power applications and may not be suitable for high-power circuits.

2. Its maximum current rating of 100mA may be too low for some applications.

Absolute maximum ratings ( Ta=25°C )

1. Collector to Base Voltage: Vcbo = 30 V

2. Collector to Emitter Voltage: Vceo = 30 V

3. Emitter to Base Voltage: Vebo = 5 V

4. Collector Current: Ic = 100 mA

5. Collector Power Dissipation : Pc = 500 mW

6. Junction Temperature: Tj = 150°C

7. Storage Temperature: Tsg = -65 ~ +150°C


1. General-purpose switching and amplification


Q1: What is the difference between the BC547 and BC549 transistors?

A1: The BC549 is similar to the BC547 in many ways, but it has a lower voltage rating of 30V compared to the BC547’s 45V rating. Additionally, the BC549 is typically used in low-power applications, while the BC547 can be used in both low-power and medium-power circuits.


Other data sheets are available within the file: BC546, BC547, BC548, BC550

BC549 Datasheet PDF

BC847 pdf

Recommended NPN transistor

  • 2N3904: This is a 40V, 0.2A, NPN transistor
  • BC547: It is 45V, 100mA, General-purpose NPN transistor
  • BC337: This is 45V 50mA, NPN transistor
  • PN2222: It’s 30V, 600mA, General-purpose NPN transistor
  • BC548: This is 30V, 100mA, NPN transistor

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74HC02 Datasheet PDF – Quad 2-input NOR gate – NXP

Part Number: 74HC02, 74HC02D

Function:  Quad 2-input NOR gate

Package: SO14, SSOP14, TSSOP14, DHVQFN14 type

Manufacturer: NXP





The 74HC02, 74HCT02 is a quad 2-input NOR gate. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

A quad 2-input NOR gate is a digital logic gate that contains four individual NOR gates, with each gate having two input signals and one output signal. The output of each NOR gate is the logical NOR operation of its two input signals.

General Specifications:

1. The gate consists of four individual 2-input NOR gates.

2. Each 2-input NOR gate has two input signals, labeled A and B, and one output signal, labeled Y.

3. For each 2-input NOR gate, the inputs A and B are connected to the corresponding input pins.

4. The output of each NOR gate is the logical NOR operation of its two input signals (Y = A NOR B).

5. The output pins of the four NOR gates are labeled Y1, Y2, Y3, and Y4, respectively, representing the outputs of the quad 2-input NOR gate.




1. Input levels:
(1) For 74HC02: CMOS level
(2) For 74HCT02: TTL level

2. Complies with JEDEC standard no. 7A

3. ESD protection:
(1) HBM JESD22-A114F exceeds 2000 V
(2) MM JESD22-A115-A exceeds 200 V

4. Multiple package options

Logic Symbol:



Official Homepage: https://www.nxp.com/products/discretes-and-logic/logic/74HC02

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