on November 15th 66

BC556B Transistor: A Versatile PNP Component

The BC556B is a small but powerful transistor used for amplifying signals and controlling small loads in electronic circuits. In this guide, you'll learn about its features, uses, and how it can be applied to different projects.

Catalog

Overview of BC556B

BC556B is a versatile transistor packaged in a TO-92 plastic casing. Its design makes it suitable for a variety of switching and amplification tasks. With the ability to handle a collector-emitter voltage of up to -65V and a maximum current of 100mA, it is well-suited for low-power applications in electronic circuits. The transistor's high current gain range, between 110 and 800, further enhances its usability in signal amplification and audio pre-amplification. Whether you’re working on general-purpose circuits or more specific projects, BC556B offers reliability and efficiency.

BC556B Pin Configuration

BC556B is enclosed in a TO-92 plastic casing, making it compact and easy to integrate into circuits. The three leads—collector, base, and emitter—are arranged from left to right when the flat side of the transistor is facing you with the leads pointing downward. This straightforward configuration helps simplify its placement and connections in various applications.

BC556B CAD Model

BC556B Symbol

BC556B Footprint

BC556B 3D Model

BC556B Specifications

Technical specifications, features, characteristics, and components with comparable specifications of ON Semiconductor BC556B.

Type	Parameter
Factory Lead Time	6 Weeks
Contact Plating	Tin
Mount	Surface Mount, Through Hole
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Number of Pins	3
Weight	240.007063mg
Transistor Element Material	SILICON
Collector-Emitter Breakdown Voltage	65V
Number of Elements	1
hFEMin	110
Operating Temperature	150°C TJ
Packaging	Tape & Box (TB)
Published	2007
JESD-609 Code	e3
Pbfree Code	yes
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	3
ECCN Code	EAR99
Voltage - Rated DC	-65V
Max Power Dissipation	500mW
Terminal Position	BOTTOM
Current Rating	-100mA
Frequency	150MHz
Base Part Number	BC556
Voltage	65V
Element Configuration	Single
Current	1A
Power Dissipation	500mW
Transistor Application	SWITCHING
Gain Bandwidth Product	150MHz
Polarity/Channel Type	PNP
Transistor Type	PNP
Collector Emitter Voltage (VCEO)	65V
Max Collector Current	100mA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA 5V
Current - Collector Cutoff (Max)	15nA ICBO
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA
Transition Frequency	150MHz
Max Breakdown Voltage	65V
Collector Base Voltage (VCBO)	80V
Emitter Base Voltage (VEBO)	5V
Height	4.58mm
Length	4.58mm
Width	3.86mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Key Features of BC556B

Material of the Transistor

The BC556B transistor is crafted from silicon, a reliable and efficient material widely used in electronic components. Its silicon construction ensures consistent performance and durability, even in demanding conditions, making it a dependable choice for various applications.

Polarity

As a PNP transistor, BC556B conducts when the base terminal is at a lower voltage than the emitter. This specific polarity allows it to function seamlessly in circuits designed for negative switching or amplification tasks. Its ability to manage these operations enhances its versatility.

Power Dissipation

With a maximum power dissipation rating of 0.5 watts, the BC556B is well-suited for small and medium power applications. This capability ensures that the transistor operates efficiently without the risk of overheating, provided it is used within its specified limits.

Voltage Ratings

The transistor can handle a collector-base voltage of 80V and a collector-emitter voltage of 65V. These voltage ratings allow it to perform effectively in circuits that require moderate voltage handling, such as signal processing and small load switching applications.

Current Handling

The maximum collector current of 0.1A makes this transistor suitable for low-power circuits. It provides reliable operation in applications that do not demand high current levels, such as driving LEDs or small motors.

Operating Temperature

BC556B has a wide operational temperature range, from -65°C to 150°C. This flexibility ensures that it can be used in environments with varying temperatures without compromising performance or reliability.

Frequency

The transition frequency of 150 MHz makes the BC556B capable of high-speed operations. This feature is particularly useful in applications involving fast signal switching or high-frequency amplification, such as audio systems or communication devices.

Package Type

Housed in a TO-92 package, the BC556B is compact and easy to integrate into circuit boards. Its straightforward design makes installation simpler while offering good performance in space-constrained electronic systems.

Common Applications of BC556B

Preamplifier

The BC556B is widely used in preamplifier circuits to boost weak signals to a level suitable for further amplification or processing. It ensures clean signal amplification, which is crucial in audio and communication systems.

General-Purpose Audio Amplifier

This transistor works effectively in audio amplifier circuits, providing enhanced sound quality and stable performance. Its ability to handle low to moderate power levels makes it ideal for audio systems where signal clarity is a priority.

Signal Amplification

The BC556B is a versatile component for amplifying electronic signals across a wide range of applications. Its consistent performance in amplifying weak signals ensures it can be used in projects requiring reliable signal processing.

PNP Darlington Pair

You can pair the BC556B with another transistor to form a Darlington configuration. This setup greatly increases current gain, allowing it to drive larger loads or perform high-gain amplification tasks effectively.

Driving Loads Under 100mA

This transistor can efficiently handle loads drawing less than 100mA, such as LEDs, small motors, and relays. Its ability to drive these components makes it a practical choice for low-power switching and control applications.

Driver Modules

The BC556B is commonly found in driver modules for controlling components like relays and LEDs. Its reliable switching capability ensures stable and consistent operation of these devices in various circuits.

Amplifier Modules

In both signal and audio amplifier modules, the BC556B plays an integral role in improving overall circuit performance. Its capability to handle low-power signals with precision makes it a preferred component in these modules.

Motor Control

The BC556B is also used in circuits that control small motors. Its switching capability allows precise operation, making it useful in motor control applications for robotics or automation systems.

Impedance Buffering

In circuits requiring impedance buffering, the BC556B ensures stable operation by preventing signal degradation. This capability is particularly useful in high-precision or sensitive electronic systems.

Instrumentation and Robotics Projects

The BC556B is a reliable choice for projects in instrumentation and robotics, where switching and amplification are common requirements. Its versatility and consistent performance make it a valuable component in these innovative applications.

Complementary NPN Transistor for BC556B

The BC546B is a complementary NPN transistor for the BC556B.

Equivalents of BC556B

• BC550B
• BC550BP
• BC550C
• BC550CP
• BC551
• BC556
• BC556A
• BC556AP
• TIP122
• BC556BP
• BC556VI
• BC557
• BC557A
• BC557AP
• BC557B
• BC557BP
• BC557C

Using BC556B in Circuits

BC556B is a flexible option for various electronic applications. It works effectively as a preamplifier, particularly in the early stages of audio circuits where small signals need to be boosted. You can also use it in an audio amplifier circuit to enhance sound quality or manage general signal amplification.

Beyond amplification, BC556B serves as a dependable switch for loads drawing less than 100 milliamps. This makes it practical for powering small devices like LEDs, relays, or even driving larger transistors. Its emitter-base voltage of -5V allows it to interface smoothly with microcontroller outputs, broadening its use in modern electronic systems.

Safe Operation Guidelines for BC556B

To keep BC556B functioning effectively, there are some guidelines to follow. Avoid exceeding its maximum load of 100mA at -45V DC to prevent damage. Before placing it into a circuit, double-check the pin configuration to ensure proper alignment. Always include a suitable base resistor to limit current flow and protect the transistor. Finally, keep it within the recommended temperature range, avoiding conditions below -65°C or above +150°C to maintain its performance and lifespan.

Parts with Similar Specifications to BC556B

The parts on the right have specifications similar to the ON Semiconductor BC556BTA.

Parameter	BC556BTA	BC556	BC556	2N5086BU
Manufacturer	ON Semiconductor	ON Semiconductor	ON Semiconductor	ON Semiconductor
Mount	Surface Mount, Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)
Collector Emitter Breakdown Voltage	65 V	65 V	50 V	65 V
Max Collector Current	100 mA	100 mA	100 mA	100 mA
Transition Frequency	150 MHz	150 MHz	-	150 MHz
Collector Emitter Saturation Voltage	-250 mV	-250 mV	-	-250 mV
hFE Min	110	110	150	110
Max Power Dissipation	500 mW	500 mW	625 mW	500 mW

BC556B Dimensions

Manufacturer of BC556B

onsemi, formerly known as ON Semiconductor, manufactures BC556B. They are a leading supplier of semiconductors, specializing in devices used in automotive, communications, computing, and industrial applications. Their products are known for supporting both power management and signal processing, making them reliable choices for a range of electronic projects.

Datasheet PDF

BC556B Datasheet:

BC556B.pdf

BC556B.pdf

BC556BTA Datasheet:

BC556BTA.pdf