BC550CBU Equivalent & Substitute Parts

Part Overview

The BC550CBU is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This transistor features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and a maximum power dissipation of 500 mW in a Through Hole TO-92-3 package. The BC550CBU holds Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring NPN transistor functionality within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Power - Max	500	mW
Frequency - Transition	300	MHz
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	—
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature (TJ)	150	°C

Substitute Part Grouping Explanation

Substitute parts for the BC550CBU are classified based on electrical and mechanical parameter compatibility. Substitution is valid when the following criteria are met:

Parametric Equivalents share identical or superior electrical specifications across all critical parameters: NPN transistor type, 100 mA maximum collector current, 45 V collector-emitter breakdown voltage, 500 mW maximum power dissipation, 300 MHz transition frequency, 420 minimum DC current gain at specified conditions, and Through Hole TO-92-3 package configuration.

Similar Parts maintain compatibility in transistor type, collector current, and package form factor but may exhibit variations in voltage rating, power dissipation, transition frequency, or DC current gain. These parts are suitable for applications where the specified parameter differences do not impact circuit performance.

The following key parameters determine substitution validity:

Transistor Type (NPN)
Current - Collector (Ic) Max (100 mA minimum)
Voltage - Collector Emitter Breakdown (45 V minimum)
Mounting Type (Through Hole)
Package / Case (TO-92-3)

Parameter Comparison

Parameter	BC550CBU (onsemi)	BC547CBU (Fairchild Semiconductor)	2N5232A PBFREE (Central Semiconductor Corp)
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) Max	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	50 V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA	125mV @ 1mA, 10mA
Current - Collector Cutoff (Max)	15nA (ICBO)	15nA (ICBO)	30nA
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	420 @ 2mA, 5V	250 @ 2mA, 5V
Power - Max	500 mW	500 mW	625 mW
Frequency - Transition	300 MHz	300 MHz	Not specified
Operating Temperature (TJ)	150°C	150°C	−65°C to 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

BC547CBU (Fairchild Semiconductor) is a parametric equivalent to the BC550CBU. This part maintains identical electrical specifications across all critical parameters: 100 mA maximum collector current, 45 V collector-emitter breakdown voltage, 500 mW maximum power dissipation, 300 MHz transition frequency, and 420 minimum DC current gain. Both parts are Active status products in Through Hole TO-92-3 packaging. The BC547CBU is suitable for direct substitution in applications where the BC550CBU is specified.

2N5232A PBFREE (Central Semiconductor Corp) is classified as a similar part with extended parameter ranges. This transistor provides a higher collector-emitter breakdown voltage of 50 V and increased maximum power dissipation of 625 mW, offering enhanced voltage and thermal margins. The 2N5232A PBFREE features a lower DC current gain minimum of 250 at specified conditions and reduced saturation voltage of 125 mV, which may impact circuit biasing and switching characteristics. This part is suitable for applications where the higher voltage rating and power capability provide design advantages, provided circuit design accommodates the different gain and saturation characteristics. The 2N5232A PBFREE is RoHS3 compliant and Active status.

All three parts are Through Hole TO-92-3 package devices suitable for identical mechanical mounting configurations. Selection between BC550CBU and BC547CBU is based on availability and supply chain requirements, as they are parametric equivalents. Selection of 2N5232A PBFREE requires verification that circuit design parameters accommodate the specified electrical differences.

Frequently Asked Questions (FAQ)

Q: Can BC547CBU replace BC550CBU in all applications?

A: Yes. The BC547CBU is a parametric equivalent with identical electrical specifications. Both transistors feature 100 mA maximum collector current, 45 V collector-emitter breakdown voltage, 500 mW maximum power dissipation, 300 MHz transition frequency, and 420 minimum DC current gain. Both are Active status products in TO-92-3 packaging. Direct substitution is valid without circuit modification.

Q: What are the key differences between BC550CBU and 2N5232A PBFREE?

A: The 2N5232A PBFREE differs in the following parameters: collector-emitter breakdown voltage is 50 V (versus 45 V), maximum power dissipation is 625 mW (versus 500 mW), DC current gain minimum is 250 (versus 420), and saturation voltage is 125 mV (versus 600 mV). Transition frequency is not specified for the 2N5232A PBFREE. These differences affect circuit biasing, switching speed, and thermal performance.

Q: Are all substitute parts available in the same package?

A: Yes. BC550CBU, BC547CBU, and 2N5232A PBFREE are all available in Through Hole TO-92-3 package configuration. Mechanical mounting and pin compatibility are identical across all three parts.

Q: Which substitute part offers the best thermal performance?

A: The 2N5232A PBFREE provides the highest maximum power dissipation rating at 625 mW, compared to 500 mW for both BC550CBU and BC547CBU. This higher rating provides additional thermal margin in power-dissipation-limited applications.

Q: Are all substitute parts RoHS3 compliant?

A: BC550CBU and 2N5232A PBFREE are explicitly RoHS3 compliant. RoHS status for BC547CBU is not specified in the provided data.

Q: What is the impact of different DC current gain values on circuit design?

A: DC current gain (hFE) determines the base current required to achieve specified collector current levels. BC550CBU and BC547CBU both feature 420 minimum hFE at 2 mA collector current and 5 V collector-emitter voltage. The 2N5232A PBFREE features 250 minimum hFE at the same conditions, requiring approximately 1.68 times higher base current for equivalent collector current. Circuit biasing resistor values must be adjusted accordingly when substituting with 2N5232A PBFREE.

Q: Can 2N5232A PBFREE be used in high-frequency applications?

A: Transition frequency is not specified for 2N5232A PBFREE. BC550CBU and BC547CBU both specify 300 MHz transition frequency. Applications requiring defined high-frequency performance should use BC550CBU or BC547CBU to ensure specified frequency response.

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