BC547B Equivalent & Substitute Parts

Part Overview

The BC547B is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This through-hole component operates at a maximum collector voltage of 45 V with a collector current rating of 100 mA and dissipates up to 500 mW. The BC547B maintains active product status with 19,651 units in current inventory. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring NPN transistor functionality within the specified electrical and mechanical parameters.

Substiute Parts

BC547B

onsemiIn Stock: 19701BC547B Datasheet

Current PartRFQ

BC547CBU

Fairchild SemiconductorIn Stock: 10812BC547CBU Datasheet

SimilarRFQ

BC547BBU

onsemiIn Stock: 21969BC547BBU Datasheet

Parametric EquivalentRFQ

2N5232A PBFREE

Central Semiconductor CorpIn Stock: 178042N5232A PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BC547B are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Electrical Parameters (Must Match or Exceed):

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 45 V minimum
• Current - Collector (Ic) (Max): 100 mA minimum
• Power - Max: 500 mW minimum
• Frequency - Transition: 300 MHz minimum
• Operating Temperature: 150°C maximum junction temperature minimum
• Package / Case: TO-92-3 through-hole configuration

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package / Case: TO-92-3 (TO-226AA)

Parts are grouped into two categories:

Parametric Equivalent: BC547BBU matches all electrical specifications identically to the BC547B, including DC current gain (hFE) of 200 @ 2 mA, 5 V, and saturation voltage of 600 mV @ 5 mA, 100 mA. This part is manufactured by onsemi and maintains identical performance characteristics.

Similar Manufacturer Part: BC547CBU is manufactured by Fairchild Semiconductor and meets all electrical requirements with identical voltage, current, and power ratings. The DC current gain (hFE) is specified at 420 @ 2 mA, 5 V, which exceeds the BC547B minimum of 200, providing enhanced amplification capability while maintaining full compatibility.

Similar Manufacturer Part: 2N5232A PBFREE is manufactured by Central Semiconductor Corp and exceeds the BC547B specifications in voltage rating (50 V vs. 45 V) and power dissipation (625 mW vs. 500 mW). This part provides additional design margin for applications requiring higher voltage or power handling. The DC current gain (hFE) is specified at 250 @ 2 mA, 5 V. Transition frequency is not specified for this part.

Parameter Comparison

Engineering Selection Recommendations

BC547BBU (onsemi) is the direct parametric equivalent to the BC547B. Both parts are manufactured by onsemi, maintain identical electrical specifications, and carry ROHS3 compliance certification. This part is suitable for direct replacement in all applications where BC547B is specified. Inventory availability is 21,955 units.

BC547CBU (Fairchild Semiconductor) meets all electrical requirements of the BC547B with identical voltage, current, and power ratings. The higher DC current gain (hFE of 420 vs. 200) provides increased amplification capability. This part is suitable for applications where the BC547B is specified, with the understanding that the higher current gain may require circuit design adjustment in gain-sensitive applications. Inventory availability is 10,748 units.

2N5232A PBFREE (Central Semiconductor Corp) exceeds the BC547B specifications in voltage rating (50 V vs. 45 V) and power dissipation (625 mW vs. 500 mW). This part is suitable for applications requiring additional design margin or operating in higher voltage environments. The lower saturation voltage (125 mV vs. 600 mV) indicates improved switching performance. ROHS3 compliance is maintained. Inventory availability is 17,706 units. Transition frequency is not specified for this part and should be evaluated for frequency-dependent applications.

All substitute parts maintain active product status, through-hole TO-92-3 packaging, and 150°C maximum operating temperature. Selection should be based on specific application requirements, inventory availability, and design margin considerations.

Frequently Asked Questions (FAQ)

Q: Can BC547BBU be used as a direct replacement for BC547B?

A: Yes. BC547BBU is a parametric equivalent manufactured by onsemi with identical electrical specifications, including voltage rating (45 V), current rating (100 mA), power dissipation (500 mW), DC current gain (200 @ 2 mA, 5 V), and saturation voltage (600 mV @ 5 mA, 100 mA). Both parts use TO-92-3 through-hole packaging and maintain ROHS3 compliance.

Q: What is the difference between BC547CBU and BC547B?

A: BC547CBU is manufactured by Fairchild Semiconductor and meets all electrical requirements of the BC547B. The primary difference is the DC current gain specification: BC547CBU is rated at 420 @ 2 mA, 5 V, compared to BC547B at 200 @ 2 mA, 5 V. This higher gain may require circuit design adjustment in applications where gain is a critical parameter. All other electrical and mechanical specifications are identical.

Q: Is 2N5232A PBFREE suitable for BC547B applications?

A: 2N5232A PBFREE meets the core electrical requirements of the BC547B with identical collector current (100 mA) and operating temperature (150°C). However, this part exceeds the BC547B in voltage rating (50 V vs. 45 V) and power dissipation (625 mW vs. 500 mW). The saturation voltage is significantly lower (125 mV vs. 600 mV), indicating improved switching performance. Transition frequency is not specified for 2N5232A PBFREE and should be evaluated for frequency-dependent applications. This part is suitable for applications where additional design margin is beneficial.

Q: Are all substitute parts available in the same package as BC547B?

A: Yes. All substitute parts (BC547BBU, BC547CBU, and 2N5232A PBFREE) are packaged in TO-92-3 (TO-226AA) through-hole configuration, identical to the BC547B. Direct mechanical substitution is supported without PCB layout modification.

Q: Do all substitute parts meet RoHS compliance requirements?

A: BC547BBU and 2N5232A PBFREE are ROHS3 compliant. RoHS status is not specified for BC547CBU in the provided data. Compliance verification should be confirmed with the supplier for BC547CBU if RoHS certification is a design requirement.

Q: What is the inventory status of each substitute part?

A: BC547B: 19,651 units in stock. BC547BBU: 21,955 units in stock. BC547CBU: 10,748 units in stock. 2N5232A PBFREE: 17,706 units in stock. All parts are available as new original stock.

Q: Can BC547B be used in high-frequency applications?

A: BC547B is rated for 300 MHz transition frequency, supporting high-frequency switching and amplification applications up to this specification. BC547BBU and BC547CBU maintain identical 300 MHz transition frequency. 2N5232A PBFREE does not specify transition frequency and should not be assumed suitable for frequency-dependent applications without additional verification.