BC547ABU Equivalent & Substitute Parts

Part Overview

The BC547ABU is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and a transition frequency of 300 MHz. The BC547ABU is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	300	MHz
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution eligibility for the BC547ABU is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be NPN
Maximum collector current (Ic) must be ≥ 100 mA
Collector-emitter breakdown voltage (VCEO) must be ≥ 45 V
Vce saturation must not exceed 600 mV @ 5 mA, 100 mA
Collector cutoff current (ICBO) must not exceed 15 nA
DC current gain (hFE) minimum must be ≥ 110 @ 2 mA, 5 V
Maximum power dissipation must be ≥ 500 mW
Transition frequency must be ≥ 300 MHz

Mechanical Compatibility Criteria:

Mounting type must be Through Hole
Package must be TO-92-3 (TO-226-3)

The BC547BTA meets all specified electrical and mechanical parameters and qualifies as a direct substitute for the BC547ABU.

Parameter Comparison

Parameter	BC547ABU (onsemi)	BC547BTA (Fairchild Semiconductor)	Match Status
Transistor Type	NPN	NPN	✓ Equivalent
Current - Collector (Ic) (Max)	100 mA	100 mA	✓ Equivalent
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓ Equivalent
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	✓ Equivalent
Current - Collector Cutoff (Max)	15 nA	15 nA	✓ Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	200 @ 2 mA, 5 V	✓ Exceeds Minimum
Power - Max	500 mW	625 mW	✓ Exceeds Minimum
Frequency - Transition	300 MHz	300 MHz	✓ Equivalent
Mounting Type	Through Hole	Through Hole	✓ Equivalent
Package / Case	TO-92-3	TO-92-3	✓ Equivalent
Operating Temperature (Max)	150 °C	150 °C	✓ Equivalent
Product Status	Obsolete	Active	✓ Active Alternative

Engineering Selection Recommendations

The BC547BTA manufactured by Fairchild Semiconductor is a direct electrical and mechanical substitute for the BC547ABU. The BC547BTA maintains all critical electrical parameters at or above the BC547ABU specifications, including collector current, breakdown voltage, saturation voltage, and transition frequency. The BC547BTA additionally provides enhanced DC current gain (200 vs. 110 minimum) and increased power dissipation capability (625 mW vs. 500 mW), offering improved performance margins in circuit applications.

The BC547ABU is classified as obsolete, whereas the BC547BTA maintains active product status, ensuring long-term availability and supply chain continuity. Both devices are assigned identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming regulatory equivalence. The BC547BTA is suitable for direct replacement in applications currently utilizing the BC547ABU without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the BC547BTA be used as a direct replacement for the BC547ABU in existing designs?

A: Yes. The BC547BTA meets or exceeds all electrical specifications of the BC547ABU, including maximum collector current, breakdown voltage, saturation voltage, and transition frequency. Both devices use identical TO-92-3 through-hole packaging, enabling direct pin-compatible substitution without circuit redesign.

Q: What are the key differences between the BC547ABU and BC547BTA?

A: The primary differences are manufacturer (onsemi vs. Fairchild Semiconductor) and product status (obsolete vs. active). The BC547BTA provides higher DC current gain (200 minimum vs. 110 minimum) and greater power dissipation capability (625 mW vs. 500 mW). These enhancements represent performance improvements rather than deviations from the BC547ABU specification.

Q: Are there any package or pinout differences between these devices?

A: No. Both the BC547ABU and BC547BTA use the TO-92-3 (TO-226-3) through-hole package with identical pinout configuration. Physical dimensions and lead spacing are equivalent, permitting direct board-level substitution.

Q: Why is the BC547ABU classified as obsolete?

A: The BC547ABU is listed as obsolete by onsemi. The BC547BTA, maintained in active production by Fairchild Semiconductor, provides equivalent functionality and serves as the recommended alternative for new designs and ongoing procurement.

Q: What electrical parameters determine substitution eligibility?

A: Substitution eligibility is determined by equivalence or superiority across collector current rating, collector-emitter breakdown voltage, saturation voltage, collector cutoff current, DC current gain, power dissipation, and transition frequency. The BC547BTA satisfies all these criteria relative to the BC547ABU.

Q: Are regulatory certifications identical between these parts?

A: Yes. Both the BC547ABU and BC547BTA share identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications, confirming regulatory and compliance equivalence.

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