BC547ATAR Equivalent & Substitute Parts

Part Overview

The BC547ATAR 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 BC547ATAR is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement continuity. Active alternatives with identical or superior electrical characteristics are available from other manufacturers.

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

Substitute parts for the BC547ATAR are identified based on strict electrical and mechanical parameter matching. The substitution logic is based on the following criteria:

Primary Matching Parameters:

Transistor type (NPN)
Maximum collector current (100 mA)
Collector-emitter breakdown voltage (45 V)
Vce saturation characteristics (600 mV @ 5 mA, 100 mA)
Collector cutoff current (15 nA)
Transition frequency (300 MHz)
Package type (TO-92-3)
Mounting type (Through Hole)

Secondary Matching Parameters:

DC current gain (hFE) minimum specification
Maximum power dissipation
Operating temperature range

Substitute parts are grouped into two categories:

Similar Manufacturer Part (BC547BTA): Meets all primary electrical parameters with enhanced power rating (625 mW vs. 500 mW) and higher DC current gain (200 vs. 110). Product status is Active.
Parametric Equivalent (BC547ATA): Provides identical electrical specifications across all measured parameters, including DC current gain (110 @ 2 mA, 5 V) and power rating (500 mW). Product status is Active.

Parameter Comparison

Parameter	BC547ATAR (Main)	BC547BTA (Similar)	BC547ATA (Equivalent)
Manufacturer	onsemi	Fairchild Semiconductor	Fairchild Semiconductor
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) Max	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA
DC Current Gain (hFE) Min @ Ic, Vce	110 @ 2 mA, 5 V	200 @ 2 mA, 5 V	110 @ 2 mA, 5 V
Power - Max	500 mW	625 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz
Operating Temperature (Max)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.21.0075	8541.21.0075	8541.21.0075

Engineering Selection Recommendations

BC547ATA (Parametric Equivalent): This part is the primary substitute for the BC547ATAR. It provides identical electrical specifications, including DC current gain (110 @ 2 mA, 5 V) and power dissipation (500 mW). The BC547ATA is manufactured by Fairchild Semiconductor with Active product status, ensuring long-term availability and supply chain stability. Both parts share identical compliance classifications (ECCN: EAR99, HTSUS: 8541.21.0075) and package specifications (TO-92-3). This part is suitable for direct replacement in all applications where the BC547ATAR was originally specified.

BC547BTA (Similar Manufacturer Part): This part is an alternative substitute offering enhanced electrical performance. The BC547BTA provides a higher DC current gain (200 @ 2 mA, 5 V) and increased maximum power dissipation (625 mW vs. 500 mW). The BC547BTA is also manufactured by Fairchild Semiconductor with Active product status. This part is suitable for applications where the higher current gain and power rating provide design margin or performance improvement. The BC547BTA maintains identical voltage and current specifications, package type, and compliance classifications.

Both substitute parts are available in Active product status, ensuring procurement reliability and technical support continuity compared to the obsolete BC547ATAR.

Frequently Asked Questions (FAQ)

Q: Can the BC547ATA be used as a direct replacement for the BC547ATAR?

A: Yes. The BC547ATA is a parametric equivalent with identical electrical specifications across all measured parameters, including maximum collector current (100 mA), collector-emitter breakdown voltage (45 V), DC current gain (110 @ 2 mA, 5 V), power dissipation (500 mW), and transition frequency (300 MHz). Both parts use the TO-92-3 package with through-hole mounting. The BC547ATA is suitable for direct substitution in all applications.

Q: What is the difference between the BC547BTA and BC547ATA?

A: The BC547BTA and BC547ATA differ in two electrical parameters. The BC547BTA has a higher DC current gain (200 @ 2 mA, 5 V) compared to the BC547ATA (110 @ 2 mA, 5 V). The BC547BTA also has a higher maximum power dissipation (625 mW) compared to the BC547ATA (500 mW). All other electrical parameters, including maximum collector current, breakdown voltage, saturation characteristics, and transition frequency, are identical. Both parts use the TO-92-3 package.

Q: Are the substitute parts available in the same package as the BC547ATAR?

A: Yes. Both the BC547ATA and BC547BTA are available in the TO-92-3 package with through-hole mounting, identical to the BC547ATAR. This ensures mechanical and electrical compatibility in existing PCB designs without layout modifications.

Q: What is the product status of the substitute parts?

A: Both the BC547ATA and BC547BTA have Active product status, indicating current manufacturing and availability. This contrasts with the BC547ATAR, which is classified as Obsolete. Active status ensures long-term supply chain reliability and technical support.

Q: Are there any compliance or regulatory differences between the main part and substitutes?

A: No. The BC547ATAR, BC547ATA, and BC547BTA all share identical compliance classifications: ECCN EAR99 and HTSUS 8541.21.0075. All three parts are REACH Unaffected. There are no regulatory or compliance barriers to substitution.

Q: Which substitute should be selected for new designs?

A: For new designs, either the BC547ATA or BC547BTA is appropriate. The BC547ATA provides identical electrical performance to the BC547ATAR. The BC547BTA offers enhanced performance with higher current gain and power rating, providing additional design margin. Selection depends on specific application requirements and design specifications.

Q: Can the BC547BTA be used in applications originally designed for the BC547ATAR?

A: Yes. The BC547BTA meets or exceeds all electrical specifications of the BC547ATAR. The higher DC current gain (200 vs. 110) and increased power dissipation (625 mW vs. 500 mW) provide enhanced performance. The BC547BTA is suitable for all applications where the BC547ATAR was originally specified.

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