BC547BRL1 Equivalent & Substitute Parts

Part Overview

The BC547BRL1 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 BC547BRL1 is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design requirements and procurement needs. Active alternatives with identical or compatible electrical and mechanical specifications are available to maintain circuit functionality and performance.

Substiute Parts

BC547BRL1

onsemiIn Stock: 857BC547BRL1 Datasheet

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BC547BTA

Fairchild SemiconductorIn Stock: 1332BC547BTA Datasheet

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BC547CTA

onsemiIn Stock: 47080BC547CTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BC547BRL1 are qualified based on strict electrical and mechanical parameter matching within the allowed specifications for NPN small-signal bipolar junction transistors. The substitution criteria are:

Primary Matching Parameters:

• Transistor Type: NPN
• Maximum Collector Current (Ic): 100 mA
• Collector-Emitter Breakdown Voltage: 45 V
• Transition Frequency: 300 MHz
• Mounting Type: Through Hole
• Package Type: TO-92-3 (TO-226)
• Operating Temperature Range: -55°C to 150°C

Secondary Compatibility Parameters:

• DC Current Gain (hFE): Minimum 200 @ 2mA, 5V
• Collector Cutoff Current (Icbo): 15 nA maximum
• Power Dissipation: 500 mW to 625 mW

Parts meeting all primary parameters and maintaining compatibility within secondary parameter tolerances are classified as direct substitutes. Variations in Vce saturation characteristics and power ratings within the specified ranges do not preclude substitution when primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

BC547BTA (Fairchild Semiconductor): The BC547BTA is an active product offering direct electrical and mechanical compatibility with the BC547BRL1. All primary parameters match exactly: 100 mA collector current, 45 V breakdown voltage, 300 MHz transition frequency, and TO-92-3 through-hole package. The BC547BTA maintains the same DC current gain specification (200 @ 2mA, 5V) and collector cutoff current (15 nA). This substitute is suitable for applications where the main part is unavailable due to obsolescence.

BC547CTA (onsemi): The BC547CTA is an active product from the original manufacturer onsemi, providing electrical and mechanical compatibility with the BC547BRL1. Primary parameters are identical: 100 mA collector current, 45 V breakdown voltage, 300 MHz transition frequency, and TO-92-3 through-hole package. The BC547CTA features an enhanced DC current gain specification (420 @ 2mA, 5V) compared to the main part. The maximum power dissipation is rated at 500 mW versus 625 mW for the main part; this difference remains within acceptable operating margins for most small-signal applications. The BC547CTA carries ROHS3 compliance, addressing environmental and regulatory requirements not met by the obsolete BC547BRL1.

Both substitutes maintain functional equivalence for standard small-signal amplification and switching circuits. Selection between BC547BTA and BC547CTA depends on procurement availability, compliance requirements, and specific application power budget constraints.

Frequently Asked Questions (FAQ)

Q: Can BC547BTA and BC547CTA be used interchangeably with BC547BRL1?

A: Yes. Both substitutes meet all primary electrical parameters (collector current, breakdown voltage, transition frequency) and mechanical specifications (TO-92-3 package, through-hole mounting). The BC547BTA and BC547CTA are direct functional equivalents for the obsolete BC547BRL1 in small-signal amplification and switching applications.

Q: What is the difference in DC current gain between the main part and substitutes?

A: The BC547BRL1 and BC547BTA specify a minimum DC current gain (hFE) of 200 @ 2mA, 5V. The BC547CTA specifies a minimum hFE of 420 @ 2mA, 5V. The higher gain in BC547CTA may reduce base drive requirements in some circuit configurations but does not prevent substitution in standard applications.

Q: Does the 500 mW power rating of BC547CTA limit its use compared to the 625 mW BC547BRL1?

A: The BC547CTA power rating of 500 mW remains adequate for typical small-signal transistor applications. Applications requiring sustained power dissipation above 500 mW should be evaluated against specific circuit requirements. For most switching and amplification circuits, the 500 mW rating is sufficient.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use the TO-92-3 (TO-226) through-hole package with identical pin configuration and mechanical dimensions. Direct board-level substitution is possible without layout modifications.

Q: What is the significance of RoHS compliance for BC547CTA?

A: The BC547CTA carries ROHS3 compliance, indicating conformance to Restriction of Hazardous Substances regulations. The BC547BRL1 is RoHS non-compliant. For applications subject to environmental or regulatory requirements, BC547CTA is the appropriate selection.

Q: Are there temperature range differences between the parts?

A: All three parts operate across the same temperature range: -55°C to 150°C (TJ). No thermal performance differentiation exists between the main part and substitutes.

Q: What is the collector cutoff current specification, and is it identical across all parts?

A: Collector cutoff current (Icbo) is specified at 15 nA maximum for all three parts. This parameter is identical and does not differentiate the substitutes from the main part.