BC547BTFR Equivalent & Substitute Parts Reference

Part Overview

The BC547BTFR is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device operates at a maximum collector voltage of 45 V with a collector current rating of 100 mA and a transition frequency of 300 MHz. The BC547BTFR is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Maximum Collector Current (Ic)	100	mA
Maximum Collector-Emitter Breakdown Voltage	45	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Maximum Collector Cutoff Current (ICBO)	15	nA
DC Current Gain (hFE Min) @ Ic, Vce	200 @ 2 mA, 5 V	—
Maximum Power Dissipation	500	mW
Transition Frequency (fT)	300	MHz
Maximum Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC547BTFR is determined by strict equivalence across the following critical parameters: transistor type (NPN), maximum collector current (100 mA), maximum collector-emitter breakdown voltage (45 V), Vce saturation characteristics (600 mV @ 5 mA, 100 mA), DC current gain (200 @ 2 mA, 5 V), transition frequency (300 MHz), and package configuration (TO-92-3). All identified substitutes maintain these electrical specifications within the defined tolerances.

The substitute parts are categorized as follows:

Direct Manufacturer Equivalent: BC547BTA (Fairchild Semiconductor) — identical electrical parameters with enhanced power rating (625 mW) and active product status.

Parametric Equivalent: BC547BTF (onsemi) — same manufacturer as the main part, identical electrical specifications, active product status, and RoHS3 compliance.

Similar Equivalent: BC547B (Diotec Semiconductor) — matches all critical electrical parameters with active product status and extended operating temperature range.

Parameter Comparison

Parameter	BC547BTFR (Main)	BC547BTA	BC547BTF	BC547B
Manufacturer	onsemi	Fairchild Semiconductor	onsemi	Diotec Semiconductor
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Ic (Max)	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	45 V	45 V	45 V	45 V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
ICBO (Max)	15 nA	15 nA	15 nA	15 nA
hFE (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Power (Max)	500 mW	625 mW	500 mW	500 mW
fT	300 MHz	300 MHz	300 MHz	300 MHz
Operating Temperature (TJ)	150°C	−55°C ~ 150°C	150°C	−55°C ~ 150°C
Package	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole

Engineering Selection Recommendations

BC547BTF (onsemi) is the primary recommended substitute. This part is manufactured by the same supplier as the main component, maintains identical electrical specifications, carries active product status, and holds RoHS3 compliance certification. It provides direct continuity for existing designs with no parameter deviations.

BC547BTA (Fairchild Semiconductor) serves as a secondary alternative. It delivers all required electrical parameters with an increased power dissipation rating of 625 mW and an extended operating temperature range (−55°C to 150°C). This part is suitable for applications requiring enhanced thermal margin or wider temperature operation.

BC547B (Diotec Semiconductor) functions as a tertiary option. It matches all critical electrical specifications and offers active product status with an extended operating temperature range (−55°C to 150°C). This part is available in high inventory quantities.

All three substitutes are electrically and mechanically compatible with the BC547BTFR in TO-92-3 package configurations. Selection should prioritize BC547BTF for direct replacement, with BC547BTA or BC547B selected based on specific thermal or temperature range requirements.

Frequently Asked Questions (FAQ)

Q: Can BC547BTF directly replace BC547BTFR without circuit modification?

A: Yes. BC547BTF maintains identical electrical parameters across all critical specifications: collector current (100 mA), breakdown voltage (45 V), saturation voltage (600 mV @ 5 mA, 100 mA), current gain (200 @ 2 mA, 5 V), transition frequency (300 MHz), and package configuration (TO-92-3). No circuit changes are required.

Q: What is the primary difference between BC547BTA and BC547BTF?

A: BC547BTA is manufactured by Fairchild Semiconductor and provides a higher power rating (625 mW versus 500 mW) with an extended operating temperature range (−55°C to 150°C). All other electrical parameters are identical. BC547BTA is selected when additional thermal headroom or lower temperature operation is required.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. BC547BTF and BC547BTA are supplied in TO-92-3 packages. BC547B is available in both TO-92-3 and TO-92 package variants. Verify the specific package designation during procurement to ensure mechanical compatibility with existing PCB layouts.

Q: Does BC547B have any compliance or certification differences?

A: BC547B from Diotec Semiconductor does not specify RoHS status or moisture sensitivity level in the provided data. BC547BTF carries RoHS3 compliance. For applications requiring specific compliance certifications, BC547BTF is the preferred choice.

Q: Why is BC547BTFR classified as obsolete?

A: The BC547BTFR is marked as obsolete by onsemi. Active alternatives with identical or superior specifications are available from multiple manufacturers, including BC547BTF from the same supplier, ensuring design continuity and long-term component availability.

Q: Can these substitutes be used interchangeably in high-frequency applications?

A: Yes. All substitute parts maintain the 300 MHz transition frequency specification, making them suitable for applications operating within this frequency range. No performance degradation occurs in high-frequency switching or amplification circuits.

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