BC549BTFR Equivalent & Substitute Parts

Part Overview

The BC549BTFR 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 30 V with a collector current rating of 100 mA and delivers 500 mW of power dissipation. The BC549BTFR is packaged in a TO-92-3 through-hole configuration suitable for conventional PCB assembly.

The BC549BTFR carries an Obsolete product status, indicating that onsemi has discontinued this part number. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	200 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	300	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the BC549BTFR is determined by electrical and mechanical parameter equivalence across the following critical specifications:

Electrical Parameters:

Transistor polarity: NPN type
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 30 V
Saturation voltage: 600 mV @ 5 mA, 100 mA
Collector cutoff current: 15 nA maximum
DC current gain (hFE): 200 minimum @ 2 mA, 5 V
Maximum power dissipation: 500 mW
Transition frequency: 300 MHz

Mechanical Parameters:

Mounting configuration: Through Hole
Package type: TO-92-3 (TO-226AA) with formed leads

All substitute parts listed maintain identical electrical ratings and mechanical compatibility with the BC549BTFR. Substitutes are grouped by product status and availability to support design continuity and procurement flexibility.

Parameter Comparison

Parameter	BC549BTFR (Main)	BC549BTF	BC549BTA	BC548BTA
Manufacturer	onsemi	onsemi	onsemi	Fairchild Semiconductor
Product Status	Obsolete	Last Time Buy	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Ic (Max)	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	30 V	30 V	30 V	30 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)	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V
Power (Max)	500 mW	500 mW	500 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz	300 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	150°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	REACH Unaffected	ROHS3 Compliant	ROHS3 Compliant	Not Specified

Engineering Selection Recommendations

BC549BTF (onsemi): This part carries a Last Time Buy status from onsemi, indicating limited availability as the manufacturer transitions away from this product line. The BC549BTF maintains full electrical and mechanical equivalence to the BC549BTFR and carries ROHS3 compliance certification. Selection of this part is appropriate for applications requiring onsemi-sourced components with confirmed regulatory compliance, provided procurement occurs within the Last Time Buy window.

BC549BTA (onsemi): This part holds Active product status from onsemi, ensuring ongoing availability and supply chain stability. The BC549BTA is supplied in Cut Tape packaging and carries ROHS3 compliance certification. This part number is the primary recommendation for new designs and ongoing production requiring onsemi-manufactured NPN transistors with the BC549 electrical specification.

BC548BTA (Fairchild Semiconductor): This part is manufactured by Fairchild Semiconductor and maintains Active product status with full electrical and mechanical equivalence to the BC549BTFR. The BC548BTA provides an alternative sourcing option from a different manufacturer, supporting supply chain diversification and procurement flexibility. This part is suitable for applications where multi-source qualification is required or where Fairchild Semiconductor components are preferred.

Frequently Asked Questions (FAQ)

Q: Can BC549BTF, BC549BTA, and BC548BTA be used interchangeably with BC549BTFR?

A: Yes. All three substitute parts maintain identical electrical ratings across collector current, collector-emitter breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency. All parts are packaged in TO-92-3 through-hole configuration with formed leads, ensuring mechanical compatibility and direct pin-for-pin substitution.

Q: What is the difference between BC549BTF and BC549BTA?

A: Both parts are manufactured by onsemi and share identical electrical specifications. The primary difference is product status: BC549BTF carries Last Time Buy status with limited availability, while BC549BTA holds Active status with ongoing production and supply. BC549BTA is the recommended choice for new designs and sustained production requirements.

Q: Why would I select BC548BTA over onsemi alternatives?

A: BC548BTA is manufactured by Fairchild Semiconductor and provides an alternative sourcing option. Selection of this part is appropriate when supply chain diversification is required, when Fairchild Semiconductor components are preferred within a design ecosystem, or when procurement from multiple manufacturers is mandated by supply chain strategy.

Q: Are there packaging differences between these substitute parts?

A: All substitute parts are supplied in TO-92-3 through-hole packages with formed leads. Packaging format differences exist at the supplier level (Bulk, Cut Tape), but these do not affect electrical performance or mechanical compatibility. Packaging format selection depends on procurement volume and assembly process requirements.

Q: What compliance certifications apply to these substitute parts?

A: BC549BTF and BC549BTA carry ROHS3 compliance certification. All parts maintain REACH Unaffected status. Compliance documentation should be verified with the specific supplier and manufacturing date code for applications requiring formal regulatory certification.

Q: Is the BC549BTFR still available for purchase?

A: The BC549BTFR carries Obsolete product status from onsemi, indicating discontinued manufacturing. Availability is limited to existing inventory held by component distributors. For new procurement, BC549BTA (Active status) or BC549BTF (Last Time Buy status) are the recommended alternatives from onsemi.

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