BC549CTFR Equivalent & Substitute Parts

Part Overview

The BC549CTFR is an NPN bipolar junction transistor (BJT) 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 a transition frequency of 300 MHz. The BC549CTFR is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility across all critical performance parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Maximum Collector Current (Ic)	100	mA
Maximum Collector-Emitter Breakdown Voltage	30	V
Vce Saturation (Max)	600 mV @ 5 mA, 100 mA	—
Maximum Collector Cutoff Current (ICBO)	15	nA
DC Current Gain (hFE Min)	420 @ 2 mA, 5 V	—
Maximum Power Dissipation	500	mW
Transition Frequency	300	MHz
Maximum Operating Temperature	150	°C
Mounting Type	Through Hole	—
Package Type	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitute parts for the BC549CTFR are selected based on strict equivalence across all electrical and mechanical parameters. The substitution logic is based on the following criteria:

Electrical Parameter Matching:

Transistor type must be NPN
Maximum collector current: 100 mA
Maximum collector-emitter breakdown voltage: 30 V
Vce saturation: 600 mV @ 5 mA, 100 mA
Maximum collector cutoff current: 15 nA (ICBO)
DC current gain (hFE): minimum 420 @ 2 mA, 5 V
Maximum power dissipation: 500 mW
Transition frequency: 300 MHz
Maximum operating temperature: 150 °C

Mechanical Parameter Matching:

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

All substitute parts listed maintain complete electrical and mechanical compatibility with the BC549CTFR across these parameters.

Parameter Comparison

Parameter	BC549CTFR (Main)	BC548CTA (Substitute)	BC549CTA (Substitute)
Manufacturer	onsemi	Fairchild Semiconductor	onsemi
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Maximum Collector Current (Ic)	100 mA	100 mA	100 mA
Maximum Collector-Emitter Breakdown Voltage	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
Maximum Collector Cutoff Current (ICBO)	15 nA	15 nA	15 nA
DC Current Gain (hFE Min)	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V
Maximum Power Dissipation	500 mW	500 mW	500 mW
Transition Frequency	300 MHz	300 MHz	300 MHz
Maximum Operating Temperature	150 °C	150 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package Type	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
ECCN Classification	EAR99	EAR99	EAR99
HTSUS Code	8541.21.0075	8541.21.0075	8541.21.0075
REACH Status	REACH Unaffected	Not specified	REACH Unaffected

Engineering Selection Recommendations

BC549CTA (onsemi) is the primary substitute for the BC549CTFR. This part is manufactured by the same original equipment manufacturer (onsemi) and maintains identical electrical and mechanical specifications. The BC549CTA carries an active product status, ensuring long-term availability and supply chain continuity. The part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The packaging format is Cut Tape (CT), suitable for automated assembly processes.

BC548CTA (Fairchild Semiconductor) is an alternative substitute manufactured by Fairchild Semiconductor. This part meets all electrical and mechanical parameter requirements and maintains active product status. The BC548CTA is supplied in bulk packaging format. Both substitute parts are electrically and mechanically interchangeable with the BC549CTFR within the specified application parameters.

The selection between BC549CTA and BC548CTA depends on supply chain requirements, packaging preferences, and procurement specifications. Both parts satisfy the technical requirements for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the BC548CTA and BC549CTA be used interchangeably with the BC549CTFR?

A: Yes. Both substitute parts maintain identical electrical parameters across collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency. Both use the same TO-92-3 package with formed leads and through-hole mounting. Electrical and mechanical compatibility is complete.

Q: What is the primary reason for substituting the BC549CTFR?

A: The BC549CTFR is classified as obsolete. The BC549CTA and BC548CTA are active products with confirmed long-term availability, making them suitable for new designs and ongoing production.

Q: Are there packaging differences between the substitute parts?

A: The BC549CTA is supplied in Cut Tape (CT) format, while the BC548CTA is supplied in bulk packaging. Both use the TO-92-3 package type. Packaging selection depends on assembly process requirements and order quantities.

Q: Do the substitute parts meet current regulatory compliance standards?

A: The BC549CTA is ROHS3 compliant and REACH unaffected. Both substitute parts carry EAR99 export classification and 8541.21.0075 HTSUS code, matching the original part's regulatory status.

Q: What are the critical electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching transistor type (NPN), maximum collector current (100 mA), collector-emitter breakdown voltage (30 V), saturation voltage (600 mV @ 5 mA, 100 mA), collector cutoff current (15 nA), DC current gain (420 @ 2 mA, 5 V), power dissipation (500 mW), and transition frequency (300 MHz). All substitute parts match these specifications exactly.

Q: Can the BC549CTFR be used in new production designs?

A: No. The BC549CTFR is obsolete. New designs must use BC549CTA or BC548CTA, both of which are active products with confirmed availability.

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