BC548CTFR Equivalent & Substitute Parts

Part Overview

The BC548CTFR is a small-signal NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 30 V, and a transition frequency of 300 MHz. The BC548CTFR is classified as obsolete, necessitating identification of active equivalent parts for continued circuit implementation and procurement.

Key Parameters

Parameter	Value
Transistor Type	NPN
Current - Collector (Ic) (Max)	100 mA
Voltage - Collector Emitter Breakdown (Max)	30 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 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) Formed Leads

Substitute Part Grouping Explanation

Substitution of the BC548CTFR is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitutes:

Electrical Parameters (Required Match):

Transistor Type: NPN
Current - Collector (Ic) (Max): 100 mA
Voltage - Collector Emitter Breakdown (Max): 30 V
Vce Saturation (Max) @ Ib, Ic: 600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max): 15 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce: 420 @ 2 mA, 5 V
Power - Max: 500 mW
Frequency - Transition: 300 MHz
Operating Temperature (TJ): 150°C

Mechanical Parameters (Required Match):

Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA) Formed Leads

Both identified substitute parts meet all specified electrical and mechanical parameters, enabling direct functional replacement in circuit applications.

Parameter Comparison

Parameter	BC548CTFR (Main)	BC548CTA (Substitute)	BC549CTA (Substitute)
Manufacturer	onsemi	Fairchild Semiconductor	onsemi
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)	30 V	30 V	30 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 (ICBO)	15 nA (ICBO)	15 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V	420 @ 2 mA, 5 V
Power - Max	500 mW	500 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz
Operating Temperature (TJ)	150°C	150°C	150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.21.0075	8541.21.0075	8541.21.0075

Engineering Selection Recommendations

BC548CTA (Fairchild Semiconductor): This substitute part is manufactured by Fairchild Semiconductor and carries Active product status. All electrical and mechanical parameters are identical to the BC548CTFR. This part is suitable for applications requiring immediate availability and active manufacturer support.

BC549CTA (onsemi): This substitute part is manufactured by onsemi, the original manufacturer of the BC548CTFR, and carries Active product status. All electrical and mechanical parameters are identical to the BC548CTFR. This part offers the advantage of sourcing from the original equipment manufacturer. The BC549CTA is RoHS3 Compliant and carries REACH Unaffected status, providing regulatory compliance assurance.

Both substitute parts provide equivalent electrical performance and mechanical compatibility. Selection between BC548CTA and BC549CTA should be based on procurement availability, supply chain considerations, and regulatory compliance requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can BC548CTA and BC549CTA be used interchangeably with BC548CTFR?

A: Yes. Both substitute parts meet all specified electrical parameters (collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency) and mechanical parameters (through-hole mounting, TO-92-3 package). Direct substitution is electrically and mechanically valid.

Q: What is the primary reason for identifying substitutes for BC548CTFR?

A: The BC548CTFR is classified as obsolete. Active substitute parts ensure continued circuit implementation and long-term procurement viability.

Q: Are there packaging differences between the main part and substitutes?

A: No. All three parts use identical through-hole mounting with TO-92-3 (TO-226AA) formed leads packaging.

Q: Do the substitute parts have different regulatory compliance status?

A: BC549CTA is explicitly RoHS3 Compliant. All three parts carry REACH Unaffected status and share the same ECCN (EAR99) and HTSUS (8541.21.0075) classifications.

Q: What are the key electrical parameters that define substitution validity?

A: The critical parameters are: NPN transistor type, 100 mA maximum collector current, 30 V collector-emitter breakdown voltage, 600 mV saturation voltage at specified conditions, 420 minimum DC current gain, 500 mW maximum power dissipation, and 300 MHz transition frequency.

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