BC549BTF Equivalent & Substitute Parts

Part Overview

The BC549BTF 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 a transition frequency of 300 MHz. The BC549BTF is currently designated as Last Time Buy, indicating that the manufacturer has announced end-of-life status for this part number. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications 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) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	—
Power - Max	500	mW
Frequency - Transition	300	MHz
Operating Temperature (TJ)	150	°C
Package / Case	TO-92-3	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the BC549BTF is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitutes:

Electrical Parameters (Must 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: 200 @ 2 mA, 5 V
Power - Max: 500 mW
Frequency - Transition: 300 MHz
Operating Temperature (TJ): 150 °C

Mechanical Parameters (Must Match):

Package / Case: TO-92-3
Mounting Type: Through Hole

Both substitute parts listed below satisfy all electrical and mechanical requirements for direct substitution with the BC549BTF.

Parameter Comparison

Parameter	BC549BTF (onsemi)	BC548BTA (Fairchild Semiconductor)	BC549BTA (onsemi)
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	15 nA	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 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
Package / Case	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

BC548BTA (Fairchild Semiconductor): This substitute part maintains electrical and mechanical equivalence to the BC549BTF across all specified parameters. The BC548BTA is currently in Active product status, ensuring ongoing availability. This part is suitable for applications requiring immediate supply chain alternatives to the Last Time Buy BC549BTF. RoHS compliance status is not specified in the provided data.

BC549BTA (onsemi): This substitute part is manufactured by the same original equipment manufacturer as the BC549BTF and maintains full electrical and mechanical equivalence. The BC549BTA is designated as Active product status with ROHS3 compliance certification, matching the compliance profile of the original part. This option provides continuity with the original manufacturer while ensuring long-term availability.

Both substitute parts are suitable for direct replacement in applications currently utilizing the BC549BTF. Selection between substitutes should be based on supply chain availability, procurement lead times, and compliance requirements specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can the BC548BTA be used as a direct replacement for the BC549BTF?

A: Yes. The BC548BTA meets all electrical parameters (collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency) and mechanical requirements (TO-92-3 package, through-hole mounting) specified for the BC549BTF.

Q: What is the difference between BC548BTA and BC549BTA?

A: Both parts are electrically and mechanically equivalent to the BC549BTF. The primary differences are manufacturer (Fairchild Semiconductor versus onsemi) and product status. The BC549BTA is manufactured by onsemi, the original manufacturer of the BC549BTF, and carries ROHS3 compliance certification.

Q: Why is the BC549BTF designated as Last Time Buy?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part number. Existing inventory will be sold until depletion, after which the part will no longer be available. Substitution to BC548BTA or BC549BTA is recommended for new designs or long-term production requirements.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts utilize the TO-92-3 package with identical through-hole mounting configuration and pinout. Physical and electrical compatibility is maintained across all three part numbers.

Q: What compliance certifications apply to these substitute parts?

A: The BC549BTF and BC549BTA are both ROHS3 compliant. The BC548BTA compliance status is not specified in the provided technical data. Both parts carry EAR99 export classification and are REACH unaffected.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. The BC548BTA and BC549BTA are pin-compatible and electrically equivalent to the BC549BTF. No PCB modifications are required for substitution.

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