BC548BTFR Equivalent & Substitute Parts

Part Overview

The BC548BTFR 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 BC548BTFR is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while offering active product status and continued availability.

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
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the BC548BTFR is determined by strict equivalence across all critical electrical parameters and mechanical compatibility. The following parameters establish substitution validity:

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
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):

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

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the BC548BTFR in circuit applications.

Parameter Comparison

Parameter	BC548BTFR (onsemi)	BC548BTA (Fairchild)	BC549BTA (onsemi)	BC549BTF (onsemi)
Transistor Type	NPN	NPN	NPN	NPN
Current - Collector (Ic) (Max)	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	30 V	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	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	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	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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Last Time Buy
RoHS Status	Not Specified	Not Specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	Not Specified	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BC548BTA (Fairchild Semiconductor): This part is a direct manufacturer equivalent with active product status. All electrical and mechanical parameters are identical to the BC548BTFR. The BC548BTA is supplied in bulk packaging and offers immediate availability for production applications requiring the BC548 base product number.

BC549BTA (onsemi): This part is a parametric equivalent manufactured by onsemi with active product status. All electrical specifications and mechanical characteristics match the BC548BTFR. The BC549BTA carries ROHS3 compliance certification and is supplied in cut tape packaging. This option is suitable for applications requiring RoHS compliance documentation.

BC549BTF (onsemi): This part is a parametric equivalent manufactured by onsemi with last time buy product status. All electrical specifications and mechanical characteristics match the BC548BTFR. The BC549BTF carries ROHS3 compliance certification and is supplied in cut tape packaging. This option provides the highest current inventory availability but has a defined end-of-life status.

For new designs, BC548BTA or BC549BTA are preferred due to active product status. For existing production lines, BC549BTF offers substantial inventory availability during its last time buy period.

Frequently Asked Questions (FAQ)

Q: Can BC548BTA, BC549BTA, and BC549BTF be used interchangeably with BC548BTFR?

A: Yes. All three substitute parts meet identical electrical specifications across collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency. All are packaged in TO-92-3 through-hole configuration. Direct pin-for-pin substitution is valid in circuit applications.

Q: What is the difference between BC548 and BC549 base product numbers?

A: The BC548 and BC549 are distinct base product families. However, the specific variants provided (BC548BTA, BC549BTA, BC549BTF) all share identical electrical parameters and are therefore functionally equivalent for this application.

Q: Why is BC548BTFR classified as obsolete?

A: The BC548BTFR has reached end-of-life status with onsemi. Active equivalent parts are available from both onsemi (BC549BTA, BC549BTF) and Fairchild Semiconductor (BC548BTA) to support ongoing production and design requirements.

Q: Does packaging format affect substitution?

A: The electrical and mechanical specifications are identical across all substitute parts. Packaging format differences (bulk, cut tape) relate to supply chain and inventory management only and do not affect circuit performance or pin compatibility.

Q: Are there compliance differences between substitute options?

A: BC549BTA and BC549BTF carry ROHS3 compliance certification. BC548BTA compliance status is not specified in available documentation. For applications requiring documented RoHS compliance, BC549BTA or BC549BTF are appropriate selections.

Q: What is the significance of "last time buy" status for BC549BTF?

A: Last time buy status indicates a defined end-of-life period during which the part remains available in production quantities. After this period, the part will no longer be manufactured. BC549BTF currently maintains substantial inventory (18,283 pcs) and is suitable for production use during its availability window.

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