BC547TAR Equivalent & Substitute Parts

Part Overview

The BC547TAR is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. It features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and a transition frequency of 300 MHz. The device is housed in a TO-92-3 through-hole package with a maximum power dissipation of 500 mW.

The BC547TAR is classified as obsolete. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	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	110 @ 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)	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC547TAR is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

Transistor Type: NPN
Maximum Collector Current (Ic): 100 mA
Collector-Emitter Breakdown Voltage: 45 V
Vce Saturation: 600 mV @ 5 mA, 100 mA
Collector Cutoff Current (ICBO): 15 nA
DC Current Gain (hFE): 110 minimum @ 2 mA, 5 V
Maximum Power Dissipation: 500 mW
Transition Frequency: 300 MHz
Maximum Operating Temperature: 150 °C

Mechanical Parameters (Must Match):

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

The BC547ATA meets all specified electrical and mechanical parameters and qualifies as a parametric equivalent.

Parameter Comparison

Parameter	BC547TAR (onsemi)	BC547ATA (Fairchild Semiconductor)	Match
Transistor Type	NPN	NPN	✓
Current - Collector (Ic) (Max)	100 mA	100 mA	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	✓
Current - Collector Cutoff (Max)	15 nA	15 nA	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2 mA, 5 V	110 @ 2 mA, 5 V	✓
Power - Max	500 mW	500 mW	✓
Frequency - Transition	300 MHz	300 MHz	✓
Operating Temperature (TJ)	150 °C	150 °C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	✓
Product Status	Obsolete	Active	—

Engineering Selection Recommendations

The BC547ATA manufactured by Fairchild Semiconductor is a direct parametric equivalent to the BC547TAR. All electrical specifications, including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and frequency response, are identical. The mechanical package and through-hole mounting configuration are equivalent.

The BC547ATA holds active product status, ensuring ongoing availability and supply chain support. Both components carry identical export control classifications (ECCN: EAR99) and harmonized tariff codes (HTSUS: 8541.21.0075), confirming regulatory equivalence.

Selection of the BC547ATA as a substitute for the obsolete BC547TAR maintains full functional and mechanical compatibility in existing circuit designs without modification to PCB layouts or component footprints.

Frequently Asked Questions (FAQ)

Q: Can the BC547ATA be used as a direct replacement for the BC547TAR without circuit modification?

A: Yes. The BC547ATA is a parametric equivalent with identical electrical specifications and mechanical packaging. No circuit modifications are required.

Q: Are there differences in packaging between these parts?

A: No. Both the BC547TAR and BC547ATA use the TO-92-3 (TO-226AA) through-hole package with formed leads. PCB footprints and lead spacing are identical.

Q: What is the significance of the BC547TAR being obsolete?

A: Obsolete status indicates the BC547TAR is no longer manufactured by onsemi. The BC547ATA, with active product status, provides continued availability for new designs and replacement applications.

Q: Do these transistors have the same electrical performance characteristics?

A: Yes. Maximum collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and transition frequency are identical across all specified operating conditions.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both components share identical export control classifications and tariff codes, confirming regulatory equivalence for procurement and distribution.

Q: Can the BC547ATA be used in high-frequency applications?

A: Yes. The BC547ATA maintains the 300 MHz transition frequency specification, supporting small-signal amplification and switching applications across the specified frequency range.

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