BC549CG Equivalent & Substitute Parts

Part Overview

The BC549CG is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. It features a 30 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 625 mW power dissipation in a Through Hole TO-92 package. The BC549CG is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	100 mA
Power - Max	625 mW
Frequency - Transition	250 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15nA (ICBO)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-92-3

Substitute Part Grouping Explanation

Substitution of the BC549CG is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown rating must be 30 V or greater
Current - Collector (Ic) maximum must be 100 mA or greater
DC Current Gain (hFE) minimum must be 200 @ 2mA, 5V or greater
Vce Saturation must be 600mV @ 5mA, 100mA or lower
Current - Collector Cutoff (ICBO) must be 15nA or lower

Mechanical Equivalence Criteria:

Mounting type must be Through Hole
Package must be TO-92-3 compatible

The BC549BTA meets all electrical and mechanical substitution criteria for the BC549CG, with the exception of reduced maximum power dissipation (500 mW versus 625 mW) and increased transition frequency (300 MHz versus 250 MHz). These differences represent performance enhancements or neutral variations that do not restrict substitution in applications designed for the BC549CG.

Parameter Comparison

Parameter	BC549CG	BC549BTA
Manufacturer	onsemi	onsemi
Product Status	Obsolete	Active
Transistor Type	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V
Current - Collector (Ic) (Max)	100 mA	100 mA
Power - Max	625 mW	500 mW
Frequency - Transition	250 MHz	300 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	200 @ 2mA, 5V
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15nA (ICBO)	15nA (ICBO)
Operating Temperature	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99

Engineering Selection Recommendations

The BC549BTA is a direct substitute for the BC549CG based on electrical and mechanical parameter equivalence. The BC549BTA holds Active product status, ensuring continued availability and supply chain support, whereas the BC549CG is classified as Obsolete. The BC549BTA is RoHS3 Compliant, providing enhanced environmental and regulatory compliance compared to the BC549CG.

The BC549BTA exhibits a 20% reduction in maximum power dissipation (500 mW versus 625 mW). Applications requiring thermal margins approaching the 625 mW specification of the BC549CG must account for this difference in power budget calculations. The BC549BTA provides a 50 MHz increase in transition frequency (300 MHz versus 250 MHz), which represents improved high-frequency performance and does not restrict substitution in existing designs.

Both components share identical electrical characteristics for collector-emitter breakdown voltage, maximum collector current, DC current gain, saturation voltage, and cutoff current. Both are rated for the same operating temperature range (-55°C to 150°C). Both utilize Through Hole mounting in TO-92-3 packages and carry identical REACH and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the BC549BTA replace the BC549CG in all applications?

A: The BC549BTA meets all electrical and mechanical substitution criteria for the BC549CG. Applications must verify that the 500 mW maximum power dissipation of the BC549BTA is sufficient for the intended circuit. If the design operates near the 625 mW specification of the BC549CG, thermal analysis is required to confirm adequate margin with the BC549BTA.

Q: What is the difference in packaging between these parts?

A: Both the BC549CG and BC549BTA use Through Hole TO-92-3 packages. The BC549CG is supplied in standard TO-92 packaging, while the BC549BTA is supplied in TO-92-3 with formed leads. Both packages are mechanically compatible with standard TO-92 footprints and mounting hardware.

Q: Why is the BC549CG classified as Obsolete?

A: The BC549CG is listed as Obsolete by the manufacturer. The BC549BTA is the Active equivalent, ensuring continued manufacturing and supply availability. Designs using the BC549CG should transition to the BC549BTA for long-term procurement stability.

Q: Are there compliance differences between the BC549CG and BC549BTA?

A: The BC549BTA is RoHS3 Compliant, while the BC549CG does not carry this certification. Both components are REACH Unaffected and classified as EAR99 for export control purposes. Applications requiring RoHS3 compliance must use the BC549BTA.

Q: What is the impact of the 50 MHz frequency difference?

A: The BC549BTA provides 300 MHz transition frequency compared to 250 MHz for the BC549CG. This represents improved high-frequency performance and does not restrict substitution. Applications designed for the BC549CG will operate within specification with the BC549BTA.

Q: Are the electrical characteristics identical between these parts?

A: The BC549CG and BC549BTA share identical specifications for collector-emitter breakdown voltage (30 V), maximum collector current (100 mA), DC current gain (200 @ 2mA, 5V), saturation voltage (600mV @ 5mA, 100mA), and cutoff current (15nA ICBO). The primary differences are maximum power dissipation and transition frequency.

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