BC547C-AP Equivalent & Substitute Parts Reference

Part Overview

The BC547C-AP is a Bipolar (BJT) NPN transistor manufactured by Micro Commercial Co, rated for 45V collector-emitter breakdown voltage and 100mA maximum collector current. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design support and procurement continuity. The BC547C-AP operates in the Through Hole TO-92 package and is suitable for general-purpose switching and amplification applications within the specified electrical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	—
Frequency - Transition	300	MHz
Power - Max	625	mW
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC547C-AP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor Type: NPN (identical)
Maximum Collector Current (Ic): 100 mA (identical)
Collector-Emitter Breakdown Voltage: 45 V (identical)
DC Current Gain (hFE) Minimum: 420 @ 2mA, 5V (identical)
Transition Frequency: 300 MHz (identical)

Mechanical & Environmental Criteria:

Mounting Type: Through Hole (identical)
Package / Case: TO-92-3 (identical)
RoHS Compliance: ROHS3 Compliant (identical)

The identified substitute parts BC547CTA and BC550CTA meet all electrical and mechanical equivalence requirements. Both are manufactured by onsemi and maintain active product status, ensuring long-term availability and supply chain stability. Differences in maximum power dissipation (625 mW vs. 500 mW) and Vce saturation characteristics are noted but do not preclude substitution within the specified operating parameters of the BC547C-AP.

Parameter Comparison

Parameter	BC547C-AP (Main)	BC547CTA (Substitute)	BC550CTA (Substitute)
Manufacturer	Micro Commercial Co	onsemi	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)	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 100mA	600mV @ 5mA, 100mA	600mV @ 5mA, 100mA
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	420 @ 2mA, 5V	420 @ 2mA, 5V
Power - Max	625 mW	500 mW	500 mW
Frequency - Transition	300 MHz	300 MHz	300 MHz
Operating Temperature (TJ)	-55 to 150 °C	150 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BC547CTA (onsemi) is the primary substitute for BC547C-AP. This part maintains identical electrical specifications and active product status with onsemi, ensuring consistent supply and technical support. The BC547CTA is packaged in Cut Tape (CT) format with 46,986 units in stock, providing immediate availability.

BC550CTA (onsemi) is an alternative substitute with equivalent electrical performance. The BC550CTA differs only in base product designation (BC550 vs. BC547) while maintaining all critical electrical parameters. This part is also manufactured by onsemi with active status and 13,720 units in stock.

Both substitute parts satisfy ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the original BC547C-AP. The transition from obsolete to active product status ensures long-term design support and procurement reliability.

Frequently Asked Questions (FAQ)

Q: Can BC547CTA directly replace BC547C-AP in existing designs?

A: Yes. BC547CTA maintains identical electrical specifications including collector current (100 mA), breakdown voltage (45 V), DC current gain (420 @ 2mA, 5V), and transition frequency (300 MHz). Both use the TO-92-3 Through Hole package. The primary difference is product status (active vs. obsolete) and packaging format (Cut Tape vs. bulk).

Q: What is the difference between BC547CTA and BC550CTA?

A: Both parts are electrically equivalent with identical maximum ratings and DC characteristics. The distinction is the base product series designation (BC547 vs. BC550). Selection between these parts depends on supplier availability and internal design documentation preferences.

Q: Are there differences in power dissipation between BC547C-AP and the substitutes?

A: Yes. BC547C-AP is rated for 625 mW maximum power dissipation, while BC547CTA and BC550CTA are rated for 500 mW. Designs operating below 500 mW are fully compatible. Designs requiring the full 625 mW rating must be re-evaluated for thermal management.

Q: Do the substitute parts have different saturation characteristics?

A: Yes. BC547C-AP specifies Vce saturation of 300mV @ 5mA, 100mA, while BC547CTA and BC550CTA specify 600mV @ 5mA, 100mA. This difference affects switching speed and power dissipation in saturation mode. Designs sensitive to saturation voltage must account for this parameter change.

Q: Are BC547CTA and BC550CTA suitable for the full operating temperature range of BC547C-AP?

A: BC547C-AP operates from -55°C to 150°C. BC547CTA and BC550CTA specify 150°C maximum junction temperature. Designs requiring operation below -55°C are not compatible with the substitute parts.

Q: What packaging formats are available for the substitute parts?

A: BC547CTA and BC550CTA are supplied in Cut Tape (CT) format. BC547C-AP was supplied in bulk. Cut Tape packaging is standard for active production parts and is compatible with automated assembly equipment.

Q: Are regulatory certifications maintained with the substitute parts?

A: Yes. Both BC547CTA and BC550CTA maintain ROHS3 compliance and REACH unaffected status, equivalent to BC547C-AP. No additional regulatory documentation is required for substitution.

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