BC547-AP Equivalent & Substitute Parts

Part Overview

The BC547-AP is a small-signal NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 45 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is classified as obsolete, which necessitates identification of active equivalent parts for continued circuit implementation. The BC547-AP operates across a wide temperature range of -55°C to 150°C and is housed in a TO-92 through-hole package suitable for general-purpose amplification and switching applications.

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	110 @ 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 of the BC547-AP is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor polarity: NPN configuration
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 45 V
DC current gain (hFE): minimum 110 at specified bias conditions
Transition frequency: 300 MHz
Through-hole mounting in TO-92 package

The BC547ATA manufactured by Fairchild Semiconductor satisfies all critical electrical parameters and maintains identical package geometry. Both devices operate within compatible temperature ranges and share the same ECCN and HTSUS classifications, confirming regulatory equivalence.

Parameter Comparison

Parameter	BC547-AP (Micro Commercial Co)	BC547ATA (Fairchild Semiconductor)	Match Status
Transistor Type	NPN	NPN	Equivalent
Current - Collector (Ic) Max	100 mA	100 mA	Equivalent
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	Equivalent
DC Current Gain (hFE) Min @ Ic, Vce	110 @ 2mA, 5V	110 @ 2mA, 5V	Equivalent
Frequency - Transition	300 MHz	300 MHz	Equivalent
Operating Temperature (Max)	150°C	150°C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-92-3	TO-92-3	Equivalent
Power - Max	625 mW	500 mW	BC547ATA rated lower
Vce Saturation (Max) @ Ib, Ic	300mV @ 5mA, 100mA	600mV @ 5mA, 100mA	BC547ATA rated higher
ECCN	EAR99	EAR99	Equivalent
HTSUS	8541.21.0075	8541.21.0075	Equivalent

Engineering Selection Recommendations

The BC547ATA is a direct electrical and mechanical substitute for the BC547-AP. Both devices are classified under the same ECCN and HTSUS codes, confirming regulatory alignment. The BC547-AP is marked as obsolete, while the BC547ATA maintains active product status with significantly higher inventory availability (16,814 units in stock versus 1,115 units for the BC547-AP).

Electrical performance differences exist in two parameters: the BC547ATA is rated for 500 mW maximum power dissipation compared to 625 mW for the BC547-AP, and the BC547ATA exhibits higher saturation voltage (600 mV versus 300 mV at specified bias conditions). These differences must be evaluated within the context of the specific circuit application to determine acceptability.

Both devices are ROHS3 compliant and carry identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the BC547ATA directly replace the BC547-AP in existing circuit designs?

A: The BC547ATA satisfies all critical electrical parameters (collector current, breakdown voltage, current gain, and transition frequency) and maintains identical TO-92 package geometry. However, the reduced maximum power rating (500 mW versus 625 mW) and increased saturation voltage (600 mV versus 300 mV) require circuit-level evaluation to confirm suitability for the specific application.

Q: What is the primary reason for substituting the BC547-AP?

A: The BC547-AP is classified as obsolete. The BC547ATA is an active product with substantially higher inventory availability, ensuring long-term supply chain continuity.

Q: Are there package compatibility concerns?

A: Both the BC547-AP and BC547ATA are housed in the TO-92-3 (TO-226AA) package with formed leads. Pin configuration and physical dimensions are identical, permitting direct board-level substitution without layout modifications.

Q: How do the power dissipation differences affect substitution?

A: The BC547ATA is rated for 500 mW maximum power dissipation, which is 125 mW lower than the BC547-AP (625 mW). Applications operating near the upper thermal limits of the BC547-AP may require thermal analysis to confirm the BC547ATA operates within acceptable junction temperature ranges.

Q: What is the significance of the saturation voltage difference?

A: The BC547ATA exhibits saturation voltage of 600 mV at 5 mA base current and 100 mA collector current, compared to 300 mV for the BC547-AP. In switching applications where saturation voltage directly affects circuit performance, this parameter difference must be evaluated against circuit design margins.

Q: Are regulatory and compliance certifications equivalent?

A: Both devices carry identical ECCN (EAR99), HTSUS (8541.21.0075), and ROHS3 compliance designations. Regulatory and export control requirements are equivalent between the two parts.

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