Equivalent & Substitute Parts for BC548B

Part Overview

The BC548B is a Bipolar Junction Transistor (BJT) NPN type, rated for 30 V collector-emitter voltage, 100 mA collector current, and 500 mW power dissipation, supplied in a TO-92 through-hole package. This product is listed as active and is compliant with RoHS3 and REACH standards. Sourcing equivalent and substitute models within the "Transistors, Bipolar (BJT)" category is necessary to manage inventory continuity, production flexibility, and sourcing resilience without deviating from the specified electrical and mechanical constraints.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V
Current - Collector (Ic) (Max)	100 mA
Current - Collector Cutoff (ICBO) (Max)	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V
Power - Max	500 mW
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
Part Status	Active

Substitute Part Grouping Explanation

Substitute part selection is strictly based on the following key parameters: transistor type (NPN), maximum collector-emitter voltage rating, maximum collector current rating, collector cutoff current, minimum DC current gain at the specified test conditions, maximum power dissipation, mounting type, and package. Only parts matching or exceeding these parameters within the same package and compliance category can be considered substitutes.

Parameter Comparison

Parameter	Main Part: BC548B (Taiwan Semiconductor)	Substitute: BC546ABU (onsemi)
Transistor Type	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30 V	65 V
Current - Collector (Ic) (Max)	100 mA	100 mA
Current - Collector Cutoff (ICBO) (Max)	15 nA	15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	110 @ 2mA, 5V
Power - Max	500 mW	500 mW
Mounting Type	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected
Part Status	Active	Active

Engineering Selection Recommendations

Both the BC548B and BC546ABU are listed as active, RoHS3 compliant, and REACH unaffected. Each part meets international compliance standards and is suitable for ecologically regulated applications according to the provided statuses and certifications.

Frequently Asked Questions (FAQ)

Q: What criteria are used for considering a substitute BJT transistor in this context?
A: Substitutes are selected based on matching or exceeding voltage, current, power, transistor type (NPN), cutoff current, minimum current gain, mounting type, package, and environmental compliance.

Q: Are the BC548B and BC546ABU compatible in terms of mounting and package type?
A: Both parts use the TO-226-3, TO-92-3 (TO-226AA) through-hole package, ensuring mechanical compatibility.

Q: Does the substitute meet the same or higher maximum voltage and current ratings?
A: The BC546ABU features equal or higher ratings for maximum voltage (65 V vs. 30 V) and the same maximum current (100 mA).

Q: Are both parts compliant with RoHS3 and REACH requirements?
A: Both BC548B and BC546ABU are RoHS3 compliant and REACH unaffected as per the provided data.

Q: What about differences in DC current gain (hFE)?
A: The BC546ABU has a lower specified minimum DC current gain (110) compared to the BC548B (200) at the specified test point.

Q: How does the part status inform substitute selection?
A: Both parts are active, supporting long-term availability and sourcing within approved supply chains.

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