BC548BRL1G Equivalent & Substitute Parts

Part Overview

The BC548BRL1G is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device features a 30 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 625 mW power dissipation rating in a through-hole TO-92 package. The BC548BRL1G is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage ratings, current specifications, and frequency response while accommodating available product status and packaging options.

Key Parameters

Parameter	BC548BRL1G	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	—
Power - Max	625	mW
Frequency - Transition	300	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC548BRL1G is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 30 V
Current - Collector (Ic) (Max): 100 mA
Vce Saturation (Max) @ Ib, Ic: 600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max): 15 nA
DC Current Gain (hFE) (Min) @ Ic, Vce: 200 @ 2 mA, 5 V (minimum threshold)
Frequency - Transition: 300 MHz
Mounting Type: Through Hole
Package / Case: TO-92-3 compatible

Direct Substitutes maintain all critical electrical parameters and package compatibility. These parts are functionally interchangeable in circuit applications where the BC548BRL1G was originally specified.

Similar Parts meet all critical electrical parameters but may exhibit variations in secondary characteristics such as DC current gain (hFE) specifications. These parts are suitable for applications where the higher gain specification does not create circuit performance issues.

Power dissipation differences (625 mW vs. 500 mW) do not disqualify substitutes when thermal design margins are adequate for the application's duty cycle and ambient conditions.

Parameter Comparison

Parameter	BC548BRL1G	BC548BTA	BC549BTA	BC549BTF	BC548CTA	Unit
Manufacturer	onsemi	Fairchild Semiconductor	onsemi	onsemi	Fairchild Semiconductor	—
Transistor Type	NPN	NPN	NPN	NPN	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	30	30	30	30	V
Current - Collector (Ic) (Max)	100	100	100	100	100	mA
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	15	15	15	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	200 @ 2 mA, 5 V	420 @ 2 mA, 5 V	—
Power - Max	625	500	500	500	500	mW
Frequency - Transition	300	300	300	300	300	MHz
Operating Temperature (Max)	150	150	150	150	150	°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-226-3, TO-92-3 Long Body	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	—
Product Status	Obsolete	Active	Active	Last Time Buy	Active	—

Engineering Selection Recommendations

BC548BTA (Fairchild Semiconductor) and BC549BTA (onsemi) are direct electrical equivalents to the BC548BRL1G, maintaining identical specifications across all critical parameters. Both parts are classified as Active, ensuring long-term availability and supply chain stability. BC548BTA is available in bulk packaging, while BC549BTA is supplied in cut tape format. Selection between these two should be based on packaging requirements and procurement logistics.

BC549BTF (onsemi) is functionally equivalent with Active product status designation, though classified as Last Time Buy. This part carries the highest current inventory (18,283 pieces) and represents a viable near-term substitute. Last Time Buy status indicates limited future availability; procurement decisions should account for long-term supply requirements.

BC548CTA (Fairchild Semiconductor) meets all critical electrical parameters with the exception of DC current gain specification, which is rated at 420 @ 2 mA, 5 V compared to the 200 minimum of the BC548BRL1G. This higher gain characteristic does not disqualify the part for substitution but requires circuit-level evaluation to confirm that increased gain does not adversely affect circuit stability, biasing, or frequency response in the target application.

All substitute parts comply with REACH regulations and carry EAR99 ECCN classification consistent with the original part. Power dissipation reduction from 625 mW to 500 mW across substitute options requires thermal margin verification in applications operating at maximum current and elevated ambient temperatures.

Frequently Asked Questions (FAQ)

Q: Can BC548BTA directly replace BC548BRL1G in existing designs?

A: Yes. BC548BTA maintains identical electrical specifications across voltage rating, current capacity, saturation voltage, cutoff current, DC current gain, and frequency response. The through-hole TO-92-3 package is mechanically compatible. Thermal design should account for the reduced power rating (500 mW vs. 625 mW) if the original design operated near maximum dissipation limits.

Q: What is the difference between BC549BTA and BC549BTF?

A: Both parts are electrically identical NPN transistors with matching specifications. The primary difference is packaging format: BC549BTA is supplied in cut tape, while BC549BTF is also supplied in cut tape. Both are manufactured by onsemi. BC549BTF carries Last Time Buy status, indicating limited future production; BC549BTA is classified as Active.

Q: Why does BC548CTA have a higher DC current gain specification?

A: BC548CTA is specified with a minimum DC current gain (hFE) of 420 @ 2 mA, 5 V, compared to 200 for the BC548BRL1G. This represents a different device grade within the BC548 family. Higher gain can affect biasing calculations and frequency response in circuits designed for the lower-gain variant. Circuit simulation or bench testing is appropriate when substituting with BC548CTA.

Q: Are all substitute parts RoHS compliant?

A: BC549BTA and BC549BTF are explicitly marked as ROHS3 Compliant. BC548BTA and BC548CTA do not list RoHS status in the provided specifications. Compliance verification should be obtained from the respective manufacturers if RoHS certification is a design requirement.

Q: What packaging options are available for substitutes?

A: BC548BTA is supplied in bulk packaging. BC549BTA and BC549BTF are supplied in cut tape format. All parts use the TO-92-3 through-hole package with formed leads, maintaining mechanical compatibility with the original BC548BRL1G footprint.

Q: Which substitute offers the best long-term availability?

A: BC548BTA and BC549BTA are both classified as Active, indicating ongoing production and supply. BC549BTF is classified as Last Time Buy, indicating limited future availability. For applications requiring extended component lifecycle support, BC548BTA or BC549BTA are preferred selections.

Q: Can substitutes be used in high-frequency applications?

A: All substitute parts maintain the 300 MHz transition frequency specification of the BC548BRL1G. Frequency-dependent circuit performance is preserved across all listed substitutes.

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