BC548BRL1 Equivalent & Substitute Parts

Part Overview

The BC548BRL1 is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal amplification and switching applications. This device features a maximum collector current of 100 mA, collector-emitter breakdown voltage of 30 V, and transition frequency of 300 MHz in a through-hole TO-92 package. The BC548BRL1 is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility while offering active product status and continued availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Frequency - Transition	300	MHz
Power - Max	625	mW
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the BC548BRL1 are selected based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Primary Matching Criteria:

Transistor Type: NPN configuration
Maximum Collector Current: 100 mA
Collector-Emitter Breakdown Voltage: 30 V
Transition Frequency: 300 MHz
Mounting Type: Through Hole
Package Type: TO-92-3 (TO-226 series)

Secondary Compatibility Factors:

DC Current Gain (hFE) minimum specification at rated conditions
Collector Cutoff Current (ICBO) maximum specification
Power dissipation capability
Operating temperature range

The BC548BTA and BC548CTA meet all primary matching criteria and are classified as active products with current manufacturing status. Both devices are manufactured by Fairchild Semiconductor and maintain identical electrical performance in critical parameters including collector current, breakdown voltage, and transition frequency.

Parameter Comparison

Parameter	BC548BRL1 (onsemi)	BC548BTA (Fairchild)	BC548CTA (Fairchild)	Unit
Transistor Type	NPN	NPN	NPN	—
Current - Collector (Ic) Max	100	100	100	mA
Voltage - Collector Emitter Breakdown (Max)	30	30	30	V
Frequency - Transition	300	300	300	MHz
Power - Max	625	500	500	mW
DC Current Gain (hFE) Min @ Ic, Vce	200 @ 2mA, 5V	200 @ 2mA, 5V	420 @ 2mA, 5V	—
Current - Collector Cutoff (Max)	15	15	15	nA
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3	TO-92-3	TO-92-3	—
Operating Temperature (Max)	150	150	150	°C
Product Status	Obsolete	Active	Active	—

Engineering Selection Recommendations

BC548BTA Selection Criteria: The BC548BTA is suitable for applications requiring direct electrical equivalence to the BC548BRL1. This device maintains identical DC current gain specifications (200 minimum @ 2mA, 5V) and collector cutoff current characteristics. The BC548BTA is manufactured by Fairchild Semiconductor with active product status, ensuring continued availability and supply chain reliability. Power dissipation is rated at 500 mW, which is lower than the BC548BRL1 specification of 625 mW; circuit designs must verify that thermal requirements do not exceed this limit.

BC548CTA Selection Criteria: The BC548CTA provides enhanced DC current gain performance with a minimum specification of 420 @ 2mA, 5V, compared to 200 for the BC548BRL1. This higher gain characteristic is suitable for applications where increased amplification or reduced base drive current is beneficial. The BC548CTA maintains all other electrical parameters identical to the BC548BTA and is classified as an active product. The 500 mW power rating applies to this device as well.

Compliance and Certification: Both substitute parts carry identical ECCN (EAR99) and HTSUS (8541.21.0075) classifications as the original BC548BRL1. Both are supplied in bulk packaging with through-hole mounting configuration compatible with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can BC548BTA and BC548CTA be used interchangeably with BC548BRL1?

A: Both devices are electrically compatible substitutes for the BC548BRL1 in applications where the 500 mW power dissipation limit is acceptable. The primary difference is DC current gain specification: BC548BTA matches the original 200 minimum gain, while BC548CTA provides 420 minimum gain. Circuit performance depends on whether the application is gain-sensitive.

Q: What is the significance of the different DC current gain values?

A: DC current gain (hFE) determines the base current required to achieve a specified collector current. The BC548CTA requires less base drive current than BC548BRL1 or BC548BTA for the same collector current output. Applications with limited base drive capability benefit from the higher gain of BC548CTA.

Q: Are there thermal considerations when substituting BC548BRL1 with BC548BTA or BC548CTA?

A: The BC548BRL1 is rated for 625 mW maximum power dissipation, while both substitute parts are rated for 500 mW. Circuits dissipating power between 500 mW and 625 mW require thermal analysis to confirm operation within the 500 mW limit of substitute devices.

Q: Is the TO-92-3 package identical across all three devices?

A: All three devices use the TO-92-3 (TO-226 series) through-hole package with formed leads. Physical dimensions and PCB footprints are compatible. Pin configuration (Base, Collector, Emitter) is identical across all devices.

Q: What is the operating temperature range for substitute parts?

A: Both BC548BTA and BC548CTA specify a maximum junction temperature of 150°C, matching the BC548BRL1. The BC548BRL1 specifies a minimum operating temperature of -55°C; substitute part datasheets should be consulted for minimum temperature specifications if operation below 0°C is required.

Q: Are there RoHS or REACH compliance differences?

A: The BC548BRL1 is marked as RoHS non-compliant. Substitute part compliance status should be verified with the manufacturer if RoHS compliance is a design requirement.

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