BC848AMTF Equivalent & Substitute Parts

Part Overview

The BC848AMTF is an NPN bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device is rated for 30 V collector-emitter breakdown voltage and 100 mA maximum collector current, with a maximum power dissipation of 310 mW. The BC848AMTF is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements where the original part is no longer manufactured or stocked.

Key Parameters

Parameter	BC848AMTF
Transistor Type	NPN
Collector Current (Ic) Max	100 mA
Collector-Emitter Breakdown Voltage (Max)	30 V
Power Dissipation (Max)	310 mW
Frequency - Transition	300 MHz
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Operating Temperature (Max)	150°C (TJ)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the BC848AMTF is determined by strict electrical and mechanical compatibility based on the following parameters:

Critical Matching Parameters:

Transistor Type: NPN (must match exactly)
Package / Case: SOT-23-3 surface mount (must match exactly for PCB compatibility)
Collector Current (Ic) Max: 100 mA minimum (equal or greater)
Collector-Emitter Breakdown Voltage: 30 V minimum (equal or greater)
Power Dissipation: 310 mW minimum (equal or greater)
Vce Saturation: 600 mV @ 5 mA, 100 mA (must match or be lower)
Collector Cutoff Current (ICBO): 15 nA maximum (must match or be lower)

Secondary Parameters (Application-Dependent):

DC Current Gain (hFE): Varies by grade (A, B, C grades available)
Frequency - Transition: 300 MHz or greater acceptable for most applications
Operating Temperature Range: Extended range (-55°C to 150°C) provides additional margin

Substitute parts are grouped into two categories:

Direct Equivalents (BC848 Series): Parts with identical base product number (BC848) and matching electrical specifications. These include BC848ALT1G, BC848BLT1G, BC848BLT3G, and BC848CLT1G. All maintain 30 V breakdown voltage, 100 mA collector current, and SOT-23-3 packaging. These parts are active product status and RoHS3 compliant.
Functional Equivalents (BC849 and BCW Series): Parts with compatible electrical ratings but different base product numbers. BC849BLT1G and BC849CLT1G maintain identical electrical specifications to BC848 variants. BCW32LT1G and BCW33LT1G offer 32 V breakdown voltage (higher margin) with 100 mA collector current. MMBT2222LT1G provides higher collector current capability (600 mA) while maintaining 30 V breakdown voltage and SOT-23-3 packaging.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	hFE @ 2mA, 5V	Frequency (MHz)	Package	Status	RoHS
BC848AMTF	onsemi	100 mA	30 V	310 mW	110	300	SOT-23-3	Obsolete	-
BC848ALT1G	onsemi	100 mA	30 V	300 mW	110	100	SOT-23-3	Active	ROHS3
BC848BLT1G	onsemi	100 mA	30 V	300 mW	200	100	SOT-23-3	Active	ROHS3
BC848BLT3G	onsemi	100 mA	30 V	300 mW	200	100	SOT-23-3	Active	ROHS3
BC848CLT1G	onsemi	100 mA	30 V	300 mW	420	100	SOT-23-3	Active	ROHS3
BC849BLT1G	onsemi	100 mA	30 V	300 mW	200	100	SOT-23-3	Active	ROHS3
BC849CLT1G	onsemi	100 mA	30 V	300 mW	420	100	SOT-23-3	Active	ROHS3
BCW32LT1G	onsemi	100 mA	32 V	225 mW	200	-	SOT-23-3	Active	ROHS3
BCW33LT1G	onsemi	100 mA	32 V	300 mW	420	-	SOT-23-3	Active	ROHS3
BCW33LT3G	onsemi	100 mA	32 V	300 mW	420	-	SOT-23-3	Active	ROHS3
MMBT2222LT1G	onsemi	600 mA	30 V	300 mW	100	250	SOT-23-3	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

BC848ALT1G, BC848BLT1G, BC848BLT3G, and BC848CLT1G are direct substitutes for the BC848AMTF. All four parts maintain identical electrical specifications for collector current (100 mA), collector-emitter breakdown voltage (30 V), and package format (SOT-23-3). These parts are active product status with ROHS3 compliance, ensuring long-term availability and regulatory compliance. Selection among these four variants depends on DC current gain (hFE) requirements: BC848ALT1G and BC848BLT1G/BLT3G provide hFE of 110 and 200 respectively, while BC848CLT1G provides hFE of 420. The primary difference between BC848BLT1G and BC848BLT3G is packaging format (Cut Tape vs. Tape & Reel).

Secondary Substitutes (Functional Equivalents):

BC849BLT1G and BC849CLT1G are functionally equivalent to BC848 variants with identical electrical ratings. These parts differ only in base product number designation and are available in Tape & Reel packaging. Selection between BC848 and BC849 series depends on packaging requirements and inventory availability.

BCW32LT1G and BCW33LT1G offer higher collector-emitter breakdown voltage (32 V vs. 30 V), providing additional voltage margin in applications. BCW32LT1G provides hFE of 200, while BCW33LT1G and BCW33LT3G provide hFE of 420. Power dissipation for BCW32LT1G is 225 mW, which is lower than the original BC848AMTF specification of 310 mW. BCW33LT1G and BCW33LT3G maintain 300 mW power dissipation. All BCW series parts are active product status with ROHS3 compliance.

Higher Current Alternative:

MMBT2222LT1G is suitable for applications requiring higher collector current capability (600 mA vs. 100 mA) while maintaining 30 V breakdown voltage and SOT-23-3 packaging. This part is active product status with ROHS3 compliance. Selection of MMBT2222LT1G is appropriate only when circuit design permits higher current handling and hFE of 100 is acceptable.

All recommended substitutes are manufactured by onsemi, maintain SOT-23-3 surface mount packaging, and are ROHS3 compliant. All substitute parts are active product status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can BC848ALT1G directly replace BC848AMTF without circuit modification?

A: Yes. BC848ALT1G maintains identical electrical specifications for collector current (100 mA), collector-emitter breakdown voltage (30 V), Vce saturation (600 mV @ 5 mA, 100 mA), and package format (SOT-23-3). The primary difference is product status (active vs. obsolete) and RoHS3 compliance. No circuit modification is required.

Q: What is the difference between BC848BLT1G and BC848BLT3G?

A: Both parts have identical electrical specifications. The difference is packaging format: BC848BLT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BC848BLT3G is supplied in Tape & Reel (TR) format. Selection depends on manufacturing equipment and volume requirements.

Q: Can I use BC848CLT1G instead of BC848ALT1G?

A: Yes, BC848CLT1G is a direct substitute. The difference is DC current gain (hFE): BC848CLT1G provides hFE of 420 at 2 mA, 5 V, compared to BC848ALT1G at 110. Higher hFE may affect circuit biasing and gain characteristics. Circuit analysis is required to confirm compatibility with the higher gain specification.

Q: Why would I choose BCW33LT1G over BC848BLT1G?

A: BCW33LT1G offers higher collector-emitter breakdown voltage (32 V vs. 30 V), providing additional voltage margin in applications operating near maximum ratings. Both parts maintain 100 mA collector current and SOT-23-3 packaging. Selection depends on circuit voltage requirements and design margin preferences.

Q: Is MMBT2222LT1G compatible with BC848AMTF applications?

A: MMBT2222LT1G is compatible only in applications where higher collector current (600 mA vs. 100 mA) is acceptable and circuit design permits this change. The part maintains 30 V breakdown voltage and SOT-23-3 packaging. DC current gain (hFE of 100) is lower than BC848AMTF (hFE of 110), which may affect circuit performance. Circuit analysis is required to confirm compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (BC848ALT1G, BC848BLT1G, BC848BLT3G, BC848CLT1G, BC849BLT1G, BC849CLT1G, BCW32LT1G, BCW33LT1G, BCW33LT3G, and MMBT2222LT1G) are ROHS3 compliant. The original BC848AMTF does not specify RoHS status.

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

A: All substitute parts operate from -55°C to 150°C (TJ), providing extended temperature range compared to the BC848AMTF specification of 150°C maximum. This extended range provides additional design margin for temperature-sensitive applications.

Q: Can I mix different BC848 grades (A, B, C) in the same circuit?

A: Yes, provided circuit design accounts for DC current gain (hFE) variation. BC848A grade provides hFE of 110, BC848B grade provides hFE of 200, and BC848C grade provides hFE of 420. Circuits with fixed biasing resistors may exhibit different operating points with different grades. Circuits with emitter degeneration or feedback biasing are less sensitive to hFE variation.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: All substitute parts have MSL of 1 (Unlimited), indicating no moisture sensitivity restrictions. Parts can be stored and handled without special moisture control measures.

Q: Are substitute parts available in different packaging formats?

A: Yes. BC848ALT1G, BC848BLT1G, and BC848CLT1G are available in Cut Tape (CT) & Digi-Reel format. BC848BLT3G, BC849BLT1G, BC849CLT1G, BCW32LT1G, BCW33LT1G, BCW33LT3G, and MMBT2222LT1G are available in Tape & Reel (TR) format. Selection depends on manufacturing equipment compatibility and volume requirements.

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