BC846CMTF Equivalent & Substitute Parts

Part Overview

The BC846CMTF is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This Surface Mount device operates at a maximum collector voltage of 65 V with a collector current rating of 100 mA and a transition frequency of 300 MHz. The part is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics, mechanical compatibility, and packaging specifications to ensure functional interchangeability in circuit designs.

Key Parameters

Parameter	BC846CMTF Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2 mA, 5 V	—
Power - Max	310	mW
Frequency - Transition	300	MHz
Package / Case	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—
Operating Temperature (TJ)	150	°C
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC846CMTF are identified based on the following critical parameters that determine functional interchangeability:

Primary Matching Criteria:

Transistor Type: NPN configuration
Package / Case: SOT-23-3 (TO-236) Surface Mount
Current - Collector (Ic) Max: 100 mA
Voltage - Collector Emitter Breakdown (Max): 65 V or greater
Vce Saturation characteristics: 600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max): 15 nA or lower
Mounting Type: Surface Mount

Secondary Considerations:

DC Current Gain (hFE) minimum specifications
Power dissipation rating
Frequency - Transition capability
Operating temperature range
RoHS and compliance certifications

Substitute parts are grouped into two categories: direct equivalents with identical electrical specifications and alternative parts with compatible but differing secondary parameters that remain suitable for the BC846CMTF application space.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	hFE Min @ 2mA, 5V	Power Max (mW)	Frequency (MHz)	Package	Temp Range (°C)
BC846CMTF	onsemi	100	65	420	310	300	SOT-23-3	—
BC846ALT1G	onsemi	100	65	110	300	100	SOT-23-3	-55 to 150
BC846ALT3G	onsemi	100	65	110	300	100	SOT-23-3	-55 to 150
BC846BLT1G	onsemi	100	65	200	300	100	SOT-23-3	-55 to 150
BC846BLT3G	onsemi	100	65	200	300	100	SOT-23-3	-55 to 150
MMBT2484LT1G	onsemi	100	60	250	225	—	SOT-23-3	-55 to 150
MMBT2484LT3G	onsemi	100	60	250	225	—	SOT-23-3	-55 to 150
MMBT6429LT1G	onsemi	200	45	500	225	700	SOT-23-3	-55 to 150
SBC846ALT1G	onsemi	100	65	110	300	100	SOT-23-3	-55 to 150
SBC846BLT1G	onsemi	100	65	200	300	100	SOT-23-3	-55 to 150
SBC846BLT3G	onsemi	100	65	200	300	100	SOT-23-3	-55 to 150

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Specifications):

The BC846ALT1G, BC846ALT3G, BC846BLT1G, and BC846BLT3G parts maintain the same collector current (100 mA), collector-emitter breakdown voltage (65 V), and saturation characteristics as the BC846CMTF. These parts differ primarily in DC current gain specifications and transition frequency. The BC846ALT series provides lower hFE (110 minimum), while the BC846BLT series provides higher hFE (200 minimum). Both are suitable for applications where the BC846CMTF is specified, provided the circuit design accommodates the different gain characteristics.

Automotive-Grade Alternatives:

The SBC846ALT1G, SBC846BLT1G, and SBC846BLT3G parts are automotive-qualified variants (AEC-Q101) of the BC846 series with identical electrical parameters to their commercial counterparts. These parts are appropriate for applications requiring automotive-grade components and maintain full compatibility with BC846CMTF specifications.

Limited Substitutes (Reduced Voltage or Current Ratings):

The MMBT2484LT1G and MMBT2484LT3G parts operate at a reduced collector-emitter breakdown voltage of 60 V (compared to 65 V) and lower power dissipation (225 mW versus 310 mW). These parts are suitable only for applications where the 60 V voltage rating is sufficient and power dissipation is not a limiting factor.

The MMBT6429LT1G part operates at a reduced collector-emitter breakdown voltage of 45 V and is not recommended as a direct substitute for the BC846CMTF in applications requiring the full 65 V rating.

Compliance and Certification:

All listed substitute parts maintain RoHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can BC846ALT1G replace BC846CMTF in all applications?

A: BC846ALT1G is electrically compatible with BC846CMTF in terms of voltage and current ratings. However, the hFE minimum specification differs (110 versus 420). Applications sensitive to current gain characteristics must evaluate circuit performance with the lower gain value. Both parts share identical package, mounting type, and compliance certifications.

Q: What is the difference between BC846BLT1G and BC846BLT3G?

A: BC846BLT1G and BC846BLT3G are electrically identical. The difference lies in packaging format: BC846BLT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BC846BLT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment and procurement requirements.

Q: Are SBC846 parts suitable replacements for BC846CMTF?

A: SBC846ALT1G, SBC846BLT1G, and SBC846BLT3G are automotive-qualified equivalents with identical electrical specifications to their BC846 counterparts. These parts are suitable replacements for BC846CMTF in applications requiring automotive-grade components. All maintain the same SOT-23-3 package and surface mount configuration.

Q: Why does MMBT2484LT1G have a lower voltage rating than BC846CMTF?

A: MMBT2484LT1G is rated for 60 V collector-emitter breakdown voltage compared to BC846CMTF at 65 V. This part is suitable only for applications where the 60 V rating is adequate. Applications requiring the full 65 V rating must use BC846 series parts or higher-rated alternatives.

Q: Can MMBT6429LT1G be used as a substitute for BC846CMTF?

A: MMBT6429LT1G is not recommended as a direct substitute. While it shares the SOT-23-3 package, it operates at a reduced collector-emitter breakdown voltage of 45 V (versus 65 V) and higher collector current rating of 200 mA. Use this part only in applications specifically designed for its electrical characteristics.

Q: What packaging options are available for BC846 equivalents?

A: BC846 equivalent parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel (BC846ALT1G, BC846BLT1G, BC846BLT3G), and Tape & Reel (TR) (BC846ALT3G, SBC846ALT1G, SBC846BLT1G, SBC846BLT3G). Selection depends on assembly process requirements and procurement volume.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and REACH unaffected status, ensuring compatibility with environmental and regulatory requirements equivalent to BC846CMTF.

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