BC856BMTF Equivalent & Substitute Parts

Part Overview

The BC856BMTF is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications in surface mount SOT-23-3 packaging. This device operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 65 V and a maximum power dissipation of 310 mW.

The BC856BMTF is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and legacy system support. Active alternatives with compatible electrical and mechanical specifications are available from onsemi and other manufacturers.

Key Parameters

Parameter	BC856BMTF Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	—
Power - Max	310	mW
Frequency - Transition	150	MHz
Operating Temperature (Max)	150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the BC856BMTF is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: PNP (must match exactly)
Current - Collector (Ic) (Max): 100 mA (must equal or exceed)
Voltage - Collector Emitter Breakdown (Max): 65 V (must equal or exceed)
Vce Saturation (Max) @ Ib, Ic: 650mV @ 5mA, 100mA (must match or be lower)
Current - Collector Cutoff (Max): 15 nA (must equal or be lower)
Package / Case: SOT-23-3 (must match exactly)
Mounting Type: Surface Mount (must match exactly)

Acceptable Variation Parameters:

DC Current Gain (hFE): May vary within manufacturer specifications
Power - Max: May be equal or higher
Frequency - Transition: May be equal or higher
Operating Temperature Range: May be wider
Product Status: Active status preferred for ongoing availability
RoHS Compliance: ROHS3 Compliant status preferred

Substitute parts are grouped into two categories:

Category 1: Direct onsemi Equivalents (BC856 Series) Parts BC856BLT1G, BC856ALT1G, BC856BLT3G maintain identical electrical specifications and packaging. These are active products with improved availability compared to the obsolete BC856BMTF.

Category 2: Automotive-Grade onsemi Equivalents (SBC856 Series) Parts SBC856ALT1G, SBC856BLT1G, SBC856BLT3G meet AEC-Q101 automotive qualification standards while maintaining identical electrical specifications and packaging. These are suitable for applications requiring automotive-grade components.

Category 3: Alternative Manufacturers Parts BC856,215 and BC856A,215 from Nexperia USA Inc., and BC856A-7-F from Diodes Incorporated maintain electrical compatibility with identical packaging and meet automotive qualification requirements.

Category 4: Higher Current Capability Part SMMBT2907ALT3G from onsemi provides higher collector current (600 mA) and higher transition frequency (200 MHz) while maintaining the same package and power rating. This part is suitable only for applications where the higher current capability does not create thermal or circuit design conflicts.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Freq (Max) MHz	Temp (Max) °C	Package	Status
BC856BMTF	onsemi	100	65	650	200	310	150	150	SOT-23-3	Obsolete
BC856BLT1G	onsemi	100	65	650	220	300	100	150	SOT-23-3	Active
BC856ALT1G	onsemi	100	65	650	125	300	100	150	SOT-23-3	Active
BC856BLT3G	onsemi	100	65	650	220	300	100	150	SOT-23-3	Active
SBC856ALT1G	onsemi	100	65	650	125	300	100	150	SOT-23-3	Active
SBC856BLT1G	onsemi	100	65	650	220	300	100	150	SOT-23-3	Active
SBC856BLT3G	onsemi	100	65	650	220	300	100	150	SOT-23-3	Active
SMMBT2907ALT3G	onsemi	600	60	1600	100	300	200	150	SOT-23-3	Active
BC856,215	Nexperia USA Inc.	100	65	650	125	250	100	150	SOT-23-3	Active
BC856A,215	Nexperia USA Inc.	100	65	650	125	250	100	150	SOT-23-3	Active
BC856A-7-F	Diodes Incorporated	100	65	650	125	300	200	150	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

BC856BLT1G, BC856BLT3G, and BC856ALT1G from onsemi are the preferred direct substitutes. These parts maintain identical electrical specifications and packaging to the BC856BMTF while offering active product status and improved long-term availability. The difference in packaging format (Cut Tape vs. Tape & Reel) does not affect electrical performance and is determined by procurement requirements.

Automotive-Grade Substitutes (For Automotive Applications)

SBC856ALT1G, SBC856BLT1G, and SBC856BLT3G are automotive-qualified alternatives carrying AEC-Q101 certification. These parts are suitable for applications requiring automotive-grade component qualification and maintain identical electrical specifications to the BC856BMTF.

Alternative Manufacturer Substitutes (For Multi-Source Requirements)

BC856,215 and BC856A,215 from Nexperia USA Inc., and BC856A-7-F from Diodes Incorporated provide equivalent electrical performance with identical packaging. These parts support multi-source procurement strategies and carry ROHS3 compliance and automotive qualification where specified. The BC856A-7-F offers higher transition frequency (200 MHz) compared to the BC856BMTF (150 MHz), providing additional performance margin.

Higher Current Alternative (For Specific Applications)

SMMBT2907ALT3G from onsemi provides 600 mA collector current capability compared to the 100 mA of the BC856BMTF. This part is suitable only for applications where the higher current capability is required and thermal design accommodates the increased power dissipation potential. The lower collector-emitter breakdown voltage (60 V vs. 65 V) and higher saturation voltage (1.6 V vs. 650 mV) must be evaluated against circuit requirements.

Compliance and Certification Status

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the environmental compliance profile of the BC856BMTF. Automotive-grade variants (SBC856 series) carry AEC-Q101 qualification for applications requiring automotive component standards.

Frequently Asked Questions (FAQ)

Q: Can BC856BLT1G be used as a direct replacement for BC856BMTF?

A: Yes. BC856BLT1G maintains identical electrical specifications including collector current (100 mA), collector-emitter breakdown voltage (65 V), saturation voltage (650 mV), and package format (SOT-23-3). The primary difference is product status: BC856BLT1G is active while BC856BMTF is obsolete. BC856BLT1G is available in higher quantities and offers improved long-term supply continuity.

Q: What is the difference between BC856BLT1G and BC856ALT1G?

A: Both parts are onsemi BC856 series transistors in SOT-23-3 packaging with identical electrical specifications. The primary difference is DC current gain (hFE): BC856BLT1G specifies 220 (Min) while BC856ALT1G specifies 125 (Min). Both values are within acceptable operating ranges for general-purpose switching applications. Selection between these parts depends on specific circuit gain requirements.

Q: Are SBC856 series parts suitable for non-automotive applications?

A: Yes. SBC856ALT1G, SBC856BLT1G, and SBC856BLT3G maintain identical electrical specifications to standard BC856 parts and carry automotive qualification (AEC-Q101). These parts can be used in non-automotive applications without restriction. Automotive qualification indicates higher reliability and quality standards, making these parts suitable for any application requiring equivalent performance.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are packaging and delivery formats that do not affect electrical performance. Cut Tape (CT) & Digi-Reel® is suitable for smaller quantity orders and manual assembly. Tape & Reel (TR) is optimized for high-volume automated assembly. The transistor itself is identical in both formats. Selection depends on production volume and assembly equipment capabilities.

Q: Can SMMBT2907ALT3G replace BC856BMTF in all applications?

A: SMMBT2907ALT3G is not a direct replacement. While it maintains the same package (SOT-23-3) and power rating (300 mW), it differs in critical electrical specifications: collector current is 600 mA (vs. 100 mA), collector-emitter breakdown voltage is 60 V (vs. 65 V), and saturation voltage is 1.6 V (vs. 650 mV). SMMBT2907ALT3G is suitable only for applications where higher current capability is required and the lower breakdown voltage and higher saturation voltage are acceptable.

Q: Are Nexperia and Diodes Incorporated parts equivalent to onsemi BC856 parts?

A: Yes. BC856,215 and BC856A,215 from Nexperia USA Inc., and BC856A-7-F from Diodes Incorporated maintain identical electrical specifications to onsemi BC856 parts including collector current (100 mA), collector-emitter breakdown voltage (65 V), saturation voltage (650 mV), and package format (SOT-23-3). These parts support multi-source procurement and carry equivalent compliance certifications (ROHS3, REACH Unaffected).

Q: What is the significance of the ",215" suffix in Nexperia part numbers?

A: The ",215" suffix in Nexperia part numbers (BC856,215 and BC856A,215) indicates the specific packaging variant and manufacturing code. This suffix does not affect electrical performance or compatibility. It is a Nexperia-specific designation for traceability and supply chain management.

Q: Does the BC856A-7-F from Diodes Incorporated have higher performance than BC856BMTF?

A: BC856A-7-F has a higher transition frequency (200 MHz vs. 150 MHz), providing additional frequency performance margin. However, the DC current gain (hFE) is lower (125 Min vs. 200 Min). Both parts maintain identical collector current (100 mA), collector-emitter breakdown voltage (65 V), and saturation voltage (650 mV). The higher transition frequency makes BC856A-7-F suitable for applications requiring improved high-frequency performance.

Q: What is the operating temperature range difference between BC856BMTF and its substitutes?

A: BC856BMTF specifies a maximum operating temperature of 150°C. Most active substitutes (BC856BLT1G, BC856ALT1G, SBC856 series, Nexperia parts) specify an operating temperature range of -55°C to 150°C, providing wider temperature margin. BC856A-7-F from Diodes Incorporated specifies -65°C to 150°C, offering the widest temperature range. These wider ranges do not affect compatibility and provide additional design margin for temperature-sensitive applications.

Q: Is RoHS3 compliance important for BC856 substitutes?

A: ROHS3 compliance is a regulatory requirement for electronic components in many markets. All recommended substitutes carry ROHS3 Compliant status, matching the environmental compliance profile of the BC856BMTF. This ensures compatibility with procurement requirements and regulatory standards for end-use applications.

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