BC856CMTF Equivalent & Substitute Parts

Part Overview

The BC856CMTF is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a 65 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 310 mW power dissipation in a surface mount SOT-23-3 package. The BC856CMTF is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	65	V
Vce Saturation (Max)	650	mV @ 5mA, 100mA
Collector Cutoff Current (Max)	15	nA
DC Current Gain (hFE Min)	420	@ 2mA, 5V
Power Dissipation (Max)	310	mW
Transition Frequency	150	MHz
Operating Temperature (Max)	150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC856CMTF is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector current rating must be ≥ 100 mA
Collector-emitter breakdown voltage must be ≥ 65 V
Vce saturation must be ≤ 650 mV at specified bias conditions
Collector cutoff current must be ≤ 15 nA
DC current gain (hFE) must support the application requirements
Power dissipation must be ≥ 310 mW or application-dependent

Mechanical Compatibility Requirements:

Package must be SOT-23-3 (TO-236-3, SC-59) surface mount
Pinout must be identical (Base, Collector, Emitter)
Mounting type must be surface mount

Compliance Requirements:

RoHS3 compliance required
Moisture sensitivity level 1 acceptable

Substitute parts are grouped into two categories: standard industrial-grade parts and automotive-grade parts with AEC-Q101 qualification. All listed substitutes meet or exceed the electrical specifications of the BC856CMTF and maintain identical package and pinout compatibility.

Parameter Comparison

Part Number	Manufacturer	Status	Ic (Max) mA	Vce(br) V	hFE (Min) @ 2mA, 5V	Pmax mW	fT MHz	Tmax °C	Grade	Package
BC856CMTF	onsemi	Obsolete	100	65	420	310	150	150	Industrial	SOT-23-3
BC856ALT1G	onsemi	Active	100	65	125	300	100	150	Industrial	SOT-23-3
BC856BLT1G	onsemi	Active	100	65	220	300	100	150	Industrial	SOT-23-3
BC856BLT3G	onsemi	Active	100	65	220	300	100	150	Industrial	SOT-23-3
SBC856ALT1G	onsemi	Active	100	65	125	300	100	150	Automotive	SOT-23-3
SBC856BLT1G	onsemi	Active	100	65	220	300	100	150	Automotive	SOT-23-3
SBC856BLT3G	onsemi	Active	100	65	220	300	100	150	Automotive	SOT-23-3
BC856,215	Nexperia USA Inc.	Active	100	65	125	250	100	150	Automotive	SOT-23-3
BC856A,215	Nexperia USA Inc.	Active	100	65	125	250	100	150	Automotive	SOT-23-3
BC856A-7-F	Diodes Incorporated	Active	100	65	125	300	200	150	Industrial	SOT-23-3
BC856A-TP	Micro Commercial Co	Active	100	65	125	310	200	150	Industrial	SOT-23-3

Engineering Selection Recommendations

For Industrial Applications:

The BC856ALT1G, BC856BLT1G, and BC856BLT3G from onsemi are direct active replacements for the obsolete BC856CMTF. These parts maintain identical electrical specifications within acceptable tolerances and are available in high volume. The BC856BLT variants offer higher DC current gain (220 vs. 125), which may provide improved circuit performance in gain-sensitive applications. The BC856A-7-F from Diodes Incorporated and BC856A-TP from Micro Commercial Co offer enhanced transition frequency (200 MHz vs. 150 MHz), suitable for higher-speed switching applications.

For Automotive Applications:

The SBC856ALT1G, SBC856BLT1G, and SBC856BLT3G from onsemi are automotive-grade equivalents with AEC-Q101 qualification. These parts are suitable for automotive and harsh-environment applications requiring enhanced reliability screening. The Nexperia BC856,215 and BC856A,215 are also automotive-qualified alternatives with established supply chains.

Selection Criteria:

High-volume industrial applications: BC856BLT1G or BC856BLT3G (onsemi) for superior current gain and availability
Automotive or mission-critical applications: SBC856BLT1G or SBC856BLT3G (onsemi) for AEC-Q101 qualification
High-speed switching applications: BC856A-7-F (Diodes) or BC856A-TP (Micro Commercial) for 200 MHz transition frequency
Cost-optimized designs: BC856ALT1G or SBC856ALT1G for lower hFE specifications where gain is not limiting

All listed substitutes are RoHS3 compliant with MSL 1 rating and maintain identical SOT-23-3 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can BC856ALT1G replace BC856CMTF directly without circuit modification?

A: Yes. The BC856ALT1G is electrically and mechanically compatible with the BC856CMTF. Both devices share identical collector current (100 mA), breakdown voltage (65 V), saturation voltage (650 mV), and SOT-23-3 package specifications. The lower DC current gain (125 vs. 420) is acceptable in most applications; however, circuits relying on high current gain may require bias resistor adjustment.

Q: What is the difference between BC856BLT1G and BC856BLT3G?

A: Both parts are electrically identical with DC current gain of 220 and all other specifications matching. The primary difference is packaging: BC856BLT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BC856BLT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment and volume requirements.

Q: Are automotive-grade SBC856 parts required for non-automotive applications?

A: No. Automotive-grade SBC856 parts (SBC856ALT1G, SBC856BLT1G, SBC856BLT3G) are not required for standard industrial applications. These parts carry AEC-Q101 qualification and enhanced screening, making them suitable for automotive and high-reliability applications. Industrial-grade BC856 variants are appropriate for consumer and general industrial use.

Q: How does transition frequency affect circuit performance?

A: Transition frequency (fT) determines the maximum frequency at which the transistor maintains useful current gain. The BC856CMTF operates at 150 MHz, while BC856A-7-F and BC856A-TP operate at 200 MHz. For applications operating below 100 MHz, this difference is not significant. For high-speed switching or RF applications approaching 150 MHz or higher, the 200 MHz variants provide additional performance margin.

Q: Is the 310 mW power rating of BC856CMTF critical for substitution?

A: The 310 mW rating represents maximum power dissipation under worst-case conditions. Most substitute parts are rated at 300 mW, which is acceptable for applications where the BC856CMTF dissipates less than 300 mW. For applications requiring the full 310 mW capability, BC856A-TP (310 mW) is the appropriate choice. Verify actual power dissipation in your circuit design.

Q: Can I use BC856,215 or BC856A,215 from Nexperia as direct replacements?

A: Yes. Both Nexperia parts are electrically compatible with the BC856CMTF and maintain identical SOT-23-3 package specifications. The primary difference is power rating (250 mW vs. 310 mW). These parts are suitable for applications dissipating less than 250 mW and are automotive-qualified for mission-critical designs.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitutes are RoHS3 compliant, ensuring compatibility with modern manufacturing standards and environmental regulations.

Q: Are there any pinout differences between substitute parts?

A: No. All listed substitutes maintain identical SOT-23-3 pinout: Base (pin 1), Collector (pin 2), Emitter (pin 3). Direct board-level substitution is possible without PCB modification.

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