BC856-QR Equivalent & Substitute Parts

Part Overview

The BC856-QR is an active production PNP bipolar junction transistor manufactured by Nexperia USA Inc. in the TO-236AB surface mount package. This component is designed for general-purpose switching and amplification applications requiring a 65 V collector-emitter breakdown voltage rating with 100 mA maximum collector current. The BC856-QR is AEC-Q101 qualified for automotive applications and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when design requirements necessitate alternative packaging formats, different manufacturer sourcing, or specific inventory availability while maintaining electrical and mechanical compatibility within the TO-236-3 / SOT-23-3 package family.

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)	125	@ 2mA, 5V
Power Dissipation (Max)	250	mW
Transition Frequency	100	MHz
Operating Temperature (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC856-QR are classified into two categories based on electrical and mechanical parameter alignment:

Parametric Equivalents maintain identical electrical specifications and automotive qualification. These parts differ only in packaging format (Cut Tape vs. Tape & Reel) or minor part number designations within the same manufacturer product line. Parametric equivalents include BC856,215 and BC856A,215 from Nexperia USA Inc., and BC856A-QR also from Nexperia USA Inc.

Similar Substitutes maintain core electrical parameters (collector current, breakdown voltage, saturation voltage, transition frequency, and DC current gain) but originate from a different manufacturer (Taiwan Semiconductor Corporation) and exhibit variations in secondary parameters. These parts include BC856A RFG and BC856B RFG. The BC856A RFG variant maintains a minimum DC current gain of 125, while BC856B RFG provides a higher minimum DC current gain of 220. Both similar substitutes operate across an extended temperature range of −55°C to 150°C and feature a reduced maximum power dissipation of 200 mW compared to the 250 mW rating of the main part.

Substitution eligibility is determined by the following key parameters:

Transistor polarity (PNP)
Maximum collector current (100 mA)
Collector-emitter breakdown voltage (65 V)
Saturation voltage characteristics (650 mV @ 5mA, 100mA)
Transition frequency (100 MHz)
Surface mount package compatibility (TO-236-3 / SOT-23-3)

Parameter Comparison

Parameter	BC856-QR	BC856,215	BC856A,215	BC856A-QR	BC856A RFG	BC856B RFG
Manufacturer	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	65 V	65 V	65 V	65 V	65 V	65 V
Vce Saturation (Max)	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA
Icbo (Max)	15 nA	15 nA	15 nA	15 nA	100 nA	100 nA
hFE (Min) @ 2mA, 5V	125	125	125	125	125	220
Power (Max)	250 mW	250 mW	250 mW	250 mW	200 mW	200 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Grade	Automotive	Automotive	Automotive	Automotive	—	—
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	—	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Parametric Equivalents (BC856,215, BC856A,215, BC856A-QR): These Nexperia USA Inc. parts maintain full electrical and compliance parity with the BC856-QR. Selection among these three is determined by packaging and supply requirements. BC856,215 is supplied in Cut Tape and Digi-Reel format, while BC856A,215 and BC856A-QR are supplied in Tape & Reel format. All three retain AEC-Q101 automotive qualification and ROHS3 compliance. These parts are direct substitutes for applications requiring identical electrical performance and automotive-grade reliability.

Similar Substitutes (BC856A RFG, BC856B RFG): These Taiwan Semiconductor Corporation parts maintain electrical compatibility for core switching and amplification functions but lack automotive qualification and AEC-Q101 certification. The BC856A RFG maintains the minimum DC current gain specification of 125, while BC856B RFG provides an elevated minimum DC current gain of 220. Both variants feature a reduced maximum power dissipation of 200 mW compared to the 250 mW rating of the main part and an extended operating temperature range of −55°C to 150°C. These parts are suitable for non-automotive applications where the reduced power rating and absence of automotive qualification are acceptable.

Selection of similar substitutes requires confirmation that the application does not mandate automotive-grade components or AEC-Q101 qualification. The elevated collector cutoff current (100 nA vs. 15 nA) in the similar substitutes may impact leakage-sensitive circuit designs.

Frequently Asked Questions (FAQ)

Q: Can BC856,215 be used as a direct replacement for BC856-QR?

A: Yes. BC856,215 is a parametric equivalent with identical electrical specifications, automotive qualification, and AEC-Q101 certification. The only difference is packaging format: BC856,215 is supplied in Cut Tape and Digi-Reel format, while BC856-QR is supplied in Tape & Reel format. Both are compatible with the same PCB footprint and solder reflow processes.

Q: What is the difference between BC856A,215 and BC856A-QR?

A: Both parts are parametric equivalents with identical electrical specifications and automotive qualification. The difference is in the part number designation and inventory sourcing. Both are supplied in Tape & Reel packaging and are electrically interchangeable with BC856-QR.

Q: Can Taiwan Semiconductor Corporation BC856A RFG or BC856B RFG be used in automotive applications?

A: BC856A RFG and BC856B RFG lack AEC-Q101 automotive qualification and automotive-grade designation. These parts are not suitable for applications requiring automotive-grade components or AEC-Q101 certification. Use of these parts in automotive designs requires explicit design review and customer approval.

Q: What is the difference between BC856A RFG and BC856B RFG?

A: Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications except for DC current gain. BC856A RFG specifies a minimum DC current gain (hFE) of 125 at 2 mA and 5 V, while BC856B RFG specifies a minimum DC current gain of 220 at the same conditions. Both feature 200 mW maximum power dissipation and extended temperature range of −55°C to 150°C.

Q: Why does BC856A RFG have a lower maximum power rating (200 mW) compared to BC856-QR (250 mW)?

A: The power rating difference reflects the thermal design characteristics of the Taiwan Semiconductor Corporation variant. Circuits designed for the 250 mW rating of BC856-QR must be re-evaluated if BC856A RFG or BC856B RFG are substituted to ensure power dissipation remains within the 200 mW limit.

Q: Are all substitute parts compatible with the same PCB footprint as BC856-QR?

A: Yes. All substitute parts use the TO-236-3 / SOT-23-3 surface mount package with identical pin configuration and footprint. No PCB layout modifications are required for mechanical compatibility.

Q: What is the significance of the collector cutoff current (Icbo) difference between Nexperia and Taiwan Semiconductor variants?

A: Nexperia parts specify a maximum Icbo of 15 nA, while Taiwan Semiconductor parts specify 100 nA. In circuits with high impedance paths or sensitive bias networks, the higher leakage current of Taiwan Semiconductor variants may introduce measurable bias drift or offset voltage changes. Circuit designs with tight DC operating point specifications should account for this parameter difference.

Q: Can BC856-QR be substituted with BC856B RFG in a high-current switching application?

A: BC856B RFG is electrically compatible for switching applications with identical saturation voltage and transition frequency. However, the reduced maximum power dissipation (200 mW vs. 250 mW) must be verified against actual circuit power dissipation. Additionally, the elevated DC current gain (220 vs. 125) may alter base drive requirements and switching transient behavior. Circuit performance validation is necessary before production use.

Q: What compliance certifications apply to each substitute part?

A: BC856-QR, BC856,215, BC856A,215, and BC856A-QR all carry AEC-Q101 automotive qualification and ROHS3 compliance. BC856A RFG and BC856B RFG carry ROHS3 compliance but lack AEC-Q101 automotive qualification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

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