BC857C Equivalent & Substitute Parts

Part Overview

The BC857C is a PNP bipolar junction transistor manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the SOT-23 package. This component operates at a maximum collector current of 100 mA, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 200 mW. The BC857C is classified as an Active product with ROHS3 compliance and REACH unaffected status.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple suppliers is required for supply chain resilience. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating mechanical and packaging variations.

Key Parameters

Parameter	BC857C Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	650mV @ 5mA, 100mA	mV
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	420 @ 2mA, 5V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BC857C is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Transistor Type: PNP (mandatory match)
Current - Collector (Ic) Max: 100 mA (mandatory match)
Voltage - Collector Emitter Breakdown (Max): 45 V (mandatory match)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mandatory match for mechanical compatibility)
Mounting Type: Surface Mount (mandatory match)

Parameters Allowing Variation:

Vce Saturation: Substitute parts may vary within acceptable saturation characteristics
DC Current Gain (hFE): Substitute parts may have different gain specifications
Power - Max: Substitute parts may exceed the 200 mW specification
Frequency - Transition: Substitute parts may exceed the 100 MHz specification
Operating Temperature Range: Substitute parts may have different temperature limits
Packaging Format: Cut Tape (CT), Tape & Reel (TR), and other formats are interchangeable for the same component

Substitute parts are grouped based on manufacturer availability, packaging format, and compliance certifications. All listed substitutes maintain the core electrical specifications required for direct functional replacement.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	Vce Sat (mV)	hFE Min @ 2mA, 5V	Power Max (mW)	Freq Trans (MHz)	Temp Range (°C)	Package	Status
BC857C	Taiwan Semiconductor	100	45	650	420	200	100	-55 to 150	SOT-23	Active
BC857C RFG	Taiwan Semiconductor	100	45	650	420	200	100	-55 to 150	SOT-23	Active
BC857C-7-F	Diodes Incorporated	100	45	650	420	300	200	-65 to 150	SOT-23-3	Active
BC857C,215	Nexperia USA Inc.	100	45	650	420	250	100	-40 to 150	TO-236AB	Active
BC857C-TP	Micro Commercial Co	100	45	650	420	310	200	-55 to 150	SOT-23	Active
BC857BR TR PBFREE	Central Semiconductor	100	45	650	220	350	100	-65 to 150	SOT-23	Active
BC857B-TP	Micro Commercial Co	100	45	650	220	310	200	-55 to 150	SOT-23	Active
BC857BLT1G	onsemi	100	45	650	220	300	100	-55 to 150	SOT-23-3	Active
BC857A-TP	Micro Commercial Co	100	45	650	125	310	200	-55 to 150	SOT-23	Active
BC857AE6327HTSA1	Infineon Technologies	100	45	650	125	330	250	-40 to 150	PG-SOT23	Last Time Buy
2PB709ASL,215	Nexperia USA Inc.	100	45	500	290	250	80	-40 to 150	TO-236AB	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Identical Electrical Specifications):

BC857C RFG and BC857C-TP are direct parametric equivalents to the BC857C, maintaining identical collector current, breakdown voltage, saturation voltage, current gain, and transition frequency specifications. These parts differ only in packaging format (Tape & Reel versus standard packaging) and are suitable for direct substitution in all applications where the BC857C is specified.

Functionally Compatible Substitutes (Electrical Parameters Within Specification):

BC857C-7-F (Diodes Incorporated) maintains all critical electrical parameters while offering enhanced power dissipation (300 mW versus 200 mW) and higher transition frequency (200 MHz versus 100 MHz). This part is suitable for applications requiring improved thermal performance or higher frequency operation.

BC857C,215 (Nexperia USA Inc.) is qualified to AEC-Q101 automotive standards and maintains identical electrical specifications to the BC857C. This part is appropriate for automotive-grade applications requiring formal qualification documentation.

BC857BR TR PBFREE (Central Semiconductor) provides extended operating temperature range (-65°C to 150°C) and higher power dissipation (350 mW) while maintaining core electrical specifications. This part is suitable for applications requiring enhanced thermal or temperature performance.

Alternative Gain Grades:

BC857B-TP and BC857BLT1G represent the B-grade variant with DC current gain (hFE) of 220 at 2 mA, 5V, compared to the C-grade specification of 420. These parts are suitable for applications where lower gain is acceptable or preferred.

BC857A-TP and BC857AE6327HTSA1 represent the A-grade variant with DC current gain (hFE) of 125 at 2 mA, 5V. These parts are suitable for applications with specific gain requirements or where lower gain characteristics are beneficial.

Compliance and Certification:

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status. BC857C,215 carries AEC-Q101 automotive qualification. BC857AE6327HTSA1 is classified as Last Time Buy and should not be selected for new designs requiring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can BC857C-7-F be used as a direct replacement for BC857C?

A: Yes. BC857C-7-F maintains all critical electrical parameters: 100 mA collector current, 45 V breakdown voltage, 650 mV saturation voltage, and 420 hFE minimum gain. The higher power dissipation (300 mW versus 200 mW) and transition frequency (200 MHz versus 100 MHz) provide enhanced performance margins. The SOT-23-3 package is mechanically compatible with SOT-23 applications.

Q: What is the difference between BC857C and BC857B variants?

A: The primary difference is DC current gain (hFE). BC857C specifies minimum hFE of 420 at 2 mA, 5V, while BC857B specifies minimum hFE of 220. All other electrical parameters remain identical. BC857B is suitable for applications where lower gain is acceptable or where gain matching is not critical.

Q: Are BC857C,215 and BC857C functionally equivalent?

A: Yes. BC857C,215 maintains identical electrical specifications to BC857C and is qualified to AEC-Q101 automotive standards. The primary difference is the TO-236AB package designation and automotive qualification. This part is suitable for automotive applications requiring formal qualification documentation.

Q: Can BC857A variants be substituted for BC857C?

A: BC857A variants have significantly lower DC current gain (125 hFE minimum versus 420 for BC857C). Substitution is possible only in applications where the lower gain specification is acceptable. Circuit designs relying on specific gain characteristics may require redesign or bias network adjustment.

Q: What packaging formats are available for BC857C equivalents?

A: Substitute parts are available in Cut Tape (CT), Tape & Reel (TR), and Digi-Reel formats. All maintain the same SOT-23 or TO-236AB mechanical package. Packaging format selection depends on manufacturing process requirements and does not affect electrical performance.

Q: Is BC857AE6327HTSA1 suitable for new designs?

A: BC857AE6327HTSA1 is classified as Last Time Buy. This designation indicates the manufacturer has announced end-of-life status. This part should not be selected for new designs requiring long-term component availability. Alternative active-status parts such as BC857C-7-F or BC857C-TP are recommended for new designs.

Q: What is the significance of the RFG suffix in BC857C RFG?

A: The RFG suffix indicates a specific packaging or distribution format from Taiwan Semiconductor Corporation. BC857C RFG maintains identical electrical specifications to standard BC857C and is suitable for direct substitution. The suffix reflects internal manufacturer coding and does not affect functional compatibility.

Q: Can 2PB709ASL,215 replace BC857C in all applications?

A: 2PB709ASL,215 maintains the critical parameters of 100 mA collector current and 45 V breakdown voltage. However, it differs in saturation voltage (500 mV versus 650 mV), DC current gain (290 versus 420), and transition frequency (80 MHz versus 100 MHz). Substitution is possible in applications where these parameter variations are acceptable, but circuit performance may differ.

Q: What temperature range should be considered when selecting a substitute?

A: The BC857C operates from -55°C to 150°C. Substitute parts maintain this range or extend it. BC857C-7-F and BC857BR TR PBFREE extend the lower limit to -65°C. Selection should match the application's thermal requirements. Parts with extended temperature ranges provide additional margin but do not affect performance within the standard range.

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