BC857CW-G Equivalent & Substitute Parts

Part Overview

The BC857CW-G is an active PNP bipolar junction transistor manufactured by Comchip Technology, designed for surface mount applications in the SOT-323 package. This component operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 45 V and a transition frequency of 100 MHz. The part is RoHS3 compliant and carries unlimited moisture sensitivity level (MSL 1), making it suitable for general-purpose switching and amplification circuits. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and manufacturing certifications to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	650	mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15	nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	420	@ 2mA, 5V
Power - Max	150	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC857CW-G are classified into two categories based on electrical parameter alignment and manufacturing certifications:

Manufacturer Recommended Substitutes (MFR Recommended): Parts BC857CW,115 and BC857W,115 from Nexperia USA Inc. are designated as manufacturer-recommended alternatives. These parts maintain identical collector current (100 mA), collector-emitter breakdown voltage (45 V), transition frequency (100 MHz), and package specifications (SOT-323). Both parts carry AEC-Q101 automotive qualification and support higher maximum power dissipation (200 mW versus 150 mW). The primary distinction between these two parts is the DC current gain specification: BC857CW,115 maintains 420 hFE minimum, while BC857W,115 specifies 125 hFE minimum.

Parametric Equivalents: Parts BC857CWT1G and NSVBC857CWT1G from onsemi, and GSBC857CW from Good-Ark Semiconductor, are classified as parametric equivalents. These parts match all critical electrical parameters including collector current, breakdown voltage, saturation voltage, cutoff current, DC current gain, power dissipation, and transition frequency. All three parts are packaged in SOT-323 (SC-70-3) and maintain RoHS3 compliance and MSL 1 rating.

Key Parameters Determining Substitution:

Transistor Type: PNP
Collector Current (Ic) Max: 100 mA
Collector-Emitter Breakdown Voltage: 45 V
Transition Frequency: 100 MHz
Package: SOT-323 / SC-70
Surface Mount Configuration
RoHS3 Compliance

Parameter Comparison

Parameter	BC857CW-G (Comchip)	BC857CW,115 (Nexperia)	BC857W,115 (Nexperia)	BC857CWT1G (onsemi)	GSBC857CW (Good-Ark)	NSVBC857CWT1G (onsemi)
Manufacturer	Comchip Technology	Nexperia USA Inc.	Nexperia USA Inc.	onsemi	Good-Ark Semiconductor	onsemi
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)	45 V	45 V	45 V	45 V	45 V	45 V
Vce Saturation (Max)	650 mV @ 5mA, 100mA	600 mV @ 5mA, 100mA	600 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	15 nA	15 nA
hFE (Min) @ 2mA, 5V	420	420	125	420	420	420
Power (Max)	150 mW	200 mW	200 mW	150 mW	150 mW	150 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature	-65 to 150°C	to 150°C	to 150°C	-55 to 150°C	to 150°C	-55 to 150°C
Package	SOT-323	SOT-323	SOT-323	SC-70-3 (SOT323)	SOT-323	SC-70-3 (SOT323)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	—	Yes (AEC-Q101)	Yes (AEC-Q101)	—	—	—

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents): BC857CWT1G, GSBC857CW, and NSVBC857CWT1G provide direct electrical equivalence to the BC857CW-G. These parts maintain identical saturation voltage (650 mV), DC current gain (420 hFE minimum), and power dissipation (150 mW). Selection among these three should be based on availability, lead time, and supplier preference, as all three meet the same electrical and compliance requirements.

For Automotive Applications (MFR Recommended): BC857CW,115 and BC857W,115 from Nexperia are suitable when AEC-Q101 automotive qualification is required. Both parts support higher power dissipation (200 mW) and lower saturation voltage (600 mV), providing improved thermal and switching performance. BC857CW,115 maintains the original 420 hFE specification, while BC857W,115 operates with a lower minimum gain (125 hFE). Selection between these two depends on circuit gain requirements.

Compliance Considerations: All substitute parts maintain RoHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with standard manufacturing and storage conditions. No additional handling or environmental precautions are required beyond standard component management practices.

Frequently Asked Questions (FAQ)

Q: Can BC857CW,115 replace BC857CW-G in all applications? A: BC857CW,115 is a manufacturer-recommended substitute with identical electrical specifications for collector current, breakdown voltage, and transition frequency. The primary differences are higher power dissipation (200 mW versus 150 mW) and lower saturation voltage (600 mV versus 650 mV), which are improvements. AEC-Q101 automotive qualification is an additional feature. Direct replacement is supported.

Q: What is the difference between BC857CW,115 and BC857W,115? A: Both parts are from Nexperia with identical package, voltage, current, and frequency specifications. The key difference is DC current gain: BC857CW,115 specifies 420 hFE minimum, while BC857W,115 specifies 125 hFE minimum. Selection depends on circuit gain requirements. BC857CW,115 is preferred when higher gain is needed.

Q: Are onsemi BC857CWT1G and NSVBC857CWT1G interchangeable? A: Yes. Both parts are from onsemi with identical electrical parameters, package designation (SC-70-3 / SOT-323), and compliance ratings. NSVBC857CWT1G carries a different base product number (NSVBC857 versus BC857), but electrical specifications are equivalent. Selection can be based on availability and supplier preference.

Q: Does operating temperature range affect substitution? A: BC857CW-G specifies -65°C to 150°C, while BC857CWT1G and NSVBC857CWT1G specify -55°C to 150°C. If the application requires operation below -55°C, BC857CW-G or GSBC857CW must be used. For standard industrial applications (-40°C to 85°C), all substitutes are suitable.

Q: Can GSBC857CW from Good-Ark Semiconductor be used as a direct replacement? A: Yes. GSBC857CW matches all critical electrical parameters including collector current (100 mA), breakdown voltage (45 V), saturation voltage (650 mV), DC current gain (420 hFE), power dissipation (150 mW), and transition frequency (100 MHz). Package and compliance specifications are identical. Direct replacement is supported.

Q: What is the significance of higher power dissipation in Nexperia parts? A: BC857CW,115 and BC857W,115 support 200 mW maximum power dissipation compared to 150 mW in BC857CW-G. This provides additional thermal margin in applications with higher power requirements. Lower saturation voltage (600 mV versus 650 mV) also reduces power loss during saturation. These are performance improvements, not limitations.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed (BC857CW,115, BC857W,115, BC857CWT1G, GSBC857Cw, NSVBC857CWT1G) are RoHS3 compliant with unlimited moisture sensitivity level (MSL 1). No additional environmental or handling requirements apply.

Q: Which substitute part should be selected for new designs? A: For new designs requiring automotive qualification, BC857CW,115 is recommended due to AEC-Q101 certification and improved specifications. For general-purpose applications, BC857CWT1G or NSVBC857CWT1G from onsemi provide equivalent performance with established supply chains. Selection should prioritize availability and supplier relationships.

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