BC857BW-HF Equivalent & Substitute Parts

Part Overview

The BC857BW-HF 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 with unlimited moisture sensitivity rating and is currently in active production status.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility across manufacturing sources.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max)	650	mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min	220	@ 2mA, 5V
Power - Max	150	mW
Frequency - Transition	100	MHz
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 BC857BW-HF are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Transistor Type: PNP configuration
Current Rating: 100 mA maximum collector current
Voltage Rating: 45 V collector-emitter breakdown voltage
Saturation Characteristics: 650 mV Vce saturation at specified bias conditions
Current Gain: Minimum 220 hFE at 2 mA, 5 V
Power Dissipation: 150 mW maximum
Frequency Response: 100 MHz transition frequency
Package: SC-70 / SOT-323 surface mount configuration
Compliance: RoHS3 compliant with MSL 1 rating

All identified substitute parts meet these electrical specifications and are compatible with the same PCB footprint and reflow soldering processes.

Parameter Comparison

Parameter	BC857BW-HF (Comchip)	BC857BWT1G (onsemi)	SBC857BWT1G (onsemi)
Manufacturer	Comchip Technology	onsemi	onsemi
Transistor Type	PNP	PNP	PNP
Current - Collector (Ic) Max	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V
Vce Saturation (Max)	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA
DC Current Gain (hFE) Min	220 @ 2mA, 5V	220 @ 2mA, 5V	220 @ 2mA, 5V
Power - Max	150 mW	150 mW	150 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz
Operating Temperature	150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active
Grade	Standard	Standard	Automotive
Qualification	—	—	AEC-Q101

Engineering Selection Recommendations

BC857BWT1G (onsemi): This part is a parametric equivalent offering identical electrical specifications to the BC857BW-HF. Both parts are active production items with RoHS3 compliance and unlimited MSL rating. The BC857BWT1G is supplied in Cut Tape and Digi-Reel® packaging formats, providing flexibility for different assembly processes. The operating temperature range extends to -55°C, offering broader environmental coverage than the main part specification.

SBC857BWT1G (onsemi): This part meets all electrical and mechanical requirements of the BC857BW-HF with the additional qualification of AEC-Q101 automotive grade certification. The SBC857BWT1G is supplied in Tape & Reel format, matching the packaging format of the main part. This variant is suitable for applications requiring automotive-grade component qualification while maintaining identical electrical performance.

Both substitute parts are active production components with established supply availability and full RoHS3 compliance. Selection between substitutes depends on packaging format requirements and whether automotive-grade qualification is necessary for the application.

Frequently Asked Questions (FAQ)

Q: Can BC857BWT1G replace BC857BW-HF in existing designs?

A: Yes. The BC857BWT1G is a parametric equivalent with identical electrical specifications including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and transition frequency. Both parts use the same SC-70 / SOT-323 package and are compatible with existing PCB layouts and reflow profiles.

Q: What is the difference between BC857BWT1G and SBC857BWT1G?

A: Both parts are parametric equivalents with identical electrical performance. The primary difference is that SBC857BWT1G carries AEC-Q101 automotive-grade qualification, making it suitable for automotive applications. The SBC857BWT1G is supplied in Tape & Reel format, while BC857BWT1G is available in Cut Tape and Digi-Reel® formats.

Q: Are there packaging format differences between the main part and substitutes?

A: Yes. The BC857BW-HF is supplied in Tape & Reel (TR) format. The BC857BWT1G is available in Cut Tape (CT) and Digi-Reel® formats. The SBC857BWT1G is supplied in Tape & Reel (TR) format, matching the main part packaging. All three parts use the same SC-70 / SOT-323 surface mount package footprint.

Q: Do all parts meet RoHS3 compliance?

A: Yes. The BC857BW-HF, BC857BWT1G, and SBC857BWT1G are all RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the operating temperature range for each part?

A: The BC857BW-HF specifies a maximum junction temperature of 150°C. The BC857BWT1G and SBC857BWT1G specify an operating temperature range of -55°C to 150°C, providing extended low-temperature capability.

Q: Can SBC857BWT1G be used in non-automotive applications?

A: Yes. The SBC857BWT1G meets all electrical and mechanical specifications for general-purpose applications. The AEC-Q101 qualification is an additional certification that does not restrict use in non-automotive designs.

Q: Are the DC current gain specifications identical across all three parts?

A: Yes. All three parts specify a minimum DC current gain (hFE) of 220 at 2 mA collector current and 5 V collector-emitter voltage.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message