BC856BW-HF Equivalent & Substitute Parts

Part Overview

The BC856BW-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 65 V and a transition frequency of 100 MHz. The device is rated for 150 mW maximum power dissipation and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and component availability across different manufacturing sources while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	220 @ 2 mA, 5 V	—
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 (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC856BW-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: 65 V collector-emitter breakdown voltage
Saturation Characteristics: 650 mV Vce saturation at specified base and collector currents
Gain Specification: Minimum DC current gain (hFE) of 220 at 2 mA collector current and 5 V Vce
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 available in the same physical package, enabling direct functional replacement in circuit designs.

Parameter Comparison

Parameter	BC856BW-HF (Comchip)	BC856BWT1G (onsemi)	SBC856BWT1G (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)	65 V	65 V	65 V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA (ICBO)	15 nA (ICBO)	15 nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	220 @ 2 mA, 5 V	220 @ 2 mA, 5 V	220 @ 2 mA, 5 V
Power - Max	150 mW	150 mW	150 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz
Operating Temperature Range	Up to 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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Grade	Standard	Standard	Automotive
Qualification	—	—	AEC-Q101

Engineering Selection Recommendations

BC856BWT1G (onsemi): This part is a parametric equivalent to the BC856BW-HF with identical electrical specifications. It is manufactured by onsemi, an active product with ROHS3 compliance and unlimited MSL rating. The operating temperature range extends to -55°C, providing broader environmental coverage than the main part. This substitute is suitable for general-purpose applications requiring standard-grade PNP transistor functionality.

SBC856BWT1G (onsemi): This part meets all electrical specifications of the BC856BW-HF and carries automotive-grade qualification under AEC-Q101 standard. The SBC856BWT1G is designated for automotive applications and provides the same electrical performance with extended temperature range (-55°C to 150°C). Selection of this part is appropriate for designs requiring automotive-grade components or AEC-Q101 certification compliance.

Both substitute parts are active products with established supply availability and are suitable for direct replacement in circuit designs where the BC856BW-HF is specified, provided that application requirements do not mandate a specific manufacturer or grade designation.

Frequently Asked Questions (FAQ)

Q: Can BC856BWT1G and SBC856BWT1G be used interchangeably with BC856BW-HF?

A: Both parts are parametric equivalents with identical electrical specifications for collector current, breakdown voltage, saturation characteristics, gain, power dissipation, and frequency response. They are packaged in the same SC-70 / SOT-323 surface mount configuration. The primary difference is that SBC856BWT1G carries automotive-grade qualification (AEC-Q101), while BC856BWT1G is standard-grade. Selection depends on application requirements and qualification mandates.

Q: What is the significance of the operating temperature range difference?

A: The BC856BW-HF specifies operation up to 150°C junction temperature. Both onsemi substitutes (BC856BWT1G and SBC856BWT1G) specify -55°C to 150°C operating range, providing lower temperature operation capability. This extended range does not affect substitution suitability for applications operating within the BC856BW-HF temperature specification.

Q: Are all three parts ROHS3 compliant?

A: Yes. The BC856BW-HF, BC856BWT1G, and SBC856BWT1G are all ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), meeting environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions.

Q: What is the difference between standard-grade and automotive-grade versions?

A: The SBC856BWT1G carries AEC-Q101 automotive qualification, indicating compliance with automotive industry reliability and quality standards. The BC856BWT1G is standard-grade without automotive qualification. Both meet identical electrical specifications. Automotive-grade selection is required for applications subject to automotive qualification mandates.

Q: Is the SOT-323 package identical across all three parts?

A: Yes. All three parts use the SC-70 / SOT-323 surface mount package with identical pinout and physical dimensions, enabling direct board-level substitution without layout modifications.

Q: What are the key electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: PNP transistor type, 100 mA maximum collector current, 65 V collector-emitter breakdown voltage, 650 mV saturation voltage at specified conditions, 15 nA collector cutoff current, 220 minimum DC current gain at 2 mA and 5 V, 150 mW power dissipation, and 100 MHz transition frequency. All identified substitutes meet these specifications.

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