BC857W-QF Equivalent & Substitute Parts

Part Overview

The BC857W-QF is an active-status PNP bipolar junction transistor manufactured by Nexperia USA Inc., designed for small-signal switching and amplification applications. This surface-mount device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 200 mW power dissipation. The part is packaged in SOT-323 (SC-70) configuration and meets automotive-grade AEC-Q101 qualification standards. Substitute parts are identified based on matching electrical specifications, package compatibility, and compliance 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	600 mV @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min @ Ic, Vce	125 @ 2 mA, 5 V	—
Power - Max	200	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Package / Case	SC-70, SOT-323	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the BC857W-QF are qualified based on the following criteria:

Electrical Parameter Matching:

Transistor type: PNP configuration
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 45 V
Vce saturation: 600 mV @ 5 mA, 100 mA
Collector cutoff current: 15 nA
DC current gain (hFE): 125 minimum @ 2 mA, 5 V
Maximum power dissipation: 200 mW
Transition frequency: 100 MHz
Operating temperature: 150°C

Package Compatibility:

Surface-mount package: SOT-323 (SC-70)

Compliance & Certification:

Automotive grade qualification: AEC-Q101
Product status: Active
RoHS compliance: ROHS3 Compliant

All substitute parts listed maintain identical electrical performance specifications and package form factor, ensuring direct functional replacement without circuit redesign.

Parameter Comparison

Parameter	BC857W-QF (Main)	BC857AW,115	BC857W,115	BC857W,135
Manufacturer	Nexperia USA Inc.	NXP Semiconductors	Nexperia USA Inc.	NXP USA Inc.
Transistor Type	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	15 nA	15 nA	15 nA
DC Current Gain (hFE) Min @ Ic, Vce	125 @ 2 mA, 5 V	125 @ 2 mA, 5 V	125 @ 2 mA, 5 V	125 @ 2 mA, 5 V
Power - Max	200 mW	200 mW	200 mW	200 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	150°C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Grade	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101
Product Status	Active	Active	Active	Active
Packaging Type	Tape & Reel (TR)	Bulk	Cut Tape (CT) & Digi-Reel®	Bulk
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

All three substitute parts—BC857AW,115, BC857W,115, and BC857W,135—are functionally equivalent to the BC857W-QF based on matching electrical specifications and package configuration. Selection among these alternatives is determined by packaging and supply requirements rather than electrical performance.

BC857W,115 is the closest substitute, offering identical electrical parameters, automotive-grade AEC-Q101 qualification, ROHS3 compliance, and active product status. This part differs only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel).

BC857AW,115 provides equivalent electrical performance and AEC-Q101 qualification with bulk packaging. Moisture sensitivity level is rated at 1 (Unlimited) compared to the main part's MSL 3 (168 Hours), indicating superior moisture resistance.

BC857W,135 maintains all electrical specifications and automotive qualification with bulk packaging availability. This variant offers the highest inventory availability among the substitutes.

All substitute parts maintain active product status and automotive-grade qualification, ensuring long-term availability and compliance with automotive supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can BC857AW,115 be used as a direct replacement for BC857W-QF?

A: Yes. BC857AW,115 matches all critical electrical parameters including collector current (100 mA), breakdown voltage (45 V), saturation voltage (600 mV), current gain (125 minimum), power rating (200 mW), and transition frequency (100 MHz). Both parts are packaged in SOT-323 and hold AEC-Q101 automotive qualification.

Q: What is the difference between the packaging options listed?

A: The main part BC857W-QF is supplied in Tape & Reel (TR) format. Substitute BC857W,115 is available in Cut Tape (CT) & Digi-Reel® format. BC857AW,115 and BC857W,135 are supplied in bulk packaging. These differences affect order quantities and handling but do not impact electrical performance or device functionality.

Q: Are all substitute parts RoHS compliant?

A: BC857W-QF and BC857W,115 are explicitly rated ROHS3 Compliant. RoHS status is not specified for BC857AW,115 and BC857W,135 in the provided data.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive-grade qualification standard. All listed parts, including the main part and substitutes, meet this qualification, confirming suitability for automotive applications and compliance with automotive supply chain reliability requirements.

Q: Can I substitute BC857W-QF with BC857W,135 in high-moisture environments?

A: BC857W-QF has a Moisture Sensitivity Level (MSL) of 3 (168 Hours). BC857W,135 MSL rating is not specified in the provided data. For applications with specific moisture sensitivity requirements, verify MSL specifications with the manufacturer before substitution.

Q: Are the electrical characteristics identical across all substitute parts?

A: Yes. All substitute parts maintain identical electrical specifications: 100 mA maximum collector current, 45 V breakdown voltage, 600 mV saturation voltage, 125 minimum current gain, 200 mW power dissipation, and 100 MHz transition frequency. Differences exist only in packaging format and moisture sensitivity ratings.

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