BC857AW-G PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The BC857AW-G is a PNP bipolar junction transistor manufactured by Comchip Technology, designed for general-purpose 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 transition frequency of 100 MHz. The part is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

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 @ 5 mA, 100 mA	—
Current - Collector Cutoff (Max)	15	nA
DC Current Gain (hFE) Min @ Ic, Vce	125 @ 2 mA, 5 V	—
Power - Max	150	mW
Frequency - Transition	100	MHz
Operating Temperature Range	-65 to 150	°C
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC857AW-G is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: PNP
Package / Case: SC-70, SOT-323
Mounting Type: Surface Mount
Voltage - Collector Emitter Breakdown (Max): 45 V
Current - Collector (Ic) Max: 100 mA

Allowable Variation Parameters:

Vce Saturation: Substitute values must not exceed the main part specification under the same test conditions
DC Current Gain (hFE): Substitute values may exceed the main part minimum specification
Power - Max: Substitute values may equal or exceed the main part specification
Frequency - Transition: Substitute values may equal or exceed the main part specification
Operating Temperature Range: Substitute range may be narrower or equal to the main part range
Current - Collector Cutoff (Max): Substitute values may equal or be lower than the main part specification

All identified substitute parts meet these criteria and are classified as Active product status.

Parameter Comparison

Parameter	BC857AW-G (Main)	2PB709ARW,115	AC857CWQ-7	BC857BW,135	BC860BW,135
Manufacturer	Comchip Technology	NXP USA Inc.	Diodes Incorporated	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP
Current - Collector (Ic) Max	100 mA	100 mA	100 mA	100 mA	100 mA
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5 mA, 100 mA	500 mV @ 10 mA, 100 mA	650 mV @ 5 mA, 100 mA	600 mV @ 5 mA, 100 mA	650 mV @ 5 mA, 100 mA
Current - Collector Cutoff (Max)	15 nA	10 nA	15 nA	15 nA	15 nA
DC Current Gain (hFE) Min @ Ic, Vce	125 @ 2 mA, 5 V	210 @ 2 mA, 10 V	420 @ 2 mA, 5 V	220 @ 2 mA, 5 V	220 @ 2 mA, 5 V
Power - Max	150 mW	200 mW	200 mW	200 mW	200 mW
Frequency - Transition	100 MHz	70 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature Range	-65 to 150 °C	Up to 150 °C	-65 to 150 °C	Up to 150 °C	Up to 150 °C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	—	Automotive	Automotive	Automotive	Automotive
Qualification	—	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

BC857AW-G (Main Part): Active product status with standard industrial-grade classification. RoHS3 compliant. Suitable for general-purpose applications where automotive qualification is not required. Operating temperature range extends to -65°C, providing extended low-temperature performance.

2PB709ARW,115 (NXP USA Inc.): Active product status with Automotive grade and AEC-Q101 qualification. Recommended for automotive and mission-critical applications. Vce saturation is improved (500 mV vs. 650 mV), and power dissipation capability is increased to 200 mW. Transition frequency is reduced to 70 MHz; applications requiring 100 MHz operation should verify compatibility. Operating temperature range limited to 150°C maximum.

AC857CWQ-7 (Diodes Incorporated): Active product status with Automotive grade and AEC-Q101 qualification. Maintains 100 MHz transition frequency and full operating temperature range (-65 to 150°C). DC current gain is significantly higher (420 vs. 125), providing improved amplification characteristics. Power dissipation increased to 200 mW. Suitable for automotive applications requiring extended temperature performance.

BC857BW,135 (Nexperia USA Inc.): Active product status with Automotive grade and AEC-Q101 qualification. Maintains 100 MHz transition frequency. Vce saturation slightly improved (600 mV vs. 650 mV). DC current gain increased to 220. Power dissipation increased to 200 mW. Operating temperature range limited to 150°C maximum.

BC860BW,135 (Nexperia USA Inc.): Active product status with Automotive grade and AEC-Q101 qualification. Maintains 100 MHz transition frequency and identical electrical characteristics to BC857BW,135. Base product number differs (BC860 vs. BC857), indicating potential design variant classification. All other parameters equivalent to BC857BW,135.

Frequently Asked Questions (FAQ)

Q: Can BC857AW-G be replaced with 2PB709ARW,115 in all applications?

A: Substitution is valid for applications where transition frequency of 70 MHz is acceptable. The 2PB709ARW,115 operates at lower frequency than the BC857AW-G (70 MHz vs. 100 MHz). Applications requiring 100 MHz operation must use AC857CWQ-7, BC857BW,135, or BC860BW,135. All other electrical parameters are compatible.

Q: What is the difference between BC857BW,135 and BC860BW,135?

A: Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications, operating temperature range, and package type. The primary distinction is the base product number (BC857 vs. BC860). Both are qualified to AEC-Q101 and suitable for automotive applications. Selection between these parts should follow design documentation or supplier availability.

Q: Are all substitute parts RoHS3 compliant?

A: AC857CWQ-7, BC857BW,135, and BC860BW,135 are explicitly RoHS3 compliant. 2PB709ARW,115 does not specify RoHS status in the provided data. Verify RoHS compliance with the supplier if this certification is required for your application.

Q: Can BC857AW-G be used in automotive applications?

A: BC857AW-G is classified as standard industrial-grade and does not carry AEC-Q101 qualification. For automotive applications, use AC857CWQ-7, BC857BW,135, BC860BW,135, or 2PB709ARW,115, all of which are Automotive grade with AEC-Q101 qualification.

Q: What is the impact of different Vce saturation values?

A: Vce saturation determines the voltage drop across the transistor in saturation mode. Lower values (2PB709ARW,115 at 500 mV) result in reduced power dissipation and heat generation. Higher values (BC857AW-G, AC857CWQ-7, BC860BW,135 at 650 mV) are acceptable in most switching applications. Verify saturation voltage requirements in your circuit design before substitution.

Q: Does operating temperature range affect substitution eligibility?

A: BC857AW-G operates from -65°C to 150°C. Substitute parts 2PB709ARW,115, BC857BW,135, and BC860BW,135 are limited to 150°C maximum. AC857CWQ-7 maintains the full -65 to 150°C range. For applications requiring operation below 0°C, use BC857AW-G or AC857CWQ-7.

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use SC-70 / SOT-323 surface mount package, identical to BC857AW-G. No PCB layout modifications are required for substitution.

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