BC856ASQ-7-F Equivalent & Substitute Parts

Part Overview

The BC856ASQ-7-F is a general-purpose dual PNP bipolar junction transistor (BJT) manufactured by Diodes Incorporated in a surface-mount SOT-363 package. This component is classified as an active product and is widely used in analog switching and amplification circuits requiring low-power operation. The device is qualified to AEC-Q101 automotive standards and is RoHS3 compliant. Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for design flexibility, or when enhanced electrical performance characteristics are needed for specific application requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	2 PNP (Dual)	—
Maximum Collector Current (Ic)	100	mA
Collector-Emitter Breakdown Voltage (Max)	65	V
Vce Saturation (Max) @ Ib, Ic	650	mV @ 5mA, 100mA
Collector Cutoff Current (ICBO)	15	nA
DC Current Gain (hFE Min) @ Ic, Vce	125	@ 2mA, 5V
Maximum Power Dissipation	200	mW
Transition Frequency	100	MHz
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-363 (6-TSSOP)	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BC856ASQ-7-F is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Requirements:

Transistor configuration: 2 PNP (Dual) topology
Maximum collector current: 100 mA minimum
Collector-emitter breakdown voltage: 65 V minimum
Transition frequency: 100 MHz minimum
Operating temperature range: -55°C to 150°C minimum
Collector cutoff current: 15 nA maximum

Mechanical Compatibility Requirements:

Surface-mount package: SOT-363, SC-88, or 6-TSSOP (functionally equivalent)
Pinout compatibility within the SOT-363 family

Compliance Requirements:

RoHS3 compliance
Automotive grade qualification (AEC-Q101 or AEC-Q100)
MSL rating of 1 (Unlimited)

Substitute parts listed below meet all electrical and mechanical requirements. Variations in DC current gain (hFE), maximum power dissipation, and Vce saturation voltage are noted but do not preclude substitution when these parameters fall within acceptable design margins.

Parameter Comparison

Parameter	BC856ASQ-7-F (Diodes)	BC856BDW1T1G (onsemi)	BC856BS,115 (Nexperia)	BC856BS,135 (Nexperia)	BC856S,115 (Nexperia)	BC856SF (Nexperia)	BCM856BSH (Nexperia)
Manufacturer	Diodes Inc.	onsemi	Nexperia	Nexperia	Nexperia	Nexperia	Nexperia
Transistor Type	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual)	2 PNP (Dual) Matched Pair
Ic (Max)	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	65 V	65 V	65 V	65 V	65 V	65 V	65 V
Vce Saturation (Max) @ Ib, Ic	650 mV @ 5mA, 100mA	650 mV @ 5mA, 100mA	300 mV @ 5mA, 100mA	300 mV @ 5mA, 100mA	300 mV @ 5mA, 100mA	300 mV @ 5mA, 100mA	400 mV @ 5mA, 100mA
ICBO (Max)	15 nA	15 nA	15 nA	15 nA	15 nA	15 nA	15 nA
hFE (Min) @ Ic, Vce	125 @ 2mA, 5V	220 @ 2mA, 5V	200 @ 2mA, 5V	200 @ 2mA, 5V	110 @ 2mA, 5V	110 @ 2mA, 5V	200 @ 2mA, 5V
Power (Max)	200 mW	380 mW	300 mW	300 mW	300 mW	400 mW	300 mW
Frequency - Transition	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	100 MHz	175 MHz
Operating Temperature	-55 to 150°C	-55 to 150°C	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Package / Case	SOT-363	SC-88/SC70-6/SOT-363	6-TSSOP	6-TSSOP	6-TSSOP	6-TSSOP	6-TSSOP
Grade	Automotive	—	Automotive	Automotive	Automotive	Automotive	Automotive
Qualification	AEC-Q101	—	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q101	AEC-Q100
RoHS Status	ROHS3 Compliant	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)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts maintain active product status and comply with RoHS3 requirements. Selection among substitutes is based on the following engineering criteria:

For Direct Electrical Equivalence: BC856BDW1T1G (onsemi) provides the closest electrical match to the BC856ASQ-7-F, with identical Vce saturation characteristics (650 mV @ 5mA, 100mA) and matching DC current gain specifications. This part is suitable for applications where the original saturation voltage specification is critical. However, this part does not carry automotive grade designation or AEC qualification.

For Automotive Applications: BC856BS,115, BC856BS,135, BC856S,115, BC856SF, and BCM856BSH (all Nexperia) are qualified to automotive standards (AEC-Q101 or AEC-Q100) and maintain the required operating temperature range. These parts feature improved Vce saturation characteristics (300–400 mV), which reduces power dissipation in switching applications. All Nexperia variants are suitable for automotive-grade circuit designs.

For Enhanced Power Dissipation: BC856SF (Nexperia) offers 400 mW maximum power dissipation, providing additional thermal margin compared to the 200 mW rating of the BC856ASQ-7-F. This part is appropriate for applications requiring higher power handling capability.

For Matched Pair Applications: BCM856BSH (Nexperia) is specified as a matched pair with transition frequency of 175 MHz, exceeding the 100 MHz specification of the BC856ASQ-7-F. This part is suitable for precision analog applications requiring matched transistor characteristics.

Frequently Asked Questions (FAQ)

Q: Can BC856BS,115 replace BC856ASQ-7-F in all applications?

A: BC856BS,115 is electrically compatible with BC856ASQ-7-F across all critical parameters: dual PNP configuration, 100 mA collector current, 65 V breakdown voltage, 100 MHz transition frequency, and -55°C to 150°C operating range. The primary difference is improved Vce saturation (300 mV vs. 650 mV), which reduces power dissipation. Both parts are automotive-grade and RoHS3 compliant. Substitution is valid for equivalent circuit operation.

Q: What is the difference between BC856S,115 and BC856BS,115?

A: Both parts are manufactured by Nexperia and share identical electrical specifications: 100 mA Ic, 65 V Vce breakdown, 300 mV saturation voltage, 100 MHz transition frequency, and 300 mW power dissipation. Both are automotive-grade AEC-Q101 qualified and RoHS3 compliant. The designation difference reflects internal Nexperia product line categorization but does not affect functional equivalence.

Q: Is BCM856BSH suitable as a substitute for general-purpose switching applications?

A: BCM856BSH is functionally compatible with BC856ASQ-7-F for general-purpose switching. However, BCM856BSH is specified as a matched pair with tighter DC current gain tolerance and higher transition frequency (175 MHz vs. 100 MHz). This part is optimized for precision analog applications. For standard switching applications, standard BC856 variants (BC856BS,115, BC856S,115, BC856SF) are more cost-effective alternatives.

Q: Does package type affect substitution between SOT-363 and 6-TSSOP?

A: SOT-363 and 6-TSSOP are functionally equivalent surface-mount packages with identical pinout and electrical performance. Both are 6-pin configurations suitable for dual transistor arrays. Substitution between these package designations is valid from an electrical and mechanical standpoint. PCB layout and footprint compatibility must be verified during design integration.

Q: What is the significance of the Vce saturation voltage difference between BC856ASQ-7-F (650 mV) and Nexperia substitutes (300 mV)?

A: Vce saturation voltage determines the voltage drop across the transistor when fully saturated. The BC856ASQ-7-F exhibits 650 mV saturation, while Nexperia BC856 variants exhibit 300 mV saturation. Lower saturation voltage reduces power dissipation in switching circuits and improves efficiency. For applications sensitive to saturation voltage, this difference must be evaluated against circuit design requirements. Both specifications are within acceptable ranges for general-purpose switching applications.

Q: Are all listed substitutes qualified to automotive standards?

A: BC856BDW1T1G (onsemi) does not carry automotive grade designation or AEC qualification. All Nexperia variants (BC856BS,115, BC856BS,135, BC856S,115, BC856SF, BCM856BSH) are automotive-grade and qualified to AEC-Q101 or AEC-Q100. For automotive applications, Nexperia parts are the appropriate substitutes.

Q: Can BC856SF be used in high-temperature applications?

A: BC856SF is rated for -55°C to 150°C operating temperature, matching the BC856ASQ-7-F specification. The 400 mW power dissipation rating provides additional thermal margin compared to the 200 mW rating of the original part. For applications operating near the upper temperature limit, the higher power rating of BC856SF offers improved reliability.

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