BC856S-TP Equivalent & Substitute Parts

Part Overview

The BC856S-TP is a dual PNP small-signal bipolar junction transistor (BJT) manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This surface-mount device operates at collector currents up to 100mA with a maximum collector-emitter breakdown voltage of 65V and transition frequency of 100MHz. The part is currently in active production status with 3640 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs without functional degradation.

Substiute Parts

BC856S-TP

Micro Commercial CoIn Stock: 3675BC856S-TP Datasheet

Current PartRFQ

BC856ASQ-7-F

Diodes IncorporatedIn Stock: 3461BC856ASQ-7-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BC856S-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Transistor configuration: 2 PNP (Dual) topology
• Maximum collector current: 100mA minimum
• Collector-emitter breakdown voltage: 65V minimum
• Maximum power dissipation: 200mW minimum
• Transition frequency: 100MHz minimum
• Operating temperature range: -55°C to 150°C minimum

Mechanical Equivalence Requirements:

• Package type: SOT-363 (6-TSSOP, SC-88)
• Mounting technology: Surface Mount
• Tape & Reel packaging format

Compliance Requirements:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)

The BC856ASQ-7-F manufactured by Diodes Incorporated meets all electrical and mechanical equivalence criteria and is therefore classified as a direct substitute. Both parts share identical base product designation (BC856) and are pin-compatible within the SOT-363 package footprint.

Parameter Comparison

Engineering Selection Recommendations

BC856S-TP (Primary Selection): The BC856S-TP from Micro Commercial Co is the specified part number and remains the preferred selection when available. This part is in active production with 3640 units currently in stock, ensuring supply continuity and lead-time reliability.

BC856ASQ-7-F (Substitute Selection): The BC856ASQ-7-F from Diodes Incorporated is a qualified substitute when BC856S-TP availability is constrained. This part meets all electrical and mechanical equivalence criteria and maintains ROHS3 compliance and MSL-1 rating. The BC856ASQ-7-F carries AEC-Q101 automotive qualification, which provides additional reliability assurance for applications requiring automotive-grade components. The substitute part exhibits higher DC current gain (125 vs. 110 minimum) and higher Vce saturation voltage (650mV vs. 300mV), both of which remain within acceptable operating margins for general-purpose switching and amplification circuits.

Both parts are active production items with adequate inventory levels and are suitable for direct PCB footprint replacement without design modification.

Frequently Asked Questions (FAQ)

Q: Can BC856ASQ-7-F replace BC856S-TP in existing designs without PCB modification?

A: Yes. Both parts use identical SOT-363 package geometry (6-TSSOP, SC-88) with matching pin assignments. Direct footprint substitution is possible without PCB layout changes.

Q: What is the significance of the higher Vce saturation voltage in BC856ASQ-7-F?

A: The BC856ASQ-7-F exhibits 650mV saturation voltage compared to 300mV in BC856S-TP at the same bias conditions (5mA base current, 100mA collector current). This difference affects switching speed and power dissipation in saturation-mode applications. For linear amplification and high-frequency switching circuits, this parameter difference is typically non-critical. Applications requiring minimum saturation voltage should retain BC856S-TP.

Q: Are there temperature or environmental differences between these parts?

A: Both parts operate across the identical temperature range (-55°C to 150°C junction temperature) and share equivalent moisture sensitivity ratings (MSL-1, Unlimited). Environmental performance is equivalent.

Q: What does AEC-Q101 qualification on BC856ASQ-7-F indicate?

A: AEC-Q101 is an automotive industry qualification standard. The BC856ASQ-7-F meets automotive-grade reliability and testing requirements. This qualification is beneficial for applications requiring enhanced reliability assurance but does not affect functional compatibility with non-automotive circuits.

Q: Are both parts RoHS compliant?

A: Yes. Both BC856S-TP and BC856ASQ-7-F are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the base product number relationship?

A: Both parts share the base product number BC856, indicating they are variants within the same product family. The suffix designations (S-TP and ASQ-7-F) identify specific manufacturer implementations and packaging configurations.