BC856BT,115 Equivalent & Substitute Parts

Part Overview

The BC856BT,115 is a PNP bipolar junction transistor manufactured by NXP USA Inc., designed for surface mount applications in the SC-75 package. This component operates at 65 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 150 mW power dissipation. The part is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and maintenance applications. Substitute parts must preserve the core electrical characteristics while accommodating different package formats and manufacturer specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	65	V
DC Current Gain (hFE Min) @ Ic, Vce	220 @ 2mA, 5V	—
Collector Cutoff Current (Max)	15	nA
Power Dissipation (Max)	150	mW
Transition Frequency	100	MHz
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
AEC-Q101 Qualification	Yes	—

Substitute Part Grouping Explanation

Substitution of the BC856BT,115 is determined by strict adherence to the following electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Collector current rating must be ≥100 mA
Collector-emitter breakdown voltage must be ≥65 V
DC current gain (hFE) minimum must be ≥220 @ 2mA, 5V
Collector cutoff current must be ≤15 nA
Transition frequency must be ≥100 MHz
Power dissipation must support the application requirements

Mechanical Compatibility Criteria:

Surface mount mounting type
Package footprint compatibility with SC-75, TO-236-3, SC-59, or SOT-23-3 variants
RoHS3 compliance required
Moisture sensitivity level MSL 1 (Unlimited)

Compliance Requirements:

REACH Unaffected status
ECCN EAR99 classification
Active product status preferred for long-term availability

All five substitute parts listed meet these criteria while offering variations in package format, power rating, and frequency response that may benefit specific application requirements.

Parameter Comparison

Parameter	BC856BT,115 (Main)	BC856B,215	BC856B-TP	BC856BT TR PBFREE	BC856BW,115	BC856BWT1G
Manufacturer	NXP USA Inc.	Nexperia USA Inc.	Micro Commercial Co	Central Semiconductor Corp	Nexperia USA Inc.	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	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
hFE (Min) @ Ic, Vce	220 @ 2mA, 5V	220 @ 2mA, 5V	220 @ 2mA, 5V	220 @ 2mA, 5V	220 @ 2mA, 5V	220 @ 2mA, 5V
Icbo (Max)	15 nA	15 nA	15 nA	15 nA	15 nA	15 nA
Power (Max)	150 mW	250 mW	310 mW	250 mW	200 mW	150 mW
Frequency - Transition	100 MHz	100 MHz	200 MHz	100 MHz	100 MHz	100 MHz
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	SC-75, SOT-416	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	SC-89, SOT-490	SC-70, SOT-323	SC-70, SOT-323
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101	Yes	Yes	Not specified	Not specified	Yes	Not specified
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes for Automotive Applications:

BC856B,215 and BC856BW,115 are recommended as primary substitutes for applications requiring AEC-Q101 qualification. Both parts maintain active product status with Nexperia USA Inc., ensuring long-term availability and supply chain stability. BC856B,215 offers increased power dissipation (250 mW) in a TO-236-3 package, suitable for applications with higher thermal requirements. BC856BW,115 provides the same power rating (200 mW) in a more compact SC-70 package, maintaining automotive-grade qualification.

Secondary Substitutes for General Applications:

BC856B-TP from Micro Commercial Co provides enhanced transition frequency (200 MHz) with 310 mW power dissipation in SOT-23 package, beneficial for higher-speed switching applications. BC856BT TR PBFREE from Central Semiconductor Corp offers extended operating temperature range (-65°C to 150°C) in SOT-523 package for extreme environment applications. BC856BWT1G from onsemi matches the original 150 mW power rating in SC-70 package with extended temperature range.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, ensuring regulatory compatibility. Parts with AEC-Q101 qualification (BC856B,215 and BC856BW,115) are preferred for automotive and mission-critical applications. MSL 1 rating across all parts eliminates moisture sensitivity concerns for standard storage and handling.

Frequently Asked Questions (FAQ)

Q: Can BC856B,215 directly replace BC856BT,115 in existing designs?

A: BC856B,215 is electrically compatible as a substitute. Both parts share identical electrical specifications: 100 mA collector current, 65 V breakdown voltage, 220 hFE minimum, and 100 MHz transition frequency. The primary difference is package format (TO-236-3 versus SC-75) and increased power rating (250 mW versus 150 mW). PCB layout modification is required to accommodate the different package footprint.

Q: What is the advantage of BC856B-TP over the original BC856BT,115?

A: BC856B-TP provides doubled transition frequency (200 MHz versus 100 MHz) and significantly higher power dissipation (310 mW versus 150 mW). These enhancements support faster switching applications and higher current pulses. The SOT-23 package is widely available and offers superior thermal characteristics compared to SC-75.

Q: Are all substitute parts suitable for automotive applications?

A: BC856B,215 and BC856BW,115 carry AEC-Q101 qualification and automotive-grade designation, making them suitable for automotive applications. BC856B-TP, BC856BT TR PBFREE, and BC856BWT1G do not specify AEC-Q101 qualification and should be evaluated for automotive use based on specific application requirements and customer qualification procedures.

Q: What package considerations apply when selecting a substitute?

A: The original BC856BT,115 uses SC-75 (SOT-416) package. Substitutes employ different packages: BC856B,215 uses TO-236-3, BC856B-TP uses SOT-23-3, BC856BT TR PBFREE uses SOT-523, BC856BW,115 uses SOT-323, and BC856BWT1G uses SC-70. Each package has distinct footprint dimensions and pin configurations. PCB redesign is necessary when changing packages. Verify land pattern compatibility with your assembly equipment before implementation.

Q: Does the increased power rating of substitute parts affect circuit design?

A: Higher power ratings (250 mW, 310 mW) indicate improved thermal capability but do not require circuit modification if the original design operated within 150 mW limits. Substitutes with higher power ratings provide design margin and improved reliability in thermally constrained environments. No circuit changes are necessary for direct electrical substitution.

Q: How do temperature ranges differ among substitute options?

A: BC856BT,115 and most substitutes specify maximum operating temperature of 150°C. BC856B-TP and BC856BT TR PBFREE extend the minimum operating temperature to -55°C and -65°C respectively, enabling operation in extreme cold environments. Standard applications at 150°C maximum require no temperature-related modifications.

Q: What is the significance of MSL 1 (Unlimited) rating across all parts?

A: MSL 1 classification indicates unlimited shelf life without moisture baking requirements. All listed parts, including the original BC856BT,115 and all substitutes, can be stored indefinitely under standard warehouse conditions without special moisture control procedures. This eliminates moisture sensitivity as a selection criterion.

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