BC856AT,115 Equivalent & Substitute Parts Reference

Part Overview

The BC856AT,115 is a PNP bipolar junction transistor manufactured by NXP USA Inc., designed for general-purpose switching and amplification applications. This device operates at 65 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and transition frequency of 100 MHz. The part is classified as obsolete, which necessitates identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain electrical compatibility across critical parameters including voltage ratings, current capacity, gain characteristics, and thermal specifications while accommodating different package configurations.

Key Parameters

Parameter	BC856AT,115	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	65	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 100 mA	V
Current - Collector Cutoff (Max)	15	nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	125 @ 2 mA, 5 V	—
Power - Max	150	mW
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-75, SOT-416	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the BC856AT,115 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Transistor Type: PNP configuration
Voltage - Collector Emitter Breakdown (Max): 65 V minimum
Current - Collector (Ic) (Max): 100 mA minimum
DC Current Gain (hFE) (Min) @ Ic, Vce: 125 minimum @ 2 mA, 5 V
Frequency - Transition: 100 MHz minimum
Operating Temperature: 150°C maximum junction temperature
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Package Compatibility Considerations: Substitute parts may employ different surface mount packages (SC-75/SOT-416, TO-236AB/SC-59/SOT-23-3, or SC-70/SOT-323) provided the physical footprint and pin configuration are compatible with the target application's PCB layout and assembly process.

Compliance Requirements: All substitute parts must maintain automotive-grade qualification (AEC-Q101) and ROHS3 compliance to ensure suitability for equivalent application environments.

The three substitute parts listed below satisfy these criteria with variations in power dissipation capability and package form factor.

Parameter Comparison

Parameter	BC856AT,115	BC856A,215	BC856AW,115	BC856BWT1G	Unit
Transistor Type	PNP	PNP	PNP	PNP	—
Voltage - Collector Emitter Breakdown (Max)	65	65	65	65	V
Current - Collector (Ic) (Max)	100	100	100	100	mA
Vce Saturation (Max) @ Ib, Ic	400 @ 5, 100	650 @ 5, 100	600 @ 5, 100	650 @ 5, 100	mV
Current - Collector Cutoff (Max)	15	15	15	15	nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	125 @ 2, 5	125 @ 2, 5	125 @ 2, 5	220 @ 2, 5	—
Power - Max	150	250	200	150	mW
Frequency - Transition	100	100	100	100	MHz
Operating Temperature (TJ)	150	150	150	150	°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	—
Package / Case	SC-75, SOT-416	TO-236-3, SC-59, SOT-23-3	SC-70, SOT-323	SC-70, SOT-323	—
Product Status	Obsolete	Active	Active	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—

Engineering Selection Recommendations

BC856A,215 (Nexperia USA Inc.)

This part is the manufacturer-recommended substitute with active product status. It maintains all critical electrical parameters equivalent to the BC856AT,115 while offering increased power dissipation capability (250 mW versus 150 mW). The TO-236AB package (SC-59/SOT-23-3) provides a standard footprint widely supported in modern PCB assembly processes. Vce saturation is higher at 650 mV, which may affect switching speed in low-voltage applications. This part is suitable for designs where package footprint compatibility with TO-236AB can be accommodated.

BC856AW,115 (Nexperia USA Inc.)

This substitute maintains identical electrical specifications to the BC856AT,115 with equivalent power rating (200 mW). The SOT-323 package (SC-70) offers a smaller footprint than the original SC-75, enabling space-constrained designs. Active product status and AEC-Q101 qualification ensure long-term availability and automotive compliance. Vce saturation at 600 mV represents a mid-range value between the original and BC856A,215. This part is optimal for applications requiring minimal package size while maintaining electrical performance.

BC856BWT1G (onsemi)

This part is manufactured by onsemi and meets all mandatory electrical equivalence criteria. It features the highest DC current gain (220 @ 2 mA, 5 V) among the substitutes, providing enhanced amplification capability. The SC-70-3 package is functionally equivalent to SOT-323. Operating temperature range extends to −55°C, providing broader thermal operating margin. Active product status and ROHS3 compliance confirm suitability. This part is appropriate for applications requiring higher current gain or extended low-temperature operation.

All three substitutes maintain AEC-Q101 automotive qualification and ROHS3 compliance, ensuring compatibility with equivalent application environments and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BC856A,215 be used as a direct replacement for BC856AT,115?

A: BC856A,215 is electrically equivalent across all mandatory parameters (voltage, current, gain, frequency). However, the package differs: BC856A,215 uses TO-236AB (SOT-23-3) while BC856AT,115 uses SC-75 (SOT-416). Direct PCB substitution requires footprint compatibility verification. If the PCB layout accommodates TO-236AB, this part is suitable.

Q: What is the significance of the higher Vce saturation in BC856A,215?

A: BC856A,215 exhibits 650 mV Vce saturation compared to 400 mV in BC856AT,115. This higher saturation voltage results in greater voltage drop across the transistor during saturation, which may reduce switching speed in low-voltage circuits. For applications operating above 5 V, this difference is typically negligible.

Q: Why does BC856BWT1G have a higher DC current gain?

A: BC856BWT1G specifies a minimum hFE of 220 @ 2 mA, 5 V, compared to 125 for the other parts. This reflects manufacturing process variations between onsemi and Nexperia. Higher gain provides greater amplification per unit base current, which may reduce base drive requirements in amplifier circuits.

Q: Are all substitutes suitable for automotive applications?

A: Yes. All three substitute parts carry AEC-Q101 qualification and automotive-grade designation, confirming suitability for automotive environments. They maintain equivalent reliability and qualification standards to the original BC856AT,115.

Q: What is the impact of package selection on circuit performance?

A: Package selection affects PCB layout, assembly process compatibility, and thermal dissipation characteristics. SC-75 (original) and SC-70/SOT-323 (BC856AW,115, BC856BWT1G) are smaller than TO-236AB (BC856A,215). Smaller packages may exhibit slightly higher thermal resistance but occupy less board space. All packages are surface mount and compatible with standard reflow assembly.

Q: Can these parts be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed across all mandatory parameters. Physical interchangeability depends on PCB footprint compatibility. Designs using SC-75 footprints require layout modification to accommodate TO-236AB or SOT-323 packages. Designs with SOT-323 footprints can directly accept BC856AW,115 or BC856BWT1G without modification.

Q: What is the moisture sensitivity implication?

A: All parts, including substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling procedures apply without special dry-pack requirements.

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