BC847AT,115 Equivalent & Substitute Parts Reference

Part Overview

The BC847AT,115 is an NPN bipolar junction transistor manufactured by NXP USA Inc., designed for small-signal switching and amplification applications. This 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 obsolete, which necessitates identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	45	V
Collector Current (Max)	100	mA
Transition Frequency	100	MHz
Power Dissipation (Max)	150	mW
DC Current Gain (hFE Min) @ Ic, Vce	110 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 100mA	—
Collector Cutoff Current (Max)	15	nA
Operating Temperature (Max)	150	°C
Package Type	SC-75, SOT-416	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BC847AT,115 is determined by strict equivalence across the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: 45 V (minimum)
Collector current rating: 100 mA (minimum)
Transition frequency: 100 MHz (minimum)
DC current gain (hFE): 110 or greater at specified test conditions
Collector cutoff current: 15 nA or less

Mechanical Compatibility Criteria:

Surface mount mounting type
Package compatibility: SC-75/SOT-416 or alternative surface mount packages (TO-236AB, SOT-23, SOT-323, SOT-523, SOT-883, DFN1006B-3)

Compliance & Certification:

AEC-Q101 automotive qualification (preferred for automotive applications)
ROHS3 compliance
Moisture sensitivity level: 1 (unlimited)

Substitute parts are grouped by package type, as package selection determines PCB layout compatibility. All listed substitutes maintain the core electrical specifications of the BC847AT,115 while offering active product status and improved availability.

Parameter Comparison

Part Number	Manufacturer	Package	Ic (Max) mA	Vce(br) V	Power mW	hFE (Min)	Vce Sat (Max)	Freq MHz	Status	AEC-Q101
BC847AT,115	NXP USA Inc.	SC-75, SOT-416	100	45	150	110	400mV @ 5mA, 100mA	100	Obsolete	Yes
BC847A,215	Nexperia USA Inc.	TO-236AB, SC-59, SOT-23	100	45	250	110	400mV @ 5mA, 100mA	100	Active	Yes
BC847AM,315	Nexperia USA Inc.	SOT-883, SC-101	100	45	250	110	400mV @ 5mA, 100mA	100	Active	Yes
BC847AMB,315	Nexperia USA Inc.	DFN1006B-3, 3-XFDFN	100	45	250	110	200mV @ 500µA, 10mA	100	Active	Yes
BC847AT-TP	Micro Commercial Co	SOT-523	100	45	150	110	600mV @ 5mA, 100mA	100	Active	No
BC847AW,115	NXP Semiconductors	SOT-323, SC-70	100	45	200	110	400mV @ 5mA, 100mA	100	Active	Yes
BC847AWT1G	onsemi	SC-70-3, SOT-323	100	45	150	110	600mV @ 5mA, 100mA	100	Active	No
BC847B-TP	Micro Commercial Co	SOT-23, SC-59, TO-236-3	100	45	225	200	500mV @ 5mA, 100mA	100	Active	No
BC847BT-TP	Micro Commercial Co	SOT-523	100	45	150	200	600mV @ 5mA, 100mA	100	Active	No
BC847BTT1G	onsemi	SC-75, SOT-416	100	45	225	200	600mV @ 5mA, 100mA	100	Active	No
BC847BWT1G	onsemi	SC-70-3, SOT-323	100	45	150	200	600mV @ 5mA, 100mA	100	Active	No

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

BC847A,215 (Nexperia USA Inc., TO-236AB/SOT-23 package) is the primary recommended substitute. This part maintains AEC-Q101 qualification, automotive grade designation, and active product status. The increased power dissipation rating (250 mW vs. 150 mW) provides additional thermal margin. Package change from SC-75 to SOT-23 requires PCB layout modification.

BC847AM,315 (Nexperia USA Inc., SOT-883 package) provides an alternative with AEC-Q101 qualification and active status. The ultra-compact SOT-883 package suits space-constrained applications but requires compatible PCB footprint.

BC847AW,115 (NXP Semiconductors, SOT-323/SC-70 package) maintains AEC-Q101 qualification and active status with compact form factor. Power dissipation of 200 mW exceeds the original 150 mW specification.

For Non-Automotive Applications:

BC847B-TP (Micro Commercial Co, SOT-23 package) offers higher DC current gain (hFE = 200 minimum) and active status. AEC-Q101 qualification is not provided; this part is suitable for consumer and industrial applications only.

BC847BTT1G (onsemi, SC-75/SOT-416 package) maintains the original package footprint with active status. DC current gain is elevated to 200 minimum. AEC-Q101 qualification is not provided.

Package-Specific Considerations:

For direct PCB footprint compatibility without layout redesign, BC847BTT1G (onsemi) maintains the SC-75/SOT-416 package of the original part while providing active product status and improved availability.

For applications permitting package change, SOT-23 variants (BC847A,215 or BC847B-TP) offer the widest availability and lowest cost among active substitutes.

Frequently Asked Questions (FAQ)

Q: Can BC847A,215 directly replace BC847AT,115 without circuit modification?

A: BC847A,215 is electrically equivalent within the specified parameter ranges. However, the package changes from SC-75 (SOT-416) to TO-236AB (SOT-23), requiring PCB footprint modification. Electrical performance remains compatible for all switching and amplification functions.

Q: What is the difference between BC847A and BC847B variants?

A: The primary difference is DC current gain (hFE). BC847A variants specify hFE minimum of 110 at 2 mA, 5 V. BC847B variants specify hFE minimum of 200 at the same test conditions. Both maintain identical voltage and current ratings. BC847B is suitable for applications requiring higher current gain but may exhibit different frequency response characteristics.

Q: Is AEC-Q101 qualification required for my application?

A: AEC-Q101 qualification is mandatory for automotive applications subject to automotive industry standards. For consumer, industrial, or non-automotive applications, AEC-Q101 is not required. Verify application requirements before selecting non-qualified alternatives.

Q: Can I use BC847AMB,315 in place of BC847AT,115?

A: BC847AMB,315 is electrically equivalent with identical voltage and current ratings. The package changes from SC-75 to DFN1006B-3 (ultra-compact 3-pin form factor), requiring PCB redesign. Vce saturation specification differs (200 mV @ 500 µA, 10 mA vs. 400 mV @ 5 mA, 100 mA), reflecting different test conditions rather than functional incompatibility.

Q: What is the impact of power dissipation differences between substitutes?

A: BC847AT,115 is rated at 150 mW maximum power dissipation. Substitutes rated at 200 mW or 250 mW provide additional thermal margin and are directly compatible. Parts rated below 150 mW are not listed as substitutes. Higher power ratings do not degrade performance; they indicate improved thermal capability.

Q: Are there package options smaller than SC-75 for space-constrained designs?

A: Yes. BC847AM,315 (SOT-883) and BC847AMB,315 (DFN1006B-3) provide ultra-compact alternatives. SOT-883 is slightly larger than DFN1006B-3. Both maintain full electrical equivalence and AEC-Q101 qualification (AM,315 variant). PCB layout modification is required for both options.

Q: What is the difference between cut tape, tape & reel, and bulk packaging?

A: Packaging format affects supply chain logistics but not electrical performance. Tape & Reel (TR) is standard for high-volume production. Cut Tape (CT) and Digi-Reel® are suitable for lower volumes. Bulk packaging is used for component kits. All formats contain identical die and electrical specifications.

Q: Can I mix different BC847 variants in the same circuit?

A: Yes, provided the circuit design accommodates the parameter ranges of all variants used. Circuits designed for hFE = 110 minimum will function with hFE = 200 variants, though gain may be higher. Verify saturation voltage specifications (Vce sat) match circuit requirements, as these vary between variants.

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