BC847BTT1 Equivalent & Substitute Parts

Part Overview

The BC847BTT1 is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal switching and amplification applications. It features a 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 100 MHz transition frequency in a surface mount SC-75 (SOT-416) package. The BC847BTT1 is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives with identical or compatible electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	45	V
Collector Current (Max)	100	mA
DC Current Gain (hFE) @ Ic, Vce	200 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	—
Collector Cutoff Current (Max)	15	nA
Power Dissipation (Max)	225	mW
Transition Frequency	100	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	SC-75, SOT-416	—

Substitute Part Grouping Explanation

Substitution of the BC847BTT1 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Transistor type (NPN)
Collector-emitter breakdown voltage (45 V minimum)
Maximum collector current (100 mA minimum)
DC current gain range (hFE minimum 200 @ 2mA, 5V for direct equivalents; hFE minimum 110 for similar variants)
Vce saturation characteristics
Transition frequency (100 MHz minimum for direct equivalents)
Power dissipation capability (225 mW minimum for direct equivalents)
Operating temperature range (-55°C to 150°C for full compatibility)

Mechanical Compatibility Criteria:

Surface mount mounting type
Package form factor (SC-75/SOT-416 for direct equivalents; SOT-323, SOT-23-3, TO-236AB for package variants)

Compliance Criteria:

RoHS3 compliance status
Moisture sensitivity level (MSL 1 for unlimited shelf life)
Product status (Active preferred; Last Time Buy acceptable with inventory confirmation)

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents: Identical electrical specifications and SC-75/SOT-416 packaging; different packaging format (Cut Tape/Digi-Reel vs. original format)
Upgrade Variants: Identical electrical specifications with alternative surface mount packages (SOT-323, TO-236AB) offering different form factors
Similar Variants: Compatible electrical specifications with minor parameter variations (hFE range, Vce saturation, power dissipation, transition frequency) and alternative packages

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE @ 2mA, 5V	Vce Sat @ 5mA, 100mA	Power mW	Freq MHz	Package	Status	RoHS
BC847BTT1	onsemi	100	45	200	600mV	225	100	SC-75, SOT-416	Obsolete	Non-compliant
BC847BTT1G	onsemi	100	45	200	600mV	225	100	SC-75, SOT-416	Active	ROHS3
BC847BW,115	NXP USA Inc.	100	45	200	400mV	200	100	SC-70, SOT-323	Active	—
BC847BW,135	Nexperia USA Inc.	100	45	200	400mV	200	100	SC-70, SOT-323	Active	ROHS3
BC847A-7-F	Diodes Incorporated	100	45	110	600mV	300	300	TO-236-3, SOT-23-3	Active	ROHS3
BC847AW,115	NXP Semiconductors	100	45	110	400mV	200	100	SC-70, SOT-323	Active	—
BC847AW,135	Nexperia USA Inc.	100	45	110	400mV	200	100	SC-70, SOT-323	Active	ROHS3
BC847B,215	Nexperia USA Inc.	100	45	200	400mV	250	100	TO-236-3, SOT-23-3	Active	ROHS3
BC847B,235	Nexperia USA Inc.	100	45	200	400mV	250	100	TO-236-3, SOT-23-3	Active	ROHS3
BC847B-TP	Micro Commercial Co	100	45	200	500mV	225	100	TO-236-3, SOT-23-3	Active	ROHS3
BC847BE6327HTSA1	Infineon Technologies	100	45	200	600mV	330	250	TO-236-3, SOT-23-3	Last Time Buy	ROHS3

Engineering Selection Recommendations

Direct Replacement (Identical Specifications and Package):

BC847BTT1G (onsemi) is the direct active equivalent to the obsolete BC847BTT1. It maintains identical electrical specifications (100 mA collector current, 45 V breakdown voltage, 200 hFE, 100 MHz transition frequency, 225 mW power dissipation) and SC-75/SOT-416 package form factor. The primary difference is product status (Active vs. Obsolete) and RoHS3 compliance. This part is the preferred replacement for direct substitution without circuit board redesign.

Package-Compatible Alternatives (Identical Electrical Specifications, Alternative Packages):

BC847BW,115 and BC847BW,135 (NXP/Nexperia) provide identical electrical specifications to the main part with transition to SOT-323 packaging. These parts maintain 100 mA collector current, 45 V breakdown voltage, and 200 hFE. The SOT-323 package is smaller than SC-75/SOT-416, requiring PCB layout modification. BC847BW,135 includes RoHS3 compliance and Tape & Reel packaging.

BC847B,215 and BC847B,235 (Nexperia) offer identical electrical specifications with TO-236AB (SOT-23-3) packaging. These parts maintain 100 mA collector current, 45 V breakdown voltage, and 200 hFE with improved power dissipation (250 mW vs. 225 mW). Both include RoHS3 compliance and AEC-Q101 automotive qualification. BC847B,235 is supplied in Tape & Reel format.

BC847B-TP (Micro Commercial Co) provides equivalent specifications in SOT-23 packaging with 225 mW power dissipation, matching the original part's power rating. This part includes RoHS3 compliance and extensive inventory availability.

Functional Alternatives (Compatible Electrical Specifications, Minor Parameter Variations):

BC847A-7-F (Diodes Incorporated) and BC847AW variants (NXP/Nexperia) feature lower DC current gain (110 hFE vs. 200 hFE) but maintain 100 mA collector current and 45 V breakdown voltage. BC847A-7-F offers enhanced transition frequency (300 MHz vs. 100 MHz) and power dissipation (300 mW), with SOT-23-3 packaging. BC847AW,115 and BC847AW,135 provide SOT-323 packaging with 200 mW power dissipation and AEC-Q101 automotive qualification (AW,115) or RoHS3 compliance (AW,135).

BC847BE6327HTSA1 (Infineon) maintains 200 hFE and 100 mA collector current with enhanced transition frequency (250 MHz) and power dissipation (330 mW) in SOT-23 packaging. This part carries Last Time Buy status, indicating limited future availability.

Compliance and Availability Considerations:

All recommended active substitutes include RoHS3 compliance except BC847BW,115 and BC847AW,115, which lack explicit RoHS status documentation. All parts maintain MSL 1 (Unlimited) moisture sensitivity level. Product status is Active for all recommended parts except BC847BE6327HTSA1 (Last Time Buy), which requires inventory confirmation before design commitment.

Frequently Asked Questions (FAQ)

Q: Can BC847BTT1G be used as a direct replacement for BC847BTT1?

A: Yes. BC847BTT1G is the direct active equivalent manufactured by onsemi with identical electrical specifications (100 mA Ic, 45 V Vce(br), 200 hFE, 100 MHz fT, 225 mW power) and SC-75/SOT-416 packaging. No circuit modifications are required. The primary difference is product status (Active vs. Obsolete) and RoHS3 compliance.

Q: What is the difference between BC847BW and BC847B variants?

A: BC847BW variants use SOT-323 (SC-70) packaging, while BC847B variants use TO-236AB (SOT-23-3) packaging. Electrically, both maintain 100 mA collector current, 45 V breakdown voltage, and 200 hFE. The SOT-323 package is smaller, requiring PCB layout modification. The TO-236AB package is larger but more widely used in legacy designs.

Q: Can BC847A variants substitute for BC847B parts?

A: BC847A variants have lower DC current gain (110 hFE vs. 200 hFE) but maintain the same collector current (100 mA) and breakdown voltage (45 V). Substitution is functionally compatible for applications where the lower gain is acceptable. BC847A-7-F offers higher transition frequency (300 MHz vs. 100 MHz), making it suitable for higher-speed applications.

Q: What packaging options are available for BC847 substitutes?

A: Four surface mount packages are available: SC-75/SOT-416 (original, 6-pin), SOT-323 (SC-70, 3-pin), TO-236AB/SOT-23-3 (3-pin), and SOT-23 (3-pin). Package selection depends on PCB layout constraints and available footprints. SC-75/SOT-416 and SOT-23 packages maintain the original 225 mW power rating; SOT-323 and TO-236AB packages offer 200-250 mW ratings.

Q: Are all substitute parts RoHS3 compliant?

A: Most active substitutes include RoHS3 compliance. BC847BW,115 and BC847AW,115 lack explicit RoHS status documentation. BC847BTT1 (original) is RoHS non-compliant. Verify RoHS compliance requirements for your application before final part selection.

Q: What is the difference between Cut Tape and Tape & Reel packaging formats?

A: Cut Tape (CT) and Digi-Reel® format provides individual component strips suitable for manual assembly or small-volume production. Tape & Reel (TR) format provides continuous reels for automated pick-and-place assembly. Both formats contain identical components; packaging format selection depends on assembly process requirements.

Q: Can BC847BE6327HTSA1 be used for new designs?

A: BC847BE6327HTSA1 carries Last Time Buy status, indicating limited future availability. While currently in stock (3,300 pcs), this part is not recommended for new designs. Use active alternatives such as BC847BTT1G, BC847BW,135, or BC847B,235 for long-term design viability.

Q: What is the significance of the hFE parameter in substitution?

A: DC current gain (hFE) determines the base current required to achieve a specified collector current. BC847B variants (hFE 200) require half the base current of BC847A variants (hFE 110) for equivalent collector current. Applications with fixed base current sources require hFE-matched parts. Applications with base current limiting resistors tolerate hFE variation.

Q: Are automotive-qualified variants available?

A: Yes. BC847BW,115, BC847B,215, BC847B,235, and BC847AW,115 include AEC-Q101 automotive qualification. These parts are suitable for automotive and industrial applications requiring qualification documentation.

Q: What is the operating temperature range for substitute parts?

A: BC847BTT1 and BC847B-TP specify -55°C to 150°C operating range. Most other substitutes specify 150°C maximum junction temperature without explicit minimum temperature. Verify operating temperature requirements for your application, particularly for low-temperature environments below -40°C.

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